CHAPTER 3
Code Explanation
}
function change() {
ballvx = Number(f.hv.value);
ballvy = Number(f.vv.value);
return false;
}
<canvas id="canvas" width=
"400" height="300">
This browser doesn't support
the HTML5 canvas element.
<form name="f" id="f" onSubmit=
"return change();">
Horizontal velocity <input name=
"hv" id="hv" value="4" type=
"number" min="-10" max="10" />
Vertical velocity <input name=
"vv" id="vv" value="8" type=
"number" min="-10" max="10"/>