mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
54 lines
2.3 KiB
Go
54 lines
2.3 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"
|
|
|
|
"github.com/xiaoqidun/pdfgo"
|
|
)
|
|
|
|
// pdfGlyphPath 将字形轮廓变换到PDF页面坐标，二次曲线精确转换为三次曲线
|
|
// 入参: outline 字形轮廓, matrix 字形到页面的变换
|
|
// 返回: pdfgo.Path 页面路径, error 非字体轮廓指令
|
|
func pdfGlyphPath(outline GeometryPath, matrix pdfgo.Matrix) (pdfgo.Path, error) {
|
|
path := pdfgo.Path{Segments: make([]pdfgo.Segment, 0, len(outline))}
|
|
var current, start Point
|
|
point := func(p Point) pdfgo.Point { return matrix.Apply(pdfgo.Point{X: p.X, Y: p.Y}) }
|
|
for _, segment := range outline {
|
|
switch segment.Verb {
|
|
case GeometryMove:
|
|
start = segment.End
|
|
path.Segments = append(path.Segments, pdfgo.Segment{Operator: "M", Points: []pdfgo.Point{point(segment.End)}})
|
|
case GeometryLine:
|
|
path.Segments = append(path.Segments, pdfgo.Segment{Operator: "L", Points: []pdfgo.Point{point(segment.End)}})
|
|
case GeometryQuad:
|
|
c1 := Point{X: current.X + (segment.Control1.X-current.X)*2/3, Y: current.Y + (segment.Control1.Y-current.Y)*2/3}
|
|
c2 := Point{X: segment.End.X + (segment.Control1.X-segment.End.X)*2/3, Y: segment.End.Y + (segment.Control1.Y-segment.End.Y)*2/3}
|
|
path.Segments = append(path.Segments, pdfgo.Segment{Operator: "B", Points: []pdfgo.Point{point(c1), point(c2), point(segment.End)}})
|
|
case GeometryCubic:
|
|
path.Segments = append(path.Segments, pdfgo.Segment{Operator: "B", Points: []pdfgo.Point{point(segment.Control1), point(segment.Control2), point(segment.End)}})
|
|
case GeometryClose:
|
|
path.Segments = append(path.Segments, pdfgo.Segment{Operator: "C"})
|
|
current = start
|
|
continue
|
|
default:
|
|
return pdfgo.Path{}, fmt.Errorf("unsupported PDF glyph geometry verb %d", segment.Verb)
|
|
}
|
|
current = segment.End
|
|
}
|
|
return path, nil
|
|
}
|