Saturation

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/**
* Saturation.
*
* Saturation is the strength or purity of the color and represents the
* amount of gray in proportion to the hue. A "saturated" color is pure
* and an "unsaturated" color has a large percentage of gray.
* Move the cursor vertically over each bar to alter its saturation.
*/

int barWidth = 20;
int lastBar = -1;

void setup() {
size(640, 360);
colorMode(HSB, width, height, 100);
noStroke();
}

void draw() {
int whichBar = mouseX / barWidth;
if (whichBar != lastBar) {
int barX = whichBar * barWidth;
fill(barX, mouseY, 66);
rect(barX, 0, barWidth, height);
lastBar = whichBar;
}
}

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