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drawin.html
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drawin.html
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<!DOCTYPE html>
<html>
<head>
<meta content='text/html; charset=utf-8' http-equiv='Content-Type' />
<title>Drawin'</title>
<style type="text/css">
html { background:#eee; }
#canvas {
background:#fff;
position:absolute;
top:100px; left:50%;
margin-left:-350px;
-webkit-box-shadow:0px 3px 5px rgba(0,0,0,0.3);
-moz-box-shadow:0px 3px 5px rgba(0,0,0,0.3);
box-shadow:0px 3px 5px rgba(0,0,0,0.3);
cursor:crosshair; }
#etc {
position:absolute;
top:40px; left:50%;
margin-left:-330px;
width:700px; }
#color {
position:absolute;
top:0px; right:20px;
background:#fff;
border:none;
padding:8px;
color:#555;
z-index:30;
width:60px;
-webkit-border-radius:3px;
-webkit-box-shadow:0px 3px 5px rgba(0,0,0,0.3);
-moz-box-shadow:0px 3px 5px rgba(0,0,0,0.3);
box-shadow:0px 3px 5px rgba(0,0,0,0.3); }
button {
cursor:pointer;
display:block;
padding:8px;
background:#555;
color:#eee;
border:none;
-webkit-border-radius:2px;
-webkit-transition: -webkit-border-radius 0.4s;
-webkit-box-shadow:0px 3px 5px rgba(0,0,0,0.3);
-moz-box-shadow:0px 3px 5px rgba(0,0,0,0.3);
box-shadow:0px 3px 5px rgba(0,0,0,0.3); }
button:hover {
-webkit-border-radius:20px; }
button.color {
width:12px;
text-indent:-99999px; }
button#black { background:#222222; }
button#purple { background: #7704A5; }
button#red { background:#C50903; }
button#blue { background:#1874D6; }
button#green { background:#18D63E; }
#colors {
position:absolute;
top:0px; right:100px; }
#colors button {
float:left;
margin-right:5px; }
#clear {
position:absolute;
top:0px; right:211px; }
</style>
</head>
<body>
<div id="container">
<canvas id="canvas" width="700" height="400"></canvas>
<div id="etc">
<input type="text" id="color" value="#000" />
<div id="colors">
<button id="black" class="color">#222222</button>
<button id="purple" class="color">#7704A5</button>
<button id="red" class="color">#C50903</button>
<button id="blue" class="color">#1874D6</button>
<button id="green" class="color">#18D63E</button>
</div>
<button id="clear">DESTROY!!</button>
</div>
</div>
<script src='http://api.relay.io/client/FC692AE6-6522-4E2B-BA56-479DCD8D6F2B.js' type='text/javascript'></script>
<script type="text/javascript" src="jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="json2.js"></script>
<script type="text/javascript">
var relay = new RelayClient("FC692AE6-6522-4E2B-BA56-479DCD8D6F2B");
var canvas, ktx,
seed = ('abcdefghijklmno'.charAt(Math.floor(Math.random()*15)) + (new Date().getTime())).substr(0,10),
count = 0,
color = '#000',
size = 5,
offset = {left:0, top:0},
shapes = [],
current;
function down(e){
if('preventDefault' in e) e.preventDefault();
check_color();
current = { color: color, size: size, id: guid(), points: [point(e)] };
push({ type:'shape', id: current.id, data: current });
shapes.push( current );
}
function move(e){
if(!current) return;
if('preventDefault' in e) e.preventDefault();
current.points.push( point(e) );
draw();
}
function touchmove( e ){
e.preventDefault();
move(e.touches[0]);
}
function touchstart( e ){
down(e.touches[0]);
}
function up(e){
push({ type:'points', id: current.id, data: current.points });
current = null;
}
var draw_timer;
function draw(){
if(draw_timer) return;
draw_timer = setTimeout(real_draw,60);
}
function real_draw(){
draw_timer = null;
ktx.clearRect(0,0,700,500);
for( var s=0, ls=shapes.length; s<ls; s++ ){
var shape = shapes[s],
pts = shape.points;
if(!pts) continue;
ktx.strokeStyle = shape.color;
ktx.lineWidth = shape.size || size;
ktx.beginPath();
ktx.moveTo( pts[0][0], pts[0][1]);
for( var p=1, pl=pts.length; p < pl; p++ ){
ktx.lineTo( pts[ p ][ 0 ], pts[ p ][ 1 ] );
}
ktx.stroke();
}
}
function find_shape(id){
var out;
for( var n=0, l=shapes.length; n < l; n++ )
if( shapes[n].id == id )
out = shapes[n];
return out;
}
function get_shape(obj){
if( !find_shape(obj.id) )
shapes.push( obj.data );
draw();
}
function get_points(obj){
var id = obj.id, owner = find_shape( obj.id );
if( !owner ) return;
owner.points = obj.data;
draw();
}
function clear_shapes(){
current = null;
shapes = [];
draw();
}
function point(e){ return [ e.pageX-offset.left, e.pageY-offset.top ]; }
function guid(){ return seed + '-' + (++count);}
function check_color(){ return (color = $('#color').val()||'#000'); }
$(function(){
canvas = $('#canvas');
ktx = canvas[0].getContext('2d');
offset = canvas.offset();
canvas.mousedown( down );
$(document).mousemove( move ).mouseup( up );
canvas[0].addEventListener('touchmove', touchmove );
canvas[0].addEventListener('touchstart', touchstart );
canvas[0].addEventListener('touchend', up );
$('#clear').click(function(){ push({type:'clear'}); });
$('#colors button').click(function(){
$('#color').val( $(this).text() );
});
});
var queue = [],
push_timer;
function push(message){
queue.push(message);
push_timer = setTimeout(real_push,100);
// real_push();
}
function real_push(message){
push_timer = false;
relay.insert("D953DEC3-B6FE-43CC-9A4A-F1570C370AEE", {data:JSON.stringify(queue),origin:seed});
queue = [];
}
function pull(msg){
var messages = JSON.parse(msg.data), message;
for( var n=0, l=messages.length; n < l; n++ ){
message = messages[n];
if( message.type == 'clear' )
clear_shapes();
else if( msg.origin == seed ) continue;
if( message.type == 'shape' )
get_shape( message );
else if( message.type == 'points' )
get_points( message );
}
}
relay.getUpdates( pull );
</script>
</body>
</html>