X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-canvas.js;h=6bf5fbcb457e187bb089ce0b93f395e1d9d6423f;hb=a22cc80916b6e165451995e1ae3ed4d36dc86eab;hp=fad305447bbdb9c2f0b628394e92816ea8e585dc;hpb=7249a5aa13b2861eb6e79ca39059233fc6ed701d;p=dygraphs.git

diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index fad3054..6bf5fbc 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -25,7 +25,7 @@
  */
 
 /*jshint globalstrict: true */
-/*global Dygraph:false,RGBColorParser:false */
+/*global Dygraph:false */
 "use strict";
 
 
@@ -39,8 +39,8 @@
  * 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 {Dygraph} dygraph The chart to which this renderer belongs.
+ * @param {HTMLCanvasElement} element The <canvas> DOM element on which to draw.
  * @param {CanvasRenderingContext2D} elementContext The drawing context.
  * @param {DygraphLayout} layout The chart's DygraphLayout object.
  *
@@ -58,7 +58,8 @@ var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) {
   this.width = this.element.width;
 
   // --- check whether everything is ok before we return
-  if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element)))
+  // NOTE(konigsberg): isIE is never defined in this object. Bug of some sort.
+  if (!this.isIE && !(Dygraph.isCanvasSupported(this.element)))
       throw "Canvas is not supported.";
 
   // internal state
@@ -88,15 +89,6 @@ var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) {
 };
 
 /**
- * This just forwards to dygraph.attr_.
- * TODO(danvk): remove this?
- * @private
- */
-DygraphCanvasRenderer.prototype.attr_ = function(name, opt_seriesName) {
-  return this.dygraph_.attr_(name, opt_seriesName);
-};
-
-/**
  * Clears out all chart content and DOM elements.
  * This is called immediately before render() on every frame, including
  * during zooms and pans.
@@ -126,30 +118,6 @@ DygraphCanvasRenderer.prototype.clear = function() {
 };
 
 /**
- * Checks whether the browser supports the <canvas> tag.
- * @private
- */
-DygraphCanvasRenderer.isSupported = function(canvasName) {
-  var canvas = null;
-  try {
-    if (typeof(canvasName) == 'undefined' || canvasName === null) {
-      canvas = document.createElement("canvas");
-    } else {
-      canvas = canvasName;
-    }
-    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;
-};
-
-/**
  * 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
@@ -261,17 +229,19 @@ DygraphCanvasRenderer._drawStyledLine = function(e,
     drawPointCallback, pointSize) {
   var g = e.dygraph;
   // TODO(konigsberg): Compute attributes outside this method call.
-  var stepPlot = g.getOption("stepPlot");  // TODO(danvk): per-series
+  var stepPlot = g.getBooleanOption("stepPlot", e.setName);
+
   if (!Dygraph.isArrayLike(strokePattern)) {
     strokePattern = null;
   }
 
-  var drawGapPoints = g.getOption('drawGapEdgePoints', e.setName);
+  var drawGapPoints = g.getBooleanOption('drawGapEdgePoints', e.setName);
 
   var points = e.points;
+  var setName = e.setName;
   var iter = Dygraph.createIterator(points, 0, points.length,
       DygraphCanvasRenderer._getIteratorPredicate(
-          g.getOption("connectSeparatedPoints")));  // TODO(danvk): per-series?
+          g.getBooleanOption("connectSeparatedPoints", setName)));
 
   var stroking = strokePattern && (strokePattern.length >= 2);
 
@@ -332,6 +302,9 @@ DygraphCanvasRenderer._drawSeries = function(e,
       point = arr[i];
     }
 
+    // FIXME: The 'canvasy != canvasy' test here catches NaN values but the test
+    // doesn't catch Infinity values. Could change this to
+    // !isFinite(point.canvasy), but I assume it avoids isNaN for performance?
     if (point.canvasy === null || point.canvasy != point.canvasy) {
       if (stepPlot && prevCanvasX !== null) {
         // Draw a horizontal line to the start of the missing data
@@ -343,7 +316,7 @@ DygraphCanvasRenderer._drawSeries = function(e,
       isIsolated = false;
       if (drawGapPoints || !prevCanvasX) {
         iter.nextIdx_ = i;
-        var peek = iter.next();
+        iter.next();
         nextCanvasY = iter.hasNext ? iter.peek.canvasy : null;
 
         var isNextCanvasYNullOrNaN = nextCanvasY === null ||
@@ -372,7 +345,7 @@ DygraphCanvasRenderer._drawSeries = function(e,
         ctx.moveTo(point.canvasx, point.canvasy);
       }
       if (drawPoints || isIsolated) {
-        pointsOnLine.push([point.canvasx, point.canvasy]);
+        pointsOnLine.push([point.canvasx, point.canvasy, point.idx]);
       }
       prevCanvasX = point.canvasx;
       prevCanvasY = point.canvasy;
@@ -397,7 +370,7 @@ DygraphCanvasRenderer._drawPointsOnLine = function(
     var cb = pointsOnLine[idx];
     ctx.save();
     drawPointCallback(
-        e.dygraph, e.setName, ctx, cb[0], cb[1], color, pointSize);
+        e.dygraph, e.setName, ctx, cb[0], cb[1], color, pointSize, cb[2]);
     ctx.restore();
   }
 };
@@ -432,31 +405,30 @@ DygraphCanvasRenderer.prototype._updatePoints = function() {
 
 /**
  * Add canvas Actually draw the lines chart, including error bars.
- * If opt_seriesName is specified, only that series will be drawn.
- * (This is used for expedited redrawing with highlightSeriesOpts)
- * Lines are typically drawn in the non-interactive dygraph canvas. If opt_ctx
- * is specified, they can be drawn elsewhere.
  *
  * This function can only be called if DygraphLayout's points array has been
  * updated with canvas{x,y} attributes, i.e. by
  * DygraphCanvasRenderer._updatePoints.
+ *
+ * @param {string=} opt_seriesName when specified, only that series will
+ *     be drawn. (This is used for expedited redrawing with highlightSeriesOpts)
+ * @param {CanvasRenderingContext2D} opt_ctx when specified, the drawing
+ *     context.  However, lines are typically drawn on the object's
+ *     elementContext.
  * @private
  */
 DygraphCanvasRenderer.prototype._renderLineChart = function(opt_seriesName, opt_ctx) {
   var ctx = opt_ctx || this.elementContext;
-  var errorBars = this.attr_("errorBars") || this.attr_("customBars");
-  var fillGraph = this.attr_("fillGraph");
   var i;
 
   var sets = this.layout.points;
   var setNames = this.layout.setNames;
-  var setCount = setNames.length;
   var setName;
 
   this.colors = this.dygraph_.colorsMap_;
 
   // Determine which series have specialized plotters.
-  var plotter_attr = this.attr_("plotter");
+  var plotter_attr = this.dygraph_.getOption("plotter");
   var plotters = plotter_attr;
   if (!Dygraph.isArrayLike(plotters)) {
     plotters = [plotters];
@@ -465,7 +437,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function(opt_seriesName, opt_
   var setPlotters = {};  // series name -> plotter fn.
   for (i = 0; i < setNames.length; i++) {
     setName = setNames[i];
-    var setPlotter = this.attr_("plotter", setName);
+    var setPlotter = this.dygraph_.getOption("plotter", setName);
     if (setPlotter == plotter_attr) continue;  // not specialized.
 
     setPlotters[setName] = setPlotter;
@@ -509,6 +481,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function(opt_seriesName, opt_
         plotArea: this.area,
         seriesIndex: j,
         seriesCount: sets.length,
+        singleSeriesName: opt_seriesName,
         allSeriesPoints: sets
       });
       ctx.restore();
@@ -546,12 +519,12 @@ DygraphCanvasRenderer._linePlotter = function(e) {
   // TODO(danvk): Check if there's any performance impact of just calling
   // getOption() inside of _drawStyledLine. Passing in so many parameters makes
   // this code a bit nasty.
-  var borderWidth = g.getOption("strokeBorderWidth", setName);
+  var borderWidth = g.getNumericOption("strokeBorderWidth", setName);
   var drawPointCallback = g.getOption("drawPointCallback", setName) ||
       Dygraph.Circles.DEFAULT;
   var strokePattern = g.getOption("strokePattern", setName);
-  var drawPoints = g.getOption("drawPoints", setName);
-  var pointSize = g.getOption("pointSize", setName);
+  var drawPoints = g.getBooleanOption("drawPoints", setName);
+  var pointSize = g.getNumericOption("pointSize", setName);
 
   if (borderWidth && strokeWidth) {
     DygraphCanvasRenderer._drawStyledLine(e,
@@ -583,24 +556,24 @@ DygraphCanvasRenderer._linePlotter = function(e) {
 DygraphCanvasRenderer._errorPlotter = function(e) {
   var g = e.dygraph;
   var setName = e.setName;
-  var errorBars = g.getOption("errorBars") || g.getOption("customBars");
+  var errorBars = g.getBooleanOption("errorBars") ||
+      g.getBooleanOption("customBars");
   if (!errorBars) return;
 
-  var fillGraph = g.getOption("fillGraph", setName);
+  var fillGraph = g.getBooleanOption("fillGraph", setName);
   if (fillGraph) {
-    g.warn("Can't use fillGraph option with error bars");
+    Dygraph.warn("Can't use fillGraph option with error bars");
   }
 
   var ctx = e.drawingContext;
   var color = e.color;
-  var fillAlpha = g.getOption('fillAlpha', setName);
-  var stepPlot = g.getOption('stepPlot');  // TODO(danvk): per-series
-  var axis = e.axis;
+  var fillAlpha = g.getNumericOption('fillAlpha', setName);
+  var stepPlot = g.getBooleanOption("stepPlot", setName);
   var points = e.points;
 
   var iter = Dygraph.createIterator(points, 0, points.length,
       DygraphCanvasRenderer._getIteratorPredicate(
-          g.getOption("connectSeparatedPoints")));
+          g.getBooleanOption("connectSeparatedPoints", setName)));
 
   var newYs;
 
@@ -608,9 +581,8 @@ DygraphCanvasRenderer._errorPlotter = function(e) {
   var prevX = NaN;
   var prevY = NaN;
   var prevYs = [-1, -1];
-  var yscale = axis.yscale;
   // should be same color as the lines but only 15% opaque.
-  var rgb = new RGBColorParser(color);
+  var rgb = Dygraph.toRGB_(color);
   var err_color =
       'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')';
   ctx.fillStyle = err_color;
@@ -668,6 +640,9 @@ DygraphCanvasRenderer._errorPlotter = function(e) {
  * @private
  */
 DygraphCanvasRenderer._fillPlotter = function(e) {
+  // Skip if we're drawing a single series for interactive highlight overlay.
+  if (e.singleSeriesName) return;
+
   // We'll handle all the series at once, not one-by-one.
   if (e.seriesIndex !== 0) return;
 
@@ -683,7 +658,7 @@ DygraphCanvasRenderer._fillPlotter = function(e) {
 
   var anySeriesFilled = (function() {
     for (var i = 0; i < setNames.length; i++) {
-      if (g.getOption("fillGraph", setNames[i])) return true;
+      if (g.getBooleanOption("fillGraph", setNames[i])) return true;
     }
     return false;
   })();
@@ -695,19 +670,27 @@ DygraphCanvasRenderer._fillPlotter = function(e) {
   var sets = e.allSeriesPoints;
   var setCount = sets.length;
 
-  var fillAlpha = g.getOption('fillAlpha');
-  var stepPlot = g.getOption('stepPlot');
-  var stackedGraph = g.getOption("stackedGraph");
+  var fillAlpha = g.getNumericOption('fillAlpha');
+  var stackedGraph = g.getBooleanOption("stackedGraph");
   var colors = g.getColors();
 
-  var baseline = {};  // for stacked graphs: baseline for filling
+  // For stacked graphs, track the baseline for filling.
+  //
+  // The filled areas below graph lines are trapezoids with two
+  // vertical edges. The top edge is the line segment being drawn, and
+  // the baseline is the bottom edge. Each baseline corresponds to the
+  // top line segment from the previous stacked line. In the case of
+  // step plots, the trapezoids are rectangles.
+  var baseline = {};
   var currBaseline;
+  var prevStepPlot;  // for different line drawing modes (line/step) per series
 
   // process sets in reverse order (needed for stacked graphs)
   for (var setIdx = setCount - 1; setIdx >= 0; setIdx--) {
     var setName = setNames[setIdx];
-    if (!g.getOption('fillGraph', setName)) continue;
-
+    if (!g.getBooleanOption('fillGraph', setName)) continue;
+    
+    var stepPlot = g.getBooleanOption('stepPlot', setName);
     var color = colors[setIdx];
     var axis = g.axisPropertiesForSeries(setName);
     var axisY = 1.0 + axis.minyval * axis.yscale;
@@ -718,32 +701,42 @@ DygraphCanvasRenderer._fillPlotter = function(e) {
     var points = sets[setIdx];
     var iter = Dygraph.createIterator(points, 0, points.length,
         DygraphCanvasRenderer._getIteratorPredicate(
-            g.getOption("connectSeparatedPoints")));
+            g.getBooleanOption("connectSeparatedPoints", setName)));
 
     // setup graphics context
     var prevX = NaN;
     var prevYs = [-1, -1];
     var newYs;
-    var yscale = axis.yscale;
     // should be same color as the lines but only 15% opaque.
-    var rgb = new RGBColorParser(color);
+    var rgb = Dygraph.toRGB_(color);
     var err_color =
         'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')';
     ctx.fillStyle = err_color;
     ctx.beginPath();
-    while(iter.hasNext) {
+    var last_x, is_first = true;
+    while (iter.hasNext) {
       var point = iter.next();
       if (!Dygraph.isOK(point.y)) {
         prevX = NaN;
+        if (point.y_stacked !== null && !isNaN(point.y_stacked)) {
+          baseline[point.canvasx] = area.h * point.y_stacked + area.y;
+        }
         continue;
       }
       if (stackedGraph) {
+        if (!is_first && last_x == point.xval) {
+          continue;
+        } else {
+          is_first = false;
+          last_x = point.xval;
+        }
+
         currBaseline = baseline[point.canvasx];
         var lastY;
         if (currBaseline === undefined) {
           lastY = axisY;
         } else {
-          if(stepPlot) {
+          if(prevStepPlot) {
             lastY = currBaseline[0];
           } else {
             lastY = currBaseline;
@@ -768,17 +761,18 @@ DygraphCanvasRenderer._fillPlotter = function(e) {
       }
       if (!isNaN(prevX)) {
         ctx.moveTo(prevX, prevYs[0]);
-
+        
+        // Move to top fill point
         if (stepPlot) {
           ctx.lineTo(point.canvasx, prevYs[0]);
-          if(currBaseline) {
-            // Draw to the bottom of the baseline
-            ctx.lineTo(point.canvasx, currBaseline[1]);
-          } else {
-            ctx.lineTo(point.canvasx, newYs[1]);
-          }
         } else {
           ctx.lineTo(point.canvasx, newYs[0]);
+        }
+        // Move to bottom fill point
+        if (prevStepPlot && currBaseline) {
+          // Draw to the bottom of the baseline
+          ctx.lineTo(point.canvasx, currBaseline[1]);
+        } else {
           ctx.lineTo(point.canvasx, newYs[1]);
         }
 
@@ -788,6 +782,7 @@ DygraphCanvasRenderer._fillPlotter = function(e) {
       prevYs = newYs;
       prevX = point.canvasx;
     }
+    prevStepPlot = stepPlot;
     ctx.fill();
   }
 };