mirror of
https://github.com/xiaoqidun/ofdgo.git
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126 lines
3.5 KiB
Go
126 lines
3.5 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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// defaultPathLineWidth 为默认描边宽度，单位为毫米
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const defaultPathLineWidth = 0.353
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// defaultMiterLimit 为默认尖角截断值
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const defaultMiterLimit = 3.528
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// mergeGraphicObjectAlpha 合并图形对象透明度
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// 入参: obj 图形对象, alpha 父级透明度
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// 返回: GraphicObject 合并后的图形对象
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func mergeGraphicObjectAlpha(obj GraphicObject, alpha *int) GraphicObject {
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if alpha == nil {
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return obj
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}
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switch obj.Type {
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case "TextObject":
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obj.TextObject.Alpha = mergeAlpha(obj.TextObject.Alpha, alpha)
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case "PathObject":
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obj.PathObject.Alpha = mergeAlpha(obj.PathObject.Alpha, alpha)
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case "ImageObject":
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obj.ImageObject.Alpha = mergeAlpha(obj.ImageObject.Alpha, alpha)
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case "CompositeGraphicUnit", "CompositeObject":
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obj.CompositeGraphicUnit.Alpha = mergeAlpha(obj.CompositeGraphicUnit.Alpha, alpha)
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}
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return obj
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}
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// drawParamDefaults 合并绘制参数默认样式
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// 入参: id 绘制参数ID, defaults 默认绘制参数
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// 返回: *DrawParam 合并后的绘制参数
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func (r *Renderer) drawParamDefaults(id string, defaults *DrawParam) *DrawParam {
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if id == "" {
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return defaults
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}
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dp := r.getDrawParam(id, nil)
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if dp == nil {
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return defaults
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}
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if defaults == nil {
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return dp
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}
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return mergeDrawParam(*defaults, dp)
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}
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// mergeDrawParam 合并绘制参数属性
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// 入参: base 基础绘制参数, dp 覆盖绘制参数
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// 返回: *DrawParam 合并后的绘制参数
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func mergeDrawParam(base DrawParam, dp *DrawParam) *DrawParam {
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if dp.LineWidth > 0 || dp.LineWidthSet {
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base.LineWidth = dp.LineWidth
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base.LineWidthSet = dp.LineWidthSet
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}
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if dp.Join != "" {
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base.Join = dp.Join
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}
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if dp.Cap != "" {
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base.Cap = dp.Cap
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}
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if dp.DashPattern != "" || dp.dashPatternSet {
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base.DashPattern = dp.DashPattern
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base.dashPatternSet = dp.dashPatternSet
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}
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if dp.DashOffset != nil {
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base.DashOffset = dp.DashOffset
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}
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if dp.MiterLimit > 0 || dp.MiterLimitSet {
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base.MiterLimit = dp.MiterLimit
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base.MiterLimitSet = dp.MiterLimitSet
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}
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if dp.FillColor != nil {
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base.FillColor = dp.FillColor
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}
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if dp.StrokeColor != nil {
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base.StrokeColor = dp.StrokeColor
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}
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if dp.Font != "" {
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base.Font = dp.Font
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}
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if dp.Size > 0 {
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base.Size = dp.Size
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}
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if dp.Weight > 0 {
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base.Weight = dp.Weight
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}
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if dp.Italic {
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base.Italic = dp.Italic
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}
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return &base
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}
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// getDrawParam 解析绘制参数继承链，按实际资源识别循环引用
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// 入参: id 参数标识, visited 已访问资源
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// 返回: *DrawParam 绘制参数
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func (r *Renderer) getDrawParam(id string, visited map[*DrawParam]bool) *DrawParam {
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dp, _ := resourceValue(r.DrawParams, id)
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if dp == nil || visited[dp] {
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return nil
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}
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if visited == nil {
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visited = make(map[*DrawParam]bool)
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}
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visited[dp] = true
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if dp.Relative != "" {
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base := r.getDrawParam(dp.Relative, visited)
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if base != nil {
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return mergeDrawParam(*base, dp)
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}
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}
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return dp
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}
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