How it Works: Drawing the Trajectory
In this lesson, we will understand the implementation of the previous exercise. Let's begin!
We'll cover the following...
We'll cover the following...
How it works
The trajectory variable, var trajectory = [];, you added in step 1, represents an empty array.
In step 2, you saved the current ball position with the following code:
trajectory.push({ x: ballX, y: ballY })
This code, which is the invocation of push(), added a new object to the trajectory array. This object is created with JavaScript’s object notation as a tuple of two coordinates, ...