library.js

function BounceOff(fixedRect,movingRect)
{
  if (movingRect.x - fixedRect.x < fixedRect.width/2 + movingRect.width/2
    && fixedRect.x - movingRect.x < fixedRect.width/2 + movingRect.width/2) {
  movingRect.velocityX = movingRect.velocityX * (-1);
  fixedRect.velocityX = fixedRect.velocityX * (-1);
}
if (movingRect.y - fixedRect.y < fixedRect.height/2 + movingRect.height/2
  && fixedRect.y - movingRect.y < fixedRect.height/2 + movingRect.height/2){
  movingRect.velocityY = movingRect.velocityY * (-1);
  fixedRect.velocityY = fixedRect.velocityY * (-1);
}
}


function isTouching(object1,object2){
    if (object1.x - object2.x < object2.width/2 + object1.width/2
      && object2.x - object1.x < object2.width/2 + object1.width/2
      && object1.y - object2.y < object2.height/2 + object1.height/2
      && object2.y - object2.y < object2.height/2 + object1.height/2) {
      return true;
    }
    else {
      return false;
    }
  }