Processing: Creative Coding and Computational Art

PROCESSING: CREATIVE CODING AND COMPUTATIONAL ART
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// Transformation Matrix
printMatrix();
pushMatrix();
translate(50, 50);
rotate(PI);
scale(.5);
printMatrix();
popMatrix();
printMatrix();
If you look at the output, you’ll see that the transformation matrix output is the same
before and after the pushMatrix()/popMatrix() calls. Using pushMatrix() and
popMatrix(), I was able to localize the transformation so that the transformation state
isn’t changed for all future calls. Returning to the earlier Fade-Spin example, I used the
push and pop calls to do precisely the same thing. Try commenting out the
pushMatrix()/popMatrix() calls to see what happens. To learn some more about transformations,
check out www.developer.com/net/vb/article.php/626051#_Introduction.
Finally, the Fade-Spin example was procedurally a little dense, as I used for loops to initialize
and increment a bunch of values. Also, you’ll notice that sometimes I initialized the
loop values as type int and other times as type float. If you specify a variable as type int
and then try to increment it with a non-integer value, you’ll get unexpected results due to
rounding, which can drastically change a sketch. Look at the values in this example:
for (int i=0; i