patinko01 - 経済統計練習帳

<script>
 
var x,y;
 
function sample(){
 
 var timer;
var delay = 100;
 
y=0;
x=250;
dx=25;
 
var loop = function () {
 
 y=y+10;
 if(y>500)y=0;
 
 if(x>500)dx=-25;
  if(x<0)dx=25;
 
 x=x+dx;
 
    paint();
 
    clearTimeout(timer);
    timer = setTimeout(loop, delay);
}
 
loop();
 
 
 
 
}
 
function paint(){
 var canv = document.getElementById('memo');
 
  var ctx = canv.getContext('2d');
 
 ctx.fillStyle = "white";
ctx.fillRect(0, 0, 500, 500);
 ctx.fillStyle = "red";
ctx.fillRect(x, y, 10, 10);
 
 
}
 
</script>