mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
100 lines
2.9 KiB
Go
100 lines
2.9 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 "slices"
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// TextPositioner 按OFD坐标及增量定位连续字形，不依赖字体或绘图库
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type TextPositioner struct {
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xs, ys, dxs, dys []float64
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direction Point
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current Point
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previous float64
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index int
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}
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// textCodeOrigins 按标准继承文本段原点，首段缺失坐标时以零横坐标和字体上升高度容错恢复
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// 入参: codes 文本段, ascent 对象坐标系下的字体上升高度
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// 返回: []TextCode 定位文本段，不修改原始数据
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func textCodeOrigins(codes []TextCode, ascent float64) []TextCode {
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for i, code := range codes {
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if code.X != "" && code.Y != "" {
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continue
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}
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result := slices.Clone(codes)
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var x, y string
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if i > 0 {
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x, y = codes[i-1].X, codes[i-1].Y
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} else {
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x, y = "0", ofdNumber(ascent)
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}
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for j := i; j < len(result); j++ {
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if result[j].X == "" {
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result[j].X = x
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}
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if result[j].Y == "" {
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result[j].Y = y
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}
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x, y = result[j].X, result[j].Y
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}
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return result
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}
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return codes
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}
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// NewTextPositioner 创建单个TextCode的定位器，方向采用OFD角度
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// 入参: code 文本定位数据, direction 阅读方向
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// 返回: TextPositioner 字形定位器
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func NewTextPositioner(code TextCode, direction int) TextPositioner {
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result := TextPositioner{xs: parseFloats(code.X), ys: parseFloats(code.Y), dxs: parseFloats(code.DeltaX), dys: parseFloats(code.DeltaY), direction: Point{X: 1}}
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switch direction {
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case 90:
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result.direction = Point{Y: 1}
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case 180:
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result.direction = Point{X: -1}
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case 270:
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result.direction = Point{Y: -1}
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}
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return result
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}
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// Next 返回下一个字形位置并保存其推进长度，显式坐标和增量优先
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// 入参: advance 当前字形推进长度，单位为毫米
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// 返回: Point 字形原点
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func (p *TextPositioner) Next(advance float64) Point {
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i := p.index
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if i < len(p.xs) {
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p.current.X = p.xs[i]
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} else if i > 0 {
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if dx, ok := textDelta(p.dxs, i-1); ok {
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p.current.X += dx
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} else if len(p.dys) == 0 {
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p.current.X += p.previous * p.direction.X
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}
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}
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if i < len(p.ys) {
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p.current.Y = p.ys[i]
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} else if i > 0 {
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if dy, ok := textDelta(p.dys, i-1); ok {
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p.current.Y += dy
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} else if len(p.dxs) == 0 {
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p.current.Y += p.previous * p.direction.Y
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}
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}
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p.previous = advance
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p.index++
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return p.current
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}
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