func generatePie(params PieParams) image.Image {
img := image.NewRGBA(image.Rect(0, 0, params.size, params.size))
progressColor := progressColors[params.color]
halfWidth := float64(params.size) * 0.5
strokeWidth := math.Floor(halfWidth * 0.1)
circleSize := halfWidth * 0.94
arcAngle := 6.283185 // 2 * math.Pi
gc := draw2dimg.NewGraphicContext(img)
gc.BeginPath()
gc.SetStrokeColor(progressColor)
gc.SetFillColor(white)
gc.SetLineWidth(strokeWidth)
gc.ArcTo(halfWidth, halfWidth, circleSize, circleSize, arcAngle, arcAngle)
gc.Close()
gc.FillStroke()
startAngle := 270 * (math.Pi / 180.0)
angle := (360 * (float64(params.progress) * 0.01)) * (math.Pi / 180.0)
gc.SetFillColor(progressColor)
gc.BeginPath()
gc.MoveTo(halfWidth, halfWidth)
gc.ArcTo(halfWidth, halfWidth, circleSize, circleSize, startAngle, angle)
gc.Close()
gc.Fill()
return img
}
func generateImage(params Params) image.Image {
fgColor := white
var detectedFont *truetype.Font
if []rune(params.text)[0] > '\u2E7F' {
detectedFont = cjkFont
} else {
detectedFont = defaultFont
}
fontSize := float64(params.size) * 0.5
img := image.NewRGBA(image.Rect(0, 0, params.size, params.size))
if params.seed != 0 {
rand.Seed(params.seed)
}
var bgColor color.RGBA
if params.color == (color.RGBA{}) {
bgColor = colors[rand.Intn(len(colors))]
} else {
bgColor = params.color
}
if params.border {
bgColor, fgColor = fgColor, bgColor
}
draw.Draw(img, img.Bounds(), &image.Uniform{bgColor}, image.ZP, draw.Src)
if params.border {
strokeWidth := fontSize * 0.08
circleSize := fontSize * 0.92
arcAngle := math.Pi * 2
gc := draw2dimg.NewGraphicContext(img)
gc.SetStrokeColor(fgColor)
gc.SetLineWidth(strokeWidth)
gc.ArcTo(fontSize, fontSize, circleSize, circleSize, arcAngle, arcAngle)
gc.Stroke()
}
d := &font.Drawer{
Dst: img,
Src: image.NewUniform(fgColor),
Face: truetype.NewFace(detectedFont, &truetype.Options{
Size: fontSize,
DPI: 72,
}),
}
d.Dot = fixed.Point26_6{
X: (fixed.I(params.size) - d.MeasureString(params.text)) / 2,
Y: fixed.I(int(math.Ceil(fontSize * 1.35))),
}
d.DrawString(params.text)
return img
}
func test(t *testing.T, draw sample) {
// Initialize the graphic context on an RGBA image
dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
gc := draw2dimg.NewGraphicContext(dest)
// Draw Android logo
output, err := draw(gc, "png")
if err != nil {
t.Errorf("Drawing %q failed: %v", output, err)
return
}
// Save to png
err = draw2dimg.SaveToPngFile(output, dest)
if err != nil {
t.Errorf("Saving %q failed: %v", output, err)
}
}
func imgPng(w http.ResponseWriter, r *http.Request) *appError {
w.Header().Set("Content-type", "image/png")
// Initialize the graphic context on an RGBA image
dest := image.NewRGBA(image.Rect(0, 0, 297, 210.0))
gc := draw2dimg.NewGraphicContext(dest)
// Draw sample
android.Draw(gc, 65, 0)
err := png.Encode(w, dest)
if err != nil {
return &appError{err, fmt.Sprintf("Can't encode: %s", err), 500}
}
return nil
}
func TestCircle(t *testing.T) {
width := 200
height := 200
img := image.NewRGBA(image.Rect(0, 0, width, height))
gc := draw2dimg.NewGraphicContext(img)
gc.SetStrokeColor(color.NRGBA{255, 255, 255, 255})
gc.SetFillColor(color.NRGBA{255, 255, 255, 255})
gc.Clear()
gc.SetStrokeColor(color.NRGBA{255, 0, 0, 255})
gc.SetLineWidth(1)
// Draw a circle
Circle(gc, 100, 100, 50)
gc.Stroke()
draw2dimg.SaveToPngFile("../output/draw2dkit/TestCircle.png", img)
}
func generateHorseshoe(params PieParams) image.Image {
img := image.NewRGBA(image.Rect(0, 0, params.size, params.size))
progressColor := progressColors[params.color]
progressShadow := progressShadows[params.color]
halfWidth := float64(params.size / 2)
strokeWidth := float64(params.size) * 0.086
bigStrokeWidth := float64(params.size) * 0.1
circleSize := halfWidth * 0.71
bigCircleSize := float64(params.size) * 0.4
startAngle := 120 * (math.Pi / 180.0)
angle := (300 * (float64(100) * 0.01)) * (math.Pi / 180.0)
gc := draw2dimg.NewGraphicContext(img)
gc.BeginPath()
gc.SetStrokeColor(gray)
gc.SetLineWidth(strokeWidth)
gc.ArcTo(halfWidth, halfWidth, circleSize, circleSize, startAngle, angle)
gc.Stroke()
angle = (300 * (float64(params.progress) * 0.01)) * (math.Pi / 180.0)
gc.BeginPath()
gc.SetStrokeColor(progressShadow)
gc.SetLineWidth(strokeWidth)
gc.ArcTo(halfWidth, halfWidth, circleSize, circleSize, startAngle, angle)
gc.Stroke()
gc.BeginPath()
gc.SetStrokeColor(progressColor)
gc.SetLineWidth(bigStrokeWidth)
gc.ArcTo(halfWidth, halfWidth, bigCircleSize, bigCircleSize, startAngle, angle)
gc.Stroke()
return img
}
