diff --git a/assets/audio/africa.mp3 b/assets/audio/africa.mp3
index f1ae40b..7f45e50 100644
Binary files a/assets/audio/africa.mp3 and b/assets/audio/africa.mp3 differ
diff --git a/assets/audio/africa.ogg b/assets/audio/africa.ogg
new file mode 100644
index 0000000..2a995ab
Binary files /dev/null and b/assets/audio/africa.ogg differ
diff --git a/assets/css/style.css b/assets/css/style.css
index dd7d4d6..623c359 100644
--- a/assets/css/style.css
+++ b/assets/css/style.css
@@ -1 +1,6 @@
* { margin: 0; padding: 0; }
+
+html, body, img {
+ width: 100%;
+ height: 100%;
+}
diff --git a/assets/js/rainyday.js b/assets/js/rainyday.js
new file mode 100644
index 0000000..f72a478
--- /dev/null
+++ b/assets/js/rainyday.js
@@ -0,0 +1,1011 @@
+/**
+ * Defines a new instance of the rainyday.js.
+ * @param options options element with script parameters
+ * @param canvas to be used (if not defined a new one will be created)
+ */
+
+function RainyDay(options, canvas) {
+
+ if (this === window) { //if *this* is the window object, start over with a *new* object
+ return new RainyDay(options);
+ }
+
+ this.img = options.image;
+ var defaults = {
+ opacity: 1,
+ blur: 10,
+ crop: [0, 0, this.img.naturalWidth, this.img.naturalHeight],
+ enableSizeChange: true,
+ parentElement: document.getElementsByTagName('body')[0],
+ fps: 30,
+ fillStyle: '#8ED6FF',
+ enableCollisions: true,
+ gravityThreshold: 3,
+ gravityAngle: Math.PI / 2,
+ gravityAngleVariance: 0,
+ reflectionScaledownFactor: 5,
+ reflectionDropMappingWidth: 200,
+ reflectionDropMappingHeight: 200,
+ width: this.img.clientWidth,
+ height: this.img.clientHeight,
+ position: 'absolute',
+ top: 0,
+ left: 0
+ };
+
+ // add the defaults to options
+ for (var option in defaults) {
+ if (typeof options[option] === 'undefined') {
+ options[option] = defaults[option];
+ }
+ }
+ this.options = options;
+
+ this.drops = [];
+
+ // prepare canvas elements
+ this.canvas = canvas || this.prepareCanvas();
+ this.prepareBackground();
+ this.prepareGlass();
+
+ // assume defaults
+ this.reflection = this.REFLECTION_MINIATURE;
+ this.trail = this.TRAIL_DROPS;
+ this.gravity = this.GRAVITY_NON_LINEAR;
+ this.collision = this.COLLISION_SIMPLE;
+
+ // set polyfill of requestAnimationFrame
+ this.setRequestAnimFrame();
+}
+
+/**
+ * Create the main canvas over a given element
+ * @returns HTMLElement the canvas
+ */
+RainyDay.prototype.prepareCanvas = function() {
+ var canvas = document.createElement('canvas');
+ canvas.style.position = this.options.position;
+ canvas.style.top = this.options.top;
+ canvas.style.left = this.options.left;
+ canvas.width = this.options.width;
+ canvas.height = this.options.height;
+ this.options.parentElement.appendChild(canvas);
+ if (this.options.enableSizeChange) {
+ this.setResizeHandler();
+ }
+ return canvas;
+};
+
+RainyDay.prototype.setResizeHandler = function() {
+ // use setInterval if oneresize event already use by other.
+ if (window.onresize !== null) {
+ window.setInterval(this.checkSize.bind(this), 100);
+ } else {
+ window.onresize = this.checkSize.bind(this);
+ window.onorientationchange = this.checkSize.bind(this);
+ }
+};
+
+/**
+ * Periodically check the size of the underlying element
+ */
+RainyDay.prototype.checkSize = function() {
+ var clientWidth = this.img.clientWidth;
+ var clientHeight = this.img.clientHeight;
+ var clientOffsetLeft = this.img.offsetLeft;
+ var clientOffsetTop = this.img.offsetTop;
+ var canvasWidth = this.canvas.width;
+ var canvasHeight = this.canvas.height;
+ var canvasOffsetLeft = this.canvas.offsetLeft;
+ var canvasOffsetTop = this.canvas.offsetTop;
+
+ if (canvasWidth !== clientWidth || canvasHeight !== clientHeight) {
+ this.canvas.width = clientWidth;
+ this.canvas.height = clientHeight;
+ this.prepareBackground();
+ this.glass.width = this.canvas.width;
+ this.glass.height = this.canvas.height;
+ this.prepareReflections();
+ }
+ if (canvasOffsetLeft !== clientOffsetLeft || canvasOffsetTop !== clientOffsetTop) {
+ this.canvas.offsetLeft = clientOffsetLeft;
+ this.canvas.offsetTop = clientOffsetTop;
+ }
+};
+
+/**
+ * Start animation loop
+ */
+RainyDay.prototype.animateDrops = function() {
+ if (this.addDropCallback) {
+ this.addDropCallback();
+ }
+ // |this.drops| array may be changed as we iterate over drops
+ var dropsClone = this.drops.slice();
+ var newDrops = [];
+ for (var i = 0; i < dropsClone.length; ++i) {
+ if (dropsClone[i].animate()) {
+ newDrops.push(dropsClone[i]);
+ }
+ }
+ this.drops = newDrops;
+ window.requestAnimFrame(this.animateDrops.bind(this));
+};
+
+/**
+ * Polyfill for requestAnimationFrame
+ */
+RainyDay.prototype.setRequestAnimFrame = function() {
+ var fps = this.options.fps;
+ window.requestAnimFrame = (function() {
+ return window.requestAnimationFrame ||
+ window.webkitRequestAnimationFrame ||
+ window.mozRequestAnimationFrame ||
+ function(callback) {
+ window.setTimeout(callback, 1000 / fps);
+ };
+ })();
+};
+
+/**
+ * Create the helper canvas for rendering raindrop reflections.
+ */
+RainyDay.prototype.prepareReflections = function() {
+ this.reflected = document.createElement('canvas');
+ this.reflected.width = this.canvas.width / this.options.reflectionScaledownFactor;
+ this.reflected.height = this.canvas.height / this.options.reflectionScaledownFactor;
+ var ctx = this.reflected.getContext('2d');
+ ctx.drawImage(this.img, this.options.crop[0], this.options.crop[1], this.options.crop[2], this.options.crop[3], 0, 0, this.reflected.width, this.reflected.height);
+};
+
+/**
+ * Create the glass canvas.
+ */
+RainyDay.prototype.prepareGlass = function() {
+ this.glass = document.createElement('canvas');
+ this.glass.width = this.canvas.width;
+ this.glass.height = this.canvas.height;
+ this.context = this.glass.getContext('2d');
+};
+
+/**
+ * Main function for starting rain rendering.
+ * @param presets list of presets to be applied
+ * @param speed speed of the animation (if not provided or 0 static image will be generated)
+ */
+RainyDay.prototype.rain = function(presets, speed) {
+ // prepare canvas for drop reflections
+ if (this.reflection !== this.REFLECTION_NONE) {
+ this.prepareReflections();
+ }
+
+ this.animateDrops();
+
+ // animation
+ this.presets = presets;
+
+ this.PRIVATE_GRAVITY_FORCE_FACTOR_Y = (this.options.fps * 0.001) / 25;
+ this.PRIVATE_GRAVITY_FORCE_FACTOR_X = ((Math.PI / 2) - this.options.gravityAngle) * (this.options.fps * 0.001) / 50;
+
+ // prepare gravity matrix
+ if (this.options.enableCollisions) {
+
+ // calculate max radius of a drop to establish gravity matrix resolution
+ var maxDropRadius = 0;
+ for (var i = 0; i < presets.length; i++) {
+ if (presets[i][0] + presets[i][1] > maxDropRadius) {
+ maxDropRadius = Math.floor(presets[i][0] + presets[i][1]);
+ }
+ }
+
+ if (maxDropRadius > 0) {
+ // initialize the gravity matrix
+ var mwi = Math.ceil(this.canvas.width / maxDropRadius);
+ var mhi = Math.ceil(this.canvas.height / maxDropRadius);
+ this.matrix = new CollisionMatrix(mwi, mhi, maxDropRadius);
+ } else {
+ this.options.enableCollisions = false;
+ }
+ }
+
+ for (var i = 0; i < presets.length; i++) {
+ if (!presets[i][3]) {
+ presets[i][3] = -1;
+ }
+ }
+
+ var lastExecutionTime = 0;
+ this.addDropCallback = function() {
+ var timestamp = new Date().getTime();
+ if (timestamp - lastExecutionTime < speed) {
+ return;
+ }
+ lastExecutionTime = timestamp;
+ var context = this.canvas.getContext('2d');
+ context.clearRect(0, 0, this.canvas.width, this.canvas.height);
+ context.drawImage(this.background, 0, 0, this.canvas.width, this.canvas.height);
+ // select matching preset
+ var preset;
+ for (var i = 0; i < presets.length; i++) {
+ if (presets[i][2] > 1 || presets[i][3] === -1) {
+ if (presets[i][3] !== 0) {
+ presets[i][3]--;
+ for (var y = 0; y < presets[i][2]; ++y) {
+ this.putDrop(new Drop(this, Math.random() * this.canvas.width, Math.random() * this.canvas.height, presets[i][0], presets[i][1]));
+ }
+ }
+ } else if (Math.random() < presets[i][2]) {
+ preset = presets[i];
+ break;
+ }
+ }
+ if (preset) {
+ this.putDrop(new Drop(this, Math.random() * this.canvas.width, Math.random() * this.canvas.height, preset[0], preset[1]));
+ }
+ context.save();
+ context.globalAlpha = this.options.opacity;
+ context.drawImage(this.glass, 0, 0, this.canvas.width, this.canvas.height);
+ context.restore();
+ }
+ .bind(this);
+};
+
+/**
+ * Adds a new raindrop to the animation.
+ * @param drop drop object to be added to the animation
+ */
+RainyDay.prototype.putDrop = function(drop) {
+ drop.draw();
+ if (this.gravity && drop.r > this.options.gravityThreshold) {
+ if (this.options.enableCollisions) {
+ this.matrix.update(drop);
+ }
+ this.drops.push(drop);
+ }
+};
+
+/**
+ * Clear the drop and remove from the list if applicable.
+ * @drop to be cleared
+ * @force force removal from the list
+ * result if true animation of this drop should be stopped
+ */
+RainyDay.prototype.clearDrop = function(drop, force) {
+ var result = drop.clear(force);
+ if (result) {
+ var index = this.drops.indexOf(drop);
+ if (index >= 0) {
+ this.drops.splice(index, 1);
+ }
+ }
+ return result;
+};
+
+/**
+ * Defines a new raindrop object.
+ * @param rainyday reference to the parent object
+ * @param centerX x position of the center of this drop
+ * @param centerY y position of the center of this drop
+ * @param min minimum size of a drop
+ * @param base base value for randomizing drop size
+ */
+
+function Drop(rainyday, centerX, centerY, min, base) {
+ this.x = Math.floor(centerX);
+ this.y = Math.floor(centerY);
+ this.r = (Math.random() * base) + min;
+ this.rainyday = rainyday;
+ this.context = rainyday.context;
+ this.reflection = rainyday.reflected;
+}
+
+/**
+ * Draws a raindrop on canvas at the current position.
+ */
+Drop.prototype.draw = function() {
+ this.context.save();
+ this.context.beginPath();
+
+ var orgR = this.r;
+ this.r = 0.95 * this.r;
+ if (this.r < 3) {
+ this.context.arc(this.x, this.y, this.r, 0, Math.PI * 2, true);
+ this.context.closePath();
+ } else if (this.colliding || this.yspeed > 2) {
+ if (this.colliding) {
+ var collider = this.colliding;
+ this.r = 1.001 * (this.r > collider.r ? this.r : collider.r);
+ this.x += (collider.x - this.x);
+ this.colliding = null;
+ }
+
+ var yr = 1 + 0.1 * this.yspeed;
+ this.context.moveTo(this.x - this.r / yr, this.y);
+ this.context.bezierCurveTo(this.x - this.r, this.y - this.r * 2, this.x + this.r, this.y - this.r * 2, this.x + this.r / yr, this.y);
+ this.context.bezierCurveTo(this.x + this.r, this.y + yr * this.r, this.x - this.r, this.y + yr * this.r, this.x - this.r / yr, this.y);
+ } else {
+ this.context.arc(this.x, this.y, this.r * 0.9, 0, Math.PI * 2, true);
+ this.context.closePath();
+ }
+
+ this.context.clip();
+
+ this.r = orgR;
+
+ if (this.rainyday.reflection) {
+ this.rainyday.reflection(this);
+ }
+
+ this.context.restore();
+};
+
+/**
+ * Clears the raindrop region.
+ * @param force force stop
+ * @returns Boolean true if the animation is stopped
+ */
+Drop.prototype.clear = function(force) {
+ this.context.clearRect(this.x - this.r - 1, this.y - this.r - 2, 2 * this.r + 2, 2 * this.r + 2);
+ if (force) {
+ this.terminate = true;
+ return true;
+ }
+ if ((this.y - this.r > this.rainyday.canvas.height) || (this.x - this.r > this.rainyday.canvas.width) || (this.x + this.r < 0)) {
+ // over edge so stop this drop
+ return true;
+ }
+ return false;
+};
+
+/**
+ * Moves the raindrop to a new position according to the gravity.
+ */
+Drop.prototype.animate = function() {
+ if (this.terminate) {
+ return false;
+ }
+ var stopped = this.rainyday.gravity(this);
+ if (!stopped && this.rainyday.trail) {
+ this.rainyday.trail(this);
+ }
+ if (this.rainyday.options.enableCollisions) {
+ var collisions = this.rainyday.matrix.update(this, stopped);
+ if (collisions) {
+ this.rainyday.collision(this, collisions);
+ }
+ }
+ return !stopped || this.terminate;
+};
+
+/**
+ * TRAIL function: no trail at all
+ */
+RainyDay.prototype.TRAIL_NONE = function() {
+ // nothing going on here
+};
+
+/**
+ * TRAIL function: trail of small drops (default)
+ * @param drop raindrop object
+ */
+RainyDay.prototype.TRAIL_DROPS = function(drop) {
+ if (!drop.trailY || drop.y - drop.trailY >= Math.random() * 100 * drop.r) {
+ drop.trailY = drop.y;
+ this.putDrop(new Drop(this, drop.x + (Math.random() * 2 - 1) * Math.random(), drop.y - drop.r - 5, Math.ceil(drop.r / 5), 0));
+ }
+};
+
+/**
+ * TRAIL function: trail of unblurred image
+ * @param drop raindrop object
+ */
+RainyDay.prototype.TRAIL_SMUDGE = function(drop) {
+ var y = drop.y - drop.r - 3;
+ var x = drop.x - drop.r / 2 + (Math.random() * 2);
+ if (y < 0 || x < 0) {
+ return;
+ }
+ this.context.drawImage(this.clearbackground, x, y, drop.r, 2, x, y, drop.r, 2);
+};
+
+/**
+ * GRAVITY function: no gravity at all
+ * @returns Boolean true if the animation is stopped
+ */
+RainyDay.prototype.GRAVITY_NONE = function() {
+ return true;
+};
+
+/**
+ * GRAVITY function: linear gravity
+ * @param drop raindrop object
+ * @returns Boolean true if the animation is stopped
+ */
+RainyDay.prototype.GRAVITY_LINEAR = function(drop) {
+ if (this.clearDrop(drop)) {
+ return true;
+ }
+
+ if (drop.yspeed) {
+ drop.yspeed += this.PRIVATE_GRAVITY_FORCE_FACTOR_Y * Math.floor(drop.r);
+ drop.xspeed += this.PRIVATE_GRAVITY_FORCE_FACTOR_X * Math.floor(drop.r);
+ } else {
+ drop.yspeed = this.PRIVATE_GRAVITY_FORCE_FACTOR_Y;
+ drop.xspeed = this.PRIVATE_GRAVITY_FORCE_FACTOR_X;
+ }
+
+ drop.y += drop.yspeed;
+ drop.draw();
+ return false;
+};
+
+/**
+ * GRAVITY function: non-linear gravity (default)
+ * @param drop raindrop object
+ * @returns Boolean true if the animation is stopped
+ */
+RainyDay.prototype.GRAVITY_NON_LINEAR = function(drop) {
+ if (this.clearDrop(drop)) {
+ return true;
+ }
+
+ if (drop.collided) {
+ drop.collided = false;
+ drop.seed = Math.floor(drop.r * Math.random() * this.options.fps);
+ drop.skipping = false;
+ drop.slowing = false;
+ } else if (!drop.seed || drop.seed < 0) {
+ drop.seed = Math.floor(drop.r * Math.random() * this.options.fps);
+ drop.skipping = drop.skipping === false ? true : false;
+ drop.slowing = true;
+ }
+
+ drop.seed--;
+
+ if (drop.yspeed) {
+ if (drop.slowing) {
+ drop.yspeed /= 1.1;
+ drop.xspeed /= 1.1;
+ if (drop.yspeed < this.PRIVATE_GRAVITY_FORCE_FACTOR_Y) {
+ drop.slowing = false;
+ }
+
+ } else if (drop.skipping) {
+ drop.yspeed = this.PRIVATE_GRAVITY_FORCE_FACTOR_Y;
+ drop.xspeed = this.PRIVATE_GRAVITY_FORCE_FACTOR_X;
+ } else {
+ drop.yspeed += 1 * this.PRIVATE_GRAVITY_FORCE_FACTOR_Y * Math.floor(drop.r);
+ drop.xspeed += 1 * this.PRIVATE_GRAVITY_FORCE_FACTOR_X * Math.floor(drop.r);
+ }
+ } else {
+ drop.yspeed = this.PRIVATE_GRAVITY_FORCE_FACTOR_Y;
+ drop.xspeed = this.PRIVATE_GRAVITY_FORCE_FACTOR_X;
+ }
+
+ if (this.options.gravityAngleVariance !== 0) {
+ drop.xspeed += ((Math.random() * 2 - 1) * drop.yspeed * this.options.gravityAngleVariance);
+ }
+
+ drop.y += drop.yspeed;
+ drop.x += drop.xspeed;
+
+ drop.draw();
+ return false;
+};
+
+/**
+ * Utility function to return positive min value
+ * @param val1 first number
+ * @param val2 second number
+ */
+RainyDay.prototype.positiveMin = function(val1, val2) {
+ var result = 0;
+ if (val1 < val2) {
+ if (val1 <= 0) {
+ result = val2;
+ } else {
+ result = val1;
+ }
+ } else {
+ if (val2 <= 0) {
+ result = val1;
+ } else {
+ result = val2;
+ }
+ }
+ return result <= 0 ? 1 : result;
+};
+
+/**
+ * REFLECTION function: no reflection at all
+ */
+RainyDay.prototype.REFLECTION_NONE = function() {
+ this.context.fillStyle = this.options.fillStyle;
+ this.context.fill();
+};
+
+/**
+ * REFLECTION function: miniature reflection (default)
+ * @param drop raindrop object
+ */
+RainyDay.prototype.REFLECTION_MINIATURE = function(drop) {
+ var sx = Math.max((drop.x - this.options.reflectionDropMappingWidth) / this.options.reflectionScaledownFactor, 0);
+ var sy = Math.max((drop.y - this.options.reflectionDropMappingHeight) / this.options.reflectionScaledownFactor, 0);
+ var sw = this.positiveMin(this.options.reflectionDropMappingWidth * 2 / this.options.reflectionScaledownFactor, this.reflected.width - sx);
+ var sh = this.positiveMin(this.options.reflectionDropMappingHeight * 2 / this.options.reflectionScaledownFactor, this.reflected.height - sy);
+ var dx = Math.max(drop.x - 1.1 * drop.r, 0);
+ var dy = Math.max(drop.y - 1.1 * drop.r, 0);
+ this.context.drawImage(this.reflected, sx, sy, sw, sh, dx, dy, drop.r * 2, drop.r * 2);
+};
+
+/**
+ * COLLISION function: default collision implementation
+ * @param drop one of the drops colliding
+ * @param collisions list of potential collisions
+ */
+RainyDay.prototype.COLLISION_SIMPLE = function(drop, collisions) {
+ var item = collisions;
+ var drop2;
+ while (item != null) {
+ var p = item.drop;
+ if (Math.sqrt(Math.pow(drop.x - p.x, 2) + Math.pow(drop.y - p.y, 2)) < (drop.r + p.r)) {
+ drop2 = p;
+ break;
+ }
+ item = item.next;
+ }
+
+ if (!drop2) {
+ return;
+ }
+
+ // rename so that we're dealing with low/high drops
+ var higher,
+ lower;
+ if (drop.y > drop2.y) {
+ higher = drop;
+ lower = drop2;
+ } else {
+ higher = drop2;
+ lower = drop;
+ }
+
+ this.clearDrop(lower);
+ // force stopping the second drop
+ this.clearDrop(higher, true);
+ this.matrix.remove(higher);
+ lower.draw();
+
+ lower.colliding = higher;
+ lower.collided = true;
+};
+
+/**
+ * Resizes canvas, draws original image and applies blurring algorithm.
+ */
+RainyDay.prototype.prepareBackground = function() {
+ this.background = document.createElement('canvas');
+ this.background.width = this.canvas.width;
+ this.background.height = this.canvas.height;
+
+ this.clearbackground = document.createElement('canvas');
+ this.clearbackground.width = this.canvas.width;
+ this.clearbackground.height = this.canvas.height;
+
+ var context = this.background.getContext('2d');
+ context.clearRect(0, 0, this.canvas.width, this.canvas.height);
+
+ context.drawImage(this.img, this.options.crop[0], this.options.crop[1], this.options.crop[2], this.options.crop[3], 0, 0, this.canvas.width, this.canvas.height);
+
+ context = this.clearbackground.getContext('2d');
+ context.clearRect(0, 0, this.canvas.width, this.canvas.height);
+ context.drawImage(this.img, this.options.crop[0], this.options.crop[1], this.options.crop[2], this.options.crop[3], 0, 0, this.canvas.width, this.canvas.height);
+
+ if (!isNaN(this.options.blur) && this.options.blur >= 1) {
+ this.stackBlurCanvasRGB(this.canvas.width, this.canvas.height, this.options.blur);
+ }
+};
+
+/**
+ * Implements the Stack Blur Algorithm (@see http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html).
+ * @param width width of the canvas
+ * @param height height of the canvas
+ * @param radius blur radius
+ */
+RainyDay.prototype.stackBlurCanvasRGB = function(width, height, radius) {
+
+ var shgTable = [
+ [0, 9],
+ [1, 11],
+ [2, 12],
+ [3, 13],
+ [5, 14],
+ [7, 15],
+ [11, 16],
+ [15, 17],
+ [22, 18],
+ [31, 19],
+ [45, 20],
+ [63, 21],
+ [90, 22],
+ [127, 23],
+ [181, 24]
+ ];
+
+ var mulTable = [
+ 512, 512, 456, 512, 328, 456, 335, 512, 405, 328, 271, 456, 388, 335, 292, 512,
+ 454, 405, 364, 328, 298, 271, 496, 456, 420, 388, 360, 335, 312, 292, 273, 512,
+ 482, 454, 428, 405, 383, 364, 345, 328, 312, 298, 284, 271, 259, 496, 475, 456,
+ 437, 420, 404, 388, 374, 360, 347, 335, 323, 312, 302, 292, 282, 273, 265, 512,
+ 497, 482, 468, 454, 441, 428, 417, 405, 394, 383, 373, 364, 354, 345, 337, 328,
+ 320, 312, 305, 298, 291, 284, 278, 271, 265, 259, 507, 496, 485, 475, 465, 456,
+ 446, 437, 428, 420, 412, 404, 396, 388, 381, 374, 367, 360, 354, 347, 341, 335,
+ 329, 323, 318, 312, 307, 302, 297, 292, 287, 282, 278, 273, 269, 265, 261, 512,
+ 505, 497, 489, 482, 475, 468, 461, 454, 447, 441, 435, 428, 422, 417, 411, 405,
+ 399, 394, 389, 383, 378, 373, 368, 364, 359, 354, 350, 345, 341, 337, 332, 328,
+ 324, 320, 316, 312, 309, 305, 301, 298, 294, 291, 287, 284, 281, 278, 274, 271,
+ 268, 265, 262, 259, 257, 507, 501, 496, 491, 485, 480, 475, 470, 465, 460, 456,
+ 451, 446, 442, 437, 433, 428, 424, 420, 416, 412, 408, 404, 400, 396, 392, 388,
+ 385, 381, 377, 374, 370, 367, 363, 360, 357, 354, 350, 347, 344, 341, 338, 335,
+ 332, 329, 326, 323, 320, 318, 315, 312, 310, 307, 304, 302, 299, 297, 294, 292,
+ 289, 287, 285, 282, 280, 278, 275, 273, 271, 269, 267, 265, 263, 261, 259
+ ];
+
+ radius |= 0;
+
+ var context = this.background.getContext('2d');
+ var imageData = context.getImageData(0, 0, width, height);
+ var pixels = imageData.data;
+ var x,
+ y,
+ i,
+ p,
+ yp,
+ yi,
+ yw,
+ rSum,
+ gSum,
+ bSum,
+ rOutSum,
+ gOutSum,
+ bOutSum,
+ rInSum,
+ gInSum,
+ bInSum,
+ pr,
+ pg,
+ pb,
+ rbs;
+ var radiusPlus1 = radius + 1;
+ var sumFactor = radiusPlus1 * (radiusPlus1 + 1) / 2;
+
+ var stackStart = new BlurStack();
+ var stackEnd = new BlurStack();
+ var stack = stackStart;
+ for (i = 1; i < 2 * radius + 1; i++) {
+ stack = stack.next = new BlurStack();
+ if (i === radiusPlus1) {
+ stackEnd = stack;
+ }
+ }
+ stack.next = stackStart;
+ var stackIn = null;
+ var stackOut = null;
+
+ yw = yi = 0;
+
+ var mulSum = mulTable[radius];
+ var shgSum;
+ for (var ssi = 0; ssi < shgTable.length; ++ssi) {
+ if (radius <= shgTable[ssi][0]) {
+ shgSum = shgTable[ssi - 1][1];
+ break;
+ }
+ }
+
+ for (y = 0; y < height; y++) {
+ rInSum = gInSum = bInSum = rSum = gSum = bSum = 0;
+
+ rOutSum = radiusPlus1 * (pr = pixels[yi]);
+ gOutSum = radiusPlus1 * (pg = pixels[yi + 1]);
+ bOutSum = radiusPlus1 * (pb = pixels[yi + 2]);
+
+ rSum += sumFactor * pr;
+ gSum += sumFactor * pg;
+ bSum += sumFactor * pb;
+
+ stack = stackStart;
+
+ for (i = 0; i < radiusPlus1; i++) {
+ stack.r = pr;
+ stack.g = pg;
+ stack.b = pb;
+ stack = stack.next;
+ }
+
+ for (i = 1; i < radiusPlus1; i++) {
+ p = yi + ((width - 1 < i ? width - 1 : i) << 2);
+ rSum += (stack.r = (pr = pixels[p])) * (rbs = radiusPlus1 - i);
+ gSum += (stack.g = (pg = pixels[p + 1])) * rbs;
+ bSum += (stack.b = (pb = pixels[p + 2])) * rbs;
+
+ rInSum += pr;
+ gInSum += pg;
+ bInSum += pb;
+
+ stack = stack.next;
+ }
+
+ stackIn = stackStart;
+ stackOut = stackEnd;
+ for (x = 0; x < width; x++) {
+ pixels[yi] = (rSum * mulSum) >> shgSum;
+ pixels[yi + 1] = (gSum * mulSum) >> shgSum;
+ pixels[yi + 2] = (bSum * mulSum) >> shgSum;
+
+ rSum -= rOutSum;
+ gSum -= gOutSum;
+ bSum -= bOutSum;
+
+ rOutSum -= stackIn.r;
+ gOutSum -= stackIn.g;
+ bOutSum -= stackIn.b;
+
+ p = (yw + ((p = x + radius + 1) < (width - 1) ? p : (width - 1))) << 2;
+
+ rInSum += (stackIn.r = pixels[p]);
+ gInSum += (stackIn.g = pixels[p + 1]);
+ bInSum += (stackIn.b = pixels[p + 2]);
+
+ rSum += rInSum;
+ gSum += gInSum;
+ bSum += bInSum;
+
+ stackIn = stackIn.next;
+
+ rOutSum += (pr = stackOut.r);
+ gOutSum += (pg = stackOut.g);
+ bOutSum += (pb = stackOut.b);
+
+ rInSum -= pr;
+ gInSum -= pg;
+ bInSum -= pb;
+
+ stackOut = stackOut.next;
+
+ yi += 4;
+ }
+ yw += width;
+ }
+
+ for (x = 0; x < width; x++) {
+ gInSum = bInSum = rInSum = gSum = bSum = rSum = 0;
+
+ yi = x << 2;
+ rOutSum = radiusPlus1 * (pr = pixels[yi]);
+ gOutSum = radiusPlus1 * (pg = pixels[yi + 1]);
+ bOutSum = radiusPlus1 * (pb = pixels[yi + 2]);
+
+ rSum += sumFactor * pr;
+ gSum += sumFactor * pg;
+ bSum += sumFactor * pb;
+
+ stack = stackStart;
+
+ for (i = 0; i < radiusPlus1; i++) {
+ stack.r = pr;
+ stack.g = pg;
+ stack.b = pb;
+ stack = stack.next;
+ }
+
+ yp = width;
+
+ for (i = 1; i < radiusPlus1; i++) {
+ yi = (yp + x) << 2;
+
+ rSum += (stack.r = (pr = pixels[yi])) * (rbs = radiusPlus1 - i);
+ gSum += (stack.g = (pg = pixels[yi + 1])) * rbs;
+ bSum += (stack.b = (pb = pixels[yi + 2])) * rbs;
+
+ rInSum += pr;
+ gInSum += pg;
+ bInSum += pb;
+
+ stack = stack.next;
+
+ if (i < (height - 1)) {
+ yp += width;
+ }
+ }
+
+ yi = x;
+ stackIn = stackStart;
+ stackOut = stackEnd;
+ for (y = 0; y < height; y++) {
+ p = yi << 2;
+ pixels[p] = (rSum * mulSum) >> shgSum;
+ pixels[p + 1] = (gSum * mulSum) >> shgSum;
+ pixels[p + 2] = (bSum * mulSum) >> shgSum;
+
+ rSum -= rOutSum;
+ gSum -= gOutSum;
+ bSum -= bOutSum;
+
+ rOutSum -= stackIn.r;
+ gOutSum -= stackIn.g;
+ bOutSum -= stackIn.b;
+
+ p = (x + (((p = y + radiusPlus1) < (height - 1) ? p : (height - 1)) * width)) << 2;
+
+ rSum += (rInSum += (stackIn.r = pixels[p]));
+ gSum += (gInSum += (stackIn.g = pixels[p + 1]));
+ bSum += (bInSum += (stackIn.b = pixels[p + 2]));
+
+ stackIn = stackIn.next;
+
+ rOutSum += (pr = stackOut.r);
+ gOutSum += (pg = stackOut.g);
+ bOutSum += (pb = stackOut.b);
+
+ rInSum -= pr;
+ gInSum -= pg;
+ bInSum -= pb;
+
+ stackOut = stackOut.next;
+
+ yi += width;
+ }
+ }
+
+ context.putImageData(imageData, 0, 0);
+
+};
+
+/**
+ * Defines a new helper object for Stack Blur Algorithm.
+ */
+function BlurStack() {
+ this.r = 0;
+ this.g = 0;
+ this.b = 0;
+ this.next = null;
+}
+
+/**
+ * Defines a gravity matrix object which handles collision detection.
+ * @param x number of columns in the matrix
+ * @param y number of rows in the matrix
+ * @param r grid size
+ */
+function CollisionMatrix(x, y, r) {
+ this.resolution = r;
+ this.xc = x;
+ this.yc = y;
+ this.matrix = new Array(x);
+ for (var i = 0; i <= (x + 5); i++) {
+ this.matrix[i] = new Array(y);
+ for (var j = 0; j <= (y + 5); ++j) {
+ this.matrix[i][j] = new DropItem(null);
+ }
+ }
+}
+
+/**
+ * Updates position of the given drop on the collision matrix.
+ * @param drop raindrop to be positioned/repositioned
+ * @param forceDelete if true the raindrop will be removed from the matrix
+ * @returns collisions if any
+ */
+CollisionMatrix.prototype.update = function(drop, forceDelete) {
+ if (drop.gid) {
+ if (!this.matrix[drop.gmx] || !this.matrix[drop.gmx][drop.gmy]) {
+ return null;
+ }
+ this.matrix[drop.gmx][drop.gmy].remove(drop);
+ if (forceDelete) {
+ return null;
+ }
+
+ drop.gmx = Math.floor(drop.x / this.resolution);
+ drop.gmy = Math.floor(drop.y / this.resolution);
+ if (!this.matrix[drop.gmx] || !this.matrix[drop.gmx][drop.gmy]) {
+ return null;
+ }
+ this.matrix[drop.gmx][drop.gmy].add(drop);
+
+ var collisions = this.collisions(drop);
+ if (collisions && collisions.next != null) {
+ return collisions.next;
+ }
+ } else {
+ drop.gid = Math.random().toString(36).substr(2, 9);
+ drop.gmx = Math.floor(drop.x / this.resolution);
+ drop.gmy = Math.floor(drop.y / this.resolution);
+ if (!this.matrix[drop.gmx] || !this.matrix[drop.gmx][drop.gmy]) {
+ return null;
+ }
+
+ this.matrix[drop.gmx][drop.gmy].add(drop);
+ }
+ return null;
+};
+
+/**
+ * Looks for collisions with the given raindrop.
+ * @param drop raindrop to be checked
+ * @returns DropItem list of drops that collide with it
+ */
+CollisionMatrix.prototype.collisions = function(drop) {
+ var item = new DropItem(null);
+ var first = item;
+
+ item = this.addAll(item, drop.gmx - 1, drop.gmy + 1);
+ item = this.addAll(item, drop.gmx, drop.gmy + 1);
+ item = this.addAll(item, drop.gmx + 1, drop.gmy + 1);
+
+ return first;
+};
+
+/**
+ * Appends all found drop at a given location to the given item.
+ * @param to item to which the results will be appended to
+ * @param x x position in the matrix
+ * @param y y position in the matrix
+ * @returns last discovered item on the list
+ */
+CollisionMatrix.prototype.addAll = function(to, x, y) {
+ if (x > 0 && y > 0 && x < this.xc && y < this.yc) {
+ var items = this.matrix[x][y];
+ while (items.next != null) {
+ items = items.next;
+ to.next = new DropItem(items.drop);
+ to = to.next;
+ }
+ }
+ return to;
+};
+
+/**
+ * Removed the drop from its current position
+ * @param drop to be removed
+ */
+CollisionMatrix.prototype.remove = function(drop) {
+ this.matrix[drop.gmx][drop.gmy].remove(drop);
+};
+
+/**
+ * Defines a linked list item.
+ */
+function DropItem(drop) {
+ this.drop = drop;
+ this.next = null;
+}
+
+/**
+ * Adds the raindrop to the end of the list.
+ * @param drop raindrop to be added
+ */
+DropItem.prototype.add = function(drop) {
+ var item = this;
+ while (item.next != null) {
+ item = item.next;
+ }
+ item.next = new DropItem(drop);
+};
+
+/**
+ * Removes the raindrop from the list.
+ * @param drop raindrop to be removed
+ */
+DropItem.prototype.remove = function(drop) {
+ var item = this;
+ var prevItem = null;
+ while (item.next != null) {
+ prevItem = item;
+ item = item.next;
+ if (item.drop.gid === drop.gid) {
+ prevItem.next = item.next;
+ }
+ }
+};
diff --git a/index.html b/index.html
index 9385e04..d1fa125 100644
--- a/index.html
+++ b/index.html
@@ -7,20 +7,16 @@
-
+
- https://github.com/maroslaw/rainyday.js/blob/master/demo2.html
+
+
+
+
![]()
-
-