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65 lines
2.5 KiB
Go
65 lines
2.5 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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"math"
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)
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// ShapeKind 基本图形类型
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type ShapeKind string
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const (
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ShapeLine ShapeKind = "line"
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ShapeRectangle ShapeKind = "rectangle"
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ShapeEllipse ShapeKind = "ellipse"
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)
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// NewShape 创建使用标准紧缩路径的图形，默认黑色描边、不填充。
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// 可调整返回对象的颜色、线宽等属性后通过 Editor.AddObject 写入。
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// 入参: kind 图形类型, box 图形范围；直线从 (X,Y) 到 (X+W,Y+H)，W、H 可为负或零
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// 返回: PathObject 路径对象, error 错误信息
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func NewShape(kind ShapeKind, box Box) (PathObject, error) {
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if !finite(box.X) || !finite(box.Y) || !finite(box.W) || !finite(box.H) || !finite(box.X+box.W) || !finite(box.Y+box.H) {
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return PathObject{}, fmt.Errorf("shape coordinates must be finite")
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}
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object := PathObject{LineWidth: defaultPathLineWidth}
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switch kind {
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case ShapeLine:
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if box.W == 0 && box.H == 0 {
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return PathObject{}, fmt.Errorf("line endpoints must differ")
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}
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// 为水平、垂直直线保留有效的正尺寸边界，路径端点不变。
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x, y := math.Min(0, box.W)-defaultPathLineWidth/2, math.Min(0, box.H)-defaultPathLineWidth/2
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object.AbbreviatedData = fmt.Sprintf("M %g %g L %g %g", -x, -y, box.W-x, box.H-y)
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box = Box{X: box.X + x, Y: box.Y + y, W: math.Abs(box.W) + defaultPathLineWidth, H: math.Abs(box.H) + defaultPathLineWidth}
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case ShapeRectangle, ShapeEllipse:
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if box.W <= 0 || box.H <= 0 {
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return PathObject{}, fmt.Errorf("shape dimensions must be positive")
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}
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if kind == ShapeRectangle {
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object.AbbreviatedData = fmt.Sprintf("M 0 0 L %g 0 L %g %g L 0 %g C", box.W, box.W, box.H, box.H)
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} else {
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rx, ry := box.W/2, box.H/2
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object.AbbreviatedData = fmt.Sprintf("M 0 %g A %g %g 0 0 1 %g %g A %g %g 0 0 1 0 %g C", ry, rx, ry, box.W, ry, rx, ry, ry)
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}
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default:
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return PathObject{}, fmt.Errorf("unsupported shape %q", kind)
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}
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object.Boundary = fmt.Sprintf("%g %g %g %g", box.X, box.Y, box.W, box.H)
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return object, nil
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}
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