feat(归并文件): 归并根包文件

ofdgo_renderer_shading_canvas.go

@@ -366,3 +366,86 @@ func reflectShdGrad(gradient canvas.Grad, period, lo, hi float64) canvas.Grad {
 	}
 	return append(result, canvas.Stop{Offset: 1, Color: gradient.At(reflectShdPosition(hi / period))})
 }
+
+// parseFillPaint 将公共画刷转换为Canvas对象
+// 入参: fillColor 填充颜色节点, x X坐标, y Y坐标, pageH 页面高度
+// 返回: any 填充画刷
+func (r *Renderer) parseFillPaint(fillColor *FillColor, x, y, pageH float64) any {
+	paint, err := r.ResolvePaint(fillColor)
+	if err != nil {
+		r.renderError = err
+		return nil
+	}
+	switch paint.Kind {
+	case PaintNone, PaintPattern:
+		return nil
+	case PaintLinear, PaintRadial:
+		return canvasShading(paint, x, y, pageH)
+	case PaintMesh:
+		return &shdPaint{gradient: newRasterGradientCanvas(&RasterGradient{Kind: RasterMesh, Mesh: paint.Mesh}), view: canvas.Matrix{{1, 0, x}, {0, -1, pageH - y}}}
+	default:
+		return paint.Color
+	}
+}
+
+// parseStrokePaint 解析勾边画刷
+// 入参: strokeColor 勾边颜色节点, x X坐标, y Y坐标, pageH 页面高度
+// 返回: any 勾边画刷
+func (r *Renderer) parseStrokePaint(strokeColor *StrokeColor, x, y, pageH float64) any {
+	return r.parseFillPaint((*FillColor)(strokeColor), x, y, pageH)
+}
+
+// canvasGradient 将公共颜色节点转换为Canvas渐变
+// 入参: stops 渐变色标
+// 返回: canvas.Grad 渐变色标
+func canvasGradient(stops []ColorStop) canvas.Grad {
+	var gradient canvas.Grad
+	for _, stop := range stops {
+		gradient.Add(stop.Offset, stop.Color)
+	}
+	return gradient
+}
+
+// canvasShading 转换坐标与椭圆渐变变换，不重新解析OFD样式
+// 入参: paint 公共渐变画刷, x X坐标, y Y坐标, pageH 页面高度
+// 返回: *shdPaint Canvas渐变画刷
+func canvasShading(paint Paint, x, y, pageH float64) *shdPaint {
+	source := paint.Gradient
+	gradient := canvasGradient(source.Stops)
+	start := canvas.Point{X: x + source.Start.X, Y: pageH - y - source.Start.Y}
+	end := canvas.Point{X: x + source.End.X, Y: pageH - y - source.End.Y}
+	if paint.Kind == PaintLinear {
+		result := newShdPaint(gradient.ToLinear(start, end), source.Extend, source.MapType, source.MapUnit)
+		result.sample = source.Sample
+		return result
+	}
+	result := newShdPaint(gradient.ToRadial(start, source.StartRadius, end, source.EndRadius), source.Extend, source.MapType, source.MapUnit)
+	result.sample = source.Sample
+	if e := source.Eccentricity; 0 < e && e < 1 {
+		result.view = canvas.Identity.Translate(start.X, start.Y).Rotate(-source.Angle).Scale(1, math.Sqrt(1-e*e)).Translate(-start.X, -start.Y)
+		result.gradient = gradient.ToRadial(start, source.StartRadius, result.view.Inv().Dot(end), source.EndRadius)
+	}
+	return result
+}
+
+// axialShdClip 获取轴向渐变的延伸裁剪区域
+// 入参: gradient 轴向渐变, extend 延伸方向, bounds 可见区域
+// 返回: *canvas.Path 裁剪区域
+func axialShdClip(gradient *canvas.LinearGradient, extend int, bounds canvas.Rect) *canvas.Path {
+	if extend == 3 {
+		return nil
+	}
+	d := gradient.End.Sub(gradient.Start)
+	axis := canvas.Matrix{{d.X, -d.Y, gradient.Start.X}, {d.Y, d.X, gradient.Start.Y}}
+	area := bounds.Transform(axis.Inv())
+	if extend&1 == 0 {
+		area.X0 = math.Max(area.X0, 0)
+	}
+	if extend&2 == 0 {
+		area.X1 = math.Min(area.X1, 1)
+	}
+	if area.X1 <= area.X0 {
+		return &canvas.Path{}
+	}
+	return area.ToPath().Transform(axis)
+}