LJ/webui/indexgl.html

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2018-12-21 16:23:43 +00:00
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>LJ</title>
</head>
<body style="background-color:#222;">
<!-- mg : canvas to display point list as laser simulator -->
<div id = "mgcanvas" class="mgcanvas">
<canvas id="canvas" width="500" height="500"></canvas>
</div>
<!-- Point list draw -->
<script type="text/javascript">
// Store Reference To The Canvas & Set Context
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var lastpoint = { x: 0, y: 0, color: 0};
// 2 different shapes, one blue one green.
var LJ = "/plframe [(350, 330, 65280), (370, 270, 65280), (430, 270, 65280), (410, 330, 65280), (350, 330, 65280),(300, 300, 255), (350, 250, 255), (400, 250, 255), (400, 300, 255), (300, 300, 255)]";
var pl ="";
var pl2 = new Array();
pl = LJ.slice(9);
pl2 = eval(pl.replace(/[()]/g, ''));
// Todo : laser point will have black points to go from a polyline to another. Need to discard those black points.
function draw() {
// Clear Canvas At The Start Of Every Frame
ctx.clearRect(0,0,400,400);
if (pl2.length > 0)
{
// Begin a new path
// 0.7 reduces max coordinates in a more browser compatible resolution.
ctx.beginPath();
ctx.moveTo(pl2[0]*0.7, pl2[1]*0.7);
lastpoint.color = pl2[2];
// Draw n Lines
for (var i = 0; i < pl2.length/3; i++)
{
// New point has the same color -> add a new line to new point
if (pl2[2+(i*3)] === lastpoint.color)
{
ctx.lineTo(pl2[i*3]*0.7, pl2[1+(i*3)]*0.7);
}
// New point has different color -> stroke with previous color
if (pl2[2+(i*3)] != lastpoint.color)
{
ctx.strokeStyle = "#"+(lastpoint.color + Math.pow(16, 6)).toString(16).slice(-6);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(pl2[i*3]*0.7, pl2[1+(i*3)]*0.7);
}
// Last point -> stroke with current color
if (i === (pl2.length/3)-1 )
{
ctx.moveTo(pl2[i*3]*0.7, pl2[1+(i*3)]*0.7);
ctx.strokeStyle = "#"+((pl2[2+(i*3)]) + Math.pow(16, 6)).toString(16).slice(-6);
ctx.stroke();
}
// store point for comparison
lastpoint.x = pl2[i*3];
lastpoint.y = pl2[1+(i*3)];
lastpoint.color = pl2[2+(i*3)];
}
}
// Call Draw Function Again To Create Animation
window.requestAnimationFrame(draw);
}
// Initialize The Draw Function
draw();
</script>
</body>
</html>