As it can be destroyed by the enemy, we will wrap up its creation inside its own method. That makes this process reusable.
1. Insert the method
CreateBallinto ourgameclass.Method CreateBall:Int ()
2. The ball is a field set inside the game class, so assign an image object to it through the
CreateImagemethod. It will be placed in the lower center of the canvas:ball = eng.CreateImage(atlas,64,0,32,32,cw/2,ch-50)
3. Set its radius and scale:
ball.SetRadius(16) ball.SetScale(1.5)
4. Now, set the friction property. Once in movement, we don't want it to move forever, but slow down once you don't tilt the device:
ball.SetFriction(0.8)
5. Assign it to the game layer:
ball.SetLayer(layerGame)
6. To detect a collision, set its collision group to
grpBall, so that it can collide with the enemies and the tiles:ball.SetColGroup(grpBall) ball.SetColWith(grpEnemy, True) ball.SetColWith(grpTile, True)
7. Finally, set its maximum speed to
20, and close the method off...