Fixed monster z-fighting.

TODO.md

@@ -8,8 +8,8 @@
 - [ ] Change layout when playing in portrait mode.
 - [X] Fix wobble animation.
 - [ ] Add more unit tests?
-- [ ] Fix z-fighting of monsters.
-- [ ] Add exploding animation of monsters.
+- [X] Fix z-fighting of monsters.
+- [X] Add exploding animation of monsters.
 - [ ] Add audio settings (music & sound volume).
 - [X] Hearts must be saved as well for resume.
 - [ ] Add demo mode.

cmd/tins2021/levelcontroller.go

@@ -338,22 +338,29 @@ func (r levelController) Render(ctx ui.Context) {
 		renderer.DrawTexturePoint(player, playerPosition.Add(centerTopSquare))
 	}
 
-	for pos, monsterType := range r.Level.Monsters {
-		tile := r.Level.Tiles[pos]
-		if tile == nil {
-			continue
-		}
-		texture := monsterTextures[monsterType.Type()]
-		_, platformPos := positionOfTile(pos)
-		if target, ok := r.Level.MonsterTargets[pos]; ok {
-			_, targetPlatformPos := positionOfTile(target)
-			dt := float32(r.MovingMonsters.Frame(pos)) / 50.
-			delta := targetPlatformPos.Sub(platformPos)
-			curve := geom.PtF32(0, .6*geom.Sin32(dt*geom.Pi)*textureWidth)
-			interpolatedPos := platformPos.Add(delta.Mul(dt)).Sub(curve)
-			texture.Draw(renderer, interpolatedPos.Add(propOffset), r.Animations["monster"].Frame(pos))
-		} else {
-			texture.Draw(renderer, platformPos.Add(propOffset), r.Animations["monster"].Frame(pos))
+	for y := r.Level.Bounds.Min.Y; y < r.Level.Bounds.Max.Y; y++ {
+		for x := r.Level.Bounds.Min.X; x < r.Level.Bounds.Max.X; x++ {
+			pos := geom.Pt(x, y)
+			monsterType, ok := r.Level.Monsters[pos]
+			if !ok {
+				continue
+			}
+			tile := r.Level.Tiles[pos]
+			if tile == nil {
+				continue
+			}
+			texture := monsterTextures[monsterType.Type()]
+			_, platformPos := positionOfTile(pos)
+			if target, ok := r.Level.MonsterTargets[pos]; ok {
+				_, targetPlatformPos := positionOfTile(target)
+				dt := float32(r.MovingMonsters.Frame(pos)) / 50.
+				delta := targetPlatformPos.Sub(platformPos)
+				curve := geom.PtF32(0, .6*geom.Sin32(dt*geom.Pi)*textureWidth)
+				interpolatedPos := platformPos.Add(delta.Mul(dt)).Sub(curve)
+				texture.Draw(renderer, interpolatedPos.Add(propOffset), r.Animations["monster"].Frame(pos))
+			} else {
+				texture.Draw(renderer, platformPos.Add(propOffset), r.Animations["monster"].Frame(pos))
+			}
 		}
 	}