When you run this, you will be able to scale the original...

When you run this, you will be able to scale the original cube by half by pressing the downarrow key and scale it by two using the up-arrow key, as shown in Figure 12.5: (Figure can't copy) Notice that when you press the arrow keys, the cube isn't continually rescaled, such that it won't get larger and larger or smaller and smaller, because it is always using the cube's original set of vertices from which the cube is scaled each time. I'll leave this particular functionality for you as the next challenge.

When you run this, you will be able to scale the original cube by half by pressing the downarrow key and scale it by two using the up-arrow key, as shown in Figure 12.5:
(Figure can't copy)
Notice that when you press the arrow keys, the cube isn't continually rescaled, such that it won't get larger and larger or smaller and smaller, because it is always using the cube's original set of vertices from which the cube is scaled each time. I'll leave this particular functionality for you as the next challenge.

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Preservation of Original Geometry

This concept refers to using the original set of vertex coordinates for repeated transformations rather than accumulating transformations over transformed states. It ensures that an object is always scaled relative to its initial dimensions, avoiding compounding errors or unintended distortions.

Scaling Transformations

Scaling transformations involve altering the size of an object by multiplying its dimensions by a scaling factor. In computer graphics, this transformation affects each vertex of an object consistently to either enlarge or shrink it proportionally.

Event-driven Interaction in Graphics

Event-driven interaction is the mechanism where user inputs, such as key presses, trigger actions in a graphical application. In this context, specific keys initiate scaling operations, enabling real-time manipulation of objects within a rendered scene.

Transcript

Please give Ace some feedback