mirror of
https://github.com/genxium/DelayNoMore
synced 2024-12-26 03:39:00 +00:00
67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
package main
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import (
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"image/color"
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"math"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/ebitenutil"
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"github.com/solarlune/resolv"
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)
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var circleBuffer map[resolv.Shape]*ebiten.Image = map[resolv.Shape]*ebiten.Image{}
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func DrawPolygon(screen *ebiten.Image, shape *resolv.ConvexPolygon, color color.Color) {
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verts := shape.Transformed()
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for i := 0; i < len(verts); i++ {
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vert := verts[i]
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next := verts[0]
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if i < len(verts)-1 {
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next = verts[i+1]
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}
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ebitenutil.DrawLine(screen, vert.X(), vert.Y(), next.X(), next.Y(), color)
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}
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}
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func DrawCircle(screen *ebiten.Image, circle *resolv.Circle, drawColor color.Color) {
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// Actually drawing the circles live is too inefficient, so we will simply draw them to an image and then draw that instead
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// when necessary.
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if _, exists := circleBuffer[circle]; !exists {
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newImg := ebiten.NewImage(int(circle.Radius)*2, int(circle.Radius)*2)
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newImg.Set(int(circle.X), int(circle.Y), color.White)
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stepCount := float64(32)
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// Half image width and height.
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hw := circle.Radius
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hh := circle.Radius
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for i := 0; i < int(stepCount); i++ {
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x := (math.Sin(math.Pi*2*float64(i)/stepCount) * (circle.Radius - 2)) + hw
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y := (math.Cos(math.Pi*2*float64(i)/stepCount) * (circle.Radius - 2)) + hh
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x2 := (math.Sin(math.Pi*2*float64(i+1)/stepCount) * (circle.Radius - 2)) + hw
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y2 := (math.Cos(math.Pi*2*float64(i+1)/stepCount) * (circle.Radius - 2)) + hh
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ebitenutil.DrawLine(newImg, x, y, x2, y2, color.White)
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}
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circleBuffer[circle] = newImg
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}
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drawOpt := &ebiten.DrawImageOptions{}
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r, g, b, _ := drawColor.RGBA()
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drawOpt.ColorM.Scale(float64(r)/65535, float64(g)/65535, float64(b)/65535, 1)
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drawOpt.GeoM.Translate(circle.X-circle.Radius, circle.Y-circle.Radius)
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screen.DrawImage(circleBuffer[circle], drawOpt)
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}
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