Let’s first take look at a process that will help guide your thinking as you try to solve problems along the way during the coding challenge month.
When creating applications or coding of any kind actually, it is important to be able to track where objects are, including where the cursor & your finder position is. This is accomplished in a lot of different ways, or rather using a lot of different commands, but essentially the position of all elements are tracked using some kind of cartesian coordinate system using X, Y (and in the case of 3D) Z. Here is an explanation of how and why this system is important in the drawing app we are creating.
Here is a video explaining how to construct the first phase of the Drawing app in Hopscotch:
Here is the code to assemble the first phase of the app in Scratch 2: