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main.go
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main.go
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// transform tests affine transforms
package main
import (
"flag"
"image/color"
"io"
"math"
"os"
"gioui.org/app"
"gioui.org/unit"
gc "github.com/ajstarks/giocanvas"
)
func transforms(w *app.Window) error {
var midx, rectw, recth, recty, ts, ts2 float32
midx = 50
rectw = 40
recth = rectw / 4
ts = 5
ts2 = ts / 3
textcolor := color.NRGBA{0, 0, 0, 255}
for {
e := w.Event()
switch e := e.(type) {
case app.DestroyEvent:
return e.Err
case app.FrameEvent:
canvas := gc.NewCanvas(float32(e.Size.X), float32(e.Size.Y), app.FrameEvent{})
recty = 90
canvas.CenterRect(midx, recty, rectw, recth, color.NRGBA{128, 128, 128, 128})
canvas.TextMid(midx, recty-ts2, ts, "Reference", textcolor)
recty = 70
stack := canvas.Scale(midx, recty, 2)
canvas.CenterRect(midx, recty, rectw, recth, color.NRGBA{0, 0, 128, 128})
canvas.TextMid(midx, recty-ts2, ts, "scale", textcolor)
gc.EndTransform(stack)
recty = 50
stack = canvas.Shear(midx, midx, math.Pi/4, 0)
canvas.CenterRect(midx, recty, rectw, recth, color.NRGBA{128, 0, 0, 128})
canvas.TextMid(midx, recty-ts2, ts, "shear", textcolor)
gc.EndTransform(stack)
stack = canvas.Translate(20, 85)
canvas.CenterRect(midx, recty, rectw, recth, color.NRGBA{0, 128, 0, 128})
canvas.TextMid(midx, recty-ts2, ts, "translate", textcolor)
gc.EndTransform(stack)
recty = 20
stack = canvas.Rotate(midx, recty, math.Pi/4)
canvas.CenterRect(midx, recty, rectw, recth, color.NRGBA{255, 50, 0, 200})
canvas.TextMid(midx, recty-ts2, ts, "rotate", textcolor)
gc.EndTransform(stack)
e.Frame(canvas.Context.Ops)
}
}
}
func main() {
var cw, ch int
flag.IntVar(&cw, "width", 1000, "canvas width")
flag.IntVar(&ch, "height", 1000, "canvas height")
flag.Parse()
width := float32(cw)
height := float32(ch)
go func() {
w := &app.Window{}
w.Option(app.Title("transform"), app.Size(unit.Dp(width), unit.Dp(height)))
if err := transforms(w); err != nil {
io.WriteString(os.Stderr, "Cannot create the window\n")
os.Exit(1)
}
os.Exit(0)
}()
app.Main()
}