sakura/cdn/js/src/06.activate-power-mode.js

(function webpackUniversalModuleDefinition(root, factory) {
	if(typeof exports === 'object' && typeof module === 'object')
		module.exports = factory();
	else if(typeof define === 'function' && define.amd)
		define([], factory);
	else if(typeof exports === 'object')
		exports["POWERMODE"] = factory();
	else
		root["POWERMODE"] = factory();
})(this, function() {
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/* 0 */
/***/ (function(module, exports, __webpack_require__) {

	'use strict';

	var canvas = document.createElement('canvas');
	canvas.width = window.innerWidth;
	canvas.height = window.innerHeight;
	canvas.style.cssText = 'position:fixed;top:0;left:0;pointer-events:none;z-index:999999';
	window.addEventListener('resize', function () {
	    canvas.width = window.innerWidth;
	    canvas.height = window.innerHeight;
	});
	document.body.appendChild(canvas);
	var context = canvas.getContext('2d');
	var particles = [];
	var particlePointer = 0;
	var rendering = false;

	POWERMODE.shake = true;

	function getRandom(min, max) {
	    return Math.random() * (max - min) + min;
	}

	function getColor(el) {
	    if (POWERMODE.colorful) {
	        var u = getRandom(0, 360);
	        return 'hsla(' + getRandom(u - 10, u + 10) + ', 100%, ' + getRandom(50, 80) + '%, ' + 1 + ')';
	    } else {
	        return window.getComputedStyle(el).color;
	    }
	}

	function getCaret() {
	    var el = document.activeElement;
	    var bcr;
	    if (el.tagName === 'TEXTAREA' ||
	        (el.tagName === 'INPUT' && el.getAttribute('type') === 'text')) {
	        var offset = __webpack_require__(1)(el, el.selectionEnd);
	        bcr = el.getBoundingClientRect();
	        return {
	            x: offset.left + bcr.left,
	            y: offset.top + bcr.top,
	            color: getColor(el)
	        };
	    }
	    var selection = window.getSelection();
	    if (selection.rangeCount) {
	        var range = selection.getRangeAt(0);
	        var startNode = range.startContainer;
	        if (startNode.nodeType === document.TEXT_NODE) {
	            startNode = startNode.parentNode;
	        }
	        bcr = range.getBoundingClientRect();
	        return {
	            x: bcr.left,
	            y: bcr.top,
	            color: getColor(startNode)
	        };
	    }
	    return { x: 0, y: 0, color: 'transparent' };
	}

	function createParticle(x, y, color) {
	    return {
	        x: x,
	        y: y,
	        alpha: 1,
	        color: color,
	        velocity: {
	            x: -1 + Math.random() * 2,
	            y: -3.5 + Math.random() * 2
	        }
	    };
	}

	function POWERMODE() {
	    { // spawn particles
	        var caret = getCaret();
	        var numParticles = 5 + Math.round(Math.random() * 10);
	        while (numParticles--) {
	            particles[particlePointer] = createParticle(caret.x, caret.y, caret.color);
	            particlePointer = (particlePointer + 1) % 500;
	        }
	    }
	    { // shake screen
	        if (POWERMODE.shake) {
	            var intensity = 1 + 2 * Math.random();
	            var x = intensity * (Math.random() > 0.5 ? -1 : 1);
	            var y = intensity * (Math.random() > 0.5 ? -1 : 1);
	            document.body.style.marginLeft = x + 'px';
	            document.body.style.marginTop = y + 'px';
	            setTimeout(function() {
	                document.body.style.marginLeft = '';
	                document.body.style.marginTop = '';
	            }, 75);
	        }
	    }
	    if(!rendering){
	        requestAnimationFrame(loop);
	    }
	};
	POWERMODE.colorful = false;

	function loop() {
	    rendering = true;
	    context.clearRect(0, 0, canvas.width, canvas.height);
	    var rendered = false;
	    var rect = canvas.getBoundingClientRect();
	    for (var i = 0; i < particles.length; ++i) {
	        var particle = particles[i];
	        if (particle.alpha <= 0.1) continue;
	        particle.velocity.y += 0.075;
	        particle.x += particle.velocity.x;
	        particle.y += particle.velocity.y;
	        particle.alpha *= 0.96;
	        context.globalAlpha = particle.alpha;
	        context.fillStyle = particle.color;
	        context.fillRect(
	            Math.round(particle.x - 1.5) - rect.left,
	            Math.round(particle.y - 1.5) - rect.top,
	            3, 3
	        );
	        rendered = true;
	    }
	    if(rendered){
	        requestAnimationFrame(loop);
	    }else{
	        rendering = false;
	    }
	}

	module.exports = POWERMODE;


/***/ }),
/* 1 */
/***/ (function(module, exports) {

	/* jshint browser: true */

	(function () {

	// The properties that we copy into a mirrored div.
	// Note that some browsers, such as Firefox,
	// do not concatenate properties, i.e. padding-top, bottom etc. -> padding,
	// so we have to do every single property specifically.
	var properties = [
	  'direction',  // RTL support
	  'boxSizing',
	  'width',  // on Chrome and IE, exclude the scrollbar, so the mirror div wraps exactly as the textarea does
	  'height',
	  'overflowX',
	  'overflowY',  // copy the scrollbar for IE

	  'borderTopWidth',
	  'borderRightWidth',
	  'borderBottomWidth',
	  'borderLeftWidth',
	  'borderStyle',

	  'paddingTop',
	  'paddingRight',
	  'paddingBottom',
	  'paddingLeft',

	  // https://developer.mozilla.org/en-US/docs/Web/CSS/font
	  'fontStyle',
	  'fontVariant',
	  'fontWeight',
	  'fontStretch',
	  'fontSize',
	  'fontSizeAdjust',
	  'lineHeight',
	  'fontFamily',

	  'textAlign',
	  'textTransform',
	  'textIndent',
	  'textDecoration',  // might not make a difference, but better be safe

	  'letterSpacing',
	  'wordSpacing',

	  'tabSize',
	  'MozTabSize'

	];

	var isFirefox = window.mozInnerScreenX != null;

	function getCaretCoordinates(element, position, options) {

	  var debug = options && options.debug || false;
	  if (debug) {
	    var el = document.querySelector('#input-textarea-caret-position-mirror-div');
	    if ( el ) { el.parentNode.removeChild(el); }
	  }

	  // mirrored div
	  var div = document.createElement('div');
	  div.id = 'input-textarea-caret-position-mirror-div';
	  document.body.appendChild(div);

	  var style = div.style;
	  var computed = window.getComputedStyle? getComputedStyle(element) : element.currentStyle;  // currentStyle for IE < 9

	  // default textarea styles
	  style.whiteSpace = 'pre-wrap';
	  if (element.nodeName !== 'INPUT')
	    style.wordWrap = 'break-word';  // only for textarea-s

	  // position off-screen
	  style.position = 'absolute';  // required to return coordinates properly
	  if (!debug)
	    style.visibility = 'hidden';  // not 'display: none' because we want rendering

	  // transfer the element's properties to the div
	  properties.forEach(function (prop) {
	    style[prop] = computed[prop];
	  });

	  if (isFirefox) {
	    // Firefox lies about the overflow property for textareas: https://bugzilla.mozilla.org/show_bug.cgi?id=984275
	    if (element.scrollHeight > parseInt(computed.height))
	      style.overflowY = 'scroll';
	  } else {
	    style.overflow = 'hidden';  // for Chrome to not render a scrollbar; IE keeps overflowY = 'scroll'
	  }

	  div.textContent = element.value.substring(0, position);
	  // the second special handling for input type="text" vs textarea: spaces need to be replaced with non-breaking spaces - http://stackoverflow.com/a/13402035/1269037
	  if (element.nodeName === 'INPUT')
	    div.textContent = div.textContent.replace(/\s/g, "\u00a0");

	  var span = document.createElement('span');
	  // Wrapping must be replicated *exactly*, including when a long word gets
	  // onto the next line, with whitespace at the end of the line before (#7).
	  // The  *only* reliable way to do that is to copy the *entire* rest of the
	  // textarea's content into the <span> created at the caret position.
	  // for inputs, just '.' would be enough, but why bother?
	  span.textContent = element.value.substring(position) || '.';  // || because a completely empty faux span doesn't render at all
	  div.appendChild(span);

	  var coordinates = {
	    top: span.offsetTop + parseInt(computed['borderTopWidth']),
	    left: span.offsetLeft + parseInt(computed['borderLeftWidth'])
	  };

	  if (debug) {
	    span.style.backgroundColor = '#aaa';
	  } else {
	    document.body.removeChild(div);
	  }

	  return coordinates;
	}

	if (typeof module != "undefined" && typeof module.exports != "undefined") {
	  module.exports = getCaretCoordinates;
	} else {
	  window.getCaretCoordinates = getCaretCoordinates;
	}

	}());

/***/ })
/******/ ])
});
;