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Diffstat (limited to 'vendor/github.com/llgcode/draw2d/samples/geometry/geometry.go')
-rw-r--r--vendor/github.com/llgcode/draw2d/samples/geometry/geometry.go334
1 files changed, 334 insertions, 0 deletions
diff --git a/vendor/github.com/llgcode/draw2d/samples/geometry/geometry.go b/vendor/github.com/llgcode/draw2d/samples/geometry/geometry.go
new file mode 100644
index 0000000..99f1731
--- /dev/null
+++ b/vendor/github.com/llgcode/draw2d/samples/geometry/geometry.go
@@ -0,0 +1,334 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 21/11/2010 by Laurent Le Goff
+
+// Package geometry draws some geometric tests.
+package geometry
+
+import (
+ "image"
+ "image/color"
+ "math"
+
+ "github.com/llgcode/draw2d"
+ "github.com/llgcode/draw2d/draw2dkit"
+ "github.com/llgcode/draw2d/samples"
+ "github.com/llgcode/draw2d/samples/gopher2"
+)
+
+// Main draws geometry and returns the filename. This should only be
+// used during testing.
+func Main(gc draw2d.GraphicContext, ext string) (string, error) {
+ // Draw the droid
+ Draw(gc, 297, 210)
+
+ // Return the output filename
+ return samples.Output("geometry", ext), nil
+}
+
+// Bubble draws a text balloon.
+func Bubble(gc draw2d.GraphicContext, x, y, width, height float64) {
+ sx, sy := width/100, height/100
+ gc.MoveTo(x+sx*50, y)
+ gc.QuadCurveTo(x, y, x, y+sy*37.5)
+ gc.QuadCurveTo(x, y+sy*75, x+sx*25, y+sy*75)
+ gc.QuadCurveTo(x+sx*25, y+sy*95, x+sx*5, y+sy*100)
+ gc.QuadCurveTo(x+sx*35, y+sy*95, x+sx*40, y+sy*75)
+ gc.QuadCurveTo(x+sx*100, y+sy*75, x+sx*100, y+sy*37.5)
+ gc.QuadCurveTo(x+sx*100, y, x+sx*50, y)
+ gc.Stroke()
+}
+
+// CurveRectangle draws a rectangle with bezier curves (not rounded rectangle).
+func CurveRectangle(gc draw2d.GraphicContext, x0, y0,
+ rectWidth, rectHeight float64, stroke, fill color.Color) {
+ radius := (rectWidth + rectHeight) / 4
+
+ x1 := x0 + rectWidth
+ y1 := y0 + rectHeight
+ if rectWidth/2 < radius {
+ if rectHeight/2 < radius {
+ gc.MoveTo(x0, (y0+y1)/2)
+ gc.CubicCurveTo(x0, y0, x0, y0, (x0+x1)/2, y0)
+ gc.CubicCurveTo(x1, y0, x1, y0, x1, (y0+y1)/2)
+ gc.CubicCurveTo(x1, y1, x1, y1, (x1+x0)/2, y1)
+ gc.CubicCurveTo(x0, y1, x0, y1, x0, (y0+y1)/2)
+ } else {
+ gc.MoveTo(x0, y0+radius)
+ gc.CubicCurveTo(x0, y0, x0, y0, (x0+x1)/2, y0)
+ gc.CubicCurveTo(x1, y0, x1, y0, x1, y0+radius)
+ gc.LineTo(x1, y1-radius)
+ gc.CubicCurveTo(x1, y1, x1, y1, (x1+x0)/2, y1)
+ gc.CubicCurveTo(x0, y1, x0, y1, x0, y1-radius)
+ }
+ } else {
+ if rectHeight/2 < radius {
+ gc.MoveTo(x0, (y0+y1)/2)
+ gc.CubicCurveTo(x0, y0, x0, y0, x0+radius, y0)
+ gc.LineTo(x1-radius, y0)
+ gc.CubicCurveTo(x1, y0, x1, y0, x1, (y0+y1)/2)
+ gc.CubicCurveTo(x1, y1, x1, y1, x1-radius, y1)
+ gc.LineTo(x0+radius, y1)
+ gc.CubicCurveTo(x0, y1, x0, y1, x0, (y0+y1)/2)
+ } else {
+ gc.MoveTo(x0, y0+radius)
+ gc.CubicCurveTo(x0, y0, x0, y0, x0+radius, y0)
+ gc.LineTo(x1-radius, y0)
+ gc.CubicCurveTo(x1, y0, x1, y0, x1, y0+radius)
+ gc.LineTo(x1, y1-radius)
+ gc.CubicCurveTo(x1, y1, x1, y1, x1-radius, y1)
+ gc.LineTo(x0+radius, y1)
+ gc.CubicCurveTo(x0, y1, x0, y1, x0, y1-radius)
+ }
+ }
+ gc.Close()
+ gc.SetStrokeColor(stroke)
+ gc.SetFillColor(fill)
+ gc.SetLineWidth(10.0)
+ gc.FillStroke()
+}
+
+// Dash draws a line with a dash pattern
+func Dash(gc draw2d.GraphicContext, x, y, width, height float64) {
+ sx, sy := width/162, height/205
+ gc.SetStrokeColor(image.Black)
+ gc.SetLineDash([]float64{height / 10, height / 50, height / 50, height / 50}, -50.0)
+ gc.SetLineCap(draw2d.ButtCap)
+ gc.SetLineJoin(draw2d.RoundJoin)
+ gc.SetLineWidth(height / 50)
+
+ gc.MoveTo(x+sx*60.0, y)
+ gc.LineTo(x+sx*60.0, y)
+ gc.LineTo(x+sx*162, y+sy*205)
+ rLineTo(gc, sx*-102.4, 0)
+ gc.CubicCurveTo(x+sx*-17, y+sy*205, x+sx*-17, y+sy*103, x+sx*60.0, y+sy*103.0)
+ gc.Stroke()
+ gc.SetLineDash(nil, 0.0)
+}
+
+// Arc draws an arc with a positive angle (clockwise)
+func Arc(gc draw2d.GraphicContext, xc, yc, width, height float64) {
+ // draw an arc
+ xc += width / 2
+ yc += height / 2
+ radiusX, radiusY := width/2, height/2
+ startAngle := 45 * (math.Pi / 180.0) /* angles are specified */
+ angle := 135 * (math.Pi / 180.0) /* clockwise in radians */
+ gc.SetLineWidth(width / 10)
+ gc.SetLineCap(draw2d.ButtCap)
+ gc.SetStrokeColor(image.Black)
+ gc.MoveTo(xc+math.Cos(startAngle)*radiusX, yc+math.Sin(startAngle)*radiusY)
+ gc.ArcTo(xc, yc, radiusX, radiusY, startAngle, angle)
+ gc.Stroke()
+
+ // fill a circle
+ gc.SetStrokeColor(color.NRGBA{255, 0x33, 0x33, 0x80})
+ gc.SetFillColor(color.NRGBA{255, 0x33, 0x33, 0x80})
+ gc.SetLineWidth(width / 20)
+
+ gc.MoveTo(xc+math.Cos(startAngle)*radiusX, yc+math.Sin(startAngle)*radiusY)
+ gc.LineTo(xc, yc)
+ gc.LineTo(xc-radiusX, yc)
+ gc.Stroke()
+
+ gc.MoveTo(xc, yc)
+ gc.ArcTo(xc, yc, width/10.0, height/10.0, 0, 2*math.Pi)
+ gc.Fill()
+}
+
+// ArcNegative draws an arc with a negative angle (anti clockwise).
+func ArcNegative(gc draw2d.GraphicContext, xc, yc, width, height float64) {
+ xc += width / 2
+ yc += height / 2
+ radiusX, radiusY := width/2, height/2
+ startAngle := 45.0 * (math.Pi / 180.0) /* angles are specified */
+ angle := -225 * (math.Pi / 180.0) /* clockwise in radians */
+ gc.SetLineWidth(width / 10)
+ gc.SetLineCap(draw2d.ButtCap)
+ gc.SetStrokeColor(image.Black)
+
+ gc.ArcTo(xc, yc, radiusX, radiusY, startAngle, angle)
+ gc.Stroke()
+ // fill a circle
+ gc.SetStrokeColor(color.NRGBA{255, 0x33, 0x33, 0x80})
+ gc.SetFillColor(color.NRGBA{255, 0x33, 0x33, 0x80})
+ gc.SetLineWidth(width / 20)
+
+ gc.MoveTo(xc+math.Cos(startAngle)*radiusX, yc+math.Sin(startAngle)*radiusY)
+ gc.LineTo(xc, yc)
+ gc.LineTo(xc-radiusX, yc)
+ gc.Stroke()
+
+ gc.ArcTo(xc, yc, width/10.0, height/10.0, 0, 2*math.Pi)
+ gc.Fill()
+}
+
+// CubicCurve draws a cubic curve with its control points.
+func CubicCurve(gc draw2d.GraphicContext, x, y, width, height float64) {
+ sx, sy := width/162, height/205
+ x0, y0 := x, y+sy*100.0
+ x1, y1 := x+sx*75, y+sy*205
+ x2, y2 := x+sx*125, y
+ x3, y3 := x+sx*205, y+sy*100
+
+ gc.SetStrokeColor(image.Black)
+ gc.SetFillColor(color.NRGBA{0xAA, 0xAA, 0xAA, 0xFF})
+ gc.SetLineWidth(width / 10)
+ gc.MoveTo(x0, y0)
+ gc.CubicCurveTo(x1, y1, x2, y2, x3, y3)
+ gc.Stroke()
+
+ gc.SetStrokeColor(color.NRGBA{0xFF, 0x33, 0x33, 0x88})
+
+ gc.SetLineWidth(width / 20)
+ // draw segment of curve
+ gc.MoveTo(x0, y0)
+ gc.LineTo(x1, y1)
+ gc.LineTo(x2, y2)
+ gc.LineTo(x3, y3)
+ gc.Stroke()
+}
+
+// FillString draws a filled and stroked string.
+func FillString(gc draw2d.GraphicContext, x, y, width, height float64) {
+ sx, sy := width/100, height/100
+ gc.Save()
+ gc.SetStrokeColor(image.Black)
+ gc.SetLineWidth(1)
+ draw2dkit.RoundedRectangle(gc, x+sx*5, y+sy*5, x+sx*95, y+sy*95, sx*10, sy*10)
+ gc.FillStroke()
+ gc.SetFillColor(image.Black)
+ gc.SetFontSize(height / 6)
+ gc.Translate(x+sx*6, y+sy*52)
+ gc.SetFontData(draw2d.FontData{
+ Name: "luxi",
+ Family: draw2d.FontFamilyMono,
+ Style: draw2d.FontStyleBold | draw2d.FontStyleItalic})
+ w := gc.FillString("Hug")
+ gc.Translate(w+sx, 0)
+ left, top, right, bottom := gc.GetStringBounds("cou")
+ gc.SetStrokeColor(color.NRGBA{255, 0x33, 0x33, 0x80})
+ draw2dkit.Rectangle(gc, left, top, right, bottom)
+ gc.SetLineWidth(height / 50)
+ gc.Stroke()
+ gc.SetFillColor(color.NRGBA{0x33, 0x33, 0xff, 0xff})
+ gc.SetStrokeColor(color.NRGBA{0x33, 0x33, 0xff, 0xff})
+ gc.SetLineWidth(height / 100)
+ gc.StrokeString("Hug")
+ gc.Restore()
+}
+
+// FillStroke first fills and afterwards strokes a path.
+func FillStroke(gc draw2d.GraphicContext, x, y, width, height float64) {
+ sx, sy := width/210, height/215
+ gc.MoveTo(x+sx*113.0, y)
+ gc.LineTo(x+sx*215.0, y+sy*215)
+ rLineTo(gc, sx*-100, 0)
+ gc.CubicCurveTo(x+sx*35, y+sy*215, x+sx*35, y+sy*113, x+sx*113.0, y+sy*113)
+ gc.Close()
+
+ gc.MoveTo(x+sx*50.0, y)
+ rLineTo(gc, sx*51.2, sy*51.2)
+ rLineTo(gc, sx*-51.2, sy*51.2)
+ rLineTo(gc, sx*-51.2, sy*-51.2)
+ gc.Close()
+
+ gc.SetLineWidth(width / 20.0)
+ gc.SetFillColor(color.NRGBA{0, 0, 0xFF, 0xFF})
+ gc.SetStrokeColor(image.Black)
+ gc.FillStroke()
+}
+
+func rLineTo(path draw2d.PathBuilder, x, y float64) {
+ x0, y0 := path.LastPoint()
+ path.LineTo(x0+x, y0+y)
+}
+
+// FillStyle demonstrates the difference between even odd and non zero winding rule.
+func FillStyle(gc draw2d.GraphicContext, x, y, width, height float64) {
+ sx, sy := width/232, height/220
+ gc.SetLineWidth(width / 40)
+
+ draw2dkit.Rectangle(gc, x+sx*0, y+sy*12, x+sx*232, y+sy*70)
+
+ var wheel1, wheel2 draw2d.Path
+ wheel1.ArcTo(x+sx*52, y+sy*70, sx*40, sy*40, 0, 2*math.Pi)
+ wheel2.ArcTo(x+sx*180, y+sy*70, sx*40, sy*40, 0, -2*math.Pi)
+
+ gc.SetFillRule(draw2d.FillRuleEvenOdd)
+ gc.SetFillColor(color.NRGBA{0, 0xB2, 0, 0xFF})
+
+ gc.SetStrokeColor(image.Black)
+ gc.FillStroke(&wheel1, &wheel2)
+
+ draw2dkit.Rectangle(gc, x, y+sy*140, x+sx*232, y+sy*198)
+ wheel1.Clear()
+ wheel1.ArcTo(x+sx*52, y+sy*198, sx*40, sy*40, 0, 2*math.Pi)
+ wheel2.Clear()
+ wheel2.ArcTo(x+sx*180, y+sy*198, sx*40, sy*40, 0, -2*math.Pi)
+
+ gc.SetFillRule(draw2d.FillRuleWinding)
+ gc.SetFillColor(color.NRGBA{0, 0, 0xE5, 0xFF})
+ gc.FillStroke(&wheel1, &wheel2)
+}
+
+// PathTransform scales a path differently in horizontal and vertical direction.
+func PathTransform(gc draw2d.GraphicContext, x, y, width, height float64) {
+ gc.Save()
+ gc.SetLineWidth(width / 10)
+ gc.Translate(x+width/2, y+height/2)
+ gc.Scale(1, 4)
+ gc.ArcTo(0, 0, width/8, height/8, 0, math.Pi*2)
+ gc.Close()
+ gc.Stroke()
+ gc.Restore()
+}
+
+// Star draws many lines from a center.
+func Star(gc draw2d.GraphicContext, x, y, width, height float64) {
+ gc.Save()
+ gc.Translate(x+width/2, y+height/2)
+ gc.SetLineWidth(width / 40)
+ for i := 0.0; i < 360; i = i + 10 { // Go from 0 to 360 degrees in 10 degree steps
+ gc.Save() // Keep rotations temporary
+ gc.Rotate(i * (math.Pi / 180.0)) // Rotate by degrees on stack from 'for'
+ gc.MoveTo(0, 0)
+ gc.LineTo(width/2, 0)
+ gc.Stroke()
+ gc.Restore()
+ }
+ gc.Restore()
+}
+
+// Draw all figures in a nice 4x3 grid.
+func Draw(gc draw2d.GraphicContext, width, height float64) {
+ mx, my := width*0.025, height*0.025 // margin
+ dx, dy := (width-2*mx)/4, (height-2*my)/3
+ w, h := dx-2*mx, dy-2*my
+ x0, y := 2*mx, 2*my
+ x := x0
+ Bubble(gc, x, y, w, h)
+ x += dx
+ CurveRectangle(gc, x, y, w, h, color.NRGBA{0x80, 0, 0, 0x80}, color.NRGBA{0x80, 0x80, 0xFF, 0xFF})
+ x += dx
+ Dash(gc, x, y, w, h)
+ x += dx
+ Arc(gc, x, y, w, h)
+ x = x0
+ y += dy
+ ArcNegative(gc, x, y, w, h)
+ x += dx
+ CubicCurve(gc, x, y, w, h)
+ x += dx
+ FillString(gc, x, y, w, h)
+ x += dx
+ FillStroke(gc, x, y, w, h)
+ x = x0
+ y += dy
+ FillStyle(gc, x, y, w, h)
+ x += dx
+ PathTransform(gc, x, y, w, h)
+ x += dx
+ Star(gc, x, y, w, h)
+ x += dx
+ gopher2.Draw(gc, x, y, w, h/2)
+}