mirror of https://github.com/anoshenko/rui.git
1020 lines
38 KiB
Go
1020 lines
38 KiB
Go
package rui
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import (
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"fmt"
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"strconv"
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"strings"
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)
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const (
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// MiterJoin - Connected segments are joined by extending their outside edges
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// to connect at a single point, with the effect of filling an additional
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// lozenge-shaped area. This setting is affected by the miterLimit property
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MiterJoin = 0
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// RoundJoin - rounds off the corners of a shape by filling an additional sector
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// of disc centered at the common endpoint of connected segments.
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// The radius for these rounded corners is equal to the line width.
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RoundJoin = 1
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// BevelJoin - Fills an additional triangular area between the common endpoint
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// of connected segments, and the separate outside rectangular corners of each segment.
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BevelJoin = 2
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// ButtCap - the ends of lines are squared off at the endpoints. Default value.
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ButtCap = 0
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// RoundCap - the ends of lines are rounded.
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RoundCap = 1
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// SquareCap - the ends of lines are squared off by adding a box with an equal width
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// and half the height of the line's thickness.
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SquareCap = 2
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// AlphabeticBaseline - the text baseline is the normal alphabetic baseline. Default value.
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AlphabeticBaseline = 0
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// TopBaseline - the text baseline is the top of the em square.
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TopBaseline = 1
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// MiddleBaseline - the text baseline is the middle of the em square.
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MiddleBaseline = 2
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// BottomBaseline - the text baseline is the bottom of the bounding box.
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// This differs from the ideographic baseline in that the ideographic baseline doesn't consider descenders.
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BottomBaseline = 3
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// HangingBaseline - the text baseline is the hanging baseline. (Used by Tibetan and other Indic scripts.)
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HangingBaseline = 4
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// IdeographicBaseline - the text baseline is the ideographic baseline; this is
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// the bottom of the body of the characters, if the main body of characters protrudes
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// beneath the alphabetic baseline. (Used by Chinese, Japanese, and Korean scripts.)
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IdeographicBaseline = 5
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// StartAlign - the text is aligned at the normal start of the line (left-aligned
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// for left-to-right locales, right-aligned for right-to-left locales).
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StartAlign = 3
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// EndAlign - the text is aligned at the normal end of the line (right-aligned
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// for left-to-right locales, left-aligned for right-to-left locales).
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EndAlign = 4
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)
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// GradientPoint defined by an offset and a color, to a linear or radial gradient
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type GradientPoint struct {
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// Offset - a number between 0 and 1, inclusive, representing the position of the color stop
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Offset float64
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// Color - the color of the stop
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Color Color
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}
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// FontParams defined optionally font properties
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type FontParams struct {
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// Italic - if true then a font is italic
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Italic bool
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// SmallCaps - if true then a font uses small-caps glyphs
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SmallCaps bool
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// Weight - a font weight. Valid values: 0...9, there
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// 0 - a weight does not specify;
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// 1 - a minimal weight;
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// 4 - a normal weight;
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// 7 - a bold weight;
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// 9 - a maximal weight.
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Weight int
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// LineHeight - the height (relative to the font size of the element itself) of a line box.
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LineHeight SizeUnit
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}
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// Canvas is a drawing interface
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type Canvas interface {
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// View return the view for the drawing
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View() CanvasView
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// Width returns the width in pixels of the canvas area
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Width() float64
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// Height returns the height in pixels of the canvas area
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Height() float64
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// Save saves the entire state of the canvas by pushing the current state onto a stack.
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Save()
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// Restore restores the most recently saved canvas state by popping the top entry
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// in the drawing state stack. If there is no saved state, this method does nothing.
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Restore()
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// ClipPath turns the rectangle into the current clipping region. It replaces any previous clipping region.
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ClipRect(x, y, width, height float64)
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// ClipPath turns the path into the current clipping region. It replaces any previous clipping region.
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ClipPath(path Path)
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// SetScale adds a scaling transformation to the canvas units horizontally and/or vertically.
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// x - scaling factor in the horizontal direction. A negative value flips pixels across
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// the vertical axis. A value of 1 results in no horizontal scaling;
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// y - scaling factor in the vertical direction. A negative value flips pixels across
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// the horizontal axis. A value of 1 results in no vertical scaling.
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SetScale(x, y float64)
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// SetTranslation adds a translation transformation to the current matrix.
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// x - distance to move in the horizontal direction. Positive values are to the right, and negative to the left;
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// y - distance to move in the vertical direction. Positive values are down, and negative are up.
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SetTranslation(x, y float64)
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// SetRotation adds a rotation to the transformation matrix.
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// angle - the rotation angle, clockwise in radians
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SetRotation(angle float64)
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// SetTransformation multiplies the current transformation with the matrix described by the arguments
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// of this method. This lets you scale, rotate, translate (move), and skew the context.
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// The transformation matrix is described by:
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// ⎡ xScale xSkew dx ⎤
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// ⎢ ySkew yScale dy ⎥
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// ⎣ 0 0 1 ⎦
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// xScale, yScale - horizontal and vertical scaling. A value of 1 results in no scaling;
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// xSkew, ySkew - horizontal and vertical skewing;
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// dx, dy - horizontal and vertical translation (moving).
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SetTransformation(xScale, yScale, xSkew, ySkew, dx, dy float64)
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// ResetTransformation resets the current transform to the identity matrix
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ResetTransformation()
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// SetSolidColorFillStyle sets the color to use inside shapes
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SetSolidColorFillStyle(color Color)
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// SetSolidColorStrokeStyle sets color to use for the strokes (outlines) around shapes
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SetSolidColorStrokeStyle(color Color)
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// SetLinearGradientFillStyle sets a gradient along the line connecting two given coordinates to use inside shapes
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// x0, y0 - coordinates of the start point;
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// x1, y1 - coordinates of the end point;
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// startColor, endColor - the start and end color
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// stopPoints - the array of stop points
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SetLinearGradientFillStyle(x0, y0 float64, color0 Color, x1, y1 float64, color1 Color, stopPoints []GradientPoint)
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// SetLinearGradientStrokeStyle sets a gradient along the line connecting two given coordinates to use for the strokes (outlines) around shapes
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// x0, y0 - coordinates of the start point;
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// x1, y1 - coordinates of the end point;
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// color0, color1 - the start and end color
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// stopPoints - the array of stop points
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SetLinearGradientStrokeStyle(x0, y0 float64, color0 Color, x1, y1 float64, color1 Color, stopPoints []GradientPoint)
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// SetRadialGradientFillStyle sets a radial gradient using the size and coordinates of two circles
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// to use inside shapes
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// x0, y0 - coordinates of the center of the start circle;
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// r0 - the radius of the start circle;
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// x1, y1 - coordinates the center of the end circle;
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// r1 - the radius of the end circle;
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// color0, color1 - the start and end color
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// stopPoints - the array of stop points
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SetRadialGradientFillStyle(x0, y0, r0 float64, color0 Color, x1, y1, r1 float64, color1 Color, stopPoints []GradientPoint)
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// SetRadialGradientStrokeStyle sets a radial gradient using the size and coordinates of two circles
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// to use for the strokes (outlines) around shapes
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// x0, y0 - coordinates of the center of the start circle;
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// r0 - the radius of the start circle;
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// x1, y1 - coordinates the center of the end circle;
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// r1 - the radius of the end circle;
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// color0, color1 - the start and end color
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// stopPoints - the array of stop points
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SetRadialGradientStrokeStyle(x0, y0, r0 float64, color0 Color, x1, y1, r1 float64, color1 Color, stopPoints []GradientPoint)
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// SetImageFillStyle set the image as the filling pattern.
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// repeate - indicating how to repeat the pattern's image. Possible values are:
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// NoRepeat (0) - neither direction,
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// RepeatXY (1) - both directions,
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// RepeatX (2) - horizontal only,
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// RepeatY (3) - vertical only.
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SetImageFillStyle(image Image, repeat int)
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// SetLineWidth the line width, in coordinate space units. Zero, negative, Infinity, and NaN values are ignored.
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SetLineWidth(width float64)
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// SetLineJoin sets the shape used to join two line segments where they meet.
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// Valid values: MiterJoin (0), RoundJoin (1), BevelJoin (2). All other values are ignored.
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SetLineJoin(join int)
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// SetLineJoin sets the shape used to draw the end points of lines.
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// Valid values: ButtCap (0), RoundCap (1), SquareCap (2). All other values are ignored.
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SetLineCap(cap int)
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// SetLineDash sets the line dash pattern used when stroking lines.
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// dash - an array of values that specify alternating lengths of lines and gaps which describe the pattern.
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// offset - the line dash offset
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SetLineDash(dash []float64, offset float64)
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// SetFont sets the current text style to use when drawing text
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SetFont(name string, size SizeUnit)
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// SetFontWithParams sets the current text style to use when drawing text
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SetFontWithParams(name string, size SizeUnit, params FontParams)
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// TextWidth calculates the width of the text drawn by a given font
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TextWidth(text string, fontName string, fontSize SizeUnit) float64
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// SetTextBaseline sets the current text baseline used when drawing text. Valid values:
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// AlphabeticBaseline (0), TopBaseline (1), MiddleBaseline (2), BottomBaseline (3),
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// HangingBaseline (4), and IdeographicBaseline (5). All other values are ignored.
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SetTextBaseline(baseline int)
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// SetTextAlign sets the current text alignment used when drawing text. Valid values:
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// LeftAlign (0), RightAlign (1), CenterAlign (2), StartAlign (3), and EndAlign(4). All other values are ignored.
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SetTextAlign(align int)
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// SetShadow sets shadow parameters:
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// offsetX, offsetY - the distance that shadows will be offset horizontally and vertically;
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// blur - the amount of blur applied to shadows. Must be non-negative;
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// color - the color of shadows.
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SetShadow(offsetX, offsetY, blur float64, color Color)
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// ResetShadow sets shadow parameters to default values (invisible shadow)
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ResetShadow()
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// ClearRect erases the pixels in a rectangular area by setting them to transparent black
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ClearRect(x, y, width, height float64)
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// FillRect draws a rectangle that is filled according to the current FillStyle.
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FillRect(x, y, width, height float64)
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// StrokeRect draws a rectangle that is stroked (outlined) according to the current strokeStyle
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// and other context settings
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StrokeRect(x, y, width, height float64)
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// FillAndStrokeRect draws a rectangle that is filled according to the current FillStyle and
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// is stroked (outlined) according to the current strokeStyle and other context settings
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FillAndStrokeRect(x, y, width, height float64)
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// FillRoundedRect draws a rounded rectangle that is filled according to the current FillStyle.
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FillRoundedRect(x, y, width, height, r float64)
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// StrokeRoundedRect draws a rounded rectangle that is stroked (outlined) according
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// to the current strokeStyle and other context settings
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StrokeRoundedRect(x, y, width, height, r float64)
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// FillAndStrokeRoundedRect draws a rounded rectangle that is filled according to the current FillStyle
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// and is stroked (outlined) according to the current strokeStyle and other context settings
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FillAndStrokeRoundedRect(x, y, width, height, r float64)
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// FillEllipse draws a ellipse that is filled according to the current FillStyle.
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// x, y - coordinates of the ellipse's center;
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// radiusX - the ellipse's major-axis radius. Must be non-negative;
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// radiusY - the ellipse's minor-axis radius. Must be non-negative;
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// rotation - the rotation of the ellipse, expressed in radians.
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FillEllipse(x, y, radiusX, radiusY, rotation float64)
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// StrokeRoundedRect draws a ellipse that is stroked (outlined) according
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// to the current strokeStyle and other context settings
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StrokeEllipse(x, y, radiusX, radiusY, rotation float64)
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// FillAndStrokeEllipse draws a ellipse that is filled according to the current FillStyle
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// and is stroked (outlined) according to the current strokeStyle and other context settings
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FillAndStrokeEllipse(x, y, radiusX, radiusY, rotation float64)
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// FillPath draws a path that is filled according to the current FillStyle.
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FillPath(path Path)
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// StrokePath draws a path that is stroked (outlined) according to the current strokeStyle
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// and other context settings
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StrokePath(path Path)
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// FillAndStrokeRect draws a path that is filled according to the current FillStyle and
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// is stroked (outlined) according to the current strokeStyle and other context settings
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FillAndStrokePath(path Path)
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// DrawLine draws a line according to the current strokeStyle and other context settings
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DrawLine(x0, y0, x1, y1 float64)
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// FillText draws a text string at the specified coordinates, filling the string's characters
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// with the current FillStyle
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FillText(x, y float64, text string)
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// StrokeText strokes — that is, draws the outlines of — the characters of a text string
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// at the specified coordinates
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StrokeText(x, y float64, text string)
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// DrawImage draws the image at the (x, y) position
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DrawImage(x, y float64, image Image)
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// DrawImageInRect draws the image in the rectangle (x, y, width, height), scaling in height and width if necessary
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DrawImageInRect(x, y, width, height float64, image Image)
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// DrawImageFragment draws the frament (described by srcX, srcY, srcWidth, srcHeight) of image
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// in the rectangle (dstX, dstY, dstWidth, dstHeight), scaling in height and width if necessary
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DrawImageFragment(srcX, srcY, srcWidth, srcHeight, dstX, dstY, dstWidth, dstHeight float64, image Image)
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finishDraw() string
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}
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type canvasData struct {
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view CanvasView
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script strings.Builder
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}
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func newCanvas(view CanvasView) Canvas {
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canvas := new(canvasData)
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canvas.view = view
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canvas.script.Grow(4096)
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canvas.script.WriteString(`const canvas = document.getElementById('`)
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canvas.script.WriteString(view.htmlID())
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canvas.script.WriteString(`');
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const ctx = canvas.getContext('2d');
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const dpr = window.devicePixelRatio || 1;
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var gradient;
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var path;
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var img;
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ctx.canvas.width = dpr * canvas.clientWidth;
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ctx.canvas.height = dpr * canvas.clientHeight;
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ctx.scale(dpr, dpr);`)
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/*
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canvas.script.WriteString(strconv.FormatFloat(view.canvasWidth(), 'g', -1, 64))
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canvas.script.WriteString(`;
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ctx.canvas.height = dpr * `)
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canvas.script.WriteString(strconv.FormatFloat(view.canvasHeight(), 'g', -1, 64))
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canvas.script.WriteString(";\nctx.scale(dpr, dpr);")
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*/
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return canvas
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}
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func (canvas *canvasData) finishDraw() string {
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canvas.script.WriteString("\n")
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return canvas.script.String()
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}
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func (canvas *canvasData) View() CanvasView {
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return canvas.view
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}
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func (canvas *canvasData) Width() float64 {
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if canvas.view != nil {
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return canvas.view.Frame().Width
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}
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return 0
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}
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func (canvas *canvasData) Height() float64 {
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if canvas.view != nil {
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return canvas.view.Frame().Height
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}
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return 0
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}
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func (canvas *canvasData) Save() {
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canvas.script.WriteString("\nctx.save();")
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}
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func (canvas *canvasData) Restore() {
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canvas.script.WriteString("\nctx.restore();")
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}
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func (canvas *canvasData) ClipRect(x, y, width, height float64) {
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canvas.script.WriteString("\nctx.beginPath();\nctx.rect(")
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canvas.script.WriteString(strconv.FormatFloat(x, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(y, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(width, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(height, 'g', -1, 64))
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canvas.script.WriteString(");\nctx.clip();")
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}
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func (canvas *canvasData) ClipPath(path Path) {
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canvas.script.WriteString(path.scriptText())
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canvas.script.WriteString("\nctx.clip();")
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}
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func (canvas *canvasData) SetScale(x, y float64) {
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canvas.script.WriteString("\nctx.scale(")
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canvas.script.WriteString(strconv.FormatFloat(x, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(y, 'g', -1, 64))
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canvas.script.WriteString(");")
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}
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func (canvas *canvasData) SetTranslation(x, y float64) {
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canvas.script.WriteString("\nctx.translate(")
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canvas.script.WriteString(strconv.FormatFloat(x, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(y, 'g', -1, 64))
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canvas.script.WriteString(");")
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}
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func (canvas *canvasData) SetRotation(angle float64) {
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canvas.script.WriteString("\nctx.rotate(")
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canvas.script.WriteString(strconv.FormatFloat(angle, 'g', -1, 64))
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canvas.script.WriteString(");")
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}
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func (canvas *canvasData) SetTransformation(xScale, yScale, xSkew, ySkew, dx, dy float64) {
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canvas.script.WriteString("\nctx.transform(")
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canvas.script.WriteString(strconv.FormatFloat(xScale, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(ySkew, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(xSkew, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(yScale, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(dx, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(dy, 'g', -1, 64))
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canvas.script.WriteString(");")
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}
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func (canvas *canvasData) ResetTransformation() {
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canvas.script.WriteString("\nctx.resetTransform();\nctx.scale(dpr, dpr);")
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}
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func (canvas *canvasData) SetSolidColorFillStyle(color Color) {
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canvas.script.WriteString("\nctx.fillStyle = \"")
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canvas.script.WriteString(color.cssString())
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canvas.script.WriteString(`";`)
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}
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func (canvas *canvasData) SetSolidColorStrokeStyle(color Color) {
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canvas.script.WriteString("\nctx.strokeStyle = \"")
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canvas.script.WriteString(color.cssString())
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canvas.script.WriteString(`";`)
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}
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func (canvas *canvasData) setLinearGradient(x0, y0 float64, color0 Color, x1, y1 float64, color1 Color, stopPoints []GradientPoint) {
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canvas.script.WriteString("\ngradient = ctx.createLinearGradient(")
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canvas.script.WriteString(strconv.FormatFloat(x0, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(y0, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(x1, 'g', -1, 64))
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canvas.script.WriteRune(',')
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canvas.script.WriteString(strconv.FormatFloat(y1, 'g', -1, 64))
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canvas.script.WriteString(");\ngradient.addColorStop(0, '")
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canvas.script.WriteString(color0.cssString())
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canvas.script.WriteString("');")
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for _, point := range stopPoints {
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if point.Offset >= 0 && point.Offset <= 1 {
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canvas.script.WriteString("\ngradient.addColorStop(")
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canvas.script.WriteString(strconv.FormatFloat(point.Offset, 'g', -1, 64))
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canvas.script.WriteString(", '")
|
|
canvas.script.WriteString(point.Color.cssString())
|
|
canvas.script.WriteString("');")
|
|
}
|
|
}
|
|
|
|
canvas.script.WriteString("\ngradient.addColorStop(1, '")
|
|
canvas.script.WriteString(color1.cssString())
|
|
canvas.script.WriteString("');")
|
|
}
|
|
|
|
func (canvas *canvasData) SetLinearGradientFillStyle(x0, y0 float64, color0 Color, x1, y1 float64, color1 Color, stopPoints []GradientPoint) {
|
|
canvas.setLinearGradient(x0, y0, color0, x1, y1, color1, stopPoints)
|
|
canvas.script.WriteString("\nctx.fillStyle = gradient;")
|
|
}
|
|
|
|
func (canvas *canvasData) SetLinearGradientStrokeStyle(x0, y0 float64, color0 Color, x1, y1 float64, color1 Color, stopPoints []GradientPoint) {
|
|
canvas.setLinearGradient(x0, y0, color0, x1, y1, color1, stopPoints)
|
|
canvas.script.WriteString("\nctx.strokeStyle = gradient;")
|
|
}
|
|
|
|
func (canvas *canvasData) setRadialGradient(x0, y0, r0 float64, color0 Color, x1, y1, r1 float64, color1 Color, stopPoints []GradientPoint) {
|
|
canvas.script.WriteString("\ngradient = ctx.createRadialGradient(")
|
|
canvas.script.WriteString(strconv.FormatFloat(x0, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(y0, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(r0, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(x1, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(y1, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(r1, 'g', -1, 64))
|
|
canvas.script.WriteString(");\ngradient.addColorStop(0, '")
|
|
canvas.script.WriteString(color0.cssString())
|
|
canvas.script.WriteString("');")
|
|
|
|
for _, point := range stopPoints {
|
|
if point.Offset >= 0 && point.Offset <= 1 {
|
|
canvas.script.WriteString("\ngradient.addColorStop(")
|
|
canvas.script.WriteString(strconv.FormatFloat(point.Offset, 'g', -1, 64))
|
|
canvas.script.WriteString(", '")
|
|
canvas.script.WriteString(point.Color.cssString())
|
|
canvas.script.WriteString("');")
|
|
}
|
|
}
|
|
|
|
canvas.script.WriteString("\ngradient.addColorStop(1, '")
|
|
canvas.script.WriteString(color1.cssString())
|
|
canvas.script.WriteString("');")
|
|
}
|
|
|
|
func (canvas *canvasData) SetRadialGradientFillStyle(x0, y0, r0 float64, color0 Color, x1, y1, r1 float64, color1 Color, stopPoints []GradientPoint) {
|
|
canvas.setRadialGradient(x0, y0, r0, color0, x1, y1, r1, color1, stopPoints)
|
|
canvas.script.WriteString("\nctx.fillStyle = gradient;")
|
|
}
|
|
|
|
func (canvas *canvasData) SetRadialGradientStrokeStyle(x0, y0, r0 float64, color0 Color, x1, y1, r1 float64, color1 Color, stopPoints []GradientPoint) {
|
|
canvas.setRadialGradient(x0, y0, r0, color0, x1, y1, r1, color1, stopPoints)
|
|
canvas.script.WriteString("\nctx.strokeStyle = gradient;")
|
|
}
|
|
|
|
func (canvas *canvasData) SetImageFillStyle(image Image, repeat int) {
|
|
if image == nil || image.LoadingStatus() != ImageReady {
|
|
return
|
|
}
|
|
|
|
var repeatText string
|
|
switch repeat {
|
|
case NoRepeat:
|
|
repeatText = "no-repeat"
|
|
|
|
case RepeatXY:
|
|
repeatText = "repeat"
|
|
|
|
case RepeatX:
|
|
repeatText = "repeat-x"
|
|
|
|
case RepeatY:
|
|
repeatText = "repeat-y"
|
|
|
|
default:
|
|
return
|
|
}
|
|
|
|
canvas.script.WriteString("\nimg = images.get('")
|
|
canvas.script.WriteString(image.URL())
|
|
canvas.script.WriteString("');\nif (img) {\nctx.fillStyle = ctx.createPattern(img,'")
|
|
canvas.script.WriteString(repeatText)
|
|
canvas.script.WriteString("');\n}")
|
|
}
|
|
|
|
func (canvas *canvasData) SetLineWidth(width float64) {
|
|
if width > 0 {
|
|
canvas.script.WriteString("\nctx.lineWidth = '")
|
|
canvas.script.WriteString(strconv.FormatFloat(width, 'g', -1, 64))
|
|
canvas.script.WriteString("';")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) SetLineJoin(join int) {
|
|
switch join {
|
|
case MiterJoin:
|
|
canvas.script.WriteString("\nctx.lineJoin = 'miter';")
|
|
|
|
case RoundJoin:
|
|
canvas.script.WriteString("\nctx.lineJoin = 'round';")
|
|
|
|
case BevelJoin:
|
|
canvas.script.WriteString("\nctx.lineJoin = 'bevel';")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) SetLineCap(cap int) {
|
|
switch cap {
|
|
case ButtCap:
|
|
canvas.script.WriteString("\nctx.lineCap = 'butt';")
|
|
|
|
case RoundCap:
|
|
canvas.script.WriteString("\nctx.lineCap = 'round';")
|
|
|
|
case SquareCap:
|
|
canvas.script.WriteString("\nctx.lineCap = 'square';")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) SetLineDash(dash []float64, offset float64) {
|
|
canvas.script.WriteString("\nctx.setLineDash([")
|
|
for i, d := range dash {
|
|
if i > 0 {
|
|
canvas.script.WriteString(",")
|
|
}
|
|
canvas.script.WriteString(strconv.FormatFloat(d, 'g', -1, 64))
|
|
}
|
|
|
|
canvas.script.WriteString("]);")
|
|
if offset >= 0 {
|
|
canvas.script.WriteString("\nctx.lineDashOffset = '")
|
|
canvas.script.WriteString(strconv.FormatFloat(offset, 'g', -1, 64))
|
|
canvas.script.WriteString("';")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) writeFont(name string, script *strings.Builder) {
|
|
names := strings.Split(name, ",")
|
|
lead := " "
|
|
for _, font := range names {
|
|
font = strings.Trim(font, " \n\"'")
|
|
script.WriteString(lead)
|
|
lead = ","
|
|
if strings.Contains(font, " ") {
|
|
script.WriteRune('"')
|
|
script.WriteString(font)
|
|
script.WriteRune('"')
|
|
} else {
|
|
script.WriteString(font)
|
|
}
|
|
|
|
}
|
|
script.WriteString("';")
|
|
}
|
|
|
|
func (canvas *canvasData) SetFont(name string, size SizeUnit) {
|
|
canvas.script.WriteString("\nctx.font = '")
|
|
canvas.script.WriteString(size.cssString("1em"))
|
|
canvas.writeFont(name, &canvas.script)
|
|
}
|
|
|
|
func (canvas *canvasData) setFontWithParams(name string, size SizeUnit, params FontParams, script *strings.Builder) {
|
|
script.WriteString("\nctx.font = '")
|
|
if params.Italic {
|
|
script.WriteString("italic ")
|
|
}
|
|
if params.SmallCaps {
|
|
script.WriteString("small-caps ")
|
|
}
|
|
if params.Weight > 0 && params.Weight <= 9 {
|
|
switch params.Weight {
|
|
case 4:
|
|
script.WriteString("normal ")
|
|
case 7:
|
|
script.WriteString("bold ")
|
|
default:
|
|
script.WriteString(strconv.Itoa(params.Weight * 100))
|
|
script.WriteRune(' ')
|
|
}
|
|
}
|
|
|
|
script.WriteString(size.cssString("1em"))
|
|
switch params.LineHeight.Type {
|
|
case Auto:
|
|
|
|
case SizeInPercent:
|
|
if params.LineHeight.Value != 100 {
|
|
script.WriteString("/")
|
|
script.WriteString(strconv.FormatFloat(params.LineHeight.Value/100, 'g', -1, 64))
|
|
}
|
|
|
|
case SizeInFraction:
|
|
if params.LineHeight.Value != 1 {
|
|
script.WriteString("/")
|
|
script.WriteString(strconv.FormatFloat(params.LineHeight.Value, 'g', -1, 64))
|
|
}
|
|
|
|
default:
|
|
script.WriteString("/")
|
|
script.WriteString(params.LineHeight.cssString(""))
|
|
}
|
|
|
|
canvas.writeFont(name, script)
|
|
}
|
|
|
|
func (canvas *canvasData) SetFontWithParams(name string, size SizeUnit, params FontParams) {
|
|
canvas.setFontWithParams(name, size, params, &canvas.script)
|
|
}
|
|
|
|
func (canvas *canvasData) TextWidth(text string, fontName string, fontSize SizeUnit) float64 {
|
|
buffer := allocStringBuilder()
|
|
defer freeStringBuilder(buffer)
|
|
|
|
canvas.setFontWithParams(fontName, fontSize, FontParams{}, buffer)
|
|
fontParams := buffer.String()
|
|
|
|
buffer.Reset()
|
|
canvas.writeStringArgs(text, buffer)
|
|
str := buffer.String()
|
|
|
|
script := fmt.Sprintf(`
|
|
var w = 0;
|
|
const canvas = document.getElementById('%s');
|
|
if (canvas) {
|
|
const ctx = canvas.getContext('2d');
|
|
if (ctx) {
|
|
ctx.save()
|
|
const dpr = window.devicePixelRatio || 1;
|
|
ctx.scale(dpr, dpr);
|
|
%s;
|
|
w = ctx.measureText('%s').width;
|
|
ctx.restore();
|
|
}
|
|
}
|
|
sendMessage('answer{width=' + w + ', answerID=' + answerID + '}');
|
|
`, canvas.View().htmlID(), fontParams, str)
|
|
|
|
result := canvas.View().Session().runGetterScript(script)
|
|
switch result.Tag() {
|
|
case "answer":
|
|
if value, ok := result.PropertyValue("width"); ok {
|
|
w, err := strconv.ParseFloat(value, 32)
|
|
if err == nil {
|
|
return w
|
|
}
|
|
ErrorLog(err.Error())
|
|
}
|
|
|
|
case "error":
|
|
if text, ok := result.PropertyValue("errorText"); ok {
|
|
ErrorLog(text)
|
|
} else {
|
|
ErrorLog("error")
|
|
}
|
|
|
|
default:
|
|
ErrorLog("Unknown answer: " + result.Tag())
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
func (canvas *canvasData) SetTextBaseline(baseline int) {
|
|
switch baseline {
|
|
case AlphabeticBaseline:
|
|
canvas.script.WriteString("\nctx.textBaseline = 'alphabetic';")
|
|
case TopBaseline:
|
|
canvas.script.WriteString("\nctx.textBaseline = 'top';")
|
|
case MiddleBaseline:
|
|
canvas.script.WriteString("\nctx.textBaseline = 'middle';")
|
|
case BottomBaseline:
|
|
canvas.script.WriteString("\nctx.textBaseline = 'bottom';")
|
|
case HangingBaseline:
|
|
canvas.script.WriteString("\nctx.textBaseline = 'hanging';")
|
|
case IdeographicBaseline:
|
|
canvas.script.WriteString("\nctx.textBaseline = 'ideographic';")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) SetTextAlign(align int) {
|
|
switch align {
|
|
case LeftAlign:
|
|
canvas.script.WriteString("\nctx.textAlign = 'left';")
|
|
case RightAlign:
|
|
canvas.script.WriteString("\nctx.textAlign = 'right';")
|
|
case CenterAlign:
|
|
canvas.script.WriteString("\nctx.textAlign = 'center';")
|
|
case StartAlign:
|
|
canvas.script.WriteString("\nctx.textAlign = 'start';")
|
|
case EndAlign:
|
|
canvas.script.WriteString("\nctx.textAlign = 'end';")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) SetShadow(offsetX, offsetY, blur float64, color Color) {
|
|
if color.Alpha() > 0 && blur >= 0 {
|
|
canvas.script.WriteString("\nctx.shadowColor = '")
|
|
canvas.script.WriteString(color.cssString())
|
|
canvas.script.WriteString("';\nctx.shadowOffsetX = ")
|
|
canvas.script.WriteString(strconv.FormatFloat(offsetX, 'g', -1, 64))
|
|
canvas.script.WriteString(";\nctx.shadowOffsetY = ")
|
|
canvas.script.WriteString(strconv.FormatFloat(offsetY, 'g', -1, 64))
|
|
canvas.script.WriteString(";\nctx.shadowBlur = ")
|
|
canvas.script.WriteString(strconv.FormatFloat(blur, 'g', -1, 64))
|
|
canvas.script.WriteString(";")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) ResetShadow() {
|
|
canvas.script.WriteString("\nctx.shadowColor = 'rgba(0,0,0,0)';\nctx.shadowOffsetX = 0;\nctx.shadowOffsetY = 0;\nctx.shadowBlur = 0;")
|
|
}
|
|
|
|
func (canvas *canvasData) writeRectArgs(x, y, width, height float64) {
|
|
canvas.script.WriteString(strconv.FormatFloat(x, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(y, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(width, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(height, 'g', -1, 64))
|
|
}
|
|
|
|
func (canvas *canvasData) ClearRect(x, y, width, height float64) {
|
|
canvas.script.WriteString("\nctx.clearRect(")
|
|
canvas.writeRectArgs(x, y, width, height)
|
|
canvas.script.WriteString(");")
|
|
}
|
|
|
|
func (canvas *canvasData) FillRect(x, y, width, height float64) {
|
|
canvas.script.WriteString("\nctx.fillRect(")
|
|
canvas.writeRectArgs(x, y, width, height)
|
|
canvas.script.WriteString(");")
|
|
}
|
|
|
|
func (canvas *canvasData) StrokeRect(x, y, width, height float64) {
|
|
canvas.script.WriteString("\nctx.strokeRect(")
|
|
canvas.writeRectArgs(x, y, width, height)
|
|
canvas.script.WriteString(");")
|
|
}
|
|
|
|
func (canvas *canvasData) FillAndStrokeRect(x, y, width, height float64) {
|
|
canvas.FillRect(x, y, width, height)
|
|
canvas.StrokeRect(x, y, width, height)
|
|
}
|
|
|
|
func (canvas *canvasData) writeRoundedRect(x, y, width, height, r float64) {
|
|
left := strconv.FormatFloat(x, 'g', -1, 64)
|
|
top := strconv.FormatFloat(y, 'g', -1, 64)
|
|
right := strconv.FormatFloat(x+width, 'g', -1, 64)
|
|
bottom := strconv.FormatFloat(y+height, 'g', -1, 64)
|
|
leftR := strconv.FormatFloat(x+r, 'g', -1, 64)
|
|
topR := strconv.FormatFloat(y+r, 'g', -1, 64)
|
|
rightR := strconv.FormatFloat(x+width-r, 'g', -1, 64)
|
|
bottomR := strconv.FormatFloat(y+height-r, 'g', -1, 64)
|
|
radius := strconv.FormatFloat(r, 'g', -1, 64)
|
|
canvas.script.WriteString("\nctx.beginPath();\nctx.moveTo(")
|
|
canvas.script.WriteString(left)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(topR)
|
|
canvas.script.WriteString(");\nctx.arc(")
|
|
canvas.script.WriteString(leftR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(topR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(radius)
|
|
canvas.script.WriteString(",Math.PI,Math.PI*3/2);\nctx.lineTo(")
|
|
canvas.script.WriteString(rightR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(top)
|
|
canvas.script.WriteString(");\nctx.arc(")
|
|
canvas.script.WriteString(rightR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(topR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(radius)
|
|
canvas.script.WriteString(",Math.PI*3/2,Math.PI*2);\nctx.lineTo(")
|
|
canvas.script.WriteString(right)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(bottomR)
|
|
canvas.script.WriteString(");\nctx.arc(")
|
|
canvas.script.WriteString(rightR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(bottomR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(radius)
|
|
canvas.script.WriteString(",0,Math.PI/2);\nctx.lineTo(")
|
|
canvas.script.WriteString(leftR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(bottom)
|
|
canvas.script.WriteString(");\nctx.arc(")
|
|
canvas.script.WriteString(leftR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(bottomR)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(radius)
|
|
canvas.script.WriteString(",Math.PI/2,Math.PI);\nctx.closePath();")
|
|
}
|
|
|
|
func (canvas *canvasData) FillRoundedRect(x, y, width, height, r float64) {
|
|
canvas.writeRoundedRect(x, y, width, height, r)
|
|
canvas.script.WriteString("\nctx.fill();")
|
|
}
|
|
|
|
func (canvas *canvasData) StrokeRoundedRect(x, y, width, height, r float64) {
|
|
canvas.writeRoundedRect(x, y, width, height, r)
|
|
canvas.script.WriteString("\nctx.stroke();")
|
|
}
|
|
|
|
func (canvas *canvasData) FillAndStrokeRoundedRect(x, y, width, height, r float64) {
|
|
canvas.writeRoundedRect(x, y, width, height, r)
|
|
canvas.script.WriteString("\nctx.fill();\nctx.stroke();")
|
|
}
|
|
|
|
func (canvas *canvasData) writeEllipse(x, y, radiusX, radiusY, rotation float64) {
|
|
yText := strconv.FormatFloat(y, 'g', -1, 64)
|
|
canvas.script.WriteString("\nctx.beginPath();\nctx.moveTo(")
|
|
canvas.script.WriteString(strconv.FormatFloat(x+radiusX, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(yText)
|
|
canvas.script.WriteString(");\nctx.ellipse(")
|
|
canvas.script.WriteString(strconv.FormatFloat(x, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(yText)
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(radiusX, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(radiusY, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(rotation, 'g', -1, 64))
|
|
canvas.script.WriteString(",0,Math.PI*2);")
|
|
}
|
|
|
|
func (canvas *canvasData) FillEllipse(x, y, radiusX, radiusY, rotation float64) {
|
|
if radiusX >= 0 && radiusY >= 0 {
|
|
canvas.writeEllipse(x, y, radiusX, radiusY, rotation)
|
|
canvas.script.WriteString("\nctx.fill();")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) StrokeEllipse(x, y, radiusX, radiusY, rotation float64) {
|
|
if radiusX >= 0 && radiusY >= 0 {
|
|
canvas.writeEllipse(x, y, radiusX, radiusY, rotation)
|
|
canvas.script.WriteString("\nctx.stroke();")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) FillAndStrokeEllipse(x, y, radiusX, radiusY, rotation float64) {
|
|
if radiusX >= 0 && radiusY >= 0 {
|
|
canvas.writeEllipse(x, y, radiusX, radiusY, rotation)
|
|
canvas.script.WriteString("\nctx.fill();\nctx.stroke();")
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) writePointArgs(x, y float64) {
|
|
canvas.script.WriteString(strconv.FormatFloat(x, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(y, 'g', -1, 64))
|
|
}
|
|
|
|
func (canvas *canvasData) writeStringArgs(text string, script *strings.Builder) {
|
|
//rText := []rune(text)
|
|
for _, ch := range text {
|
|
switch ch {
|
|
case '\t':
|
|
script.WriteString(`\t`)
|
|
case '\n':
|
|
script.WriteString(`\n`)
|
|
case '\r':
|
|
script.WriteString(`\r`)
|
|
case '\\':
|
|
script.WriteString(`\\`)
|
|
case '"':
|
|
script.WriteString(`\"`)
|
|
case '\'':
|
|
script.WriteString(`\'`)
|
|
default:
|
|
if ch < ' ' {
|
|
script.WriteString(fmt.Sprintf("\\x%02X", int(ch)))
|
|
} else {
|
|
script.WriteRune(ch)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (canvas *canvasData) FillText(x, y float64, text string) {
|
|
canvas.script.WriteString("\nctx.fillText('")
|
|
canvas.writeStringArgs(text, &canvas.script)
|
|
canvas.script.WriteString(`',`)
|
|
canvas.writePointArgs(x, y)
|
|
canvas.script.WriteString(");")
|
|
}
|
|
|
|
func (canvas *canvasData) StrokeText(x, y float64, text string) {
|
|
canvas.script.WriteString("\nctx.strokeText('")
|
|
canvas.writeStringArgs(text, &canvas.script)
|
|
canvas.script.WriteString(`',`)
|
|
canvas.writePointArgs(x, y)
|
|
canvas.script.WriteString(");")
|
|
}
|
|
|
|
func (canvas *canvasData) FillPath(path Path) {
|
|
canvas.script.WriteString(path.scriptText())
|
|
canvas.script.WriteString("\nctx.fill();")
|
|
}
|
|
|
|
func (canvas *canvasData) StrokePath(path Path) {
|
|
canvas.script.WriteString(path.scriptText())
|
|
canvas.script.WriteString("\nctx.stroke();")
|
|
}
|
|
|
|
func (canvas *canvasData) FillAndStrokePath(path Path) {
|
|
canvas.script.WriteString(path.scriptText())
|
|
canvas.script.WriteString("\nctx.fill();\nctx.stroke();")
|
|
}
|
|
|
|
func (canvas *canvasData) DrawLine(x0, y0, x1, y1 float64) {
|
|
canvas.script.WriteString("\nctx.beginPath();\nctx.moveTo(")
|
|
canvas.script.WriteString(strconv.FormatFloat(x0, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(y0, 'g', -1, 64))
|
|
canvas.script.WriteString(");\nctx.lineTo(")
|
|
canvas.script.WriteString(strconv.FormatFloat(x1, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(y1, 'g', -1, 64))
|
|
canvas.script.WriteString(");\nctx.stroke();")
|
|
}
|
|
|
|
func (canvas *canvasData) DrawImage(x, y float64, image Image) {
|
|
if image == nil || image.LoadingStatus() != ImageReady {
|
|
return
|
|
}
|
|
canvas.script.WriteString("\nimg = images.get('")
|
|
canvas.script.WriteString(image.URL())
|
|
canvas.script.WriteString("');\nif (img) {\nctx.drawImage(img,")
|
|
canvas.script.WriteString(strconv.FormatFloat(x, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(y, 'g', -1, 64))
|
|
canvas.script.WriteString(");\n}")
|
|
}
|
|
|
|
func (canvas *canvasData) DrawImageInRect(x, y, width, height float64, image Image) {
|
|
if image == nil || image.LoadingStatus() != ImageReady {
|
|
return
|
|
}
|
|
canvas.script.WriteString("\nimg = images.get('")
|
|
canvas.script.WriteString(image.URL())
|
|
canvas.script.WriteString("');\nif (img) {\nctx.drawImage(img,")
|
|
canvas.script.WriteString(strconv.FormatFloat(x, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(y, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(width, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(height, 'g', -1, 64))
|
|
canvas.script.WriteString(");\n}")
|
|
}
|
|
|
|
func (canvas *canvasData) DrawImageFragment(srcX, srcY, srcWidth, srcHeight, dstX, dstY, dstWidth, dstHeight float64, image Image) {
|
|
if image == nil || image.LoadingStatus() != ImageReady {
|
|
return
|
|
}
|
|
canvas.script.WriteString("\nimg = images.get('")
|
|
canvas.script.WriteString(image.URL())
|
|
canvas.script.WriteString("');\nif (img) {\nctx.drawImage(img,")
|
|
canvas.script.WriteString(strconv.FormatFloat(srcX, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(srcY, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(srcWidth, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(srcHeight, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(dstX, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(dstY, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(dstWidth, 'g', -1, 64))
|
|
canvas.script.WriteRune(',')
|
|
canvas.script.WriteString(strconv.FormatFloat(dstHeight, 'g', -1, 64))
|
|
canvas.script.WriteString(");\n}")
|
|
}
|