I used the following code to recreate and expand upon mr. dickie's image. The image is drawn in all 4 corners with a grayscale radial gradient in the center, and the line's stroke color is set to the x or y value of the line, resulting in a rainbow type pattern. Here is the image:  Here is the code: void setup() { size(400, 400); //set size to 400 x 400 pixels background(0,0,0); //set initial background color to black } //function to create radial gradient emanating from point (centerx, centery) void createGSRadialGradient(int centerx, int centery) { colorMode(RGB, width); //set mode to rgb from 0 - 400 (screen width) for(int i = width; i >= 0; i-=1) { //set up for loop, decrement from outside-in stroke(width-i); //set stroke color to increase as diameter decreases fill(0,0,0,0); //no fill color ellipseMode(CENTER); //elipses are declared by centerpoint ellipse(centerx, centery, i, i); //draw the ellipse } } void draw() { createGSRadialGradient(width/2, width/2); //create gradient centered on screen colorMode(HSB, width); //set color mode to HSB so that hue is defined by just 1 variable int j = width; //declare extra enumeration variable /* the following code works first by setting up a loop to either decrease or increase the 2 enumeration variables, setting the hue to one of them so the color gradually changes (rainbow style), then drawing a line. The points are each comprised of 2 scalars, one being one of the enumeration variables, and the other being a boundary (0 or width). which is which will depend on the corner being drawn */ //draw mesh object in top-left corner for(int i = 0; i <= width; i += 10) { stroke(400-i, 400, 200); //rainbow color, 100% saturation, 50% brightness line(i, 0, 0, j); j -= 10; } //draw mesh object in bottom-right corner for(int i = width; i>= 0; i -= 10) { stroke(i, 400, 200); line(width, j, i, width); j += 10; } j = 0; //reset enumeration //draw mesh object in top-right for(int i = 0; i <= width; i += 10) { stroke(400-i, 400, 200); line(width, i, j, 0); j += 10; } //draw mesh object in bottom left for(int i = width; i >= 0; i -= 10) { stroke(i, 400, 200); line(0, i, j, width); j -= 10; } } void mousePressed() { //save screenshot when mouse is pressed saveFrame("screenshot-##.png"); } |