rui_orig/path.go

131 lines
4.9 KiB
Go

package rui
// Path is a path interface
type Path interface {
// MoveTo begins a new sub-path at the point specified by the given (x, y) coordinates
MoveTo(x, y float64)
// LineTo adds a straight line to the current sub-path by connecting
// the sub-path's last point to the specified (x, y) coordinates
LineTo(x, y float64)
// ArcTo adds a circular arc to the current sub-path, using the given control points and radius.
// The arc is automatically connected to the path's latest point with a straight line, if necessary.
// x0, y0 - coordinates of the first control point;
// x1, y1 - coordinates of the second control point;
// radius - the arc's radius. Must be non-negative.
ArcTo(x0, y0, x1, y1, radius float64)
// Arc adds a circular arc to the current sub-path.
// x, y - coordinates of the arc's center;
// radius - the arc's radius. Must be non-negative;
// startAngle - the angle at which the arc starts, measured clockwise from the positive
// x-axis and expressed in radians.
// endAngle - the angle at which the arc ends, measured clockwise from the positive
// x-axis and expressed in radians.
// clockwise - if true, causes the arc to be drawn clockwise between the start and end angles,
// otherwise - counter-clockwise
Arc(x, y, radius, startAngle, endAngle float64, clockwise bool)
// BezierCurveTo adds a cubic Bézier curve to the current sub-path. The starting point is
// the latest point in the current path.
// cp0x, cp0y - coordinates of the first control point;
// cp1x, cp1y - coordinates of the second control point;
// x, y - coordinates of the end point.
BezierCurveTo(cp0x, cp0y, cp1x, cp1y, x, y float64)
// QuadraticCurveTo adds a quadratic Bézier curve to the current sub-path.
// cpx, cpy - coordinates of the control point;
// x, y - coordinates of the end point.
QuadraticCurveTo(cpx, cpy, x, y float64)
// Ellipse adds an elliptical arc to the current sub-path
// x, y - coordinates of the ellipse's center;
// radiusX - the ellipse's major-axis radius. Must be non-negative;
// radiusY - the ellipse's minor-axis radius. Must be non-negative;
// rotation - the rotation of the ellipse, expressed in radians;
// startAngle - the angle at which the ellipse starts, measured clockwise
// from the positive x-axis and expressed in radians;
// endAngle - the angle at which the ellipse ends, measured clockwise
// from the positive x-axis and expressed in radians.
// clockwise - if true, draws the ellipse clockwise, otherwise draws counter-clockwise
Ellipse(x, y, radiusX, radiusY, rotation, startAngle, endAngle float64, clockwise bool)
// Close adds a straight line from the current point to the start of the current sub-path.
// If the shape has already been closed or has only one point, this function does nothing.
Close()
//create(session Session)
obj() any
}
type pathData struct {
session Session
varName any
}
// NewPath creates a new empty Path
func (canvas *canvasData) NewPath() Path {
path := new(pathData)
path.session = canvas.session
path.varName = canvas.session.createPath("")
return path
}
func (canvas *canvasData) NewPathFromSvg(data string) Path {
path := new(pathData)
path.session = canvas.session
path.varName = canvas.session.createPath(data)
return path
}
func (path *pathData) MoveTo(x, y float64) {
path.session.callCanvasVarFunc(path.varName, "moveTo", x, y)
}
func (path *pathData) LineTo(x, y float64) {
path.session.callCanvasVarFunc(path.varName, "lineTo", x, y)
}
func (path *pathData) ArcTo(x0, y0, x1, y1, radius float64) {
if radius > 0 {
path.session.callCanvasVarFunc(path.varName, "arcTo", x0, y0, x1, y1, radius)
}
}
func (path *pathData) Arc(x, y, radius, startAngle, endAngle float64, clockwise bool) {
if radius > 0 {
if !clockwise {
path.session.callCanvasVarFunc(path.varName, "arc", x, y, radius, startAngle, endAngle, true)
} else {
path.session.callCanvasVarFunc(path.varName, "arc", x, y, radius, startAngle, endAngle)
}
}
}
func (path *pathData) BezierCurveTo(cp0x, cp0y, cp1x, cp1y, x, y float64) {
path.session.callCanvasVarFunc(path.varName, "bezierCurveTo", cp0x, cp0y, cp1x, cp1y, x, y)
}
func (path *pathData) QuadraticCurveTo(cpx, cpy, x, y float64) {
path.session.callCanvasVarFunc(path.varName, "quadraticCurveTo", cpx, cpy, x, y)
}
func (path *pathData) Ellipse(x, y, radiusX, radiusY, rotation, startAngle, endAngle float64, clockwise bool) {
if radiusX > 0 && radiusY > 0 {
if !clockwise {
path.session.callCanvasVarFunc(path.varName, "ellipse", x, y, radiusX, radiusY, rotation, startAngle, endAngle, true)
} else {
path.session.callCanvasVarFunc(path.varName, "ellipse", x, y, radiusX, radiusY, rotation, startAngle, endAngle)
}
}
}
func (path *pathData) Close() {
path.session.callCanvasVarFunc(path.varName, "closePath")
}
func (path *pathData) obj() any {
return path.varName
}