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<!doctype html>
<html><head>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<script src="stomp.js"></script>
<style>
#cnvs {
border: none;
-moz-border-radius: 4px;
cursor: url(pencil.cur),crosshair;
position: absolute;
overflow: hidden;
width: 100%;
height: 100%;
}
#cnvs:active {
cursor: url(pencil.cur),crosshair;
}
body {
overflow: hidden;
}
</style>
<title>RabbitMQ Web STOMP Examples: Bunny Drawing</title>
<link href="main.css" rel="stylesheet" type="text/css"/>
</head><body lang="en">
<h1><a href="index.html">RabbitMQ Web STOMP Examples</a> > Bunny Drawing</h1>
<canvas id="cnvs"></canvas>
<script>
var send; var draw;
send = draw = function(){};
var lines = [];
var canvas = document.getElementById('cnvs');
if (canvas.getContext) {
var ctx = canvas.getContext('2d');
var img = new Image();
img.onload = function() {
ctx.drawImage(img, 230, 160);
};
img.src = 'bunny.png';
draw = function(p) {
ctx.beginPath();
ctx.moveTo(p.x1, p.y1);
ctx.lineTo(p.x2, p.y2);
ctx.stroke();
ctx.drawImage(img, 230, 160);
};
var do_resize = function() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
ctx.font = "bold 20px sans-serif";
ctx.fillStyle = "#444";
ctx.fillText("Draw wings on the bunny!", 260, 100);
ctx.font = "normal 16px sans-serif";
ctx.fillStyle = "#888";
ctx.fillText("(For more fun open a second browser)", 255, 130);
ctx.drawImage(img, 230, 160);
ctx.strokeStyle = "#fa0";
ctx.lineWidth = "10";
ctx.lineCap = "round";
$.map(lines, function (p) {
draw(p);
});
};
$(window).resize(do_resize);
$(do_resize);
var pos = $('#cnvs').position();
var prev = null;
$('#cnvs').mousedown(function(evt) {
evt.preventDefault();
evt.stopPropagation();
$('#cnvs').bind('mousemove', function(e) {
var curr = {x:e.pageX-pos.left, y:e.pageY-pos.top};
if (!prev) {
prev = curr;
return;
}
if (Math.sqrt(Math.pow(prev.x - curr.x, 2) +
Math.pow(prev.y - curr.y, 2)) > 8) {
var p = {x1:prev.x, y1:prev.y, x2:curr.x, y2:curr.y}
lines.push(p);
draw(p);
send(JSON.stringify(p));
prev = curr;
}
});
});
$('html').mouseup(function() {
prev = null;
$('#cnvs').unbind('mousemove');
});
}
else {
document.write("Sorry - this demo requires a browser with canvas tag support.");
}
// Stomp.js boilerplate
var ws = new WebSocket('ws://' + window.location.hostname + ':15674/ws');
var client = Stomp.over(ws);
client.debug = function() {
if (window.console && console.log && console.log.apply) {
console.log.apply(console, arguments);
}
};
send = function(data) {
client.send('/topic/bunny', {}, data);
};
var on_connect = function(x) {
id = client.subscribe('/topic/bunny', function(d) {
var p = JSON.parse(d.body);
lines.push(p);
draw(p, true);
});
};
var on_error = function() {
console.log('error');
};
client.connect('guest', 'guest', on_connect, on_error, '/');
</script>
</body></html>
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