draw2d/path/drawing_kit.go
2015-04-27 12:14:34 +02:00

44 lines
1.2 KiB
Go

// Copyright 2010 The draw2d Authors. All rights reserved.
// created: 13/12/2010 by Laurent Le Goff
package path
import (
"math"
)
// Rectangle draw a rectangle using a PathBuilder
func Rectangle(path PathBuilder, x1, y1, x2, y2 float64) {
path.MoveTo(x1, y1)
path.LineTo(x2, y1)
path.LineTo(x2, y2)
path.LineTo(x1, y2)
path.Close()
}
// RoundedRectangle draw a rounded rectangle using a PathBuilder
func RoundedRectangle(path PathBuilder, x1, y1, x2, y2, arcWidth, arcHeight float64) {
arcWidth = arcWidth / 2
arcHeight = arcHeight / 2
path.MoveTo(x1, y1+arcHeight)
path.QuadCurveTo(x1, y1, x1+arcWidth, y1)
path.LineTo(x2-arcWidth, y1)
path.QuadCurveTo(x2, y1, x2, y1+arcHeight)
path.LineTo(x2, y2-arcHeight)
path.QuadCurveTo(x2, y2, x2-arcWidth, y2)
path.LineTo(x1+arcWidth, y2)
path.QuadCurveTo(x1, y2, x1, y2-arcHeight)
path.Close()
}
// Ellipse draw an ellipse using a PathBuilder
func Ellipse(path PathBuilder, cx, cy, rx, ry float64) {
path.ArcTo(cx, cy, rx, ry, 0, -math.Pi*2)
path.Close()
}
// Circle draw an circle using a PathBuilder
func Circle(path PathBuilder, cx, cy, radius float64) {
path.ArcTo(cx, cy, radius, radius, 0, -math.Pi*2)
path.Close()
}