X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-canvas.js;h=5326673b1d466594a7e7bd35b4de2e8edb22e642;hb=beeabac2f71ae45c510b0355d0e76972083a6ca6;hp=0c44e8479ef4ba71ba5a3b535111725d2c9257d2;hpb=cbfcf21db4a2ef0f5db409591146f975ffe7b7f2;p=dygraphs.git

diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index 0c44e84..5326673 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -29,6 +29,23 @@
 "use strict";
 
 
+/**
+ * @constructor
+ *
+ * This gets called when there are "new points" to chart. This is generally the
+ * case when the underlying data being charted has changed. It is _not_ called
+ * in the common case that the user has zoomed or is panning the view.
+ *
+ * The chart canvas has already been created by the Dygraph object. The
+ * renderer simply gets a drawing context.
+ *
+ * @param {Dyraph} dygraph The chart to which this renderer belongs.
+ * @param {Canvas} element The <canvas> DOM element on which to draw.
+ * @param {CanvasRenderingContext2D} elementContext The drawing context.
+ * @param {DygraphLayout} layout The chart's DygraphLayout object.
+ *
+ * TODO(danvk): remove the elementContext property.
+ */
 var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) {
   this.dygraph_ = dygraph;
 
@@ -45,11 +62,6 @@ var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) {
       throw "Canvas is not supported.";
 
   // internal state
-  this.xlabels = [];
-  this.ylabels = [];
-  this.annotations = [];
-  this.chartLabels = {};
-
   this.area = layout.getPlotArea();
   this.container.style.position = "relative";
   this.container.style.width = this.width + "px";
@@ -79,6 +91,12 @@ DygraphCanvasRenderer.prototype.attr_ = function(x) {
   return this.dygraph_.attr_(x);
 };
 
+/**
+ * Clears out all chart content and DOM elements.
+ * This is called immediately before render() on every frame, including
+ * during zooms and pans.
+ * @private
+ */
 DygraphCanvasRenderer.prototype.clear = function() {
   var context;
   if (this.isIE) {
@@ -100,30 +118,12 @@ DygraphCanvasRenderer.prototype.clear = function() {
 
   context = this.elementContext;
   context.clearRect(0, 0, this.width, this.height);
-
-  function removeArray(ary) {
-    for (var i = 0; i < ary.length; i++) {
-      var el = ary[i];
-      if (el.parentNode) el.parentNode.removeChild(el);
-    }
-  }
-
-  removeArray(this.xlabels);
-  removeArray(this.ylabels);
-  removeArray(this.annotations);
-
-  for (var k in this.chartLabels) {
-    if (!this.chartLabels.hasOwnProperty(k)) continue;
-    var el = this.chartLabels[k];
-    if (el.parentNode) el.parentNode.removeChild(el);
-  }
-  this.xlabels = [];
-  this.ylabels = [];
-  this.annotations = [];
-  this.chartLabels = {};
 };
 
-
+/**
+ * Checks whether the browser supports the &lt;canvas&gt; tag.
+ * @private
+ */
 DygraphCanvasRenderer.isSupported = function(canvasName) {
   var canvas = null;
   try {
@@ -153,7 +153,11 @@ DygraphCanvasRenderer.prototype.setColors = function(colors) {
 };
 
 /**
- * Draw an X/Y grid on top of the existing plot
+ * This method is responsible for drawing everything on the chart, including
+ * lines, error bars, fills and axes.
+ * It is called immediately after clear() on every frame, including during pans
+ * and zooms.
+ * @private
  */
 DygraphCanvasRenderer.prototype.render = function() {
   // Draw the new X/Y grid. Lines appear crisper when pixels are rounded to
@@ -208,9 +212,6 @@ DygraphCanvasRenderer.prototype.render = function() {
 
   // Do the ordinary rendering, as before
   this._renderLineChart();
-  this._renderAxis();
-  this._renderChartLabels();
-  this._renderAnnotations();
 };
 
 DygraphCanvasRenderer.prototype._createIEClipArea = function() {
@@ -282,492 +283,169 @@ DygraphCanvasRenderer.prototype._createIEClipArea = function() {
   });
 };
 
-DygraphCanvasRenderer.prototype._renderAxis = function() {
-  if (!this.attr_('drawXAxis') && !this.attr_('drawYAxis')) return;
-
-  // Round pixels to half-integer boundaries for crisper drawing.
-  function halfUp(x)  { return Math.round(x) + 0.5; }
-  function halfDown(y){ return Math.round(y) - 0.5; }
-
-  var context = this.elementContext;
-
-  var label, x, y, tick, i;
 
-  var labelStyle = {
-    position: "absolute",
-    fontSize: this.attr_('axisLabelFontSize') + "px",
-    zIndex: 10,
-    color: this.attr_('axisLabelColor'),
-    width: this.attr_('axisLabelWidth') + "px",
-    // height: this.attr_('axisLabelFontSize') + 2 + "px",
-    lineHeight: "normal",  // Something other than "normal" line-height screws up label positioning.
-    overflow: "hidden"
-  };
-  var makeDiv = function(txt, axis, prec_axis) {
-    var div = document.createElement("div");
-    for (var name in labelStyle) {
-      if (labelStyle.hasOwnProperty(name)) {
-        div.style[name] = labelStyle[name];
-      }
-    }
-    var inner_div = document.createElement("div");
-    inner_div.className = 'dygraph-axis-label' +
-                          ' dygraph-axis-label-' + axis +
-                          (prec_axis ? ' dygraph-axis-label-' + prec_axis : '');
-    inner_div.innerHTML=txt;
-    div.appendChild(inner_div);
-    return div;
-  };
-
-  // axis lines
-  context.save();
-  context.strokeStyle = this.attr_('axisLineColor');
-  context.lineWidth = this.attr_('axisLineWidth');
-
-  if (this.attr_('drawYAxis')) {
-    if (this.layout.yticks && this.layout.yticks.length > 0) {
-      var num_axes = this.dygraph_.numAxes();
-      for (i = 0; i < this.layout.yticks.length; i++) {
-        tick = this.layout.yticks[i];
-        if (typeof(tick) == "function") return;
-        x = this.area.x;
-        var sgn = 1;
-        var prec_axis = 'y1';
-        if (tick[0] == 1) {  // right-side y-axis
-          x = this.area.x + this.area.w;
-          sgn = -1;
-          prec_axis = 'y2';
-        }
-        y = this.area.y + tick[1] * this.area.h;
-
-        /* Tick marks are currently clipped, so don't bother drawing them.
-        context.beginPath();
-        context.moveTo(halfUp(x), halfDown(y));
-        context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y));
-        context.closePath();
-        context.stroke();
-        */
-
-        label = makeDiv(tick[2], 'y', num_axes == 2 ? prec_axis : null);
-        var top = (y - this.attr_('axisLabelFontSize') / 2);
-        if (top < 0) top = 0;
-
-        if (top + this.attr_('axisLabelFontSize') + 3 > this.height) {
-          label.style.bottom = "0px";
-        } else {
-          label.style.top = top + "px";
-        }
-        if (tick[0] === 0) {
-          label.style.left = (this.area.x - this.attr_('yAxisLabelWidth') - this.attr_('axisTickSize')) + "px";
-          label.style.textAlign = "right";
-        } else if (tick[0] == 1) {
-          label.style.left = (this.area.x + this.area.w +
-                              this.attr_('axisTickSize')) + "px";
-          label.style.textAlign = "left";
-        }
-        label.style.width = this.attr_('yAxisLabelWidth') + "px";
-        this.container.appendChild(label);
-        this.ylabels.push(label);
-      }
+/**
+ * Returns a predicate to be used with an iterator, which will
+ * iterate over points appropriately, depending on whether
+ * connectSeparatedPoints is true. When it's false, the predicate will
+ * skip over points with missing yVals.
+ */
+DygraphCanvasRenderer._getIteratorPredicate = function(connectSeparatedPoints) {
+  return connectSeparatedPoints ? DygraphCanvasRenderer._predicateThatSkipsEmptyPoints : null;
+}
 
-      // 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.attr_('axisLabelFontSize');
-      var bottom = parseInt(bottomTick.style.top, 10) + fontSize;
-      if (bottom > this.height - fontSize) {
-        bottomTick.style.top = (parseInt(bottomTick.style.top, 10) -
-            fontSize / 2) + "px";
-      }
-    }
+DygraphCanvasRenderer._predicateThatSkipsEmptyPoints =
+  function(array, idx) { return array[idx].yval !== null; }
 
-    // draw a vertical line on the left to separate the chart from the labels.
-    context.beginPath();
-    context.moveTo(halfUp(this.area.x), halfDown(this.area.y));
-    context.lineTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h));
-    context.closePath();
-    context.stroke();
-
-    // if there's a secondary y-axis, draw a vertical line for that, too.
-    if (this.dygraph_.numAxes() == 2) {
-      context.beginPath();
-      context.moveTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y));
-      context.lineTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y + this.area.h));
-      context.closePath();
-      context.stroke();
-    }
+DygraphCanvasRenderer.prototype._drawStyledLine = function(
+    ctx, i, setName, color, strokeWidth, strokePattern, drawPoints,
+    drawPointCallback, pointSize) {
+  // TODO(konigsberg): Compute attributes outside this method call.
+  var stepPlot = this.attr_("stepPlot");
+  var firstIndexInSet = this.layout.setPointsOffsets[i];
+  var setLength = this.layout.setPointsLengths[i];
+  var points = this.layout.points;
+  if (!Dygraph.isArrayLike(strokePattern)) {
+    strokePattern = null;
   }
+  var drawGapPoints = this.dygraph_.attr_('drawGapEdgePoints', setName);
 
-  if (this.attr_('drawXAxis')) {
-    if (this.layout.xticks) {
-      for (i = 0; i < this.layout.xticks.length; i++) {
-        tick = this.layout.xticks[i];
-        x = this.area.x + tick[0] * this.area.w;
-        y = this.area.y + this.area.h;
-
-        /* Tick marks are currently clipped, so don't bother drawing them.
-        context.beginPath();
-        context.moveTo(halfUp(x), halfDown(y));
-        context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize')));
-        context.closePath();
-        context.stroke();
-        */
-
-        label = makeDiv(tick[1], 'x');
-        label.style.textAlign = "center";
-        label.style.top = (y + this.attr_('axisTickSize')) + 'px';
-
-        var left = (x - this.attr_('axisLabelWidth')/2);
-        if (left + this.attr_('axisLabelWidth') > this.width) {
-          left = this.width - this.attr_('xAxisLabelWidth');
-          label.style.textAlign = "right";
-        }
-        if (left < 0) {
-          left = 0;
-          label.style.textAlign = "left";
-        }
+  ctx.save();
 
-        label.style.left = left + "px";
-        label.style.width = this.attr_('xAxisLabelWidth') + "px";
-        this.container.appendChild(label);
-        this.xlabels.push(label);
-      }
-    }
+  var iter = Dygraph.createIterator(points, firstIndexInSet, setLength,
+      DygraphCanvasRenderer._getIteratorPredicate(this.attr_("connectSeparatedPoints")));
 
-    context.beginPath();
-    context.moveTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h));
-    context.lineTo(halfUp(this.area.x + this.area.w), halfDown(this.area.y + this.area.h));
-    context.closePath();
-    context.stroke();
+  var pointsOnLine;
+  var strategy;
+  if (!strokePattern || strokePattern.length <= 1) {
+    strategy = trivialStrategy(ctx, color, strokeWidth);
+  } else {
+    strategy = nonTrivialStrategy(this, ctx, color, strokeWidth, strokePattern);
   }
+  pointsOnLine = this._drawSeries(ctx, iter, strokeWidth, pointSize, drawPoints, drawGapPoints, stepPlot, strategy);
+  this._drawPointsOnLine(ctx, pointsOnLine, drawPointCallback, setName, color, pointSize);
 
-  context.restore();
+  ctx.restore();
 };
 
-
-DygraphCanvasRenderer.prototype._renderChartLabels = function() {
-  var div, class_div;
-
-  // Generate divs for the chart title, xlabel and ylabel.
-  // Space for these divs has already been taken away from the charting area in
-  // the DygraphCanvasRenderer constructor.
-  if (this.attr_('title')) {
-    div = document.createElement("div");
-    div.style.position = 'absolute';
-    div.style.top = '0px';
-    div.style.left = this.area.x + 'px';
-    div.style.width = this.area.w + 'px';
-    div.style.height = this.attr_('titleHeight') + 'px';
-    div.style.textAlign = 'center';
-    div.style.fontSize = (this.attr_('titleHeight') - 8) + 'px';
-    div.style.fontWeight = 'bold';
-    class_div = document.createElement("div");
-    class_div.className = 'dygraph-label dygraph-title';
-    class_div.innerHTML = this.attr_('title');
-    div.appendChild(class_div);
-    this.container.appendChild(div);
-    this.chartLabels.title = div;
-  }
-
-  if (this.attr_('xlabel')) {
-    div = document.createElement("div");
-    div.style.position = 'absolute';
-    div.style.bottom = 0;  // TODO(danvk): this is lazy. Calculate style.top.
-    div.style.left = this.area.x + 'px';
-    div.style.width = this.area.w + 'px';
-    div.style.height = this.attr_('xLabelHeight') + 'px';
-    div.style.textAlign = 'center';
-    div.style.fontSize = (this.attr_('xLabelHeight') - 2) + 'px';
-
-    class_div = document.createElement("div");
-    class_div.className = 'dygraph-label dygraph-xlabel';
-    class_div.innerHTML = this.attr_('xlabel');
-    div.appendChild(class_div);
-    this.container.appendChild(div);
-    this.chartLabels.xlabel = div;
-  }
-
-  var that = this;
-  function createRotatedDiv(axis, classes, html) {
-    var box = {
-      left: 0,
-      top: that.area.y,
-      width: that.attr_('yLabelWidth'),
-      height: that.area.h
+var nonTrivialStrategy = function(renderer, ctx, color, strokeWidth, strokePattern) {
+  return new function() {
+    this.init = function() {  };
+    this.finish = function() { };
+    this.startSegment = function() {
+       ctx.beginPath();
+       ctx.strokeStyle = color;
+       ctx.lineWidth = strokeWidth;
+    };
+    this.endSegment = function() {
+      ctx.stroke(); // should this include closePath?
+    };
+    this.drawLine = function(x1, y1, x2, y2) {
+      renderer._dashedLine(ctx, x1, y1, x2, y2, strokePattern);
+    };
+    this.skipPixel = function(prevX, prevY, curX, curY) {
+      // TODO(konigsberg): optimize with http://jsperf.com/math-round-vs-hack/6 ?
+      return (Math.round(prevX) == Math.round(curX) &&
+           Math.round(prevY) == Math.round(curY));
     };
-    // TODO(danvk): is this outer div actually necessary?
-    div = document.createElement("div");
-    div.style.position = 'absolute';
-    if (axis == 1) {
-      div.style.left = box.left;
-    } else {
-      div.style.right = box.left;
-    }
-    div.style.top = box.top + 'px';
-    div.style.width = box.width + 'px';
-    div.style.height = box.height + 'px';
-    div.style.fontSize = (that.attr_('yLabelWidth') - 2) + 'px';
-
-    var inner_div = document.createElement("div");
-    inner_div.style.position = 'absolute';
-    inner_div.style.width = box.height + 'px';
-    inner_div.style.height = box.width + 'px';
-    inner_div.style.top = (box.height / 2 - box.width / 2) + 'px';
-    inner_div.style.left = (box.width / 2 - box.height / 2) + 'px';
-    inner_div.style.textAlign = 'center';
-
-    // CSS rotation is an HTML5 feature which is not standardized. Hence every
-    // browser has its own name for the CSS style.
-    var val = 'rotate(' + (axis == 1 ? '-' : '') + '90deg)';
-    inner_div.style.transform = val;        // HTML5
-    inner_div.style.WebkitTransform = val;  // Safari/Chrome
-    inner_div.style.MozTransform = val;     // Firefox
-    inner_div.style.OTransform = val;       // Opera
-    inner_div.style.msTransform = val;      // IE9
-
-    if (typeof(document.documentMode) !== 'undefined' &&
-        document.documentMode < 9) {
-      // We're dealing w/ an old version of IE, so we have to rotate the text
-      // using a BasicImage transform. This uses a different origin of rotation
-      // than HTML5 rotation (top left of div vs. its center).
-      inner_div.style.filter =
-          'progid:DXImageTransform.Microsoft.BasicImage(rotation=' +
-          (axis == 1 ? '3' : '1') + ')';
-      inner_div.style.left = '0px';
-      inner_div.style.top = '0px';
-    }
-
-    class_div = document.createElement("div");
-    class_div.className = classes;
-    class_div.innerHTML = html;
-
-    inner_div.appendChild(class_div);
-    div.appendChild(inner_div);
-    return div;
-  }
-
-  var div;
-  if (this.attr_('ylabel')) {
-    div = createRotatedDiv(1, 'dygraph-label dygraph-ylabel',
-                           this.attr_('ylabel'));
-    this.container.appendChild(div);
-    this.chartLabels.ylabel = div;
-  }
-  if (this.attr_('y2label') && this.dygraph_.numAxes() == 2) {
-    div = createRotatedDiv(2, 'dygraph-label dygraph-y2label',
-                           this.attr_('y2label'));
-    this.container.appendChild(div);
-    this.chartLabels.y2label = div;
-  }
-};
-
-
-DygraphCanvasRenderer.prototype._renderAnnotations = function() {
-  var annotationStyle = {
-    "position": "absolute",
-    "fontSize": this.attr_('axisLabelFontSize') + "px",
-    "zIndex": 10,
-    "overflow": "hidden"
   };
+};
 
-  var bindEvt = function(eventName, classEventName, p, self) {
-    return function(e) {
-      var a = p.annotation;
-      if (a.hasOwnProperty(eventName)) {
-        a[eventName](a, p, self.dygraph_, e);
-      } else if (self.dygraph_.attr_(classEventName)) {
-        self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e );
-      }
+var trivialStrategy = function(ctx, color, strokeWidth) {
+  return new function() {
+    this.init = function() {
+      ctx.beginPath();
+      ctx.strokeStyle = color;
+      ctx.lineWidth = strokeWidth;
+    };
+    this.finish = function() {
+      ctx.stroke(); // should this include closePath?
+    };
+    this.startSegment = function() { };
+    this.endSegment = function() { };
+    this.drawLine = function(x1, y1, x2, y2) {
+      ctx.moveTo(x1, y1);
+      ctx.lineTo(x2, y2);
+    };
+    // don't skip pixels.
+    this.skipPixel = function() {
+      return false;
     };
   };
-
-  // Get a list of point with annotations.
-  var points = this.layout.annotated_points;
-  for (var i = 0; i < points.length; i++) {
-    var p = points[i];
-    if (p.canvasx < this.area.x || p.canvasx > this.area.x + this.area.w ||
-        p.canvasy < this.area.y || p.canvasy > this.area.y + this.area.h) {
-      continue;
-    }
-
-    var a = p.annotation;
-    var tick_height = 6;
-    if (a.hasOwnProperty("tickHeight")) {
-      tick_height = a.tickHeight;
-    }
-
-    var div = document.createElement("div");
-    for (var name in annotationStyle) {
-      if (annotationStyle.hasOwnProperty(name)) {
-        div.style[name] = annotationStyle[name];
-      }
-    }
-    if (!a.hasOwnProperty('icon')) {
-      div.className = "dygraphDefaultAnnotation";
-    }
-    if (a.hasOwnProperty('cssClass')) {
-      div.className += " " + a.cssClass;
-    }
-
-    var width = a.hasOwnProperty('width') ? a.width : 16;
-    var height = a.hasOwnProperty('height') ? a.height : 16;
-    if (a.hasOwnProperty('icon')) {
-      var img = document.createElement("img");
-      img.src = a.icon;
-      img.width = width;
-      img.height = height;
-      div.appendChild(img);
-    } else if (p.annotation.hasOwnProperty('shortText')) {
-      div.appendChild(document.createTextNode(p.annotation.shortText));
-    }
-    div.style.left = (p.canvasx - width / 2) + "px";
-    if (a.attachAtBottom) {
-      div.style.top = (this.area.h - height - tick_height) + "px";
-    } else {
-      div.style.top = (p.canvasy - height - tick_height) + "px";
-    }
-    div.style.width = width + "px";
-    div.style.height = height + "px";
-    div.title = p.annotation.text;
-    div.style.color = this.colors[p.name];
-    div.style.borderColor = this.colors[p.name];
-    a.div = div;
-
-    this.dygraph_.addEvent(div, 'click',
-        bindEvt('clickHandler', 'annotationClickHandler', p, this));
-    this.dygraph_.addEvent(div, 'mouseover',
-        bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this));
-    this.dygraph_.addEvent(div, 'mouseout',
-        bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this));
-    this.dygraph_.addEvent(div, 'dblclick',
-        bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this));
-
-    this.container.appendChild(div);
-    this.annotations.push(div);
-
-    var ctx = this.elementContext;
-    ctx.strokeStyle = this.colors[p.name];
-    ctx.beginPath();
-    if (!a.attachAtBottom) {
-      ctx.moveTo(p.canvasx, p.canvasy);
-      ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height);
-    } else {
-      ctx.moveTo(p.canvasx, this.area.h);
-      ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height);
-    }
-    ctx.closePath();
-    ctx.stroke();
-  }
 };
 
-DygraphCanvasRenderer.makeNextPointStep_ = function(
-    connect, points, start, end) {
-  if (connect) {
-    return function(j) {
-      while (++j + start < end) {
-        if (!(points[start + j].yval === null)) break;
-      }
-      return j;
-    }
-  } else {
-    return function(j) { return j + 1 };
+DygraphCanvasRenderer.prototype._drawPointsOnLine = function(ctx, pointsOnLine, drawPointCallback, setName, color, pointSize) {
+  for (var idx = 0; idx < pointsOnLine.length; idx++) {
+    var cb = pointsOnLine[idx];
+    ctx.save();
+    drawPointCallback(
+        this.dygraph_, setName, ctx, cb[0], cb[1], color, pointSize);
+    ctx.restore();
   }
-};
+}
 
-DygraphCanvasRenderer.prototype._drawStyledLine = function(
-    ctx, i, setName, color, strokeWidth, strokePattern, drawPoints,
-    drawPointCallback, pointSize) {
-  var isNullOrNaN = function(x) {
-    return (x === null || isNaN(x));
-  };
+DygraphCanvasRenderer.prototype._drawSeries = function(
+    ctx, iter, strokeWidth, pointSize, drawPoints, drawGapPoints,
+    stepPlot, strategy) {
 
-  var stepPlot = this.attr_("stepPlot");
-  var firstIndexInSet = this.layout.setPointsOffsets[i];
-  var setLength = this.layout.setPointsLengths[i];
-  var afterLastIndexInSet = firstIndexInSet + setLength;
-  var points = this.layout.points;
-  var prevX = null;
-  var prevY = null;
-  var nextY = null;
+  var prevCanvasX = null;
+  var prevCanvasY = null;
+  var nextCanvasY = null;
+  var isIsolated; // true if this point is isolated (no line segments)
+  var point; // the point being processed in the while loop
   var pointsOnLine = []; // Array of [canvasx, canvasy] pairs.
-  if (!Dygraph.isArrayLike(strokePattern)) {
-    strokePattern = null;
-  }
-  var drawGapPoints = this.dygraph_.attr_('drawGapEdgePoints', setName);
+  var first = true; // the first cycle through the while loop
 
-  var point, nextPoint;
-  var next = DygraphCanvasRenderer.makeNextPointStep_(
-      this.attr_('connectSeparatedPoints'), points, firstIndexInSet,
-      afterLastIndexInSet);
-  ctx.save();
-  for (var j = 0; j < setLength; j = next(j)) {
-    point = points[firstIndexInSet + j];
-    nextY = (next(j) < setLength) ?
-        points[firstIndexInSet + next(j)].canvasy : null;
-    if (isNullOrNaN(point.canvasy)) {
-      if (stepPlot && prevX !== null) {
+  strategy.init();
+
+  while(iter.hasNext()) {
+    point = iter.next();
+    if (point.canvasy === null || point.canvasy != point.canvasy) {
+      if (stepPlot && prevCanvasX !== null) {
         // Draw a horizontal line to the start of the missing data
-        ctx.beginPath();
-        ctx.strokeStyle = color;
-        ctx.lineWidth = this.attr_('strokeWidth');
-        this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern);
-        ctx.stroke();
+        strategy.startSegment();
+        strategy.drawLine(prevX, prevY, point.canvasx, prevY);
+        strategy.endSegment();
       }
-      // this will make us move to the next point, not draw a line to it.
-      prevX = prevY = null;
+      prevCanvasX = prevCanvasY = null;
     } else {
-      // A point is "isolated" if it is non-null but both the previous
-      // and next points are null.
-      var isIsolated = (!prevX && isNullOrNaN(nextY));
+      nextCanvasY = iter.hasNext() ? iter.peek().canvasy : null;
+      // TODO: we calculate isNullOrNaN for this point, and the next, and then, when
+      // we iterate, test for isNullOrNaN again. Why bother?
+      var isNextCanvasYNullOrNaN = nextCanvasY === null || nextCanvasY != nextCanvasY;
+      isIsolated = (!prevCanvasX && isNextCanvasYNullOrNaN);
       if (drawGapPoints) {
-        // Also consider a point to be is "isolated" if it's adjacent to a
+        // Also consider a point to be "isolated" if it's adjacent to a
         // null point, excluding the graph edges.
-        if ((j > 0 && !prevX) ||
-            (next(j) < setLength && isNullOrNaN(nextY))) {
+        if ((!first && !prevCanvasX) ||
+            (iter.hasNext() && isNextCanvasYNullOrNaN)) {
           isIsolated = true;
         }
       }
-      if (prevX === null) {
-        prevX = point.canvasx;
-        prevY = point.canvasy;
-      } else {
-        // Skip over points that will be drawn in the same pixel.
-        if (Math.round(prevX) == Math.round(point.canvasx) &&
-            Math.round(prevY) == Math.round(point.canvasy)) {
+      if (prevCanvasX !== null) {
+        if (strategy.skipPixel(prevCanvasX, prevCanvasY, point.canvasx, point.canvasy)) {
           continue;
         }
-        // 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 = strokeWidth;
+          strategy.startSegment();
           if (stepPlot) {
-            this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern);
-            prevX = point.canvasx;
+            strategy.drawLine(prevCanvasX, prevCanvasY, point.canvasx, prevCanvasY);
+            prevCanvasX = point.canvasx;
           }
-          this._dashedLine(ctx, prevX, prevY, point.canvasx, point.canvasy, strokePattern);
-          prevX = point.canvasx;
-          prevY = point.canvasy;
-          ctx.stroke();
+          strategy.drawLine(prevCanvasX, prevCanvasY, point.canvasx, point.canvasy);      
+          strategy.endSegment();
         }
       }
-
       if (drawPoints || isIsolated) {
         pointsOnLine.push([point.canvasx, point.canvasy]);
       }
+      prevCanvasX = point.canvasx;
+      prevCanvasY = point.canvasy;
     }
+    first = false;
   }
-  for (var idx = 0; idx < pointsOnLine.length; idx++) {
-    var cb = pointsOnLine[idx];
-    ctx.save();
-    drawPointCallback(
-        this.dygraph_, setName, ctx, cb[0], cb[1], color, pointSize);
-    ctx.restore();
-  }
-  ctx.restore();
+  strategy.finish();
+  return pointsOnLine;
 };
 
 DygraphCanvasRenderer.prototype._drawLine = function(ctx, i) {
@@ -778,6 +456,7 @@ DygraphCanvasRenderer.prototype._drawLine = function(ctx, i) {
   var borderWidth = this.dygraph_.attr_("strokeBorderWidth", setName);
   var drawPointCallback = this.dygraph_.attr_("drawPointCallback", setName) ||
       Dygraph.Circles.DEFAULT;
+
   if (borderWidth && strokeWidth) {
     this._drawStyledLine(ctx, i, setName,
         this.dygraph_.attr_("strokeBorderColor", setName),
@@ -812,19 +491,19 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
   var stepPlot = this.attr_("stepPlot");
   var points = this.layout.points;
   var pointsLength = points.length;
-  var point, i, j, prevX, prevY, prevYs, color, setName, newYs, err_color, rgb, yscale, axis;
+  var point, i, prevX, prevY, prevYs, color, setName, newYs, err_color, rgb, yscale, axis;
 
   var setNames = this.layout.setNames;
   var setCount = setNames.length;
 
-  // TODO(danvk): Move this mapping into Dygraph and get it out of here.
-  this.colors = {};
-  for (i = 0; i < setCount; i++) {
-    this.colors[setNames[i]] = this.colorScheme_[i % this.colorScheme_.length];
-  }
+  this.colors = this.dygraph_.colorsMap_;
 
   // Update Points
   // TODO(danvk): here
+  //
+  // TODO(bhs): this loop is a hot-spot for high-point-count charts. These
+  // transformations can be pushed into the canvas via linear transformation
+  // matrices.
   for (i = pointsLength; i--;) {
     point = points[i];
     point.canvasx = this.area.w * point.x + this.area.x;
@@ -845,11 +524,9 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
 
       var firstIndexInSet = this.layout.setPointsOffsets[i];
       var setLength = this.layout.setPointsLengths[i];
-      var afterLastIndexInSet = firstIndexInSet + setLength;
 
-      var next = DygraphCanvasRenderer.makeNextPointStep_(
-        this.attr_('connectSeparatedPoints'), points,
-        afterLastIndexInSet);
+      var iter = Dygraph.createIterator(points, firstIndexInSet, setLength,
+          DygraphCanvasRenderer._getIteratorPredicate(this.attr_("connectSeparatedPoints")));
 
       // setup graphics context
       prevX = NaN;
@@ -862,8 +539,8 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
                             fillAlpha + ')';
       ctx.fillStyle = err_color;
       ctx.beginPath();
-      for (j = firstIndexInSet; j < afterLastIndexInSet; j = next(j)) {
-        point = points[j];
+      while (iter.hasNext()) {
+        point = iter.next();
         if (point.name == setName) { // TODO(klausw): this is always true
           if (!Dygraph.isOK(point.y)) {
             prevX = NaN;
@@ -917,11 +594,9 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
       axisY = this.area.h * axisY + this.area.y;
       var firstIndexInSet = this.layout.setPointsOffsets[i];
       var setLength = this.layout.setPointsLengths[i];
-      var afterLastIndexInSet = firstIndexInSet + setLength;
 
-      var next = DygraphCanvasRenderer.makeNextPointStep_(
-        this.attr_('connectSeparatedPoints'), points,
-        afterLastIndexInSet);
+      var iter = Dygraph.createIterator(points, firstIndexInSet, setLength,
+          DygraphCanvasRenderer._getIteratorPredicate(this.attr_("connectSeparatedPoints")));
 
       // setup graphics context
       prevX = NaN;
@@ -933,8 +608,8 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
                             fillAlpha + ')';
       ctx.fillStyle = err_color;
       ctx.beginPath();
-      for (j = firstIndexInSet; j < afterLastIndexInSet; j = next(j)) {
-        point = points[j];
+      while(iter.hasNext()) {
+        point = iter.next();
         if (point.name == setName) { // TODO(klausw): this is always true
           if (!Dygraph.isOK(point.y)) {
             prevX = NaN;
@@ -953,7 +628,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
               }
             }
             newYs = [ point.canvasy, lastY ];
-            
+
             if(stepPlot) {
               // Step plots must keep track of the top and bottom of
               // the baseline at each point.
@@ -965,13 +640,13 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
             } else {
               baseline[point.canvasx] = point.canvasy;
             }
-            
+
           } else {
             newYs = [ point.canvasy, axisY ];
           }
           if (!isNaN(prevX)) {
             ctx.moveTo(prevX, prevYs[0]);
-            
+
             if (stepPlot) {
               ctx.lineTo(point.canvasx, prevYs[0]);
               if(currBaseline) {
@@ -984,7 +659,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
               ctx.lineTo(point.canvasx, newYs[0]);
               ctx.lineTo(point.canvasx, newYs[1]);
             }
-            
+
             ctx.lineTo(prevX, prevYs[1]);
             ctx.closePath();
           }