mapgen moving to delanay -> minimum spanning tree for rooms connection

engine/gamemap/room.go

@@ -0,0 +1,85 @@
+package gamemap
+
+import (
+	"errors"
+	"lab.zaar.be/thefish/alchemyst-go/engine/items"
+	"lab.zaar.be/thefish/alchemyst-go/engine/mob"
+	"lab.zaar.be/thefish/alchemyst-go/engine/types"
+	"lab.zaar.be/thefish/alchemyst-go/util"
+)
+
+var invalidBlit = errors.New("trying to blit on existing good tile")
+
+type Room struct {
+	*types.Rect
+	Center     types.Coords
+	Geometry   []func() *Tile
+	Mobs       []mob.Mob
+	Items      []items.Carried
+	Connectors []types.Coords
+}
+
+func (r *Room) Put (x, y int, tileFunc interface{}) {
+	tf := tileFunc.(func() *Tile)
+	if tf == nil {
+		return //fixme error
+	}
+	if r.InBounds(types.Coords{x, y}) {
+		r.Geometry[x+y*r.W] = tf
+	}
+}
+
+func (room *Room) BlitToLevel(l *Level, where types.Coords) error {
+	//copy tiles like this:
+	//https://stackoverflow.com/questions/21011023/copy-pointer-values-a-b-in-golang
+
+	for j := 0; j < room.H; j++ {
+
+		for i := 0; i < room.W; i++ {
+			underlyingTile := l.GetTileByXY(i+where.X, j+where.Y)
+
+			tileFunc := room.Geometry[i+j*room.W]
+
+			if tileFunc == nil {
+				continue
+			}
+			//check underlying tile
+			if underlyingTile != nil ||
+				underlyingTile.Name != "Wall" {
+				return invalidBlit
+			}
+			l.Put(i+where.X, j+where.Y, tileFunc)
+		}
+	}
+	//update room coords?
+	room.X = where.X
+	room.Y = where.Y
+	//update connector?
+	for i, _ := range room.Connectors {
+		room.Connectors[i].X += where.X
+		room.Connectors[i].Y += where.Y
+	}
+	return nil
+}
+
+func NewRandomRectRoom(rng *util.RNG, w, h int, fillage types.RectFill) *Room {
+	newRoom := &Room{
+		Rect: types.NewRect(
+			0,
+			0,
+			w,
+			h,
+		),
+		Center: types.Coords{w / 2, h /2 },
+	}
+	newRoom.Blit(fillage, newRoom)
+	//add connectors
+	newRoom.Connectors = append(
+		newRoom.Connectors,
+		types.Coords{rng.Range(1, w - 2), 0},
+		types.Coords{rng.Range(1, w - 2), h -1},
+		types.Coords{0,  rng.Range(1, h - 2)},
+		types.Coords{w - 1,  rng.Range(1, h - 2)},
+	)
+	return newRoom
+}