92 lines
2.4 KiB
JavaScript
92 lines
2.4 KiB
JavaScript
/* global $ */
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/**
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* Utility functions.
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*/
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var Util = (function (my) {
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/**
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* Returns the text width for the given element.
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*
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* @param el the element
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*/
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my.getTextWidth = function (el) {
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return (el.clientWidth + 1);
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};
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/**
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* Returns the text height for the given element.
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*
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* @param el the element
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*/
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my.getTextHeight = function (el) {
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return (el.clientHeight + 1);
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};
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/**
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* Casts the given number to integer.
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*
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* @param number the number to cast
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*/
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my.toInteger = function (number) {
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return Math.round(Number(number));
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};
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/**
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* Plays the sound given by id.
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*
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* @param id the identifier of the audio element.
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*/
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my.playSoundNotification = function (id) {
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document.getElementById(id).play();
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};
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/**
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* Escapes the given text.
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*/
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my.escapeHtml = function (unsafeText) {
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return $('<div/>').text(unsafeText).html();
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};
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my.imageToGrayScale = function (canvas) {
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var context = canvas.getContext('2d');
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var imgData = context.getImageData(0, 0, canvas.width, canvas.height);
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var pixels = imgData.data;
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for (var i = 0, n = pixels.length; i < n; i += 4) {
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var grayscale
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= pixels[i] * .3 + pixels[i+1] * .59 + pixels[i+2] * .11;
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pixels[i ] = grayscale; // red
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pixels[i+1] = grayscale; // green
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pixels[i+2] = grayscale; // blue
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// pixels[i+3] is alpha
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}
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// redraw the image in black & white
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context.putImageData(imgData, 0, 0);
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};
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my.setTooltip = function (element, tooltipText, position) {
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element.setAttribute("data-content", tooltipText);
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element.setAttribute("data-toggle", "popover");
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element.setAttribute("data-placement", position);
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element.setAttribute("data-html", true);
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element.setAttribute("data-container", "body");
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};
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my.createExpBackoffTimer = function (step) {
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var count = 1;
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return function (reset) {
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// Reset call
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if (reset) {
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count = 1;
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return;
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}
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// Calculate next timeout
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var timeout = Math.pow(2, count - 1);
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count += 1;
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return timeout * step;
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};
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};
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return my;
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}(Util || {}));
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