Comic creator – PushMatrix and PopMatrix

It is time to insert a few graphics to the project we started in the Chapter 1, GUI Basics: Building an Interface. Previously, we have insisted on the following two important things regarding the coordinate space:

• The coordinate space is not restricted to any position or size. It usually has its origin in the bottom-left corner of the screen. We avoided this in the last example by using RelativeLayout, which internally performs a translation to the pos property of the Widget.

• Once the coordinate space context is transformed by any instruction, it stays like that until we specify something different. RelativeLayout also addresses this problem with a two context instructions that we are going to study in this section: PushMatrix and PopMatrix.

We use RelativeLayout again in this section, but we will also explain alternatives to it whenever we deal with any other type of Widget. We will add a new file (comicwidgets.kv) to our project. In the comicreator...