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84 Getting Started with Processing
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Example 6-10: Isolating
Transformations
In this example, the smaller rectangle always draws in the same
position because the translate(mouseX, mouseY) is cancelled by
the popMatrix():
void setup() {
size(120, 120);
}
void draw() {
pushMatrix();
translate(mouseX, mouseY);
rect(0, 0, 30, 30);
popMatrix();
translate(35, 10);
rect(0, 0, 15, 15);
}
The pushMatrix() and popMatrix() functions are
always used in pairs. For every pushMatrix(), you
need to have a matching popMatrix().