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heatcanvas-worker.js
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heatcanvas-worker.js
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/**
* Copyright 2010 Sun Ning <classicning@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
onmessage = function(e){
calc(e.data);
}
function calc(params) {
value = params.value || {};
degree = params.degree || 1;
for(var pos in params.data){
var data = params.data[pos];
var radius = Math.floor(Math.pow((data / params.step), 1/degree));
var x = Math.floor(pos%params.width);
var y = Math.floor(pos/params.width);
// calculate point x.y
for(var scanx=x-radius; scanx<x+radius; scanx+=1){
// out of extend
if(scanx<0 || scanx>params.width){
continue;
}
for(var scany=y-radius; scany<y+radius; scany+=1){
if(scany<0 || scany>params.height){
continue;
}
var dist = Math.sqrt(Math.pow((scanx-x), 2)+Math.pow((scany-y), 2));
if(dist > radius){
continue;
} else {
var v = data - params.step * Math.pow(dist, degree);
var id = scanx+scany*params.width ;
if(value[id]){
value[id] = value[id] + v;
} else {
value[id] = v;
}
}
}
}
}
postMessage({'value': value});
}