func (p *Power) next(root *graph, visited map[node]bool, dx, dy int, t tile.Type) {
coord := layout.C(root.X+dx, root.Y+dy)
tiles := p.l.Get(coord)
for _, tt := range tiles {
d, ok := p.l.TileSet.Get(tt).(Def)
if !ok {
continue
}
if t2 := tt.Type(p.l.TileSet); t.Equal(t2) || t2.Equal(t) {
n := node{coord, tt}
if visited[n] {
return
}
visited[n] = true
g := &graph{
node: n,
emit: d.PowerGenerated(p.l.TileSet),
used: d.PowerUsage(p.l.TileSet),
}
root.neighbors = append(root.neighbors, g)
p.visit(g, visited)
return
}
}
}
func (p *Power) get(x, y int, t tile.Tile) bool {
return p.powered[node{layout.C(x, y), t}]
}