X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-canvas.js;h=4a5ca44c9d5cabeb71f5423cb7019d9b82611270;hb=003f94b51b9ff4f8a52935105dfba0aec2b5fd77;hp=c5eb83523b22d8179e1497bfd5f9904460ece699;hpb=e4182459889d71f9c69157d71ca042f194b4c58f;p=dygraphs.git diff --git a/dygraph-canvas.js b/dygraph-canvas.js index c5eb835..4a5ca44 100644 --- a/dygraph-canvas.js +++ b/dygraph-canvas.js @@ -2,289 +2,23 @@ // All Rights Reserved. /** - * @fileoverview Based on PlotKit, but modified to meet the needs of dygraphs. + * @fileoverview Based on PlotKit.CanvasRenderer, but modified to meet the + * needs of dygraphs. + * * In particular, support for: * - grid overlays * - error bars * - dygraphs attribute system - * - * High level overview of classes: - * - * - DygraphLayout - * This contains all the data to be charted. - * It uses data coordinates, but also records the chart range (in data - * coordinates) and hence is able to calculate percentage positions ('In - * this view, Point A lies 25% down the x-axis.') - * Two things that it does not do are: - * 1. Record pixel coordinates for anything. - * 2. (oddly) determine anything about the layout of chart elements. - * The naming is a vestige of Dygraph's original PlotKit roots. - * - * - DygraphCanvasRenderer - * This class determines the charting area (in pixel coordinates), maps the - * percentage coordinates in the DygraphLayout to pixels and draws them. - * It's also responsible for creating chart DOM elements, i.e. annotations, - * tick mark labels, the title and the x/y-axis labels. */ /** - * Creates a new DygraphLayout object. - * @return {Object} The DygraphLayout object - */ -DygraphLayout = function(dygraph) { - this.dygraph_ = dygraph; - this.datasets = new Array(); - this.annotations = new Array(); - this.yAxes_ = null; - - // TODO(danvk): it's odd that xTicks_ and yTicks_ are inputs, but xticks and - // yticks are outputs. Clean this up. - this.xTicks_ = null; - this.yTicks_ = null; -}; - -DygraphLayout.prototype.attr_ = function(name) { - return this.dygraph_.attr_(name); -}; - -DygraphLayout.prototype.addDataset = function(setname, set_xy) { - this.datasets[setname] = set_xy; -}; - -DygraphLayout.prototype.setAnnotations = function(ann) { - // The Dygraph object's annotations aren't parsed. We parse them here and - // save a copy. If there is no parser, then the user must be using raw format. - this.annotations = []; - var parse = this.attr_('xValueParser') || function(x) { return x; }; - for (var i = 0; i < ann.length; i++) { - var a = {}; - if (!ann[i].xval && !ann[i].x) { - this.dygraph_.error("Annotations must have an 'x' property"); - return; - } - if (ann[i].icon && - !(ann[i].hasOwnProperty('width') && - ann[i].hasOwnProperty('height'))) { - this.dygraph_.error("Must set width and height when setting " + - "annotation.icon property"); - return; - } - Dygraph.update(a, ann[i]); - if (!a.xval) a.xval = parse(a.x); - this.annotations.push(a); - } -}; - -DygraphLayout.prototype.setXTicks = function(xTicks) { - this.xTicks_ = xTicks; -}; - -// TODO(danvk): add this to the Dygraph object's API or move it into Layout. -DygraphLayout.prototype.setYAxes = function (yAxes) { - this.yAxes_ = yAxes; -}; - -DygraphLayout.prototype.setDateWindow = function(dateWindow) { - this.dateWindow_ = dateWindow; -}; - -DygraphLayout.prototype.evaluate = function() { - this._evaluateLimits(); - this._evaluateLineCharts(); - this._evaluateLineTicks(); - this._evaluateAnnotations(); -}; - -DygraphLayout.prototype._evaluateLimits = function() { - this.minxval = this.maxxval = null; - if (this.dateWindow_) { - this.minxval = this.dateWindow_[0]; - this.maxxval = this.dateWindow_[1]; - } else { - for (var name in this.datasets) { - if (!this.datasets.hasOwnProperty(name)) continue; - var series = this.datasets[name]; - if (series.length > 1) { - var x1 = series[0][0]; - if (!this.minxval || x1 < this.minxval) this.minxval = x1; - - var x2 = series[series.length - 1][0]; - if (!this.maxxval || x2 > this.maxxval) this.maxxval = x2; - } - } - } - this.xrange = this.maxxval - this.minxval; - this.xscale = (this.xrange != 0 ? 1/this.xrange : 1.0); - - for (var i = 0; i < this.yAxes_.length; i++) { - var axis = this.yAxes_[i]; - axis.minyval = axis.computedValueRange[0]; - axis.maxyval = axis.computedValueRange[1]; - axis.yrange = axis.maxyval - axis.minyval; - axis.yscale = (axis.yrange != 0 ? 1.0 / axis.yrange : 1.0); - - if (axis.g.attr_("logscale")) { - axis.ylogrange = Dygraph.log10(axis.maxyval) - Dygraph.log10(axis.minyval); - axis.ylogscale = (axis.ylogrange != 0 ? 1.0 / axis.ylogrange : 1.0); - if (!isFinite(axis.ylogrange) || isNaN(axis.ylogrange)) { - axis.g.error('axis ' + i + ' of graph at ' + axis.g + - ' can\'t be displayed in log scale for range [' + - axis.minyval + ' - ' + axis.maxyval + ']'); - } - } - } -}; - -DygraphLayout.prototype._evaluateLineCharts = function() { - // add all the rects - this.points = new Array(); - for (var setName in this.datasets) { - if (!this.datasets.hasOwnProperty(setName)) continue; - - var dataset = this.datasets[setName]; - var axis = this.dygraph_.axisPropertiesForSeries(setName); - - for (var j = 0; j < dataset.length; j++) { - var item = dataset[j]; - - var yval; - if (axis.logscale) { - yval = 1.0 - ((Dygraph.log10(parseFloat(item[1])) - Dygraph.log10(axis.minyval)) * axis.ylogscale); // really should just be yscale. - } else { - yval = 1.0 - ((parseFloat(item[1]) - axis.minyval) * axis.yscale); - } - var point = { - // TODO(danvk): here - x: ((parseFloat(item[0]) - this.minxval) * this.xscale), - y: yval, - xval: parseFloat(item[0]), - yval: parseFloat(item[1]), - name: setName - }; - - this.points.push(point); - } - } -}; - -DygraphLayout.prototype._evaluateLineTicks = function() { - this.xticks = new Array(); - for (var i = 0; i < this.xTicks_.length; i++) { - var tick = this.xTicks_[i]; - var label = tick.label; - var pos = this.xscale * (tick.v - this.minxval); - if ((pos >= 0.0) && (pos <= 1.0)) { - this.xticks.push([pos, label]); - } - } - - this.yticks = new Array(); - for (var i = 0; i < this.yAxes_.length; i++ ) { - var axis = this.yAxes_[i]; - for (var j = 0; j < axis.ticks.length; j++) { - var tick = axis.ticks[j]; - var label = tick.label; - var pos = this.dygraph_.toPercentYCoord(tick.v, i); - if ((pos >= 0.0) && (pos <= 1.0)) { - this.yticks.push([i, pos, label]); - } - } - } -}; - - -/** - * Behaves the same way as PlotKit.Layout, but also copies the errors - * @private - */ -DygraphLayout.prototype.evaluateWithError = function() { - this.evaluate(); - if (!(this.attr_('errorBars') || this.attr_('customBars'))) return; - - // Copy over the error terms - var i = 0; // index in this.points - for (var setName in this.datasets) { - if (!this.datasets.hasOwnProperty(setName)) continue; - var j = 0; - var dataset = this.datasets[setName]; - for (var j = 0; j < dataset.length; j++, i++) { - var item = dataset[j]; - var xv = parseFloat(item[0]); - var yv = parseFloat(item[1]); - - if (xv == this.points[i].xval && - yv == this.points[i].yval) { - this.points[i].errorMinus = parseFloat(item[2]); - this.points[i].errorPlus = parseFloat(item[3]); - } - } - } -}; - -DygraphLayout.prototype._evaluateAnnotations = function() { - // Add the annotations to the point to which they belong. - // Make a map from (setName, xval) to annotation for quick lookups. - var annotations = {}; - for (var i = 0; i < this.annotations.length; i++) { - var a = this.annotations[i]; - annotations[a.xval + "," + a.series] = a; - } - - this.annotated_points = []; - for (var i = 0; i < this.points.length; i++) { - var p = this.points[i]; - var k = p.xval + "," + p.name; - if (k in annotations) { - p.annotation = annotations[k]; - this.annotated_points.push(p); - } - } -}; - -/** - * Convenience function to remove all the data sets from a graph - */ -DygraphLayout.prototype.removeAllDatasets = function() { - delete this.datasets; - this.datasets = new Array(); -}; - -/** - * Return a copy of the point at the indicated index, with its yval unstacked. - * @param int index of point in layout_.points - */ -DygraphLayout.prototype.unstackPointAtIndex = function(idx) { - var point = this.points[idx]; - - // Clone the point since we modify it - var unstackedPoint = {}; - for (var i in point) { - unstackedPoint[i] = point[i]; - } - - if (!this.attr_("stackedGraph")) { - return unstackedPoint; - } - - // The unstacked yval is equal to the current yval minus the yval of the - // next point at the same xval. - for (var i = idx+1; i < this.points.length; i++) { - if (this.points[i].xval == point.xval) { - unstackedPoint.yval -= this.points[i].yval; - break; - } - } - - return unstackedPoint; -} - -/** * The DygraphCanvasRenderer class does the actual rendering of the chart onto * a canvas. It's based on PlotKit.CanvasRenderer. * @param {Object} element The canvas to attach to * @param {Object} elementContext The 2d context of the canvas (injected so it * can be mocked for testing.) * @param {Layout} layout The DygraphLayout object for this graph. + * @constructor */ DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) { this.dygraph_ = dygraph; @@ -344,7 +78,11 @@ DygraphCanvasRenderer.prototype.computeArea_ = function() { area.w = this.width - area.x - this.attr_('rightGap'); area.h = this.height; if (this.attr_('drawXAxis')) { - area.h -= this.attr_('axisLabelFontSize') + 2 * this.attr_('axisTickSize'); + if (this.attr_('xAxisHeight')) { + area.h -= this.attr_('xAxisHeight'); + } else { + area.h -= this.attr_('axisLabelFontSize') + 2 * this.attr_('axisTickSize'); + } } // Shrink the drawing area to accomodate additional y-axes. @@ -519,16 +257,21 @@ DygraphCanvasRenderer.prototype._renderAxis = function() { zIndex: 10, color: this.attr_('axisLabelColor'), width: this.attr_('axisLabelWidth') + "px", + // height: this.attr_('axisLabelFontSize') + 2 + "px", overflow: "hidden" }; - var makeDiv = function(txt) { + var makeDiv = function(txt, axis) { var div = document.createElement("div"); for (var name in labelStyle) { if (labelStyle.hasOwnProperty(name)) { div.style[name] = labelStyle[name]; } } - div.appendChild(document.createTextNode(txt)); + var inner_div = document.createElement("div"); + // TODO(danvk): separate class for secondary y-axis + inner_div.className = 'dygraph-axis-label dygraph-axis-label-' + axis; + inner_div.appendChild(document.createTextNode(txt)); + div.appendChild(inner_div); return div; }; @@ -555,7 +298,7 @@ DygraphCanvasRenderer.prototype._renderAxis = function() { context.closePath(); context.stroke(); - var label = makeDiv(tick[2]); + var label = makeDiv(tick[2], 'y'); var top = (y - this.attr_('axisLabelFontSize') / 2); if (top < 0) top = 0; @@ -620,7 +363,7 @@ DygraphCanvasRenderer.prototype._renderAxis = function() { context.closePath(); context.stroke(); - var label = makeDiv(tick[1]); + var label = makeDiv(tick[1], 'x'); label.style.textAlign = "center"; label.style.top = (y + this.attr_('axisTickSize')) + 'px'; @@ -856,6 +599,8 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() { var fillGraph = this.attr_("fillGraph"); var stackedGraph = this.attr_("stackedGraph"); var stepPlot = this.attr_("stepPlot"); + var points = this.layout.points; + var pointsLength = points.length; var setNames = []; for (var name in this.layout.datasets) { @@ -873,8 +618,8 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() { // Update Points // TODO(danvk): here - for (var i = 0; i < this.layout.points.length; i++) { - var point = this.layout.points[i]; + for (var i = pointsLength; i--;) { + var point = points[i]; point.canvasx = this.area.w * point.x + this.area.x; point.canvasy = this.area.h * point.y + this.area.y; } @@ -903,8 +648,8 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() { fillAlpha + ')'; ctx.fillStyle = err_color; ctx.beginPath(); - for (var j = 0; j < this.layout.points.length; j++) { - var point = this.layout.points[j]; + for (var j = 0; j < pointsLength; j++) { + var point = points[j]; if (point.name == setName) { if (!Dygraph.isOK(point.y)) { prevX = NaN; @@ -967,8 +712,8 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() { fillAlpha + ')'; ctx.fillStyle = err_color; ctx.beginPath(); - for (var j = 0; j < this.layout.points.length; j++) { - var point = this.layout.points[j]; + for (var j = 0; j < pointsLength; j++) { + var point = points[j]; if (point.name == setName) { if (!Dygraph.isOK(point.y)) { prevX = NaN; @@ -1002,69 +747,77 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() { } } - for (var i = 0; i < setCount; i++) { + var isNullOrNaN = function(x) { + return (x === null || isNaN(x)); + }; + + // Drawing of a graph without error bars. + var firstIndexInSet = 0; + var afterLastIndexInSet = 0; + var setLength = 0; + for (var i = 0; i < setCount; i += 1) { + setLength = this.layout.setPointsLengths[i]; + afterLastIndexInSet += setLength; var setName = setNames[i]; var color = this.colors[setName]; var strokeWidth = this.dygraph_.attr_("strokeWidth", setName); // setup graphics context context.save(); - var point = this.layout.points[0]; var pointSize = this.dygraph_.attr_("pointSize", setName); var prevX = null, prevY = null; var drawPoints = this.dygraph_.attr_("drawPoints", setName); - var points = this.layout.points; - for (var j = 0; j < points.length; j++) { + for (var j = firstIndexInSet; j < afterLastIndexInSet; j++) { var point = points[j]; - if (point.name == setName) { - if (!Dygraph.isOK(point.canvasy)) { - if (stepPlot && prevX != null) { - // Draw a horizontal line to the start of the missing data + if (isNullOrNaN(point.canvasy)) { + if (stepPlot && prevX != null) { + // Draw a horizontal line to the start of the missing data + ctx.beginPath(); + ctx.strokeStyle = color; + ctx.lineWidth = this.attr_('strokeWidth'); + ctx.moveTo(prevX, prevY); + ctx.lineTo(point.canvasx, prevY); + ctx.stroke(); + } + // this will make us move to the next point, not draw a line to it. + prevX = prevY = null; + } else { + // A point is "isolated" if it is non-null but both the previous + // and next points are null. + var isIsolated = (!prevX && (j == points.length - 1 || + isNullOrNaN(points[j+1].canvasy))); + if (prevX === null) { + prevX = point.canvasx; + prevY = point.canvasy; + } else { + // TODO(antrob): skip over points that lie on a line that is already + // going to be drawn. There is no need to have more than 2 + // consecutive points that are collinear. + if (strokeWidth) { ctx.beginPath(); ctx.strokeStyle = color; - ctx.lineWidth = this.attr_('strokeWidth'); + ctx.lineWidth = strokeWidth; ctx.moveTo(prevX, prevY); - ctx.lineTo(point.canvasx, prevY); - ctx.stroke(); - } - // this will make us move to the next point, not draw a line to it. - prevX = prevY = null; - } else { - // A point is "isolated" if it is non-null but both the previous - // and next points are null. - var isIsolated = (!prevX && (j == points.length - 1 || - !Dygraph.isOK(points[j+1].canvasy))); - - if (!prevX) { + if (stepPlot) { + ctx.lineTo(point.canvasx, prevY); + } prevX = point.canvasx; prevY = point.canvasy; - } else { - // TODO(danvk): figure out why this conditional is necessary. - if (strokeWidth) { - ctx.beginPath(); - ctx.strokeStyle = color; - ctx.lineWidth = strokeWidth; - ctx.moveTo(prevX, prevY); - if (stepPlot) { - ctx.lineTo(point.canvasx, prevY); - } - prevX = point.canvasx; - prevY = point.canvasy; - ctx.lineTo(prevX, prevY); - ctx.stroke(); - } + ctx.lineTo(prevX, prevY); + ctx.stroke(); } + } - if (drawPoints || isIsolated) { - ctx.beginPath(); - ctx.fillStyle = color; - ctx.arc(point.canvasx, point.canvasy, pointSize, - 0, 2 * Math.PI, false); - ctx.fill(); - } + if (drawPoints || isIsolated) { + ctx.beginPath(); + ctx.fillStyle = color; + ctx.arc(point.canvasx, point.canvasy, pointSize, + 0, 2 * Math.PI, false); + ctx.fill(); } } } + firstIndexInSet = afterLastIndexInSet; } context.restore();