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118 Getting Started with Processing
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Robot 6: Motion
In this example, the techniques for random and circular motion
are applied to the robot. The background() was removed to
make it easier to see how the robot’s position and body change.
At each frame, a random number between –4 and 4 is added to
the x coordinate, and a random number between –1 and 1 is
added to the y coordinate. This causes the robot to move more
from left to right than top to bottom. Numbers calculated from
the sin() function change the height of the neck so it oscillates
between 50 and 110 pixels high:
float x = 180;
// x coordinate
float y = 400;
// y coordinate
float bodyHeight = 153; // Body height
float neckHeight = 56; // Neck height
float radius = 45; // Head radius
float angle = 0.0; // Angle for motion
void setup() {
size(360, 480);
ellipseMode(RADIUS);
background(0, 153, 204); // Blue background
}