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examples/shapes: Use DrawTriangles for rectangles (#680)

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This commit is contained in:
Hajime Hoshi 2018-09-15 19:00:57 +09:00
parent 76ca296cdd
commit e1347c58ca
1 changed files with 60 additions and 3 deletions
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63
examples/shapes/main.go
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@ -98,6 +98,60 @@ func line(x0, y0, x1, y1 float32, clr color.RGBA) ([]ebiten.Vertex, []uint16) {
}, []uint16{0, 1, 2, 1, 2, 3}
}
func rect(x, y, w, h float32, clr color.RGBA) ([]ebiten.Vertex, []uint16) {
r := float32(clr.R) / 0xff
g := float32(clr.G) / 0xff
b := float32(clr.B) / 0xff
a := float32(clr.A) / 0xff
x0 := x
y0 := y
x1 := x + w
y1 := y + h
return []ebiten.Vertex{
{
DstX: x0,
DstY: y0,
SrcX: 1,
SrcY: 1,
ColorR: r,
ColorG: g,
ColorB: b,
ColorA: a,
},
{
DstX: x1,
DstY: y0,
SrcX: 1,
SrcY: 1,
ColorR: r,
ColorG: g,
ColorB: b,
ColorA: a,
},
{
DstX: x0,
DstY: y1,
SrcX: 1,
SrcY: 1,
ColorR: r,
ColorG: g,
ColorB: b,
ColorA: a,
},
{
DstX: x1,
DstY: y1,
SrcX: 1,
SrcY: 1,
ColorR: r,
ColorG: g,
ColorB: b,
ColorA: a,
},
}, []uint16{0, 1, 2, 1, 2, 3}
}
func update(screen *ebiten.Image) error {
count++
count %= 240
@ -109,12 +163,15 @@ func update(screen *ebiten.Image) error {
cf := float64(count)
v, i := line(100, 100, 300, 100, color.RGBA{0xff, 0xff, 0xff, 0xff})
screen.DrawTriangles(v, i, emptyImage, nil)
v, i = line(50, 150, 50, 350, color.RGBA{0xff, 0xff, 0xff, 0xff})
v, i = line(50, 150, 50, 350, color.RGBA{0xff, 0xff, 0x00, 0xff})
screen.DrawTriangles(v, i, emptyImage, nil)
v, i = line(50, 100+float32(cf), 200+float32(cf), 250, color.RGBA{0x00, 0xff, 0xff, 0xff})
screen.DrawTriangles(v, i, emptyImage, nil)
ebitenutil.DrawRect(screen, 50+cf, 50+cf, 100+cf, 100+cf, color.RGBA{0x80, 0x80, 0x80, 0x80})
ebitenutil.DrawRect(screen, 300-cf, 50, 120, 120, color.RGBA{0x00, 0x80, 0x00, 0x80})
v, i = rect(50+float32(cf), 50+float32(cf), 100+float32(cf), 100+float32(cf), color.RGBA{0x80, 0x80, 0x80, 0x80})
screen.DrawTriangles(v, i, emptyImage, nil)
v, i = rect(300-float32(cf), 50, 120, 120, color.RGBA{0x00, 0x80, 0x00, 0x80})
screen.DrawTriangles(v, i, emptyImage, nil)
ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %0.2f", ebiten.CurrentFPS()))
return nil