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Added conic gradient to canvas

This commit is contained in:
Alexei Anoshenko 2024-12-04 19:27:33 +03:00
parent 7bb90e5b2a
commit cccf1e6ee1
1 changed files with 42 additions and 0 deletions
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42
canvas.go
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@ -198,6 +198,24 @@ type Canvas interface {
// stopPoints - the array of stop points
SetRadialGradientStrokeStyle(x0, y0, r0 float64, color0 Color, x1, y1, r1 float64, color1 Color, stopPoints []GradientPoint)
// SetConicGradientFillStyle sets a conic gradient around a point
// to use inside shapes
// x, y - coordinates of the center of the conic gradient in pilels;
// startAngle - the angle at which to begin the gradient, in radians. The angle starts from a line going horizontally right from the center, and proceeds clockwise.
// startColor - the start color;
// endColor - the end color;
// stopPoints - the array of stop points. The Pos field of GradientPoint, in the range from 0 to 1, specifies the angle in turns.
SetConicGradientFillStyle(x, y, startAngle float64, startColor, endColor Color, stopPoints []GradientPoint)
// SetConicGradientFillStyle sets a conic gradient around a point
// to use inside shapes
// x, y - coordinates of the center of the conic gradient in pilels;
// startAngle - the angle at which to begin the gradient, in radians. The angle starts from a line going horizontally right from the center, and proceeds clockwise.
// startColor - the start color;
// endColor - the end color;
// stopPoints - the array of stop points. The Pos field of GradientPoint, in the range from 0 to 1, specifies the angle in turns.
SetConicGradientStrokeStyle(x, y, startAngle float64, startColor, endColor Color, stopPoints []GradientPoint)
// SetImageFillStyle set the image as the filling pattern.
// repeat - indicating how to repeat the pattern's image. Possible values are:
// NoRepeat (0) - neither direction,
@ -465,6 +483,30 @@ func (canvas *canvasData) SetRadialGradientStrokeStyle(x0, y0, r0 float64, color
canvas.session.updateCanvasProperty("strokeStyle", gradient)
}
func (canvas *canvasData) createConicGradient(x, y, startAngle float64, startColor, endColor Color, stopPoints []GradientPoint) any {
gradient := canvas.session.createCanvasVar("createConicGradient", startAngle, x, y)
canvas.session.callCanvasVarFunc(gradient, "addColorStop", 0, startColor.cssString())
for _, point := range stopPoints {
if point.Offset >= 0 && point.Offset <= 1 {
canvas.session.callCanvasVarFunc(gradient, "addColorStop", point.Offset, point.Color.cssString())
}
}
canvas.session.callCanvasVarFunc(gradient, "addColorStop", 1, endColor.cssString())
return gradient
}
func (canvas *canvasData) SetConicGradientFillStyle(x, y, startAngle float64, startColor, endColor Color, stopPoints []GradientPoint) {
gradient := canvas.createConicGradient(x, y, startAngle, startColor, endColor, stopPoints)
canvas.session.updateCanvasProperty("fillStyle", gradient)
}
func (canvas *canvasData) SetConicGradientStrokeStyle(x, y, startAngle float64, startColor, endColor Color, stopPoints []GradientPoint) {
gradient := canvas.createConicGradient(x, y, startAngle, startColor, endColor, stopPoints)
canvas.session.updateCanvasProperty("strokeStyle", gradient)
}
func (canvas *canvasData) SetImageFillStyle(image Image, repeat int) {
if image == nil || image.LoadingStatus() != ImageReady {
return