/
canvas.go
54 lines (47 loc) · 1.58 KB
/
canvas.go
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package tutorials
import (
"image/color"
"time"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/canvas"
"fyne.io/fyne/v2/cmd/fyne_demo/data"
"fyne.io/fyne/v2/container"
)
func rgbGradient(x, y, w, h int) color.Color {
g := int(float32(x) / float32(w) * float32(255))
b := int(float32(y) / float32(h) * float32(255))
return color.NRGBA{uint8(255 - b), uint8(g), uint8(b), 0xff}
}
// canvasScreen loads a graphics example panel for the demo app
func canvasScreen(_ fyne.Window) fyne.CanvasObject {
gradient := canvas.NewHorizontalGradient(color.NRGBA{0x80, 0, 0, 0xff}, color.NRGBA{0, 0x80, 0, 0xff})
go func() {
for {
time.Sleep(time.Second)
gradient.Angle += 45
if gradient.Angle >= 360 {
gradient.Angle -= 360
}
canvas.Refresh(gradient)
}
}()
return container.NewGridWrap(fyne.NewSize(90, 90),
canvas.NewImageFromResource(data.FyneLogo),
&canvas.Rectangle{FillColor: color.NRGBA{0x80, 0, 0, 0xff},
StrokeColor: color.NRGBA{R: 255, G: 120, B: 0, A: 255},
StrokeWidth: 1},
&canvas.Rectangle{
FillColor: color.NRGBA{R: 255, G: 200, B: 0, A: 180},
StrokeColor: color.NRGBA{R: 255, G: 120, B: 0, A: 255},
StrokeWidth: 4.0,
CornerRadius: 20},
&canvas.Line{StrokeColor: color.NRGBA{0, 0, 0x80, 0xff}, StrokeWidth: 5},
&canvas.Circle{StrokeColor: color.NRGBA{0, 0, 0x80, 0xff},
FillColor: color.NRGBA{0x30, 0x30, 0x30, 0x60},
StrokeWidth: 2},
canvas.NewText("Text", color.NRGBA{0, 0x80, 0, 0xff}),
canvas.NewRasterWithPixels(rgbGradient),
gradient,
canvas.NewRadialGradient(color.NRGBA{0x80, 0, 0, 0xff}, color.NRGBA{0, 0x80, 0x80, 0xff}),
)
}