cubemethod

PGraphics cube;
int scale=120;

void setup() {
  size(150, 200);
  noSmooth();
}

PGraphics drawCube(int size, color rgb){
  PGraphics temp=createGraphics(scale,scale+scale/3);
  temp.beginDraw();
  temp.stroke(0,0,0,0);
  temp.fill(rgb);
  temp.quad((size/2),0,                  //draw top of cube (top)(right)(bottom)(left)
            size,(size/3),
            (size/2),((size/3)*2),
            0,(size/3));
  temp.fill(color(red(rgb)-20,            //dim fill by 20
                  green(rgb)-20,
                  blue(rgb)-20),
                  alpha(rgb));
  temp.quad(0,(size/3),                  //draw left of cube (top left)(top right)(bottom right)(bottom left)
            (size/2),((size/3)*2),
            (size/2),(size/3)*4,
            0,size);
  temp.fill(color(red(rgb)-40,            //dim fill by 20
                  green(rgb)-40,
                  blue(rgb)-40),
                  alpha(rgb));
  temp.quad(size,(size/3),              //draw right of cube (top right)(bottom right)(bottom left)(top left)
            size,size,
            (size/2),(size/3)*4,
            (size/2),((size/3)*2));
  temp.fill(rgb);                         //restore fill for storage of rgb in the PGraphics object
  temp.endDraw();
  return temp;
}
boolean keyp=false;
void keyPressed(){
  if(key=='a'){
    keyp=true;
  }
}
void keyReleased(){
  if(key=='a'){
    keyp=false;
  }
}

void printCube(int x, int y){
  color temp=g.fillColor;             //store current fill and stroke temporarily
  color stemp=g.strokeColor;
  stroke(0,0,0,0);                    //stroke transparent
  quad(x+(scale/2),y,                 //draw top of cube (top)(right)(bottom)(left)
       x+scale,y+(scale/3),
       x+(scale/2),y+((scale/3)*2),
       x,y+(scale/3));
  fill(color(red(g.fillColor)-20,     //dim fill by 20
             green(g.fillColor)-20,
             blue(g.fillColor)-20),
             alpha(g.fillColor));
  quad(x,y+(scale/3),                 //draw left of cube (top left)(top right)(bottom right)(bottom left)
       x+(scale/2),y+((scale/3)*2),
       x+(scale/2),y+(scale/3)*4,
       x,y+scale);
  fill(color(red(g.fillColor)-20,     //dim fill by 20
             green(g.fillColor)-20,
             blue(g.fillColor)-20),
             alpha(g.fillColor));
  quad(x+scale,y+(scale/3),           //draw right of cube (top right)(bottom right)(bottom left)(top left)
       x+scale,y+scale,
       x+(scale/2),y+(scale/3)*4,
       x+(scale/2),y+((scale/3)*2));
  fill(temp);                         //restore fill
  stroke(stemp);                      //restore stroke
}

void draw(){
  background(200);
  fill(30,200,200);
  if(cube==null){cube=drawCube(scale,color(200,200,30));} //If cube doesn't exist, make it
  if(!keyp){                  //If A button isn't pressed
    image(cube,9,30);                 //Print Cube using New Method
  }
  else{
    printCube(20,30);                 //Print cube using old method
  }

}