562 lines
18 KiB
JavaScript
562 lines
18 KiB
JavaScript
var renderer;
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var stage;
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var screenWidth;
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var screenHeight;
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var counter;
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var totalScreenPixels;
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var cycleDuration;
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var connectionDistance;
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var connectionLimit;
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var pointShiftDistance;
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// var colorShiftAmt;
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var disconnectedColorShiftAmt;
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var polygon;
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var startPoints;
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var polygonPoints;
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var tweeningFns;
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var lastLoop;
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var thisLoop;
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var fps;
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var fpsGraphic;
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var scrollDelta;
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var pointShiftBiasX;
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var pointShiftBiasY;
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var resolution = 2;
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var fpsEnabled = false;
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var click = null;
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var clickEnd = false;
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var clickPullRateStart = 0.02;
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var clickMaxDistStart = 100;
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var clickPullRateInc = 0.0005;
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var clickPullRateMax = 0.1;
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var clickMaxDistInc = 5;
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var clickMaxDistMax = 5000;
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var clickPullRate = clickPullRateStart;
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var clickMaxDist = clickMaxDistStart;
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var clickEndRebount = -20;
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function randomInt (min, max) {
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// inclusive of min and max
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return Math.floor(Math.random() * (max - min + 1)) + min;
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}
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function linearTweening (t, b, c, d) {
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// t = current time
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// b = start value
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// c = change in value
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// d = duration
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return ((c * t) / d) + b;
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}
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/* eslint-disable no-unused-vars */
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function easeOutBounce (t, b, c, d) {
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if ((t /= d) < (1 / 2.75)) {
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return c * (7.5625 * t * t) + b;
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} else if (t < (2 / 2.75)) {
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return c * (7.5625 * (t -= (1.5 / 2.75)) * t + 0.75) + b;
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} else if (t < (2.5 / 2.75)) {
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return c * (7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375) + b;
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} else {
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return c * (7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375) + b;
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}
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}
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function easeInSine (t, b, c, d) {
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return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
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}
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function easeOutSine (t, b, c, d) {
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return c * Math.sin(t / d * (Math.PI / 2)) + b;
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}
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function easeInOutSine (t, b, c, d) {
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return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
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}
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function easeInQuad (t, b, c, d) {
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return c * (t /= d) * t + b;
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}
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function easeOutQuad (t, b, c, d) {
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return -c * (t /= d) * (t - 2) + b;
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}
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function easeInOutQuad (t, b, c, d) {
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if ((t /= d / 2) < 1) return c / 2 * t * t + b;
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return -c / 2 * ((--t) * (t - 2) - 1) + b;
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}
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function easeInCubic (t, b, c, d) {
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return c * (t /= d) * t * t + b;
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}
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function easeOutCubic (t, b, c, d) {
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return c * ((t = t / d - 1) * t * t + 1) + b;
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}
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function easeInOutCubic (t, b, c, d) {
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if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
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return c / 2 * ((t -= 2) * t * t + 2) + b;
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}
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function easeInExpo (t, b, c, d) {
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return (t === 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
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}
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function easeOutExpo (t, b, c, d) {
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return (t === d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
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}
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function easeInOutExpo (t, b, c, d) {
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if (t === 0) return b;
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if (t === d) return b + c;
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if ((t /= d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
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return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
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}
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function easeInElastic (t, b, c, d) {
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var s = 1.70158; var p = 0; var a = c;
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if (t === 0) return b; if ((t /= d) === 1) return b + c; if (!p) p = d * 0.3;
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if (a < Math.abs(c)) { a = c; s = p / 4; } else s = p / (2 * Math.PI) * Math.asin(c / a);
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return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
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}
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function easeOutElastic (t, b, c, d) {
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var s = 1.70158; var p = 0; var a = c;
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if (t === 0) return b; if ((t /= d) === 1) return b + c; if (!p) p = d * 0.3;
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if (a < Math.abs(c)) { a = c; s = p / 4; } else s = p / (2 * Math.PI) * Math.asin(c / a);
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return a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b;
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}
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function easeInOutElastic (t, b, c, d) {
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var s = 1.70158; var p = 0; var a = c;
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if (t === 0) return b; if ((t /= d / 2) === 2) return b + c; if (!p) p = d * (0.3 * 1.5);
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if (a < Math.abs(c)) { a = c; s = p / 4; } else s = p / (2 * Math.PI) * Math.asin(c / a);
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if (t < 1) return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
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return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * 0.5 + c + b;
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}
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function easeInCirc (t, b, c, d) {
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return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
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}
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function easeOutCirc (t, b, c, d) {
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return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
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}
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function easeInOutCirc (t, b, c, d) {
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if ((t /= d / 2) < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
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return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
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}
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/* eslint-enable no-unused-vars */
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// from: http://stackoverflow.com/a/5624139
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// modified to return integer literal
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function rgbToHex (color) {
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return parseInt(((1 << 24) + (color.r << 16) + (color.g << 8) + color.b).toString(16).slice(1), 16);
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}
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/* Choose a random RGB color */
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function randomColor () {
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return {
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r: Math.floor(Math.random() * (255 + 1)),
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g: Math.floor(Math.random() * (255 + 1)),
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b: Math.floor(Math.random() * (255 + 1))
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};
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}
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/* Find the average of two RGB colors and return one RGB of that color */
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function averageColor (color1, color2) {
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return {
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r: Math.round((color1.r + color2.r) / 2),
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g: Math.round((color1.g + color2.g) / 2),
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b: Math.round((color1.b + color2.b) / 2)
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};
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}
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/*
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* Find the average of two RGB colors where color1 is weighted against color2 by the given weight.
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* weight is a decimal between 0 and 1.
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*/
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function weightedAverageColor (color1, color2, weight) {
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return {
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r: Math.round(((color1.r * (2 * weight)) + (color2.r * (2 * (1 - weight)))) / 2),
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g: Math.round(((color1.g * (2 * weight)) + (color2.g * (2 * (1 - weight)))) / 2),
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b: Math.round(((color1.b * (2 * weight)) + (color2.b * (2 * (1 - weight)))) / 2)
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};
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}
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/* Darken the color by a factor of 0 to 1, where 1 is black and 0 is white */
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function shadeColor (color, shadeFactor) {
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return {
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r: Math.round(color.r * (1 - shadeFactor)),
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g: Math.round(color.g * (1 - shadeFactor)),
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b: Math.round(color.b * (1 - shadeFactor))
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};
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}
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/* Given a color component (red, green, or blue int), randomly shift by configurable amount */
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function shiftColorComponent (component, maxShiftAmt) {
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var shiftAmt = randomInt(maxShiftAmt * -1, maxShiftAmt);
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var newComponent = component + shiftAmt;
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if ((newComponent < 0) || (newComponent > 255)) {
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newComponent = component - shiftAmt;
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}
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return newComponent;
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}
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/* Randomly shift a RGB color by a configurable amount and return new RGB color */
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function shiftColor (color, maxShiftAmt) {
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return {
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r: shiftColorComponent(color.r, maxShiftAmt),
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g: shiftColorComponent(color.g, maxShiftAmt),
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b: shiftColorComponent(color.b, maxShiftAmt)
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};
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}
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/* from: https://stackoverflow.com/a/17130415 */
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function getMousePos (canvas, evt, res) {
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var rect = canvas.getBoundingClientRect();
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return {
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x: Math.round((evt.clientX - rect.left) / (rect.right - rect.left) * canvas.width / res),
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y: Math.round((evt.clientY - rect.top) / (rect.bottom - rect.top) * canvas.height / res)
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};
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}
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function distance (point1, point2) {
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var a = point1[0] - point2[0];
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var b = point1[1] - point2[1];
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return Math.sqrt(a * a + b * b);
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}
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function getRandomPoints (numPoints, maxX, maxY, tweeningFns) {
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var i, x, y, color, cycleStart, easingFn;
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var points = [];
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for (i = 0; i < numPoints; i++) {
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x = randomInt(0, maxX - 1);
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y = randomInt(0, maxY - 1);
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cycleStart = randomInt(0, cycleDuration - 1);
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color = randomColor();
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easingFn = randomInt(0, tweeningFns.length - 1);
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points[i] = [x, y, cycleStart, color, easingFn];
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}
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return points;
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}
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// eslint-disable-next-line no-unused-vars
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function shiftPointCounter (original, maxShiftAmt) {
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var shiftAmt = randomInt(maxShiftAmt * -1, 0);
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var newCounter = original + shiftAmt;
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if (newCounter < 0) {
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newCounter = cycleDuration + shiftAmt;
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}
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return newCounter;
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}
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function shiftPoints (points, maxShiftAmt, counter, tweeningFns) {
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var i, shiftX, shiftY, candidateX, candidateY;
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for (i = 0; i < points.original.length; i++) {
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if (points.target[i][2] >= cycleDuration) {
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// cycleDuration was reduced and now this point's cycle is out of bounds. Randomly pick a new valid one.
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points.target[i][2] = randomInt(0, cycleDuration - 1);
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}
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if (points.target[i][2] === counter) {
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points.original[i] = points.target[i].slice();
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shiftX = randomInt(maxShiftAmt * -1, maxShiftAmt);
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shiftY = randomInt(maxShiftAmt * -1, maxShiftAmt);
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if (((shiftX < 0) && (pointShiftBiasX === 1)) || ((shiftX > 0) && (pointShiftBiasX === -1))) {
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shiftX = shiftX * -1;
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}
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if (((shiftY < 0) && (pointShiftBiasY === 1)) || ((shiftY > 0) && (pointShiftBiasY === -1))) {
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shiftY = shiftY * -1;
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}
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candidateX = points.original[i][0] + shiftX;
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candidateY = points.original[i][1] + shiftY;
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if ((candidateX > screenWidth) || (candidateX < 0)) {
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candidateX = points.original[i][0] - shiftX;
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}
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if ((candidateY > screenHeight) || (candidateY < 0)) {
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candidateY = points.original[i][1] - shiftY;
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}
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points.target[i][0] = candidateX;
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points.target[i][1] = candidateY;
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points.target[i][4] = randomInt(0, tweeningFns.length - 1);
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// FIXME: buggy, makes points jump around too fast
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// points.target[i][2] = shiftPointCounter(points.original[i][2], maxShiftAmt);
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}
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}
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// clear pointShiftBiases now that they have been "used"
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pointShiftBiasX = 0;
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pointShiftBiasY = 0;
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return points;
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}
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function pullPoints (points, clickPos, pullRate, maxDist) {
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var xDist, yDist;
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for (var i = 0; i < points.target.length; i++) {
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xDist = clickPos.x - points.target[i][0];
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yDist = clickPos.y - points.target[i][1];
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if (Math.abs(xDist) <= maxDist && Math.abs(yDist) <= maxDist) {
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points.target[i][0] += Math.round(xDist * pullRate);
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points.target[i][1] += Math.round(yDist * pullRate);
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}
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}
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}
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function redistributeCycles (points) {
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for (var i = 0; i < points.original.length; i++) {
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points.target[i][2] = randomInt(0, cycleDuration - 1);
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}
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return points;
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}
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function relativeCounter (counter, targetStart) {
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var relCounter = counter - targetStart;
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if (relCounter < 0) {
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return cycleDuration + relCounter;
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}
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return relCounter;
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}
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function drawPolygon (polygon, points, counter, tweeningFns) {
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var i, j, easingFn, avgColor, shadedColor, connectionCount, dist, connectivity;
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// calculate vectors
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for (i = 0; i < points.original.length; i++) {
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easingFn = tweeningFns[points.target[i][4]];
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points.tweened[i][0] = easingFn(relativeCounter(counter, points.target[i][2]), points.original[i][0], points.target[i][0] - points.original[i][0], cycleDuration);
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points.tweened[i][1] = easingFn(relativeCounter(counter, points.target[i][2]), points.original[i][1], points.target[i][1] - points.original[i][1], cycleDuration);
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}
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// draw lines
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for (i = 0; i < points.original.length; i++) {
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connectionCount = 0;
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for (j = i + 1; j < points.original.length; j++) {
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// TODO pick the N (connectionLimit) closest connections instead of the first N that occur sequentially.
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if (connectionCount >= connectionLimit) break;
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dist = distance(points.tweened[i], points.tweened[j]);
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connectivity = dist / connectionDistance;
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if ((j !== i) && (dist <= connectionDistance)) {
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// find average color of both points
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if ((points.tweened[i][2] === counter) || (points.tweened[j][2] === counter)) {
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// avgColor = shiftColor(avgColor, Math.round(colorShiftAmt * (1 - connectivity)));
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points.tweened[i][3] = weightedAverageColor(points.tweened[i][3], points.tweened[j][3], connectivity);
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points.tweened[j][3] = weightedAverageColor(points.tweened[j][3], points.tweened[i][3], connectivity);
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}
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avgColor = averageColor(points.tweened[i][3], points.tweened[j][3]);
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shadedColor = shadeColor(avgColor, connectivity);
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polygon.lineStyle(1, rgbToHex(shadedColor), 1);
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polygon.moveTo(points.tweened[i][0], points.tweened[i][1]);
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polygon.lineTo(points.tweened[j][0], points.tweened[j][1]);
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connectionCount = connectionCount + 1;
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}
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}
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if (connectionCount === 0) {
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points.tweened[i][3] = shiftColor(points.tweened[i][3], disconnectedColorShiftAmt);
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}
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// draw vectors
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polygon.lineStyle(1, rgbToHex(points.tweened[i][3]), 1);
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polygon.drawCircle(points.tweened[i][0], points.tweened[i][1], 1);
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}
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}
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function loop () {
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screenWidth = document.documentElement.clientWidth;
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screenHeight = document.documentElement.clientHeight;
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renderer.resize(screenWidth, screenHeight);
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polygon.clear();
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if (click !== null) {
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if (clickEnd) {
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clickPullRate *= clickEndRebount;
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}
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// a pointer event is occuring and needs to affect the points
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pullPoints(polygonPoints, click, clickPullRate, clickMaxDist);
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// slightly increase effect amount for next loop if click is still occuring
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if (clickMaxDist <= clickMaxDistMax) {
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clickMaxDist += clickMaxDistInc;
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}
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if (clickPullRate <= clickPullRateMax) {
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clickPullRate += clickPullRateInc;
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}
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console.log(clickMaxDist);
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console.log(clickPullRate);
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if (clickEnd) {
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click = null;
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clickEnd = false;
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clickMaxDist = clickMaxDistStart;
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clickPullRate = clickPullRateStart;
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}
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}
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drawPolygon(polygon, polygonPoints, counter, tweeningFns);
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counter += 1;
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counter = counter % cycleDuration;
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if (counter === 0 && fpsEnabled) {
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thisLoop = new Date();
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fps = Math.round((1000 / (thisLoop - lastLoop)) * cycleDuration);
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fpsGraphic.setText(fps.toString());
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lastLoop = thisLoop;
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}
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polygonPoints = shiftPoints(polygonPoints, pointShiftDistance, counter, tweeningFns);
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// var mousePosition = renderer.plugins.interaction.mouse.global;
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// triangle.x = mousePosition.x;
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// triangle.y = mousePosition.y;
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// If user scrolled, modify cycleDuration by amount scrolled
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if (scrollDelta !== 0) {
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cycleDuration = cycleDuration + scrollDelta;
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if (cycleDuration < 1) {
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cycleDuration = 1;
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}
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scrollDelta = 0;
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polygonPoints = redistributeCycles(polygonPoints);
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}
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// Tell the `renderer` to `render` the `stage`
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renderer.render(stage);
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window.requestAnimationFrame(loop);
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}
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function loopStart () {
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screenWidth = document.documentElement.clientWidth;
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screenHeight = document.documentElement.clientHeight;
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// Create the renderer
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renderer = window.PIXI.autoDetectRenderer(screenWidth, screenHeight, {antialias: true, resolution: resolution});
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// Add the canvas to the HTML document
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document.body.appendChild(renderer.view);
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// Create a container object called the `stage`
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stage = new window.PIXI.Container();
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renderer.view.style.position = 'absolute';
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renderer.view.style.display = 'block';
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|
renderer.autoResize = true;
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|
|
|
counter = 0;
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totalScreenPixels = screenWidth + screenHeight;
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|
cycleDuration = 60;
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|
connectionDistance = Math.min(Math.round(totalScreenPixels / 16), 75);
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connectionLimit = 10;
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pointShiftDistance = Math.round(totalScreenPixels / 45);
|
|
// colorShiftAmt = 80;
|
|
disconnectedColorShiftAmt = 10;
|
|
polygon = new window.PIXI.Graphics();
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|
tweeningFns = [
|
|
linearTweening,
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|
easeInSine,
|
|
easeOutSine,
|
|
easeInOutSine,
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|
easeInQuad,
|
|
easeOutQuad,
|
|
easeInOutQuad,
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|
easeInCubic,
|
|
easeOutCubic,
|
|
easeInOutCubic
|
|
// easeOutBounce,
|
|
// easeInElastic,
|
|
// easeOutElastic,
|
|
// easeInOutElastic,
|
|
// easeInExpo,
|
|
// easeOutExpo,
|
|
// easeInOutExpo,
|
|
// easeInCirc,
|
|
// easeOutCirc,
|
|
// easeInOutCirc
|
|
];
|
|
startPoints = getRandomPoints(Math.round(totalScreenPixels / 6), screenWidth, screenHeight, tweeningFns);
|
|
polygonPoints = {
|
|
original: startPoints,
|
|
target: JSON.parse(JSON.stringify(startPoints)),
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|
tweened: JSON.parse(JSON.stringify(startPoints))
|
|
};
|
|
stage.addChild(polygon);
|
|
|
|
fpsGraphic = new window.PIXI.Text('0', {font: '25px monospace', fill: 'yellow'});
|
|
fpsGraphic.x = 0;
|
|
fpsGraphic.y = 0;
|
|
|
|
if (fpsEnabled) {
|
|
stage.addChild(fpsGraphic);
|
|
}
|
|
|
|
lastLoop = new Date();
|
|
|
|
scrollDelta = 0;
|
|
|
|
window.requestAnimationFrame(loop);
|
|
}
|
|
|
|
function updateClickPos (event) {
|
|
var canvas = document.getElementsByTagName('canvas')[0];
|
|
click = getMousePos(canvas, event, resolution);
|
|
}
|
|
|
|
window.onload = loopStart;
|
|
|
|
window.addEventListener('mousewheel', function (e) {
|
|
// scrollDelta = scrollDelta + ((e.deltaY / 100) * 3);
|
|
// FIXME: buggy :(
|
|
});
|
|
|
|
window.addEventListener('mousedown', function (e) {
|
|
updateClickPos(e);
|
|
});
|
|
|
|
window.addEventListener('mousemove', function (e) {
|
|
if (click !== null) {
|
|
updateClickPos(e);
|
|
}
|
|
});
|
|
|
|
window.addEventListener('mouseup', function (e) {
|
|
clickEnd = true;
|
|
});
|
|
|
|
window.addEventListener('touchstart', function (e) {
|
|
updateClickPos(e);
|
|
});
|
|
|
|
window.addEventListener('touchmove', function (e) {
|
|
if (click !== null) {
|
|
updateClickPos(e);
|
|
}
|
|
});
|
|
|
|
window.addEventListener('touchup', function (e) {
|
|
clickEnd = true;
|
|
});
|
|
|
|
window.addEventListener('keydown', function (e) {
|
|
if (e.keyCode === 37) { // left
|
|
pointShiftBiasX = -1;
|
|
} else if (e.keyCode === 38) { // up
|
|
pointShiftBiasY = -1;
|
|
} else if (e.keyCode === 39) { // right
|
|
pointShiftBiasX = 1;
|
|
} else if (e.keyCode === 40) { // down
|
|
pointShiftBiasY = 1;
|
|
} else if (e.keyCode === 70) { // f
|
|
// toggle fpsCounter
|
|
if (fpsEnabled) {
|
|
stage.removeChild(fpsGraphic);
|
|
fpsEnabled = false;
|
|
} else {
|
|
stage.addChild(fpsGraphic);
|
|
fpsEnabled = true;
|
|
lastLoop = new Date();
|
|
}
|
|
}
|
|
});
|