processing - How can I show the coordinates in my beginner sketches? -

as experiment processing (for loops , variables) i'm trying figure out point relates iteration of variable:

 (i = 10; <100; +=5) {    rect (i, i+10, 50, 50); }  

is there someway me show coordinates next points? or possible colour code iterations? possibly making first 1 red, blue, etc.

any pointing resources, or examples welcome.

sort of that?

size(400,400); colormode(hsb); for(int = 10; <255; +=24) {   int x = i;   int y = i+10;   fill(i,255,255);   rect (x, y, 50, 50);   fill(0);   text(x + "," + y,x,y,100,100); }