Editing TinyDraw

TinyDraw is a simple drawing program that uses the arrow keys.


Individual keyboard keys are identified by [[keycodes]].   

The variable cx is changed when the left and right arrow keys are held down. 

The variable cy is changed when the up and down arrow keys are held down. 

A filled circle is drawn on the screen at the position cx,cy


<edcode>
print("Draw with the arrow keys");

var cx=320;
var cy=240;


function move() {
  // the arrow keys have key codes 37,38,39 and 40
  
  if (keyIsDown(38)) {
    cy-=1; 
  }
  
  if (keyIsDown(40)) {
    cy+=1;  
  }
  
  if (keyIsDown(37)) {
    cx-=1;
  }
  
  if (keyIsDown(39)) {
    cx+=1;
  }
  
  fillCircle(cx,cy,6);
}

run(move);

</edcode>