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shrinks isopleth function

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Francisco Dans 2015-05-14 16:43:17 +02:00
parent 5cdda8d8c7
commit ea4445ab8d
1 changed files with 13 additions and 35 deletions
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48
lib/torque/renderer/ball.js
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@ -175,12 +175,6 @@ BallRenderer.prototype = {
var y = (index - 4 * x) / (4 * this.width);
return [x,y];
},
// Clockwise. Again, there definitely is a better way.
getNeighbors: function(index){
var n = index - this.chWidth;
var s = index + this.chWidth;
return [n, n + 4, index + 4, s + 4, s, s - 4, index - 4, n -4];
},
isEmpty: function(layer) {
for (var i = 0; i<layer.length; i+=4){
if(layer[i+3] > 0) return false;
@ -230,37 +224,21 @@ BallRenderer.prototype = {
}
},
isopleth: function(){
var iso = this.createArray();
var contour = this.contourLayer;
var eq = false;
for (var i = 0, len = contour.length; i<len; i+=4){
if(!eq){
var alpha = contour[i + 3];
if (alpha > 20 && alpha < 255){
var neighbors = this.getNeighbors(i);
var refCol = contour[neighbors[0]+3];
for (var n = 1, ln = neighbors.length; n<ln; ++n){
if (contour[neighbors[n]+3] !== refCol) break;
if (n === ln-1) eq = true;
}
if(!eq){
for (var n = 0, ln = neighbors.length; n<ln; ++n){
var index = neighbors[n];
if(index>0 && (contour[index+3] === 0 || contour[index+3] !== contour[i+3])){
iso[index + 3] = contour[i+3];
iso[index] = 153;
iso[index + 1] = 60;
iso[index + 2] = 243;
}
}
}
}
}
else{
eq = false;
if(typeof this.isoplethLayer === 'undefined') this.isoplethLayer = new Uint8Array(this.size * 4);
for (var i = 0, len = this.contourLayer.length; i<len; i+=4){
var alpha = this.contourLayer[i + 3];
if (alpha > 20 && alpha < 255){
var n = i - this.chWidth,
s = i + this.chWidth,
neighbors = [n, n + 4, i + 4, s + 4, s, s - 4, i - 4, n -4];
for (var n = 0, ln = neighbors.length; n<ln; ++n){
var index = neighbors[n];
if(index>0 && (this.contourLayer[index+3] === 0 || this.contourLayer[index+3] !== this.contourLayer[i+3])){
this.isoplethLayer[index + 3] = Math.min(this.contourLayer[i+3],255);
}
}
}
}
this.isoplethLayer = iso;
},
heatmap: function (gradient){