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-
-
- (function() {
-
- var waveMaxRadius = 150;
- //
- // INK EQUATIONS
- //
- function waveRadiusFn(touchDownMs, touchUpMs, anim) {
- // Convert from ms to s
- var touchDown = touchDownMs / 1000;
- var touchUp = touchUpMs / 1000;
- var totalElapsed = touchDown + touchUp;
- var ww = anim.width, hh = anim.height;
- // use diagonal size of container to avoid floating point math sadness
- var waveRadius = Math.min(Math.sqrt(ww * ww + hh * hh), waveMaxRadius) * 1.1 + 5;
- var duration = 1.1 - .2 * (waveRadius / waveMaxRadius);
- var tt = (totalElapsed / duration);
-
- var size = waveRadius * (1 - Math.pow(80, -tt));
- return Math.abs(size);
- }
-
- function waveOpacityFn(td, tu, anim) {
- // Convert from ms to s.
- var touchDown = td / 1000;
- var touchUp = tu / 1000;
- var totalElapsed = touchDown + touchUp;
-
- if (tu <= 0) { // before touch up
- return anim.initialOpacity;
- }
- return Math.max(0, anim.initialOpacity - touchUp * anim.opacityDecayVelocity);
- }
-
- function waveOuterOpacityFn(td, tu, anim) {
- // Convert from ms to s.
- var touchDown = td / 1000;
- var touchUp = tu / 1000;
-
- // Linear increase in background opacity, capped at the opacity
- // of the wavefront (waveOpacity).
- var outerOpacity = touchDown * 0.3;
- var waveOpacity = waveOpacityFn(td, tu, anim);
- return Math.max(0, Math.min(outerOpacity, waveOpacity));
- }
-
- // Determines whether the wave should be completely removed.
- function waveDidFinish(wave, radius, anim) {
- var waveOpacity = waveOpacityFn(wave.tDown, wave.tUp, anim);
-
- // If the wave opacity is 0 and the radius exceeds the bounds
- // of the element, then this is finished.
- return waveOpacity < 0.01 && radius >= Math.min(wave.maxRadius, waveMaxRadius);
- };
-
- function waveAtMaximum(wave, radius, anim) {
- var waveOpacity = waveOpacityFn(wave.tDown, wave.tUp, anim);
-
- return waveOpacity >= anim.initialOpacity && radius >= Math.min(wave.maxRadius, waveMaxRadius);
- }
-
- //
- // DRAWING
- //
- function drawRipple(ctx, x, y, radius, innerAlpha, outerAlpha) {
- // Only animate opacity and transform
- if (outerAlpha !== undefined) {
- ctx.bg.style.opacity = outerAlpha;
- }
- ctx.wave.style.opacity = innerAlpha;
-
- var s = radius / (ctx.containerSize / 2);
- var dx = x - (ctx.containerWidth / 2);
- var dy = y - (ctx.containerHeight / 2);
-
- ctx.wc.style.webkitTransform = 'translate3d(' + dx + 'px,' + dy + 'px,0)';
- ctx.wc.style.transform = 'translate3d(' + dx + 'px,' + dy + 'px,0)';
-
- // 2d transform for safari because of border-radius and overflow:hidden clipping bug.
- // https://bugs.webkit.org/show_bug.cgi?id=98538
- ctx.wave.style.webkitTransform = 'scale(' + s + ',' + s + ')';
- ctx.wave.style.transform = 'scale3d(' + s + ',' + s + ',1)';
- }
-
- //
- // SETUP
- //
- function createWave(elem) {
- var elementStyle = window.getComputedStyle(elem);
- var fgColor = elementStyle.color;
-
- var inner = document.createElement('div');
- inner.style.backgroundColor = fgColor;
- inner.classList.add('wave');
-
- var outer = document.createElement('div');
- outer.classList.add('wave-container');
- outer.appendChild(inner);
-
- var container = elem.$.waves;
- container.appendChild(outer);
-
- elem.$.bg.style.backgroundColor = fgColor;
-
- var wave = {
- bg: elem.$.bg,
- wc: outer,
- wave: inner,
- waveColor: fgColor,
- maxRadius: 0,
- isMouseDown: false,
- mouseDownStart: 0.0,
- mouseUpStart: 0.0,
- tDown: 0,
- tUp: 0
- };
- return wave;
- }
-
- function removeWaveFromScope(scope, wave) {
- if (scope.waves) {
- var pos = scope.waves.indexOf(wave);
- scope.waves.splice(pos, 1);
- // FIXME cache nodes
- wave.wc.remove();
- }
- };
-
- // Shortcuts.
- var pow = Math.pow;
- var now = Date.now;
- if (window.performance && performance.now) {
- now = performance.now.bind(performance);
- }
-
- function cssColorWithAlpha(cssColor, alpha) {
- var parts = cssColor.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
- if (typeof alpha == 'undefined') {
- alpha = 1;
- }
- if (!parts) {
- return 'rgba(255, 255, 255, ' + alpha + ')';
- }
- return 'rgba(' + parts[1] + ', ' + parts[2] + ', ' + parts[3] + ', ' + alpha + ')';
- }
-
- function dist(p1, p2) {
- return Math.sqrt(pow(p1.x - p2.x, 2) + pow(p1.y - p2.y, 2));
- }
-
- function distanceFromPointToFurthestCorner(point, size) {
- var tl_d = dist(point, {x: 0, y: 0});
- var tr_d = dist(point, {x: size.w, y: 0});
- var bl_d = dist(point, {x: 0, y: size.h});
- var br_d = dist(point, {x: size.w, y: size.h});
- return Math.max(tl_d, tr_d, bl_d, br_d);
- }
-
- Polymer('paper-ripple', {
-
- /**
- * The initial opacity set on the wave.
- *
- * @attribute initialOpacity
- * @type number
- * @default 0.25
- */
- initialOpacity: 0.25,
-
- /**
- * How fast (opacity per second) the wave fades out.
- *
- * @attribute opacityDecayVelocity
- * @type number
- * @default 0.8
- */
- opacityDecayVelocity: 0.8,
-
- backgroundFill: true,
- pixelDensity: 2,
-
- eventDelegates: {
- down: 'downAction',
- up: 'upAction'
- },
-
- ready: function() {
- this.waves = [];
- },
-
- downAction: function(e) {
- var wave = createWave(this);
-
- this.cancelled = false;
- wave.isMouseDown = true;
- wave.tDown = 0.0;
- wave.tUp = 0.0;
- wave.mouseUpStart = 0.0;
- wave.mouseDownStart = now();
-
- var rect = this.getBoundingClientRect();
- var width = rect.width;
- var height = rect.height;
- var touchX = e.x - rect.left;
- var touchY = e.y - rect.top;
-
- wave.startPosition = {x:touchX, y:touchY};
-
- if (this.classList.contains("recenteringTouch")) {
- wave.endPosition = {x: width / 2, y: height / 2};
- wave.slideDistance = dist(wave.startPosition, wave.endPosition);
- }
- wave.containerSize = Math.max(width, height);
- wave.containerWidth = width;
- wave.containerHeight = height;
- wave.maxRadius = distanceFromPointToFurthestCorner(wave.startPosition, {w: width, h: height});
-
- // The wave is circular so constrain its container to 1:1
- wave.wc.style.top = (wave.containerHeight - wave.containerSize) / 2 + 'px';
- wave.wc.style.left = (wave.containerWidth - wave.containerSize) / 2 + 'px';
- wave.wc.style.width = wave.containerSize + 'px';
- wave.wc.style.height = wave.containerSize + 'px';
-
- this.waves.push(wave);
-
- if (!this._loop) {
- this._loop = this.animate.bind(this, {
- width: width,
- height: height
- });
- requestAnimationFrame(this._loop);
- }
- // else there is already a rAF
- },
-
- upAction: function() {
- for (var i = 0; i < this.waves.length; i++) {
- // Declare the next wave that has mouse down to be mouse'ed up.
- var wave = this.waves[i];
- if (wave.isMouseDown) {
- wave.isMouseDown = false
- wave.mouseUpStart = now();
- wave.mouseDownStart = 0;
- wave.tUp = 0.0;
- break;
- }
- }
- this._loop && requestAnimationFrame(this._loop);
- },
-
- cancel: function() {
- this.cancelled = true;
- },
-
- animate: function(ctx) {
- var shouldRenderNextFrame = false;
-
- var deleteTheseWaves = [];
- // The oldest wave's touch down duration
- var longestTouchDownDuration = 0;
- var longestTouchUpDuration = 0;
- // Save the last known wave color
- var lastWaveColor = null;
- // wave animation values
- var anim = {
- initialOpacity: this.initialOpacity,
- opacityDecayVelocity: this.opacityDecayVelocity,
- height: ctx.height,
- width: ctx.width
- }
-
- for (var i = 0; i < this.waves.length; i++) {
- var wave = this.waves[i];
-
- if (wave.mouseDownStart > 0) {
- wave.tDown = now() - wave.mouseDownStart;
- }
- if (wave.mouseUpStart > 0) {
- wave.tUp = now() - wave.mouseUpStart;
- }
-
- // Determine how long the touch has been up or down.
- var tUp = wave.tUp;
- var tDown = wave.tDown;
- longestTouchDownDuration = Math.max(longestTouchDownDuration, tDown);
- longestTouchUpDuration = Math.max(longestTouchUpDuration, tUp);
-
- // Obtain the instantenous size and alpha of the ripple.
- var radius = waveRadiusFn(tDown, tUp, anim);
- var waveAlpha = waveOpacityFn(tDown, tUp, anim);
- var waveColor = cssColorWithAlpha(wave.waveColor, waveAlpha);
- lastWaveColor = wave.waveColor;
-
- // Position of the ripple.
- var x = wave.startPosition.x;
- var y = wave.startPosition.y;
-
- // Ripple gravitational pull to the center of the canvas.
- if (wave.endPosition) {
-
- // This translates from the origin to the center of the view based on the max dimension of
- var translateFraction = Math.min(1, radius / wave.containerSize * 2 / Math.sqrt(2) );
-
- x += translateFraction * (wave.endPosition.x - wave.startPosition.x);
- y += translateFraction * (wave.endPosition.y - wave.startPosition.y);
- }
-
- // If we do a background fill fade too, work out the correct color.
- var bgFillColor = null;
- if (this.backgroundFill) {
- var bgFillAlpha = waveOuterOpacityFn(tDown, tUp, anim);
- bgFillColor = cssColorWithAlpha(wave.waveColor, bgFillAlpha);
- }
-
- // Draw the ripple.
- drawRipple(wave, x, y, radius, waveAlpha, bgFillAlpha);
-
- // Determine whether there is any more rendering to be done.
- var maximumWave = waveAtMaximum(wave, radius, anim);
- var waveDissipated = waveDidFinish(wave, radius, anim);
- var shouldKeepWave = !waveDissipated || maximumWave;
- // keep rendering dissipating wave when at maximum radius on upAction
- var shouldRenderWaveAgain = wave.mouseUpStart ? !waveDissipated : !maximumWave;
- shouldRenderNextFrame = shouldRenderNextFrame || shouldRenderWaveAgain;
- if (!shouldKeepWave || this.cancelled) {
- deleteTheseWaves.push(wave);
- }
- }
-
- if (shouldRenderNextFrame) {
- requestAnimationFrame(this._loop);
- }
-
- for (var i = 0; i < deleteTheseWaves.length; ++i) {
- var wave = deleteTheseWaves[i];
- removeWaveFromScope(this, wave);
- }
-
- if (!this.waves.length && this._loop) {
- // clear the background color
- this.$.bg.style.backgroundColor = null;
- this._loop = null;
- this.fire('core-transitionend');
- }
- }
-
- });
-
- })();
-
-