Android Open Source - Station42 Wall Collision System

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUC...

Java Source Code

package com.station42.world;
//from  ww w.  j av  a2  s.c o m
import com.badlogic.gdx.math.Intersector;
import com.badlogic.gdx.math.Rectangle;
import com.station42.base.Engine;
import com.station42.base.EngineUpdateListener;
import com.station42.base.Entity;
import com.station42.basic.EntityLocation;
import com.station42.player.move.EntityMoveState;

public class WallCollisionSystem implements EngineUpdateListener {
  Rectangle temp = new Rectangle();
  @Override
  public void update(Engine engine, float delta) {
    for (Entity wallEntity : engine.getEntitiesWithComponent(Wall.class)) {
      Wall wall = wallEntity.getComponent(Wall.class);
      for (Entity movingEntity : engine.getEntitiesWithComponent(EntityMoveState.class)) {
        EntityLocation location = movingEntity.getComponent(EntityLocation.class);
        float minX = Math.min(wall.start.x, wall.end.x);
        float maxX = Math.max(wall.start.x, wall.end.x);
        float minY = Math.min(wall.start.y, wall.end.y);
        float maxY = Math.max(wall.start.y, wall.end.y);
        if (location.getBox().overlaps(temp.set(minX, minY, maxX - minX, maxY - minY))) {
          float distanceToWall = Intersector.distanceLinePoint(wall.start, wall.end, location.getCenter());
          distanceToWall -= location.getRadius();
          if (distanceToWall < 0 && Intersector.pointLineSide(wall.start, wall.end, location.getCenter()) == -1) {
            location.applyVelocity(-distanceToWall * wall.inwards.x, -distanceToWall * wall.inwards.y);
          }
        }
      }
    }
  }

}

Java Source Code List

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