Functions
/**
* Functions.
*
* The drawTarget() function makes it easy to draw many distinct targets.
* Each call to drawTarget() specifies the position, size, and number of
* rings for each target.
*/
void setup() {
size(640, 360);
background(51);
noStroke();
noLoop();
}
void draw() {
drawTarget(width * 0.25, height * 0.4, 200, 4);
drawTarget(width * 0.5, height * 0.5, 300, 10);
drawTarget(width * 0.75, height * 0.3, 120, 6);
}
void drawTarget(float xloc, float yloc, int size, int num) {
float grayvalues = 255.0 / num;
float steps = float(size) / num;
for (int i = 0; i < num; i++) {
fill(i * grayvalues);
ellipse(xloc, yloc,
size - i * steps,
size - i * steps);
}
}