48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
// Copyright 2010 The draw2d Authors. All rights reserved.
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// created: 13/12/2010 by Laurent Le Goff
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// Package draw2dkit provides helpers to draw common figures using a Path
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package draw2dkit
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import (
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"math"
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"github.com/llgcode/draw2d"
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)
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// Rectangle draws a rectangle using a path between (x1,y1) and (x2,y2)
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func Rectangle(path draw2d.PathBuilder, x1, y1, x2, y2 float64) {
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path.MoveTo(x1, y1)
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path.LineTo(x2, y1)
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path.LineTo(x2, y2)
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path.LineTo(x1, y2)
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path.Close()
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}
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// RoundedRectangle draws a rectangle using a path between (x1,y1) and (x2,y2)
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func RoundedRectangle(path draw2d.PathBuilder, x1, y1, x2, y2, arcWidth, arcHeight float64) {
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arcWidth = arcWidth / 2
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arcHeight = arcHeight / 2
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path.MoveTo(x1, y1+arcHeight)
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path.QuadCurveTo(x1, y1, x1+arcWidth, y1)
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path.LineTo(x2-arcWidth, y1)
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path.QuadCurveTo(x2, y1, x2, y1+arcHeight)
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path.LineTo(x2, y2-arcHeight)
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path.QuadCurveTo(x2, y2, x2-arcWidth, y2)
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path.LineTo(x1+arcWidth, y2)
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path.QuadCurveTo(x1, y2, x1, y2-arcHeight)
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path.Close()
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}
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// Ellipse draws an ellipse using a path with center (cx,cy) and radius (rx,ry)
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func Ellipse(path draw2d.PathBuilder, cx, cy, rx, ry float64) {
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path.ArcTo(cx, cy, rx, ry, 0, -math.Pi*2)
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path.Close()
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}
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// Circle draws a circle using a path with center (cx,cy) and radius
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func Circle(path draw2d.PathBuilder, cx, cy, radius float64) {
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path.ArcTo(cx, cy, radius, radius, 0, -math.Pi*2)
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path.Close()
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}
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