boolean aON=false; boolean bON=false; void setup() { size(500,500); background(255); smooth(); } void draw() { if(aON) { drawLine1(); } if(bON) { background(255); } if(aON = true) { aON = false; } if(bON = true) { bON = false; } } void keyTyped() { if(keyPressed) { if (key == '1') { aON = true; } else { aON = false; } } if(keyPressed) { if (key == '2') { bON = true; } else { bON = false; } } } void drawLine1() { int x2=(int)random(500); int y2=(int)random(500); stroke(0); line(250,250,x2,y2); }