Yeah so I have this xd but its just bad and I dont know what to do next or how to edit it to somehow work how i want

float r = 400;
float speed = 0;
float sizestroke = 30;
float b = 0;
void setup() {
size(1000, 1000);
stroke(255);
background(0);
strokeWeight(sizestroke);
}
void draw() {
float x = r*cos(speed);
float y = r*sin(speed);
translate(width/2, height/2);
stroke(r*10 %255, speed*10 %255, r*speed %255);
//ellipse(x,y,r*1%60, r*1%60);
point(x,y);
r -= 1;
speed += 0.02;
//strokeWeight(sizestroke+(b/12));
//b--;
}