Hello all, new to processing and this forum.

I am having trouble understanding how the 'layering' works in processing.

I am calling 3 different functions, some of them i would like to redraw (not show previous iterations), and some of them i want to iterate (shadow effect).

Whatever i do however seems to cause a global change in all three functions.

Here is my code... thanks!!

void setup() {
 size(300, 300);
}

void myshape(int x, int y) {
 ellipse(x+20, y+0, 10,10);
 ellipse(x+30, y+20, 10,10);
 ellipse(x+10, y+30, 10,10);
 ellipse(x+0, y+10, 10,10);
 }

void mypattern(int x, int y) {
 for (int i=0; i<10; i++) {
   for (int j=0; j<10; j++) {
     noStroke();
     myshape(x + 30*i, y + 30*j);
   }
 }
}


void myclocksecond(int v, int w) {
 int h = hour();
 int m = minute();
 int s = second();
 
 translate(width/2, height/2);
 rotate((PI/30)*s);
 stroke(0);
 fill(21.25*h,4.25*s,4.25*m); // why is this effecting myclockhourminute in void draw()?
 line(0,0,150,150);  
}


void myclockhourminute (int t, int u) {
 int h2 = hour();
 int m2 = minute();
 int s2 = second();

 ellipse(h2*(300/24),265,20,20);
 ellipse(m2*(300/60),285,10,10);
 ellipse(s2*(300/60),295,5,5);
}

void draw() {
 myclockhourminute(0,0);
 mypattern(0,0);
 myclocksecond(0,0);


}