+
+/**
+ * Returns the context's pixel ratio, which is the ratio between the device
+ * pixel ratio and the backing store ratio. Typically this is 1 for conventional
+ * displays, and > 1 for HiDPI displays (such as the Retina MBP).
+ * See http://www.html5rocks.com/en/tutorials/canvas/hidpi/ for more details.
+ *
+ * @param {!CanvasRenderingContext2D} context The canvas's 2d context.
+ * @return {number} The ratio of the device pixel ratio and the backing store
+ * ratio for the specified context.
+ */
+Dygraph.getContextPixelRatio = function(context) {
+ try {
+ var devicePixelRatio = window.devicePixelRatio;
+ var backingStoreRatio = context.webkitBackingStorePixelRatio ||
+ context.mozBackingStorePixelRatio ||
+ context.msBackingStorePixelRatio ||
+ context.oBackingStorePixelRatio ||
+ context.backingStorePixelRatio || 1;
+ if (devicePixelRatio !== undefined) {
+ return devicePixelRatio / backingStoreRatio;
+ } else {
+ // At least devicePixelRatio must be defined for this ratio to make sense.
+ // We default backingStoreRatio to 1: this does not exist on some browsers
+ // (i.e. desktop Chrome).
+ return 1;
+ }
+ } catch (e) {
+ return 1;
+ }
+};
+
+/**
+ * Checks whether the user is on an Android browser.
+ * Android does not fully support the <canvas> tag, e.g. w/r/t/ clipping.
+ * @return {boolean}
+ * @private
+ */
+Dygraph.isAndroid = function() {
+ return (/Android/).test(navigator.userAgent);
+};
+
+
+/**
+ * TODO(danvk): use @template here when it's better supported for classes.
+ * @param {!Array} array
+ * @param {number} start
+ * @param {number} length
+ * @param {function(!Array,?):boolean=} predicate
+ * @constructor
+ */
+Dygraph.Iterator = function(array, start, length, predicate) {
+ start = start || 0;
+ length = length || array.length;
+ this.hasNext = true; // Use to identify if there's another element.
+ this.peek = null; // Use for look-ahead
+ this.start_ = start;
+ this.array_ = array;
+ this.predicate_ = predicate;
+ this.end_ = Math.min(array.length, start + length);
+ this.nextIdx_ = start - 1; // use -1 so initial advance works.
+ this.next(); // ignoring result.
+};
+
+/**
+ * @return {Object}
+ */
+Dygraph.Iterator.prototype.next = function() {
+ if (!this.hasNext) {
+ return null;
+ }
+ var obj = this.peek;
+
+ var nextIdx = this.nextIdx_ + 1;
+ var found = false;
+ while (nextIdx < this.end_) {
+ if (!this.predicate_ || this.predicate_(this.array_, nextIdx)) {
+ this.peek = this.array_[nextIdx];
+ found = true;
+ break;
+ }
+ nextIdx++;
+ }
+ this.nextIdx_ = nextIdx;
+ if (!found) {
+ this.hasNext = false;
+ this.peek = null;
+ }
+ return obj;
+};
+
+/**
+ * Returns a new iterator over array, between indexes start and
+ * start + length, and only returns entries that pass the accept function
+ *
+ * @param {!Array} array the array to iterate over.
+ * @param {number} start the first index to iterate over, 0 if absent.
+ * @param {number} length the number of elements in the array to iterate over.
+ * This, along with start, defines a slice of the array, and so length
+ * doesn't imply the number of elements in the iterator when accept doesn't
+ * always accept all values. array.length when absent.
+ * @param {function(?):boolean=} opt_predicate a function that takes
+ * parameters array and idx, which returns true when the element should be
+ * returned. If omitted, all elements are accepted.
+ * @private
+ */
+Dygraph.createIterator = function(array, start, length, opt_predicate) {
+ return new Dygraph.Iterator(array, start, length, opt_predicate);
+};
+
+// Shim layer with setTimeout fallback.
+// From: http://paulirish.com/2011/requestanimationframe-for-smart-animating/
+// Should be called with the window context:
+// Dygraph.requestAnimFrame.call(window, function() {})
+Dygraph.requestAnimFrame = (function() {
+ return window.requestAnimationFrame ||
+ window.webkitRequestAnimationFrame ||
+ window.mozRequestAnimationFrame ||
+ window.oRequestAnimationFrame ||
+ window.msRequestAnimationFrame ||
+ function (callback) {
+ window.setTimeout(callback, 1000 / 60);
+ };
+})();
+
+/**
+ * Call a function at most maxFrames times at an attempted interval of
+ * framePeriodInMillis, then call a cleanup function once. repeatFn is called
+ * once immediately, then at most (maxFrames - 1) times asynchronously. If
+ * maxFrames==1, then cleanup_fn() is also called synchronously. This function
+ * is used to sequence animation.
+ * @param {function(number)} repeatFn Called repeatedly -- takes the frame
+ * number (from 0 to maxFrames-1) as an argument.
+ * @param {number} maxFrames The max number of times to call repeatFn
+ * @param {number} framePeriodInMillis Max requested time between frames.
+ * @param {function()} cleanupFn A function to call after all repeatFn calls.
+ * @private
+ */
+Dygraph.repeatAndCleanup = function(repeatFn, maxFrames, framePeriodInMillis,
+ cleanupFn) {
+ var frameNumber = 0;
+ var previousFrameNumber;
+ var startTime = new Date().getTime();
+ repeatFn(frameNumber);
+ if (maxFrames == 1) {
+ cleanupFn();
+ return;
+ }
+ var maxFrameArg = maxFrames - 1;
+
+ (function loop() {
+ if (frameNumber >= maxFrames) return;
+ Dygraph.requestAnimFrame.call(window, function() {
+ // Determine which frame to draw based on the delay so far. Will skip
+ // frames if necessary.
+ var currentTime = new Date().getTime();
+ var delayInMillis = currentTime - startTime;
+ previousFrameNumber = frameNumber;
+ frameNumber = Math.floor(delayInMillis / framePeriodInMillis);
+ var frameDelta = frameNumber - previousFrameNumber;
+ // If we predict that the subsequent repeatFn call will overshoot our
+ // total frame target, so our last call will cause a stutter, then jump to
+ // the last call immediately. If we're going to cause a stutter, better
+ // to do it faster than slower.
+ var predictOvershootStutter = (frameNumber + frameDelta) > maxFrameArg;
+ if (predictOvershootStutter || (frameNumber >= maxFrameArg)) {
+ repeatFn(maxFrameArg); // Ensure final call with maxFrameArg.
+ cleanupFn();
+ } else {
+ if (frameDelta !== 0) { // Don't call repeatFn with duplicate frames.
+ repeatFn(frameNumber);
+ }
+ loop();
+ }
+ });
+ })();
+};
+
+// A whitelist of options that do not change pixel positions.
+var pixelSafeOptions = {
+ 'annotationClickHandler': true,
+ 'annotationDblClickHandler': true,
+ 'annotationMouseOutHandler': true,
+ 'annotationMouseOverHandler': true,
+ 'axisLabelColor': true,
+ 'axisLineColor': true,
+ 'axisLineWidth': true,
+ 'clickCallback': true,
+ 'drawCallback': true,
+ 'drawHighlightPointCallback': true,
+ 'drawPoints': true,
+ 'drawPointCallback': true,
+ 'drawXGrid': true,
+ 'drawYGrid': true,
+ 'fillAlpha': true,
+ 'gridLineColor': true,
+ 'gridLineWidth': true,
+ 'hideOverlayOnMouseOut': true,
+ 'highlightCallback': true,
+ 'highlightCircleSize': true,
+ 'interactionModel': true,
+ 'isZoomedIgnoreProgrammaticZoom': true,
+ 'labelsDiv': true,
+ 'labelsDivStyles': true,
+ 'labelsDivWidth': true,
+ 'labelsKMB': true,
+ 'labelsKMG2': true,
+ 'labelsSeparateLines': true,
+ 'labelsShowZeroValues': true,
+ 'legend': true,
+ 'panEdgeFraction': true,
+ 'pixelsPerYLabel': true,
+ 'pointClickCallback': true,
+ 'pointSize': true,
+ 'rangeSelectorPlotFillColor': true,
+ 'rangeSelectorPlotStrokeColor': true,
+ 'showLabelsOnHighlight': true,
+ 'showRoller': true,
+ 'strokeWidth': true,
+ 'underlayCallback': true,
+ 'unhighlightCallback': true,
+ 'zoomCallback': true
+};
+
+/**
+ * This function will scan the option list and determine if they
+ * require us to recalculate the pixel positions of each point.
+ * TODO: move this into dygraph-options.js
+ * @param {!Array.<string>} labels a list of options to check.
+ * @param {!Object} attrs
+ * @return {boolean} true if the graph needs new points else false.
+ * @private
+ */
+Dygraph.isPixelChangingOptionList = function(labels, attrs) {
+ // Assume that we do not require new points.
+ // This will change to true if we actually do need new points.
+
+ // Create a dictionary of series names for faster lookup.
+ // If there are no labels, then the dictionary stays empty.
+ var seriesNamesDictionary = { };
+ if (labels) {
+ for (var i = 1; i < labels.length; i++) {
+ seriesNamesDictionary[labels[i]] = true;
+ }
+ }
+
+ // Scan through a flat (i.e. non-nested) object of options.
+ // Returns true/false depending on whether new points are needed.
+ var scanFlatOptions = function(options) {
+ for (var property in options) {
+ if (options.hasOwnProperty(property) &&
+ !pixelSafeOptions[property]) {
+ return true;
+ }
+ }
+ return false;
+ };
+
+ // Iterate through the list of updated options.
+ for (var property in attrs) {
+ if (!attrs.hasOwnProperty(property)) continue;
+
+ // Find out of this field is actually a series specific options list.
+ if (property == 'highlightSeriesOpts' ||
+ (seriesNamesDictionary[property] && !attrs.series)) {
+ // This property value is a list of options for this series.
+ if (scanFlatOptions(attrs[property])) return true;
+ } else if (property == 'series' || property == 'axes') {
+ // This is twice-nested options list.
+ var perSeries = attrs[property];
+ for (var series in perSeries) {
+ if (perSeries.hasOwnProperty(series) &&
+ scanFlatOptions(perSeries[series])) {
+ return true;
+ }
+ }
+ } else {
+ // If this was not a series specific option list, check if it's a pixel
+ // changing property.
+ if (!pixelSafeOptions[property]) return true;
+ }
+ }
+
+ return false;
+};
+
+Dygraph.Circles = {
+ DEFAULT : function(g, name, ctx, canvasx, canvasy, color, radius) {
+ ctx.beginPath();
+ ctx.fillStyle = color;
+ ctx.arc(canvasx, canvasy, radius, 0, 2 * Math.PI, false);
+ ctx.fill();
+ }
+ // For more shapes, include extras/shapes.js
+};
+
+/**
+ * To create a "drag" interaction, you typically register a mousedown event
+ * handler on the element where the drag begins. In that handler, you register a
+ * mouseup handler on the window to determine when the mouse is released,
+ * wherever that release happens. This works well, except when the user releases
+ * the mouse over an off-domain iframe. In that case, the mouseup event is
+ * handled by the iframe and never bubbles up to the window handler.
+ *
+ * To deal with this issue, we cover iframes with high z-index divs to make sure
+ * they don't capture mouseup.
+ *
+ * Usage:
+ * element.addEventListener('mousedown', function() {
+ * var tarper = new Dygraph.IFrameTarp();
+ * tarper.cover();
+ * var mouseUpHandler = function() {
+ * ...
+ * window.removeEventListener(mouseUpHandler);
+ * tarper.uncover();
+ * };
+ * window.addEventListener('mouseup', mouseUpHandler);
+ * };
+ *
+ * @constructor
+ */
+Dygraph.IFrameTarp = function() {
+ /** @type {Array.<!HTMLDivElement>} */
+ this.tarps = [];
+};
+
+/**
+ * Find all the iframes in the document and cover them with high z-index
+ * transparent divs.
+ */
+Dygraph.IFrameTarp.prototype.cover = function() {
+ var iframes = document.getElementsByTagName("iframe");
+ for (var i = 0; i < iframes.length; i++) {
+ var iframe = iframes[i];
+ var pos = Dygraph.findPos(iframe),
+ x = pos.x,
+ y = pos.y,
+ width = iframe.offsetWidth,
+ height = iframe.offsetHeight;
+
+ var div = document.createElement("div");
+ div.style.position = "absolute";
+ div.style.left = x + 'px';
+ div.style.top = y + 'px';
+ div.style.width = width + 'px';
+ div.style.height = height + 'px';
+ div.style.zIndex = 999;
+ document.body.appendChild(div);
+ this.tarps.push(div);
+ }
+};
+
+/**
+ * Remove all the iframe covers. You should call this in a mouseup handler.
+ */
+Dygraph.IFrameTarp.prototype.uncover = function() {
+ for (var i = 0; i < this.tarps.length; i++) {
+ this.tarps[i].parentNode.removeChild(this.tarps[i]);
+ }
+ this.tarps = [];
+};
+
+/**
+ * Determine whether |data| is delimited by CR, CRLF, LF, LFCR.
+ * @param {string} data
+ * @return {?string} the delimiter that was detected (or null on failure).
+ */
+Dygraph.detectLineDelimiter = function(data) {
+ for (var i = 0; i < data.length; i++) {
+ var code = data.charAt(i);
+ if (code === '\r') {
+ // Might actually be "\r\n".
+ if (((i + 1) < data.length) && (data.charAt(i + 1) === '\n')) {
+ return '\r\n';
+ }
+ return code;
+ }
+ if (code === '\n') {
+ // Might actually be "\n\r".
+ if (((i + 1) < data.length) && (data.charAt(i + 1) === '\r')) {
+ return '\n\r';
+ }
+ return code;
+ }
+ }
+
+ return null;
+};
+
+/**
+ * Is one node contained by another?
+ * @param {Node} containee The contained node.
+ * @param {Node} container The container node.
+ * @return {boolean} Whether containee is inside (or equal to) container.
+ * @private
+ */
+Dygraph.isNodeContainedBy = function(containee, container) {
+ if (container === null || containee === null) {
+ return false;
+ }
+ var containeeNode = /** @type {Node} */ (containee);
+ while (containeeNode && containeeNode !== container) {
+ containeeNode = containeeNode.parentNode;
+ }
+ return (containeeNode === container);
+};
+
+
+// This masks some numeric issues in older versions of Firefox,
+// where 1.0/Math.pow(10,2) != Math.pow(10,-2).
+/** @type {function(number,number):number} */
+Dygraph.pow = function(base, exp) {
+ if (exp < 0) {
+ return 1.0 / Math.pow(base, -exp);
+ }
+ return Math.pow(base, exp);
+};
+
+/**
+ * Converts any valid CSS color (hex, rgb(), named color) to an RGB tuple.
+ *
+ * @param {!string} colorStr Any valid CSS color string.
+ * @return {{r:number,g:number,b:number}} Parsed RGB tuple.
+ * @private
+ */
+Dygraph.toRGB_ = function(colorStr) {
+ // TODO(danvk): cache color parses to avoid repeated DOM manipulation.
+ var div = document.createElement('div');
+ div.style.backgroundColor = colorStr;
+ div.style.visibility = 'hidden';
+ document.body.appendChild(div);
+ var rgbStr = window.getComputedStyle(div, null).backgroundColor;
+ document.body.removeChild(div);
+ var bits = /^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/.exec(rgbStr);
+ return {
+ r: parseInt(bits[1], 10),
+ g: parseInt(bits[2], 10),
+ b: parseInt(bits[3], 10)
+ };
+};
+
+/**
+ * Checks whether the browser supports the <canvas> tag.
+ * @param {HTMLCanvasElement=} opt_canvasElement Pass a canvas element as an
+ * optimization if you have one.
+ * @return {boolean} Whether the browser supports canvas.
+ */
+Dygraph.isCanvasSupported = function(opt_canvasElement) {
+ var canvas;
+ try {
+ canvas = opt_canvasElement || document.createElement("canvas");
+ canvas.getContext("2d");
+ }
+ catch (e) {
+ var ie = navigator.appVersion.match(/MSIE (\d\.\d)/);
+ var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);
+ if ((!ie) || (ie[1] < 6) || (opera))
+ return false;
+ return true;
+ }
+ return true;
+};
+
+/**
+ * Parses the value as a floating point number. This is like the parseFloat()
+ * built-in, but with a few differences:
+ * - the empty string is parsed as null, rather than NaN.
+ * - if the string cannot be parsed at all, an error is logged.
+ * If the string can't be parsed, this method returns null.
+ * @param {string} x The string to be parsed
+ * @param {number=} opt_line_no The line number from which the string comes.
+ * @param {string=} opt_line The text of the line from which the string comes.
+ */
+Dygraph.parseFloat_ = function(x, opt_line_no, opt_line) {
+ var val = parseFloat(x);
+ if (!isNaN(val)) return val;
+
+ // Try to figure out what happeend.
+ // If the value is the empty string, parse it as null.
+ if (/^ *$/.test(x)) return null;
+
+ // If it was actually "NaN", return it as NaN.
+ if (/^ *nan *$/i.test(x)) return NaN;
+
+ // Looks like a parsing error.
+ var msg = "Unable to parse '" + x + "' as a number";
+ if (opt_line !== undefined && opt_line_no !== undefined) {
+ msg += " on line " + (1+(opt_line_no||0)) + " ('" + opt_line + "') of CSV.";
+ }
+ console.error(msg);
+
+ return null;
+};
+
+})();