112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
package engine
|
|
|
|
import (
|
|
"encoding/gob"
|
|
"image"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2"
|
|
)
|
|
|
|
func init() {
|
|
gob.Register(AnimatedTile{})
|
|
gob.Register(StaticTile(0))
|
|
gob.Register(Tilemap{})
|
|
}
|
|
|
|
// Tilemap renders a grid of tiles.
|
|
type Tilemap struct {
|
|
Disabled bool
|
|
Hidden bool
|
|
ID
|
|
Map [][]Tile
|
|
Ersatz bool // "fake wall"
|
|
Src ImageRef
|
|
TileSize int
|
|
ZPos
|
|
}
|
|
|
|
// CollidesWith implements Collider.
|
|
func (t *Tilemap) CollidesWith(r image.Rectangle) bool {
|
|
if t.Ersatz {
|
|
return false
|
|
}
|
|
|
|
// If we round down r.Min, and round up r.Max, to the nearest tile
|
|
// coordinates, that gives the full range of tiles to test.
|
|
sm1 := t.TileSize - 1
|
|
min := r.Min.Div(t.TileSize)
|
|
max := r.Max.Add(image.Pt(sm1, sm1)).Div(t.TileSize)
|
|
|
|
for j := min.Y; j <= max.Y && j < len(t.Map); j++ {
|
|
row := t.Map[j]
|
|
for i := min.X; i <= max.X && i < len(row); i++ {
|
|
if row[i] == nil {
|
|
continue
|
|
}
|
|
if r.Overlaps(image.Rect(i*t.TileSize, j*t.TileSize, (i+1)*t.TileSize, (j+1)*t.TileSize)) {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Draw draws the tilemap.
|
|
func (t *Tilemap) Draw(screen *ebiten.Image, geom ebiten.GeoM) {
|
|
if t.Hidden {
|
|
return
|
|
}
|
|
src := t.Src.Image()
|
|
w, _ := src.Size()
|
|
for j, row := range t.Map {
|
|
for i, tile := range row {
|
|
if tile == nil {
|
|
continue
|
|
}
|
|
var op ebiten.DrawImageOptions
|
|
op.GeoM.Translate(float64(i*t.TileSize), float64(j*t.TileSize))
|
|
op.GeoM.Concat(geom)
|
|
|
|
s := tile.TileIndex() * t.TileSize
|
|
sx, sy := s%w, (s/w)*t.TileSize
|
|
src := src.SubImage(image.Rect(sx, sy, sx+t.TileSize, sy+t.TileSize)).(*ebiten.Image)
|
|
screen.DrawImage(src, &op)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Update calls Update on any tiles that are Updaters, e.g. AnimatedTile.
|
|
func (t *Tilemap) Update() error {
|
|
if t.Disabled {
|
|
return nil
|
|
}
|
|
for _, row := range t.Map {
|
|
for _, tile := range row {
|
|
if u, ok := tile.(Updater); ok {
|
|
if err := u.Update(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Tile is the interface needed by Tilemap.
|
|
type Tile interface {
|
|
TileIndex() int
|
|
}
|
|
|
|
// StaticTile returns a fixed tile index.
|
|
type StaticTile int
|
|
|
|
func (s StaticTile) TileIndex() int { return int(s) }
|
|
|
|
// AnimatedTile uses an Anim to choose a tile index.
|
|
type AnimatedTile struct {
|
|
AnimRef
|
|
}
|
|
|
|
func (a *AnimatedTile) TileIndex() int { return a.Anim().CurrentFrame() }
|
|
|
|
func (a *AnimatedTile) Update() error { return a.Anim().Update() }
|