53 lines
958 B
Go
53 lines
958 B
Go
|
package ui
|
||
|
|
|
||
|
|
import (
|
||
|
|
"image"
|
||
|
|
"image/color"
|
||
|
|
|
||
|
|
"opslag.de/schobers/geom"
|
||
|
|
)
|
||
|
|
|
||
|
|
type IconPixelTestFn func(geom.PointF32) bool
|
||
|
|
|
||
|
|
func IconSize() geom.Point {
|
||
|
|
return geom.Pt(448, 512)
|
||
|
|
}
|
||
|
|
|
||
|
|
func CreateIcon(ctx Context, test IconPixelTestFn) Image {
|
||
|
|
icon := DrawIcon(test)
|
||
|
|
im, err := ctx.Renderer().CreateImage(icon)
|
||
|
|
if err != nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
return im
|
||
|
|
}
|
||
|
|
|
||
|
|
func DrawIcon(test IconPixelTestFn) image.Image {
|
||
|
|
size := IconSize()
|
||
|
|
r := image.Rect(0, 0, size.X, size.Y)
|
||
|
|
icon := image.NewRGBA(r)
|
||
|
|
for y := 0; y < size.Y; y++ {
|
||
|
|
for x := 0; x < size.X; x++ {
|
||
|
|
pt := geom.PtF32(float32(x), float32(y))
|
||
|
|
if test(pt) {
|
||
|
|
icon.Set(x, y, color.White)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return icon
|
||
|
|
}
|
||
|
|
|
||
|
|
func GetOrCreateIcon(ctx Context, name string, testFactory func() IconPixelTestFn) Image {
|
||
|
|
im := ctx.Images().Image(name)
|
||
|
|
if im != nil {
|
||
|
|
return im
|
||
|
|
}
|
||
|
|
test := testFactory()
|
||
|
|
im = CreateIcon(ctx, test)
|
||
|
|
if im == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
ctx.Images().AddImage(name, im)
|
||
|
|
return im
|
||
|
|
}
|