Function createCircle

libs/mapv/mapv.js:1031–1049

* @author kyle / http://nikai.us/

(size)

 */

function createCircle(size) {

    var shadowBlur = size / 2;
    var r2 = size + shadowBlur;
    var offsetDistance = 10000;

    var circle = new Canvas(r2 * 2, r2 * 2);
    var context = circle.getContext('2d');

    context.shadowBlur = shadowBlur;
    context.shadowColor = 'black';
    context.shadowOffsetX = context.shadowOffsetY = offsetDistance;

    context.beginPath();
    context.arc(r2 - offsetDistance, r2 - offsetDistance, size, 0, Math.PI * 2, true);
    context.closePath();
    context.fill();
    return circle;
}

function colorize(pixels, gradient, options) {
    var max = getMax(options);