456 lines
14 KiB
JavaScript
456 lines
14 KiB
JavaScript
var renderer,
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stage,
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screenWidth,
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screenHeight,
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counter,
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totalScreenPixels,
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cycleDuration,
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connectionDistance,
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connectionLimit,
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pointShiftDistance,
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colorShiftAmt,
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disconnectedColorShiftAmt,
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polygon,
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startPoints,
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polygonPoints,
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tweeningFns,
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lastLoop,
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thisLoop,
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fps,
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fpsGraphic,
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scrollDelta,
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pointShiftBiasX,
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pointShiftBiasY
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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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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; var s = p / 4 } else var 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; var s = p / 4 } else var 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; var s = p / 4 } else var 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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// 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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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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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 points = [],
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i, x, y, cycleStart, easingFn
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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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function shiftPointCounter (original, maxShiftAmt) {
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var shiftAmt = randomInt(maxShiftAmt * -1, 0),
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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 redistributeCycles (points) {
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for (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, connectionCount, dist, proximity
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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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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) {
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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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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 = PIXI.autoDetectRenderer(screenWidth, screenHeight, {antialias: true, resolution: 2})
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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 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)
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colorShiftAmt = 80
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disconnectedColorShiftAmt = 10
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polygon = new PIXI.Graphics()
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tweeningFns = [
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linearTweening,
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easeInSine,
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easeOutSine,
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easeInOutSine,
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easeInQuad,
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easeOutQuad,
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easeInOutQuad,
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easeInCubic,
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easeOutCubic,
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easeInOutCubic
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// easeOutBounce,
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// easeInElastic,
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// easeOutElastic,
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// easeInOutElastic,
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// easeInExpo,
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// easeOutExpo,
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// easeInOutExpo,
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// easeInCirc,
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// easeOutCirc,
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// easeInOutCirc
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]
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startPoints = getRandomPoints(Math.round(totalScreenPixels / 6), screenWidth, screenHeight, tweeningFns)
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polygonPoints = {
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original: startPoints,
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target: JSON.parse(JSON.stringify(startPoints)),
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tweened: JSON.parse(JSON.stringify(startPoints))
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}
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stage.addChild(polygon)
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fpsGraphic = new PIXI.Text('0', {font: '25px monospace', fill: 'yellow'})
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fpsGraphic.x = 0
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fpsGraphic.y = 0
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stage.addChild(fpsGraphic)
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lastLoop = new Date()
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scrollDelta = 0
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requestAnimationFrame(loop)
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}
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window.onload = loopStart
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window.addEventListener('mousewheel', function (e) {
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scrollDelta = scrollDelta + ((e.deltaY / 100) * 3)
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})
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// TODO: use jquery PEP to allow user to "pull" at a point elastically
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// window.addEventListener('click', function(e) {
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// });
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window.addEventListener('keydown', function (e) {
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if (e.keyCode === 37) { // left
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pointShiftBiasX = -1
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} else if (e.keyCode === 38) { // up
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pointShiftBiasY = -1
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} else if (e.keyCode === 39) { // right
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pointShiftBiasX = 1
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} else if (e.keyCode === 40) { // down
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pointShiftBiasY = 1
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}
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})
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