153 lines
3.5 KiB
Go
153 lines
3.5 KiB
Go
package engine
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import (
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"encoding/gob"
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"image"
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"github.com/hajimehoshi/ebiten/v2"
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)
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// Ensure Tilemap satisfies interfaces.
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var (
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_ Identifier = &Tilemap{}
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_ Collider = &Tilemap{}
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_ Drawer = &Tilemap{}
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_ DrawOrderer = &Tilemap{}
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_ Hider = &Tilemap{}
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_ Scanner = &Tilemap{}
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_ Updater = &Tilemap{}
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)
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func init() {
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gob.Register(&AnimatedTile{})
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gob.Register(StaticTile(0))
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gob.Register(&Tilemap{})
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}
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// Tilemap renders a grid of square tiles.
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type Tilemap struct {
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ID
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Disabled
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Hidden
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Map map[image.Point]Tile // tilespace coordinate -> tile
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Ersatz bool // "fake wall"
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Offset image.Point // world coordinates
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Src ImageRef
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TileSize int
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ZOrder
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}
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// CollidesWith implements Collider.
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func (t *Tilemap) CollidesWith(r image.Rectangle) bool {
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if t.Ersatz {
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return false
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}
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// Probe the map at all tilespace coordinates overlapping the rect.
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r = r.Sub(t.Offset)
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min := r.Min.Div(t.TileSize)
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max := r.Max.Sub(image.Pt(1, 1)).Div(t.TileSize) // NB: fencepost
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for j := min.Y; j <= max.Y; j++ {
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for i := min.X; i <= max.X; i++ {
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if t.Map[image.Pt(i, j)] != nil {
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return true
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}
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}
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}
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return false
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}
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// Draw draws the tilemap.
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func (t *Tilemap) Draw(screen *ebiten.Image, opts ebiten.DrawImageOptions) {
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if t.Hidden {
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return
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}
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src := t.Src.Image()
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w, _ := src.Size()
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og := opts.GeoM
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var geom ebiten.GeoM
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for p, tile := range t.Map {
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if tile == nil {
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continue
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}
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geom.Reset()
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geom.Translate(float64(p.X*t.TileSize+t.Offset.X), float64(p.Y*t.TileSize+t.Offset.Y))
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geom.Concat(og)
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opts.GeoM = geom
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s := tile.TileIndex() * t.TileSize
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sx, sy := s%w, (s/w)*t.TileSize
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src := src.SubImage(image.Rect(sx, sy, sx+t.TileSize, sy+t.TileSize)).(*ebiten.Image)
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screen.DrawImage(src, &opts)
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}
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}
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// Scan returns a slice containing Src and all non-nil tiles.
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func (t *Tilemap) Scan() []interface{} {
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c := make([]interface{}, 1, len(t.Map)+1)
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c[0] = &t.Src
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for _, tile := range t.Map {
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c = append(c, tile)
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}
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return c
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}
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// Update calls Update on any tiles that are Updaters, e.g. AnimatedTile.
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func (t *Tilemap) Update() error {
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if t.Disabled {
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return nil
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}
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for _, tile := range t.Map {
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if u, ok := tile.(Updater); ok {
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if err := u.Update(); err != nil {
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return err
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}
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}
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}
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return nil
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}
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// TileAt returns the tile present at the given world coordinate.
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func (t *Tilemap) TileAt(wc image.Point) Tile {
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return t.Map[wc.Sub(t.Offset).Div(t.TileSize)]
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}
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// SetTileAt sets the tile at the given world coordinate.
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func (t *Tilemap) SetTileAt(wc image.Point, tile Tile) {
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t.Map[wc.Sub(t.Offset).Div(t.TileSize)] = tile
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}
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// TileBounds returns a rectangle describing the tile boundary for the tile
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// at the given world coordinate.
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func (t *Tilemap) TileBounds(wc image.Point) image.Rectangle {
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p := wc.Sub(t.Offset).Div(t.TileSize).Mul(t.TileSize).Add(t.Offset)
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return image.Rectangle{p, p.Add(image.Pt(t.TileSize, t.TileSize))}
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}
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// Tile is the interface needed by Tilemap.
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type Tile interface {
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TileIndex() int
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}
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// Ensure StaticTile and AnimatedTile satisfy Tile.
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var (
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_ Tile = StaticTile(0)
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_ Tile = AnimatedTile{}
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_ Scanner = AnimatedTile{}
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)
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// StaticTile returns a fixed tile index.
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type StaticTile int
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func (s StaticTile) TileIndex() int { return int(s) }
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// AnimatedTile uses an Anim to choose a tile index.
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type AnimatedTile struct {
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Animer
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}
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func (a AnimatedTile) TileIndex() int { return a.CurrentFrame() }
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// Scan returns a.Animer. (It could be a Loader.)
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func (a AnimatedTile) Scan() []interface{} { return []interface{}{a.Animer} }
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