Getting Started with Processing by Casey Reas and Ben Fry

Author:Casey Reas and Ben Fry
Language: eng
Format: mobi
Publisher: O'Reilly Media, Inc.
Published: 2015-09-22T04:00:00+00:00

Make a Function

In this section, we’ll draw an owl to explain the steps involved in making a function.

Example 9-3: Draw the Owl

First, we’ll draw the owl without using a function:

void setup() { size(480, 120); } void draw() { background(176, 204, 226); translate(110, 110); stroke(138, 138, 125); strokeWeight(70); line(0, -35, 0, -65); // Body noStroke(); fill(255); ellipse(-17.5, -65, 35, 35); // Left eye dome ellipse(17.5, -65, 35, 35); // Right eye dome arc(0, -65, 70, 70, 0, PI); // Chin fill(51, 51, 30); ellipse(-14, -65, 8, 8); // Left eye ellipse(14, -65, 8, 8); // Right eye quad(0, -58, 4, -51, 0, -44, -4, -51); // Beak }

Notice that translate() is used to move the origin (0,0) to 110 pixels over and 110 pixels down. Then the owl is drawn relative to (0,0), with its coordinates sometimes positive and negative as it’s centered around the new 0,0 point. See Figure 9-1.

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