lines

This is a simulation of a bouncing ball. The canon is the white arrow. It can be moved by left-clicking and dragging, and it can be rotated by right-clicking and dragging. To shoot a ball, click on the button that says "shoot" in the top left corner. To draw a line for the ball to bounce off of, left-click and drag on the background. The line can be erased by right-clicking and dragging. You can also add portals by holding "p", pressing the mouse and holding it on where you want your first portal, dragging to where you want the second portal and releasing.