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function drawMouseSpeedDemo() {
var mrefreshinterval = 500; // update display every 500ms
var lastmousex=-1;
var lastmousey=-1;
var lastmousetime;
var mousetravel = 0;
var mpoints = [];
var mpoints_max = 30;
$('html').mousemove(function(e) {
var mousex = e.pageX;
var mousey = e.pageY;
if (lastmousex > -1) {
mousetravel += Math.max( Math.abs(mousex-lastmousex), Math.abs(mousey-lastmousey) );
}
lastmousex = mousex;
lastmousey = mousey;
});
var mdraw = function() {
var md = new Date();
var timenow = md.getTime();
if (lastmousetime && lastmousetime!=timenow) {
var pps = Math.round(mousetravel / (timenow - lastmousetime) * 1000);
mpoints.push(pps);
if (mpoints.length > mpoints_max)
mpoints.splice(0,1);
mousetravel = 0;
$('#mousespeed').sparkline(mpoints, { width: mpoints.length*2, tooltipSuffix: ' pixels per second' });
}
lastmousetime = timenow;
setTimeout(mdraw, mrefreshinterval);
}
// We could use setInterval instead, but I prefer to do it this way
setTimeout(mdraw, mrefreshinterval);
};
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