X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-canvas.js;h=d5c812e196398374fc196b2e1aa0323b9a860784;hb=5d13ef68a27544eff72ea3a2ef3aabdc4c4fd740;hp=beef2c03b39c2270335c0eba3a399801f4d2f09b;hpb=b8bd9b3583e5f29db2f1375e8dae4c6d65c7d1ab;p=dygraphs.git

diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index beef2c0..d5c812e 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -2,24 +2,22 @@
 // All Rights Reserved.
 
 /**
- * @fileoverview Subclasses various parts of PlotKit to meet the additional
- * needs of Dygraph: grid overlays and error bars
+ * @fileoverview Based on PlotKit, but modified to meet the needs of dygraphs.
+ * In particular, support for:
+ * - grid overlays 
+ * - error bars
+ * - dygraphs attribute system
  */
 
-// Subclass PlotKit.Layout to add:
-// 1. Sigma/errorBars properties
-// 2. Copy error terms for PlotKit.CanvasRenderer._renderLineChart
-
 /**
- * Creates a new DygraphLayout object. Options are the same as those allowed
- * by the PlotKit.Layout constructor.
+ * Creates a new DygraphLayout object.
  * @param {Object} options Options for PlotKit.Layout
  * @return {Object} The DygraphLayout object
  */
 DygraphLayout = function(dygraph, options) {
   this.dygraph_ = dygraph;
   this.options = {};  // TODO(danvk): remove, use attr_ instead.
-  MochiKit.Base.update(this.options, options ? options : {});
+  Dygraph.update(this.options, options ? options : {});
   this.datasets = new Array();
 };
 
@@ -39,13 +37,19 @@ DygraphLayout.prototype.evaluate = function() {
 
 DygraphLayout.prototype._evaluateLimits = function() {
   this.minxval = this.maxxval = null;
-  for (var name in this.datasets) {
-    var series = this.datasets[name];
-    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;
+  if (this.options.dateWindow) {
+    this.minxval = this.options.dateWindow[0];
+    this.maxxval = this.options.dateWindow[1];
+  } else {
+    for (var name in this.datasets) {
+      if (!this.datasets.hasOwnProperty(name)) continue;
+      var series = this.datasets[name];
+      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);
@@ -60,10 +64,13 @@ 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];
     for (var j = 0; j < dataset.length; j++) {
       var item = dataset[j];
       var point = {
+        // TODO(danvk): here
         x: ((parseFloat(item[0]) - this.minxval) * this.xscale),
         y: 1.0 - ((parseFloat(item[1]) - this.minyval) * this.yscale),
         xval: parseFloat(item[0]),
@@ -78,9 +85,7 @@ DygraphLayout.prototype._evaluateLineCharts = function() {
       if (point.y >= 1.0) {
         point.y = 1.0;
       }
-      if ((point.x >= 0.0) && (point.x <= 1.0)) {
-        this.points.push(point);
-      }
+      this.points.push(point);
     }
   }
 };
@@ -119,9 +124,9 @@ DygraphLayout.prototype.evaluateWithError = function() {
   // 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];
-    if (PlotKit.Base.isFuncLike(dataset)) continue;
     for (var j = 0; j < dataset.length; j++, i++) {
       var item = dataset[j];
       var xv = parseFloat(item[0]);
@@ -149,7 +154,7 @@ DygraphLayout.prototype.removeAllDatasets = function() {
  * @param {Object} new_options an associative array of new properties
  */
 DygraphLayout.prototype.updateOptions = function(new_options) {
-  MochiKit.Base.update(this.options, new_options ? new_options : {});
+  Dygraph.update(this.options, new_options ? new_options : {});
 };
 
 // Subclass PlotKit.CanvasRenderer to add:
@@ -164,17 +169,107 @@ DygraphLayout.prototype.updateOptions = function(new_options) {
  */
 DygraphCanvasRenderer = function(dygraph, element, layout, options) {
   // TODO(danvk): remove options, just use dygraph.attr_.
-  PlotKit.CanvasRenderer.call(this, element, layout, options);
   this.dygraph_ = dygraph;
-  this.options.drawYGrid = true;
-  this.options.drawXGrid = true;
-  this.options.gridLineColor = MochiKit.Color.Color.grayColor();
-  MochiKit.Base.update(this.options, options);
 
-  // TODO(danvk) This shouldn't be necessary: effects should be overlaid
-  this.options.drawBackground = false;
+  // default options
+  this.options = {
+    "strokeWidth": 0.5,
+    "drawXAxis": true,
+    "drawYAxis": true,
+    "axisLineColor": "black",
+    "axisLineWidth": 0.5,
+    "axisTickSize": 3,
+    "axisLabelColor": "black",
+    "axisLabelFont": "Arial",
+    "axisLabelFontSize": 9,
+    "axisLabelWidth": 50,
+    "drawYGrid": true,
+    "drawXGrid": true,
+    "gridLineColor": "rgb(128,128,128)",
+    "fillAlpha": 0.15,
+    "underlayCallback": null
+  };
+  Dygraph.update(this.options, options);
+
+  this.layout = layout;
+  this.element = element;
+  this.container = this.element.parentNode;
+
+  this.height = this.element.height;
+  this.width = this.element.width;
+
+  // --- check whether everything is ok before we return
+  if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element)))
+      throw "Canvas is not supported.";
+
+  // internal state
+  this.xlabels = new Array();
+  this.ylabels = new Array();
+
+  this.area = {
+    x: this.options.yAxisLabelWidth + 2 * this.options.axisTickSize,
+    y: 0
+  };
+  this.area.w = this.width - this.area.x - this.options.rightGap;
+  this.area.h = this.height - this.options.axisLabelFontSize -
+                2 * this.options.axisTickSize;
+
+  this.container.style.position = "relative";
+  this.container.style.width = this.width + "px";
+};
+
+DygraphCanvasRenderer.prototype.clear = function() {
+  if (this.isIE) {
+    // VML takes a while to start up, so we just poll every this.IEDelay
+    try {
+      if (this.clearDelay) {
+        this.clearDelay.cancel();
+        this.clearDelay = null;
+      }
+      var context = this.element.getContext("2d");
+    }
+    catch (e) {
+      // TODO(danvk): this is broken, since MochiKit.Async is gone.
+      this.clearDelay = MochiKit.Async.wait(this.IEDelay);
+      this.clearDelay.addCallback(bind(this.clear, this));
+      return;
+    }
+  }
+
+  var context = this.element.getContext("2d");
+  context.clearRect(0, 0, this.width, this.height);
+
+  for (var i = 0; i < this.xlabels.length; i++) {
+    var el = this.xlabels[i];
+    el.parentNode.removeChild(el);
+  }
+  for (var i = 0; i < this.ylabels.length; i++) {
+    var el = this.ylabels[i];
+    el.parentNode.removeChild(el);
+  }
+  this.xlabels = new Array();
+  this.ylabels = new Array();
+};
+
+
+DygraphCanvasRenderer.isSupported = function(canvasName) {
+  var canvas = null;
+  try {
+    if (typeof(canvasName) == 'undefined' || canvasName == null)
+      canvas = document.createElement("canvas");
+    else
+      canvas = canvasName;
+    var context = 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;
 };
-DygraphCanvasRenderer.prototype = new PlotKit.CanvasRenderer();
 
 /**
  * Draw an X/Y grid on top of the existing plot
@@ -182,10 +277,15 @@ DygraphCanvasRenderer.prototype = new PlotKit.CanvasRenderer();
 DygraphCanvasRenderer.prototype.render = function() {
   // Draw the new X/Y grid
   var ctx = this.element.getContext("2d");
+
+  if (this.options.underlayCallback) {
+    this.options.underlayCallback(ctx, this.area, this.layout, this.dygraph_);
+  }
+
   if (this.options.drawYGrid) {
     var ticks = this.layout.yticks;
     ctx.save();
-    ctx.strokeStyle = this.options.gridLineColor.toRGBString();
+    ctx.strokeStyle = this.options.gridLineColor;
     ctx.lineWidth = this.options.axisLineWidth;
     for (var i = 0; i < ticks.length; i++) {
       var x = this.area.x;
@@ -201,7 +301,7 @@ DygraphCanvasRenderer.prototype.render = function() {
   if (this.options.drawXGrid) {
     var ticks = this.layout.xticks;
     ctx.save();
-    ctx.strokeStyle = this.options.gridLineColor.toRGBString();
+    ctx.strokeStyle = this.options.gridLineColor;
     ctx.lineWidth = this.options.axisLineWidth;
     for (var i=0; i<ticks.length; i++) {
       var x = this.area.x + ticks[i][0] * this.area.w;
@@ -215,11 +315,135 @@ DygraphCanvasRenderer.prototype.render = function() {
   }
 
   // Do the ordinary rendering, as before
-  // TODO(danvk) Call super.render()
   this._renderLineChart();
-  this._renderLineAxis();
+  this._renderAxis();
 };
 
+
+DygraphCanvasRenderer.prototype._renderAxis = function() {
+  if (!this.options.drawXAxis && !this.options.drawYAxis)
+    return;
+
+  var context = this.element.getContext("2d");
+
+  var labelStyle = {
+    "position": "absolute",
+    "fontSize": this.options.axisLabelFontSize + "px",
+    "zIndex": 10,
+    "color": this.options.axisLabelColor,
+    "width": this.options.axisLabelWidth + "px",
+    "overflow": "hidden"
+  };
+  var makeDiv = function(txt) {
+    var div = document.createElement("div");
+    for (var name in labelStyle) {
+      if (labelStyle.hasOwnProperty(name)) {
+        div.style[name] = labelStyle[name];
+      }
+    }
+    div.appendChild(document.createTextNode(txt));
+    return div;
+  };
+
+  // axis lines
+  context.save();
+  context.strokeStyle = this.options.axisLineColor;
+  context.lineWidth = this.options.axisLineWidth;
+
+  if (this.options.drawYAxis) {
+    if (this.layout.yticks && this.layout.yticks.length > 0) {
+      for (var i = 0; i < this.layout.yticks.length; i++) {
+        var tick = this.layout.yticks[i];
+        if (typeof(tick) == "function") return;
+        var x = this.area.x;
+        var y = this.area.y + tick[0] * this.area.h;
+        context.beginPath();
+        context.moveTo(x, y);
+        context.lineTo(x - this.options.axisTickSize, y);
+        context.closePath();
+        context.stroke();
+
+        var label = makeDiv(tick[1]);
+        var top = (y - this.options.axisLabelFontSize / 2);
+        if (top < 0) top = 0;
+
+        if (top + this.options.axisLabelFontSize + 3 > this.height) {
+          label.style.bottom = "0px";
+        } else {
+          label.style.top = top + "px";
+        }
+        label.style.left = "0px";
+        label.style.textAlign = "right";
+        label.style.width = this.options.yAxisLabelWidth + "px";
+        this.container.appendChild(label);
+        this.ylabels.push(label);
+      }
+
+      // The lowest tick on the y-axis often overlaps with the leftmost
+      // tick on the x-axis. Shift the bottom tick up a little bit to
+      // compensate if necessary.
+      var bottomTick = this.ylabels[0];
+      var fontSize = this.options.axisLabelFontSize;
+      var bottom = parseInt(bottomTick.style.top) + fontSize;
+      if (bottom > this.height - fontSize) {
+        bottomTick.style.top = (parseInt(bottomTick.style.top) -
+            fontSize / 2) + "px";
+      }
+    }
+
+    context.beginPath();
+    context.moveTo(this.area.x, this.area.y);
+    context.lineTo(this.area.x, this.area.y + this.area.h);
+    context.closePath();
+    context.stroke();
+  }
+
+  if (this.options.drawXAxis) {
+    if (this.layout.xticks) {
+      for (var i = 0; i < this.layout.xticks.length; i++) {
+        var tick = this.layout.xticks[i];
+        if (typeof(dataset) == "function") return;
+
+        var x = this.area.x + tick[0] * this.area.w;
+        var y = this.area.y + this.area.h;
+        context.beginPath();
+        context.moveTo(x, y);
+        context.lineTo(x, y + this.options.axisTickSize);
+        context.closePath();
+        context.stroke();
+
+        var label = makeDiv(tick[1]);
+        label.style.textAlign = "center";
+        label.style.bottom = "0px";
+
+        var left = (x - this.options.axisLabelWidth/2);
+        if (left + this.options.axisLabelWidth > this.width) {
+          left = this.width - this.options.xAxisLabelWidth;
+          label.style.textAlign = "right";
+        }
+        if (left < 0) {
+          left = 0;
+          label.style.textAlign = "left";
+        }
+
+        label.style.left = left + "px";
+        label.style.width = this.options.xAxisLabelWidth + "px";
+        this.container.appendChild(label);
+        this.xlabels.push(label);
+      }
+    }
+
+    context.beginPath();
+    context.moveTo(this.area.x, this.area.y + this.area.h);
+    context.lineTo(this.area.x + this.area.w, this.area.y + this.area.h);
+    context.closePath();
+    context.stroke();
+  }
+
+  context.restore();
+};
+
+
 /**
  * Overrides the CanvasRenderer method to draw error bars
  */
@@ -227,120 +451,216 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
   var context = this.element.getContext("2d");
   var colorCount = this.options.colorScheme.length;
   var colorScheme = this.options.colorScheme;
-  var setNames = MochiKit.Base.keys(this.layout.datasets);
+  var fillAlpha = this.options.fillAlpha;
   var errorBars = this.layout.options.errorBars;
+  var fillGraph = this.layout.options.fillGraph;
+  var stackedGraph = this.layout.options.stackedGraph;
+  var stepPlot = this.layout.options.stepPlot;
+
+  var setNames = [];
+  for (var name in this.layout.datasets) {
+    if (this.layout.datasets.hasOwnProperty(name)) {
+      setNames.push(name);
+    }
+  }
   var setCount = setNames.length;
-  var bind = MochiKit.Base.bind;
-  var partial = MochiKit.Base.partial;
 
-  //Update Points
-  var updatePoint = function(point) {
+  this.colors = {}
+  for (var i = 0; i < setCount; i++) {
+    this.colors[setNames[i]] = colorScheme[i % colorCount];
+  }
+
+  // Update Points
+  // TODO(danvk): here
+  for (var i = 0; i < this.layout.points.length; i++) {
+    var point = this.layout.points[i];
     point.canvasx = this.area.w * point.x + this.area.x;
     point.canvasy = this.area.h * point.y + this.area.y;
   }
-  MochiKit.Iter.forEach(this.layout.points, updatePoint, this);
 
   // create paths
   var isOK = function(x) { return x && !isNaN(x); };
-  var makePath = function(ctx) {
+
+  var ctx = context;
+  if (errorBars) {
+    if (fillGraph) {
+      this.dygraph_.warn("Can't use fillGraph option with error bars");
+    }
+
     for (var i = 0; i < setCount; i++) {
       var setName = setNames[i];
-      var color = colorScheme[i%colorCount];
-      var strokeX = this.options.strokeColorTransform;
+      var color = this.colors[setName];
 
       // setup graphics context
-      context.save();
-      context.strokeStyle = color.toRGBString();
-      context.lineWidth = this.options.strokeWidth;
-      var point = this.layout.points[0];
-      var pointSize = this.dygraph_.attr_("pointSize");
-      var prevX = null, prevY = null;
-      var drawPoints = this.dygraph_.attr_("drawPoints");
-      var points = this.layout.points;
-      for (var j = 0; j < points.length; j++) {
-        var point = points[j];
+      ctx.save();
+      var prevX = NaN;
+      var prevY = NaN;
+      var prevYs = [-1, -1];
+      var yscale = this.layout.yscale;
+      // should be same color as the lines but only 15% opaque.
+      var rgb = new RGBColor(color);
+      var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' +
+                            fillAlpha + ')';
+      ctx.fillStyle = err_color;
+      ctx.beginPath();
+      for (var j = 0; j < this.layout.points.length; j++) {
+        var point = this.layout.points[j];
         if (point.name == setName) {
-          if (!isOK(point.canvasy)) {
-            // this will make us move to the next point, not draw a line to it.
-            prevX = prevY = null;
+          if (!isOK(point.y)) {
+            prevX = NaN;
+            continue;
+          }
+          // TODO(danvk): here
+          if (stepPlot) {
+            var newYs = [ prevY - point.errorPlus * yscale,
+                          prevY + point.errorMinus * yscale ];
+            prevY = point.y;
           } 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 ||
-                                         !isOK(points[j+1].canvasy)));
-
-            if (!prevX) {
-              prevX = point.canvasx;
-              prevY = point.canvasy;
+            var newYs = [ point.y - point.errorPlus * yscale,
+                          point.y + point.errorMinus * yscale ];
+          }
+          newYs[0] = this.area.h * newYs[0] + this.area.y;
+          newYs[1] = this.area.h * newYs[1] + this.area.y;
+          if (!isNaN(prevX)) {
+            if (stepPlot) {
+              ctx.moveTo(prevX, newYs[0]);
             } else {
-              ctx.beginPath();
-              ctx.moveTo(prevX, prevY);
-              prevX = point.canvasx;
-              prevY = point.canvasy;
-              ctx.lineTo(prevX, prevY);
-              ctx.stroke();
+              ctx.moveTo(prevX, prevYs[0]);
             }
-
-            if (drawPoints || isIsolated) {
-             ctx.beginPath();
-             ctx.fillStyle = color.toRGBString();
-             ctx.arc(point.canvasx, point.canvasy, pointSize, 0, 360, false);
-             ctx.fill();
+            ctx.lineTo(point.canvasx, newYs[0]);
+            ctx.lineTo(point.canvasx, newYs[1]);
+            if (stepPlot) {
+              ctx.lineTo(prevX, newYs[1]);
+            } else {
+              ctx.lineTo(prevX, prevYs[1]);
             }
+            ctx.closePath();
           }
+          prevYs = newYs;
+          prevX = point.canvasx;
         }
       }
+      ctx.fill();
     }
-  };
+  } else if (fillGraph) {
+    var axisY = 1.0 + this.layout.minyval * this.layout.yscale;
+    if (axisY < 0.0) axisY = 0.0;
+    else if (axisY > 1.0) axisY = 1.0;
+    axisY = this.area.h * axisY + this.area.y;
 
-  var makeErrorBars = function(ctx) {
-    for (var i = 0; i < setCount; i++) {
+    var baseline = []  // for stacked graphs: baseline for filling
+
+    // process sets in reverse order (needed for stacked graphs)
+    for (var i = setCount - 1; i >= 0; i--) {
       var setName = setNames[i];
-      var color = colorScheme[i % colorCount];
-      var strokeX = this.options.strokeColorTransform;
+      var color = this.colors[setName];
 
       // setup graphics context
-      context.save();
-      context.strokeStyle = color.toRGBString();
-      context.lineWidth = this.options.strokeWidth;
-      var prevX = -1;
+      ctx.save();
+      var prevX = NaN;
       var prevYs = [-1, -1];
-      var count = 0;
       var yscale = this.layout.yscale;
-      var errorTrapezoid = function(ctx_,point) {
-        count++;
+      // should be same color as the lines but only 15% opaque.
+      var rgb = new RGBColor(color);
+      var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' +
+                            fillAlpha + ')';
+      ctx.fillStyle = err_color;
+      ctx.beginPath();
+      for (var j = 0; j < this.layout.points.length; j++) {
+        var point = this.layout.points[j];
         if (point.name == setName) {
-          if (!point.y || isNaN(point.y)) {
-            prevX = -1;
-            return;
+          if (!isOK(point.y)) {
+            prevX = NaN;
+            continue;
           }
-          var newYs = [ point.y - point.errorPlus * yscale,
-                        point.y + point.errorMinus * yscale ];
-          newYs[0] = this.area.h * newYs[0] + this.area.y;
-          newYs[1] = this.area.h * newYs[1] + this.area.y;
-          if (prevX >= 0) {
-            ctx_.moveTo(prevX, prevYs[0]);
-            ctx_.lineTo(point.canvasx, newYs[0]);
-            ctx_.lineTo(point.canvasx, newYs[1]);
-            ctx_.lineTo(prevX, prevYs[1]);
-            ctx_.closePath();
+          var newYs;
+          if (stackedGraph) {
+            lastY = baseline[point.canvasx];
+            if (lastY === undefined) lastY = axisY;
+            baseline[point.canvasx] = point.canvasy;
+            newYs = [ point.canvasy, lastY ];
+          } else {
+            newYs = [ point.canvasy, axisY ];
           }
-          prevYs[0] = newYs[0];
-          prevYs[1] = newYs[1];
+          if (!isNaN(prevX)) {
+            ctx.moveTo(prevX, prevYs[0]);
+            if (stepPlot) {
+              ctx.lineTo(point.canvasx, prevYs[0]);
+            } else {
+              ctx.lineTo(point.canvasx, newYs[0]);
+            }
+            ctx.lineTo(point.canvasx, newYs[1]);
+            ctx.lineTo(prevX, prevYs[1]);
+            ctx.closePath();
+          }
+          prevYs = newYs;
           prevX = point.canvasx;
         }
-      };
-      // should be same color as the lines
-      var err_color = color.colorWithAlpha(0.15);
-      ctx.fillStyle = err_color.toRGBString();
-      ctx.beginPath();
-      MochiKit.Iter.forEach(this.layout.points, partial(errorTrapezoid, ctx), this);
+      }
       ctx.fill();
     }
-  };
+  }
+
+  for (var i = 0; i < setCount; i++) {
+    var setName = setNames[i];
+    var color = this.colors[setName];
+
+    // setup graphics context
+    context.save();
+    var point = this.layout.points[0];
+    var pointSize = this.dygraph_.attr_("pointSize");
+    var prevX = null, prevY = null;
+    var drawPoints = this.dygraph_.attr_("drawPoints");
+    var points = this.layout.points;
+    for (var j = 0; j < points.length; j++) {
+      var point = points[j];
+      if (point.name == setName) {
+        if (!isOK(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.options.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 ||
+                                       !isOK(points[j+1].canvasy)));
+
+          if (!prevX) {
+            prevX = point.canvasx;
+            prevY = point.canvasy;
+          } else {
+            ctx.beginPath();
+            ctx.strokeStyle = color;
+            ctx.lineWidth = this.options.strokeWidth;
+            ctx.moveTo(prevX, prevY);
+            if (stepPlot) {
+              ctx.lineTo(point.canvasx, prevY);
+            }
+            prevX = point.canvasx;
+            prevY = point.canvasy;
+            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 (errorBars)
-    bind(makeErrorBars, this)(context);
-  bind(makePath, this)(context);
   context.restore();
 };