org.rsmod.game.pathfinder.collision.CollisionStrategies.kt Maven / Gradle / Ivy

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A custom BFS pathfinder implementation to emulate RS.
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@file:Suppress("unused")

package org.rsmod.game.pathfinder.collision

import org.rsmod.game.pathfinder.flag.CollisionFlag

public object CollisionStrategies {

    @Deprecated(
        message = "Use CollisionStrategies.LineOfSight instead.",
        replaceWith = ReplaceWith("CollisionStrategies.LineOfSight")
    )
    public val Fly: CollisionStrategy = LineOfSight

    public object Normal : CollisionStrategy {

        override fun canMove(tileFlag: Int, blockFlag: Int): Boolean {
            return (tileFlag and blockFlag) == 0
        }
    }

    public object Blocked : CollisionStrategy {

        override fun canMove(tileFlag: Int, blockFlag: Int): Boolean {
            val flag = blockFlag and CollisionFlag.FLOOR.inv()
            return (tileFlag and flag) == 0 && (tileFlag and CollisionFlag.FLOOR) != 0
        }
    }

    public object Indoors : CollisionStrategy {

        override fun canMove(tileFlag: Int, blockFlag: Int): Boolean {
            return (tileFlag and blockFlag) == 0 && (tileFlag and CollisionFlag.ROOF) != 0
        }
    }

    public object Outdoors : CollisionStrategy {

        override fun canMove(tileFlag: Int, blockFlag: Int): Boolean {
            return (tileFlag and (blockFlag or CollisionFlag.ROOF)) == 0
        }
    }

    public object LineOfSight : CollisionStrategy {

        private const val BLOCK_MOVEMENT = CollisionFlag.WALL_NORTH_WEST or
            CollisionFlag.WALL_NORTH or
            CollisionFlag.WALL_NORTH_EAST or
            CollisionFlag.WALL_EAST or
            CollisionFlag.WALL_SOUTH_EAST or
            CollisionFlag.WALL_SOUTH or
            CollisionFlag.WALL_SOUTH_WEST or
            CollisionFlag.WALL_WEST or
            CollisionFlag.OBJECT

        private const val BLOCK_ROUTE = CollisionFlag.WALL_NORTH_WEST_ROUTE_BLOCKER or
            CollisionFlag.WALL_NORTH_ROUTE_BLOCKER or
            CollisionFlag.WALL_NORTH_EAST_ROUTE_BLOCKER or
            CollisionFlag.WALL_EAST_ROUTE_BLOCKER or
            CollisionFlag.WALL_SOUTH_EAST_ROUTE_BLOCKER or
            CollisionFlag.WALL_SOUTH_ROUTE_BLOCKER or
            CollisionFlag.WALL_SOUTH_WEST_ROUTE_BLOCKER or
            CollisionFlag.WALL_WEST_ROUTE_BLOCKER or
            CollisionFlag.OBJECT_ROUTE_BLOCKER

        override fun canMove(tileFlag: Int, blockFlag: Int): Boolean {
            val movementFlags = (blockFlag and BLOCK_MOVEMENT) shl 9
            val routeFlags = (blockFlag and BLOCK_ROUTE) shr 13
            val finalBlockFlag = movementFlags or routeFlags
            return (tileFlag and finalBlockFlag) == 0
        }
    }
}