draw2d/advanced_path.go

// Copyright 2010 The draw2d Authors. All rights reserved.
// created: 13/12/2010 by Laurent Le Goff

//high level path creation

package draw2d

import (
	"math"
)

// Rect draws a rectangle between (x1,y1) and (x2,y2)
func Rect(path Path, x1, y1, x2, y2 float64) {
	path.MoveTo(x1, y1)
	path.LineTo(x2, y1)
	path.LineTo(x2, y2)
	path.LineTo(x1, y2)
	path.Close()
}

// RoundRect draws a rectangle between (x1,y1) and (x2,y2) with rounded corners
func RoundRect(path Path, 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 is drawn with center (cx,cy) and radius (rx,ry)
func Ellipse(path Path, cx, cy, rx, ry float64) {
	path.MoveTo(cx-rx, cy)
	path.ArcTo(cx, cy, rx, ry, 0, -math.Pi*2)
	path.Close()
}

// Circle is drawn with center (cx,cy) and radius
func Circle(path Path, cx, cy, radius float64) {
	path.MoveTo(cx-radius, cy)
	path.ArcTo(cx, cy, radius, radius, 0, -math.Pi*2)
	path.Close()
}