mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
97 lines
3.4 KiB
Go
97 lines
3.4 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package ofdgo
|
|
|
|
import "fmt"
|
|
|
|
// GeometryOperation 指定路径填充区域的布尔运算
|
|
type GeometryOperation uint8
|
|
|
|
const (
|
|
GeometryIntersect GeometryOperation = iota
|
|
GeometryUnion
|
|
GeometrySubtract
|
|
GeometryXor
|
|
)
|
|
|
|
// StrokeOptions 描述毫米单位的描边，Cap和Join使用OFD名称
|
|
// Tolerance为曲线展开误差，0采用后端默认精度，Dashes和DashOffset为绝对长度
|
|
type StrokeOptions struct {
|
|
Width float64
|
|
Cap, Join string
|
|
MiterLimit, DashOffset, Tolerance float64
|
|
Dashes []float64
|
|
}
|
|
|
|
// GeometryBackend 操作库自有路径，坐标以页面左上角为原点，不修改任何输入
|
|
// Clip返回nil表示不裁剪，空路径指针表示完全裁去，矩阵映射到页面坐标
|
|
type GeometryBackend interface {
|
|
Backend
|
|
Path(object PathObject) (GeometryPath, error)
|
|
Region(region *Region, matrix Matrix) (GeometryPath, error)
|
|
Bounds(path GeometryPath) (Box, error)
|
|
Transform(path GeometryPath, matrix Matrix) (GeometryPath, error)
|
|
Normalize(path GeometryPath, evenOdd bool) (GeometryPath, error)
|
|
Combine(left, right GeometryPath, operation GeometryOperation) (GeometryPath, error)
|
|
Stroke(path GeometryPath, options StrokeOptions) (GeometryPath, error)
|
|
Clip(renderer *Renderer, clips *Clips, matrix Matrix, parent *GeometryPath) (*GeometryPath, error)
|
|
}
|
|
|
|
// Geometry 返回当前几何后端，不隐式恢复默认实现
|
|
// 返回: GeometryBackend 几何后端, error 未配置错误
|
|
func (r *Renderer) Geometry() (GeometryBackend, error) {
|
|
if r.backends.Geometry == nil {
|
|
return nil, fmt.Errorf("geometry: %w", ErrBackendUnavailable)
|
|
}
|
|
return r.backends.Geometry, nil
|
|
}
|
|
|
|
// Geometry 返回编辑器配置的几何后端
|
|
// 返回: GeometryBackend 几何后端, error 未配置错误
|
|
func (e *Editor) Geometry() (GeometryBackend, error) {
|
|
if e.backends.Geometry == nil {
|
|
return nil, fmt.Errorf("geometry: %w", ErrBackendUnavailable)
|
|
}
|
|
return e.backends.Geometry, nil
|
|
}
|
|
|
|
// PathOutline 使用配置的几何后端生成页面坐标中的SVG轮廓
|
|
// 入参: object 路径对象
|
|
// 返回: string SVG路径, error 几何或编码错误
|
|
func (r *Renderer) PathOutline(object PathObject) (string, error) {
|
|
geometry, err := r.Geometry()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
path, err := geometry.Path(object)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return path.SVG()
|
|
}
|
|
|
|
// geometryRectangle 构建页面坐标矩形，保留输入精度
|
|
// 入参: box 矩形范围
|
|
// 返回: GeometryPath 闭合路径
|
|
func geometryRectangle(box Box) GeometryPath {
|
|
return GeometryPath{
|
|
{Verb: GeometryMove, End: Point{X: box.X, Y: box.Y}},
|
|
{Verb: GeometryLine, End: Point{X: box.X + box.W, Y: box.Y}},
|
|
{Verb: GeometryLine, End: Point{X: box.X + box.W, Y: box.Y + box.H}},
|
|
{Verb: GeometryLine, End: Point{X: box.X, Y: box.Y + box.H}},
|
|
{Verb: GeometryClose, End: Point{X: box.X, Y: box.Y}},
|
|
}
|
|
}
|