animated tiles gogo

engine/tiles.go

@@ -7,7 +7,7 @@ import (
 )
 
 type Tilemap struct {
-	Map      [][]int
+	Map      [][]Tile
 	Src      *ebiten.Image // must be a horizontal tile set
 	TileSize int
 	GeoM     ebiten.GeoM
@@ -22,9 +22,55 @@ func (t *Tilemap) Draw(screen *ebiten.Image) {
 			op.GeoM.Translate(float64(i*t.TileSize), float64(j*t.TileSize))
 			op.GeoM.Concat(t.GeoM)
 
-			sx := tile * t.TileSize
+			sx := tile.TileIndex() * t.TileSize
 			src := t.Src.SubImage(image.Rect(sx, 0, sx+t.TileSize, t.TileSize)).(*ebiten.Image)
 			screen.DrawImage(src, &op)
 		}
 	}
 }
+
+func (t *Tilemap) Update() error {
+	for j := range t.Map {
+		for i := range t.Map[j] {
+			if tile, ok := t.Map[j][i].(Updater); ok {
+				if err := tile.Update(); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
+
+type Tile interface {
+	TileIndex() int
+}
+
+type StaticTile int
+
+func (s StaticTile) TileIndex() int { return int(s) }
+
+type AnimatedTile struct {
+	Frame         int // if Tile in AnimationDefs, index
+	DurationTicks int // time spent showing this frame
+	AnimDef       []TileAnimFrameDef
+}
+
+func (a *AnimatedTile) TileIndex() int { return a.AnimDef[a.Frame].Tile }
+
+func (a *AnimatedTile) Update() error {
+	a.DurationTicks++
+	if a.DurationTicks >= a.AnimDef[a.Frame].DurationTicks {
+		a.DurationTicks = 0
+		a.Frame++
+	}
+	if a.Frame >= len(a.AnimDef) {
+		a.Frame = 0
+	}
+	return nil
+}
+
+type TileAnimFrameDef struct {
+	Tile          int // show this tile
+	DurationTicks int // show it for this long
+}

main.go

@@ -29,8 +29,7 @@ func main() {
 	}
 	boxesFile.Close()
 
-	tiles := &engine.Tilemap{
-		Map: [][]int{
+	staticTiles := [][]int{
 		{0, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1},
 		{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9},
 		{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9},
@@ -46,7 +45,18 @@ func main() {
 		{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9},
 		{9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9},
 		{2, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 3},
-		},
+	}
+
+	tiles := make([][]engine.Tile, len(staticTiles))
+	for j := range staticTiles {
+		tiles[j] = make([]engine.Tile, len(staticTiles[j]))
+		for i := range staticTiles[j] {
+			tiles[j][i] = engine.StaticTile(staticTiles[j][i])
+		}
+	}
+
+	tilemap := &engine.Tilemap{
+		Map:      tiles,
 		Src:      ebiten.NewImageFromImage(boxesPNG),
 		TileSize: 16,
 	}
@@ -55,7 +65,7 @@ func main() {
 		ScreenHeight: screenHeight,
 		ScreenWidth:  screenWidth,
 		Components: []interface{}{
-			tiles,
+			tilemap,
 			engine.PerfDisplay{},
 		},
 	}