feat(归并文件): 归并根包文件

ofdgo_paint.go

@@ -21,6 +21,18 @@ import (
 	"slices"
 	"strconv"
 	"strings"
+
+	basegeom "github.com/xiaoqidun/ofdgo/internal/base/geom"
+)
+
+// 画刷类型，区分纯色、渐变和图案填充
+const (
+	PaintNone PaintKind = iota
+	PaintSolid
+	PaintLinear
+	PaintRadial
+	PaintPattern
+	PaintMesh
 )
 
 // PatternPaint 底纹画刷
@@ -36,6 +48,36 @@ type profileGradient struct {
 	colors    []MeshVertex
 }
 
+// ColorStop 保存渐变区间位置及预乘RGBA颜色节点
+type ColorStop struct {
+	Offset float64
+	Color  color.RGBA
+}
+
+// PaintKind 区分无画刷、纯色、轴向渐变、径向渐变、图案和网格渐变
+type PaintKind uint8
+
+// Paint 保存后端无关的颜色、渐变和图案，不修改源节点
+type Paint struct {
+	Kind     PaintKind
+	Color    color.RGBA
+	Gradient *Shading
+	Pattern  *PatternPaint
+	Mesh     *MeshShading
+}
+
+// Shading 保存OFD对象局部坐标中的渐变，单位为毫米，纵轴向下
+// Extend、MapType和MapUnit保留标准的延伸及重复语义
+// Sample存在时按单位区间采样源颜色变换，Stops仍保存各段的显示颜色
+type Shading struct {
+	Start, End                   Point
+	StartRadius, EndRadius       float64
+	Stops                        []ColorStop
+	Extend, MapType              string
+	MapUnit, Eccentricity, Angle float64
+	Sample                       func(float64) color.RGBA
+}
+
 // ResolveColor 按文档颜色空间和调色板解析颜色，返回预乘透明度的RGBA
 // 入参: value 颜色分量, index 调色板索引, space 颜色空间标识, alpha 透明度
 // 返回: color.RGBA 标准颜色, error 颜色定义或配置错误
@@ -467,3 +509,70 @@ func (g *profileGradient) At(t float64) color.RGBA {
 	r, green, b := last.rgb(last.Values)
 	return profileColor([3]float64{r, green, b}, last.Alpha)
 }
+
+// ResolvePaint 解析颜色、透明度、渐变分段和图案，不依赖绘图库
+// 入参: fill 填充或转换后的描边节点
+// 返回: Paint 只读画刷, error 无效渐变
+func (r *Renderer) ResolvePaint(fill *FillColor) (Paint, error) {
+	previous := r.renderError
+	r.renderError = nil
+	defer func() { r.renderError = previous }()
+	if fill == nil {
+		return Paint{}, nil
+	}
+	if fill.Pattern != nil {
+		return Paint{Kind: PaintPattern, Pattern: parsePatternPaint(fill)}, nil
+	}
+	if fill.GouraudShd != nil || fill.LaGouraudShd != nil {
+		mesh, err := r.resolveMesh(fill)
+		if err != nil {
+			return Paint{}, err
+		}
+		if r.renderError != nil {
+			return Paint{}, r.renderError
+		}
+		return Paint{Kind: PaintMesh, Mesh: mesh}, nil
+	}
+	base := r.parseFillColor(fill)
+	if r.renderError != nil {
+		return Paint{}, r.renderError
+	}
+	if base == nil {
+		return Paint{}, nil
+	}
+	paint := Paint{Kind: PaintSolid, Color: colorToRGBA(base)}
+	if node := fill.AxialShd; node != nil {
+		start, end := parseFloats(node.StartPoint), parseFloats(node.EndPoint)
+		stops := r.renderGradientStops(node.Segment, fill.Alpha)
+		if r.renderError != nil {
+			return Paint{}, r.renderError
+		}
+		sample, err := r.profileGradient(node.Segment, fill.Alpha)
+		if err != nil {
+			return Paint{}, err
+		}
+		if len(start) >= 2 && len(end) >= 2 && len(stops) != 0 && (!basegeom.Equal(start[0], end[0]) || !basegeom.Equal(start[1], end[1])) {
+			paint.Kind = PaintLinear
+			paint.Gradient = &Shading{Start: Point{X: start[0], Y: start[1]}, End: Point{X: end[0], Y: end[1]}, Stops: stops, Extend: node.Extend, MapType: node.MapType, MapUnit: node.MapUnit}
+			paint.Gradient.Sample = sample
+			return paint, nil
+		}
+	}
+	if node := fill.RadialShd; node != nil && node.EndRadius > 0 {
+		start, end := parseFloats(node.StartPoint), parseFloats(node.EndPoint)
+		stops := r.renderGradientStops(node.Segment, fill.Alpha)
+		if r.renderError != nil {
+			return Paint{}, r.renderError
+		}
+		sample, err := r.profileGradient(node.Segment, fill.Alpha)
+		if err != nil {
+			return Paint{}, err
+		}
+		if len(start) >= 2 && len(end) >= 2 && len(stops) != 0 {
+			paint.Kind = PaintRadial
+			paint.Gradient = &Shading{Start: Point{X: start[0], Y: start[1]}, End: Point{X: end[0], Y: end[1]}, StartRadius: node.StartRadius, EndRadius: node.EndRadius, Stops: stops, Extend: node.Extend, MapType: node.MapType, MapUnit: node.MapUnit, Eccentricity: node.Eccentricity, Angle: node.Angle}
+			paint.Gradient.Sample = sample
+		}
+	}
+	return paint, nil
+}