splat-ecs/lib/systems/simulation/apply-movement-2d.js

A 2D HTML5 Canvas game engine

module.exports = function(ecs, game) {
  game.entities.registerSearch("applyMovement2d", ["velocity", "movement2d"]);
  ecs.addEach(function applyMovement2d(entity) {
    var velocity = game.entities.getComponent(entity, "velocity");
    var movement2d = game.entities.getComponent(entity, "movement2d");
    if (movement2d.up && velocity.y > movement2d.upMax) {
      velocity.y += movement2d.upAccel;
    }
    if (movement2d.down && velocity.y < movement2d.downMax) {
      velocity.y += movement2d.downAccel;
    }
    if (movement2d.left && velocity.x > movement2d.leftMax) {
      velocity.x += movement2d.leftAccel;
    }
    if (movement2d.right && velocity.x < movement2d.rightMax) {
      velocity.x += movement2d.rightAccel;
    }
  }, "applyMovement2d");
};