WEEK04,HW04

void setup(){
  size(500,400);
  fill(255,0,0);
  rect(0,0,50,50);
  fill(0,255,0);
  rect(0,50,50,50);
  fill(0,0,0);
  rect(0,100,50,50);
  fill(255,255,255);
  rect(0,150,50,50);
  fill(255,255,255);
  rect(0,200,50,50);
  fill(0,0,0);
  rect(450,0,50,50);
  fill(0,0,0);
  rect(450,50,50,50);
}
int x=5;
void draw(){
  if(mousePressed && mouseX<50 && mouseY<50) stroke(255,0,0);
  else if(mousePressed && mouseX<50 && mouseY<100) stroke(0,255,0);
  else if(mousePressed && mouseX<50 && mouseY<150) stroke(0,0,0);
  else if(mousePressed && mouseX<50 && mouseY<200) save("a.png");
  else if(mousePressed && mouseX<50 && mouseY<250){
    PImage file = loadImage("a.png");
    image(file, 0,0,500,400);
  }
  else if(mousePressed && mouseX>450 && mouseY<50){
  strokeWeight(++x);
  }
  else if(mousePressed && mouseX>450 && mouseY<1000){
  strokeWeight(--x);
  if(x<2)x=2;
  }
  else if(mousePressed)  line(mouseX, mouseY, pmouseX, pmouseY);
}