mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
54 lines
2.3 KiB
Go
54 lines
2.3 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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"github.com/xiaoqidun/pdfgo"
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)
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// 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
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// 入参: outline 字形轮廓, matrix 字形到页面的变换
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// 返回: pdfgo.Path 页面路径, error 非字体轮廓指令
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func pdfGlyphPath(outline GeometryPath, matrix pdfgo.Matrix) (pdfgo.Path, error) {
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path := pdfgo.Path{Segments: make([]pdfgo.Segment, 0, len(outline))}
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var current, start Point
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point := func(p Point) pdfgo.Point { return matrix.Apply(pdfgo.Point{X: p.X, Y: p.Y}) }
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for _, segment := range outline {
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switch segment.Verb {
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case GeometryMove:
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start = segment.End
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path.Segments = append(path.Segments, pdfgo.Segment{Operator: "M", Points: []pdfgo.Point{point(segment.End)}})
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case GeometryLine:
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path.Segments = append(path.Segments, pdfgo.Segment{Operator: "L", Points: []pdfgo.Point{point(segment.End)}})
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case GeometryQuad:
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c1 := Point{current.X + (segment.Control1.X-current.X)*2/3, current.Y + (segment.Control1.Y-current.Y)*2/3}
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c2 := Point{segment.End.X + (segment.Control1.X-segment.End.X)*2/3, segment.End.Y + (segment.Control1.Y-segment.End.Y)*2/3}
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path.Segments = append(path.Segments, pdfgo.Segment{Operator: "B", Points: []pdfgo.Point{point(c1), point(c2), point(segment.End)}})
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case GeometryCubic:
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path.Segments = append(path.Segments, pdfgo.Segment{Operator: "B", Points: []pdfgo.Point{point(segment.Control1), point(segment.Control2), point(segment.End)}})
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case GeometryClose:
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path.Segments = append(path.Segments, pdfgo.Segment{Operator: "C"})
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current = start
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continue
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default:
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return pdfgo.Path{}, fmt.Errorf("unsupported PDF glyph geometry verb %d", segment.Verb)
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}
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current = segment.End
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}
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return path, nil
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}
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