mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
114 lines
3.6 KiB
Go
114 lines
3.6 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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import (
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"fmt"
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"strings"
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)
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// GeometryPath 保存独立于绘图库的几何路径，不扁平化曲线或舍入坐标
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// 坐标以左上角为原点，单位为毫米，子路径从Move开始，Close回到当前子路径起点
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type GeometryPath []GeometrySegment
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// GeometryVerb 表示几何路径指令
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type GeometryVerb uint8
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const (
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GeometryMove GeometryVerb = iota
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GeometryLine
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GeometryQuad
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GeometryCubic
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GeometryArc
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GeometryClose
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)
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// GeometrySegment 保存路径端点、贝塞尔控制点或端点式椭圆弧参数
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// 弧线Rotation单位为度，Sweep为true表示顺时针，Large表示大弧
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type GeometrySegment struct {
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Verb GeometryVerb
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End Point
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Control1, Control2 Point
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RadiusX, RadiusY float64
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Rotation float64
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Large, Sweep bool
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}
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// SVG 将几何路径编码为SVG路径，不改变曲线或坐标精度
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// 返回: string SVG路径, error 不支持的路径指令
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func (p GeometryPath) SVG() (string, error) {
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return p.encode(true)
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}
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// OFD 将几何路径编码为OFD紧缩路径
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// 返回: string 紧缩路径, error 不支持的路径指令
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func (p GeometryPath) OFD() (string, error) {
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return p.encode(false)
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}
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// encode 按目标格式写入路径，圆弧标志采用两种格式均支持的0和1
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// 入参: svg 是否使用SVG指令
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// 返回: string 路径数据, error 不支持的路径指令
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func (p GeometryPath) encode(svg bool) (string, error) {
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var value strings.Builder
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for _, segment := range p {
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x, y := ofdNumber(segment.End.X), ofdNumber(segment.End.Y)
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switch segment.Verb {
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case GeometryMove:
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fmt.Fprintf(&value, "M %s %s ", x, y)
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case GeometryLine:
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fmt.Fprintf(&value, "L %s %s ", x, y)
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case GeometryQuad:
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fmt.Fprintf(&value, "Q %s %s %s %s ", ofdNumber(segment.Control1.X), ofdNumber(segment.Control1.Y), x, y)
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case GeometryCubic:
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command := "B"
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if svg {
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command = "C"
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}
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fmt.Fprintf(&value, "%s %s %s %s %s %s %s ", command, ofdNumber(segment.Control1.X), ofdNumber(segment.Control1.Y), ofdNumber(segment.Control2.X), ofdNumber(segment.Control2.Y), x, y)
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case GeometryArc:
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large, sweep := 0, 0
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if segment.Large {
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large = 1
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}
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if segment.Sweep {
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sweep = 1
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}
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fmt.Fprintf(&value, "A %s %s %s %d %d %s %s ", ofdNumber(segment.RadiusX), ofdNumber(segment.RadiusY), ofdNumber(segment.Rotation), large, sweep, x, y)
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case GeometryClose:
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if svg {
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value.WriteString("Z ")
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} else {
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value.WriteString("C ")
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}
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default:
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return "", fmt.Errorf("unsupported geometry command %d", segment.Verb)
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}
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}
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return strings.TrimSpace(value.String()), nil
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}
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// geometryClipPath 将页面路径转换为标准填充裁剪对象
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// 入参: path 页面毫米路径
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// 返回: PathObject 裁剪路径, error 无效指令错误
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func geometryClipPath(path GeometryPath) (PathObject, error) {
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data, err := path.OFD()
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if err != nil {
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return PathObject{}, err
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}
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fill, stroke := true, false
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return PathObject{Boundary: "0 0 1 1", Fill: &fill, Stroke: &stroke, AbbreviatedData: data}, nil
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}
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