mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
41 lines
1.4 KiB
Go
41 lines
1.4 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 pdf
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import (
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"github.com/xiaoqidun/pdfgo"
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)
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// PageMatrix 将裁剪框、用户单位及页面旋转转换为OFD毫米坐标
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// 入参: page PDF页面
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// 返回: pdfgo.Matrix 坐标变换, float64 页面宽度, float64 页面高度
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func PageMatrix(page *pdfgo.Page) (pdfgo.Matrix, float64, float64) {
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b := page.CropBox
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scale := 25.4 / 72 * page.UserUnit
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width, height := (b.XMax-b.XMin)*scale, (b.YMax-b.YMin)*scale
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m := pdfgo.Matrix{scale, 0, 0, -scale, -b.XMin * scale, b.YMax * scale}
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switch page.Rotation {
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case 90:
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m = pdfgo.Matrix{0, 1, -1, 0, height, 0}.Mul(m)
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width, height = height, width
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case 180:
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m = pdfgo.Matrix{-1, 0, 0, -1, width, height}.Mul(m)
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case 270:
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m = pdfgo.Matrix{0, -1, 1, 0, 0, width}.Mul(m)
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width, height = height, width
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}
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return m, width, height
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}
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