mirror of
https://github.com/genxium/DelayNoMore
synced 2024-12-26 03:39:00 +00:00
53 lines
1.0 KiB
Go
53 lines
1.0 KiB
Go
package main
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import (
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/solarlune/resolv"
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"image/color"
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)
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var (
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PolygonFillerImage = ebiten.NewImage(1, 1)
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)
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func DrawPolygon(screen *ebiten.Image, shape *resolv.ConvexPolygon, clr color.Color) {
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PolygonFillerImage.Fill(clr)
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indices := []uint16{}
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vs := []ebiten.Vertex{}
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coors := shape.Transformed()
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centerX := float64(0)
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centerY := float64(0)
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n := uint16(len(coors))
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for i, coor := range coors {
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centerX += coor.X()
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centerY += coor.Y()
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vs = append(vs, ebiten.Vertex{
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DstX: float32(coor.X()),
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DstY: float32(coor.Y()),
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SrcX: 0,
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SrcY: 0,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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})
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indices = append(indices, uint16(i), uint16(i+1)%n, n)
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}
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centerX = centerX / float64(n)
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centerY = centerY / float64(n)
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vs = append(vs, ebiten.Vertex{
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DstX: float32(centerX),
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DstY: float32(centerY),
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SrcX: 0,
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SrcY: 0,
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ColorR: 1,
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ColorG: 1,
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ColorB: 1,
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ColorA: 1,
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})
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screen.DrawTriangles(vs, indices, PolygonFillerImage, nil)
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}
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