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examples/isometric: Refactoring

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This commit is contained in:
Hajime Hoshi 2021-10-01 11:51:25 +09:00
parent 2f33366f5f
commit b78aef480e
1 changed files with 4 additions and 3 deletions
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7
examples/isometric/game.go
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@ -180,6 +180,8 @@ func (g *Game) isoToCartesian(x, y float64) (float64, float64) {
// renderLevel draws the current Level on the screen.
func (g *Game) renderLevel(screen *ebiten.Image) {
op := &ebiten.DrawImageOptions{}
padding := float64(g.currentLevel.tileSize) * g.camScale
cx, cy := float64(g.w/2), float64(g.h/2)
var t *Tile
for y := 0; y < g.currentLevel.h; y++ {
@ -187,8 +189,7 @@ func (g *Game) renderLevel(screen *ebiten.Image) {
xi, yi := g.cartesianToIso(float64(x), float64(y))
// Skip drawing off-screen tiles.
padding := float64(g.currentLevel.tileSize) * g.camScale
drawX, drawY := ((xi-g.camX)*g.camScale)+float64(g.w/2.0), ((yi+g.camY)*g.camScale)+float64(g.h/2.0)
drawX, drawY := ((xi-g.camX)*g.camScale)+cx, ((yi+g.camY)*g.camScale)+cy
if drawX+padding < 0 || drawY+padding < 0 || drawX > float64(g.w) || drawY > float64(g.h) {
continue
}
@ -206,7 +207,7 @@ func (g *Game) renderLevel(screen *ebiten.Image) {
// Zoom.
op.GeoM.Scale(g.camScale, g.camScale)
// Center.
op.GeoM.Translate(float64(g.w/2.0), float64(g.h/2.0))
op.GeoM.Translate(cx, cy)
t.Draw(screen, op)
}