func newRasterPlay() *rasterPlay {
obj := new(rasterPlay)
obj.points = make([]rpoint, 0, 100) // expansion later
obj.moved = make(chan moveEvent)
obj.raster.SetFill(&image.Uniform{image.AlphaMultiply(blue, 0x8000)})
obj.c = canvas.NewCanvas(nil, cvs.Bbox())
obj.colValue = values.NewValue(nil)
obj.colValue.Set(image.Black)
obj.HandlerItem = obj.c
obj.c.AddItem(&obj.raster)
go obj.listener()
return obj
}
func sliderProc() {
val := values.NewValue(float64(0.0), nil)
window.AddItem(canvas.NewSlider(image.Rect(10, 10, 100, 40), image.White, blue, val))
window.AddItem(canvas.NewSlider(image.Rect(15, 35, 100, 70), image.White, setAlpha(red, 128), val))
window.Flush()
rval := values.Transform(val, values.UnitFloat64ToRangedFloat64(0.001e9, 0.1e9))
timeText := canvas.NewText(
image.Pt(10, 80), canvas.N|canvas.W, "", defaultFont(), 12, values.Transform(rval, values.Float64Multiply(1e-6).Combine(values.Float64ToString("%6.2gms", "%gms"))))
window.AddItem(timeText)
g := rval.Getter()
for {
x, ok := g.Get()
if !ok {
break
}
sleepTime = time.Duration(x.(float64))
}
}
func (obj *rasterPlay) AddPoint(new bool, p image.Point) {
value := values.NewValue(p)
cp := NewControlPoint(value, obj.colValue)
n := len(obj.points)
obj.points = obj.points[0 : n+1]
obj.points[n] = rpoint{new, pixel2fixPoint(p)}
go func() {
for xp := range value.Iter() {
obj.moved <- moveEvent{n, xp.(image.Point)}
}
}()
obj.c.Atomically(func(flush canvas.FlushFunc) {
r := obj.raster.Bbox()
obj.makeOutline()
flush(r, nil)
flush(obj.raster.Bbox(), nil)
})
obj.c.AddItem(cp)
}