lerpColor

The oddly named lerpColor provides another colour function. Lerp is short for linear interpolation, a simple means of finding values between a start and end position.

Here's a small program snippet which draws a series of decreasing squares, gradually changing from the first colour (in this case red) to the second (orange):


// lerpColor() example program
size(400, 400);
noStroke();
// set the two colours to draw a gradient between
color red = color(255,0,0);
color orange = color(240,150,40);
// choose the number of steps - the more the smoother the gradient
int number_of_steps=50;
float percentage_per_step = 1.0 / number_of_steps;
for (int i=0; i<number_of_steps; i++) {
fill(lerpColor(red,orange,percentage_per_step*i));
int border=i*((height/2)/number_of_steps);
rect(border,border,width-border-border,height-border-border);
}