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examples/lines: more dynaic effect

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This commit is contained in:
Hajime Hoshi 2022-10-14 23:26:15 +09:00
parent 225bf1bbb4
commit 596efc86fe
1 changed files with 8 additions and 6 deletions
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14
examples/lines/main.go
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@ -133,14 +133,16 @@ func (g *Game) drawLine(screen *ebiten.Image, region image.Rectangle, join vecto
c1x := float64(region.Max.X - region.Dx()/4)
c1y := float64(region.Max.Y - region.Dy()/4)
r := float64(min(region.Dx(), region.Dy()) / 4)
a := 2 * math.Pi * float64(g.counter) / (10 * ebiten.DefaultTPS)
a0 := 2 * math.Pi * float64(g.counter) / (16 * ebiten.DefaultTPS)
a1 := 2 * math.Pi * float64(g.counter) / (9 * ebiten.DefaultTPS)
var path vector.Path
sin, cos := math.Sincos(a)
path.MoveTo(float32(r*cos+c0x), float32(r*sin+c0y))
path.LineTo(float32(-r*cos+c0x), float32(-r*sin+c0y))
path.LineTo(float32(r*cos+c1x), float32(r*sin+c1y))
path.LineTo(float32(-r*cos+c1x), float32(-r*sin+c1y))
sin0, cos0 := math.Sincos(a0)
sin1, cos1 := math.Sincos(a1)
path.MoveTo(float32(r*cos0+c0x), float32(r*sin0+c0y))
path.LineTo(float32(-r*cos0+c0x), float32(-r*sin0+c0y))
path.LineTo(float32(r*cos1+c1x), float32(r*sin1+c1y))
path.LineTo(float32(-r*cos1+c1x), float32(-r*sin1+c1y))
// Draw the main line in white.
op := &vector.StrokeOptions{}