mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
65 lines
2.5 KiB
Go
65 lines
2.5 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"
|
||
"math"
|
||
)
|
||
|
||
// ShapeKind 基本图形类型
|
||
type ShapeKind string
|
||
|
||
const (
|
||
ShapeLine ShapeKind = "line"
|
||
ShapeRectangle ShapeKind = "rectangle"
|
||
ShapeEllipse ShapeKind = "ellipse"
|
||
)
|
||
|
||
// NewShape 创建使用标准紧缩路径的图形，默认黑色描边、不填充。
|
||
// 可调整返回对象的颜色、线宽等属性后通过 Editor.AddObject 写入。
|
||
// 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
|
||
// 返回: PathObject 路径对象, error 错误信息
|
||
func NewShape(kind ShapeKind, box Box) (PathObject, error) {
|
||
if !finite(box.X) || !finite(box.Y) || !finite(box.W) || !finite(box.H) || !finite(box.X+box.W) || !finite(box.Y+box.H) {
|
||
return PathObject{}, fmt.Errorf("shape coordinates must be finite")
|
||
}
|
||
object := PathObject{LineWidth: defaultPathLineWidth}
|
||
switch kind {
|
||
case ShapeLine:
|
||
if box.W == 0 && box.H == 0 {
|
||
return PathObject{}, fmt.Errorf("line endpoints must differ")
|
||
}
|
||
// 为水平、垂直直线保留有效的正尺寸边界，路径端点不变。
|
||
x, y := math.Min(0, box.W)-defaultPathLineWidth/2, math.Min(0, box.H)-defaultPathLineWidth/2
|
||
object.AbbreviatedData = fmt.Sprintf("M %g %g L %g %g", -x, -y, box.W-x, box.H-y)
|
||
box = Box{X: box.X + x, Y: box.Y + y, W: math.Abs(box.W) + defaultPathLineWidth, H: math.Abs(box.H) + defaultPathLineWidth}
|
||
case ShapeRectangle, ShapeEllipse:
|
||
if box.W <= 0 || box.H <= 0 {
|
||
return PathObject{}, fmt.Errorf("shape dimensions must be positive")
|
||
}
|
||
if kind == ShapeRectangle {
|
||
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)
|
||
} else {
|
||
rx, ry := box.W/2, box.H/2
|
||
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)
|
||
}
|
||
default:
|
||
return PathObject{}, fmt.Errorf("unsupported shape %q", kind)
|
||
}
|
||
object.Boundary = fmt.Sprintf("%g %g %g %g", box.X, box.Y, box.W, box.H)
|
||
return object, nil
|
||
}
|