func drawMoon(canvas gxui.Canvas, center math.Point, radius float32) {
c := 40
p := make(gxui.Polygon, c*2)
for i := 0; i < c; i++ {
frac := float32(i) / float32(c)
α := math.Lerpf(math.Pi*1.2, math.Pi*-0.2, frac)
p[i] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(radius*math.Sinf(α)),
Y: center.Y + int(radius*math.Cosf(α)),
},
RoundedRadius: 0,
}
}
for i := 0; i < c; i++ {
frac := float32(i) / float32(c)
α := math.Lerpf(math.Pi*-0.2, math.Pi*1.2, frac)
r := math.Lerpf(radius, radius*0.5, math.Sinf(frac*math.Pi))
p[i+c] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(r*math.Sinf(α)),
Y: center.Y + int(r*math.Cosf(α)),
},
RoundedRadius: 0,
}
}
canvas.DrawPolygon(p, gxui.CreatePen(3, gxui.Gray80), gxui.CreateBrush(gxui.Gray40))
}
func (a *customAdapter) Create(theme gxui.Theme, index int) gxui.Control {
phase := float32(index) / 1000
c := gxui.Color{
R: 0.5 + 0.5*math.Sinf(math.TwoPi*(phase+0.000)),
G: 0.5 + 0.5*math.Sinf(math.TwoPi*(phase+0.333)),
B: 0.5 + 0.5*math.Sinf(math.TwoPi*(phase+0.666)),
A: 1.0,
}
i := theme.CreateImage()
i.SetBackgroundBrush(gxui.CreateBrush(c))
i.SetMargin(math.Spacing{L: 3, T: 3, R: 3, B: 3})
i.OnMouseEnter(func(ev gxui.MouseEvent) {
i.SetBorderPen(gxui.CreatePen(2, gxui.Gray80))
})
i.OnMouseExit(func(ev gxui.MouseEvent) {
i.SetBorderPen(gxui.TransparentPen)
})
i.OnMouseDown(func(ev gxui.MouseEvent) {
i.SetBackgroundBrush(gxui.CreateBrush(c.MulRGB(0.7)))
})
i.OnMouseUp(func(ev gxui.MouseEvent) {
i.SetBackgroundBrush(gxui.CreateBrush(c))
})
return i
}
func drawStar(canvas gxui.Canvas, center math.Point, radius, rotation float32, points int) {
p := make(gxui.Polygon, points*2)
for i := 0; i < points*2; i++ {
frac := float32(i) / float32(points*2)
α := frac*math.TwoPi + rotation
r := []float32{radius, radius / 2}[i&1]
p[i] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(r*math.Cosf(α)),
Y: center.Y + int(r*math.Sinf(α)),
},
RoundedRadius: []float32{0, 50}[i&1],
}
}
canvas.DrawPolygon(p, gxui.CreatePen(3, gxui.Red), gxui.CreateBrush(gxui.Yellow))
}