X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-canvas.js;h=3c1d40c0fc7ea9ce2139a0b635e48ab67c815fe9;hb=966ac3fa0de18a7b5ddefe4aba6938d8358ea0cf;hp=10936dee1e234c20c8495fec66569ec52761296c;hpb=4270a2836fae730a6c3e0590d4a6fba7d63f86bc;p=dygraphs.git

diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index 10936de..3c1d40c 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -186,6 +186,7 @@ DygraphCanvasRenderer.prototype.render = function() {
       ctx.closePath();
       ctx.stroke();
     }
+    ctx.restore();
   }
 
   if (this.attr_('drawXGrid')) {
@@ -202,6 +203,7 @@ DygraphCanvasRenderer.prototype.render = function() {
       ctx.closePath();
       ctx.stroke();
     }
+    ctx.restore();
   }
 
   // Do the ordinary rendering, as before
@@ -584,7 +586,8 @@ DygraphCanvasRenderer.prototype._renderAnnotations = function() {
   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) {
+    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;
     }
 
@@ -658,6 +661,128 @@ DygraphCanvasRenderer.prototype._renderAnnotations = function() {
   }
 };
 
+DygraphCanvasRenderer.makeNextPointStep_ = function(connect, points, end) {
+  if (connect) {
+    return function(j) {
+      while (++j < end) {
+        if (!(points[j].yval === null)) break;
+      }
+      return j;
+    }
+  } else {
+    return function(j) { return j + 1 };
+  }
+};
+
+DygraphCanvasRenderer.prototype._drawStyledLine = function(
+    ctx, i, setName, color, strokeWidth, strokePattern, drawPoints,
+    drawPointCallback, pointSize) {
+  var isNullOrNaN = function(x) {
+    return (x === null || isNaN(x));
+  };
+
+  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 pointsOnLine = []; // Array of [canvasx, canvasy] pairs.
+  if (!Dygraph.isArrayLike(strokePattern)) {
+    strokePattern = null;
+  }
+
+  var point;
+  var next = DygraphCanvasRenderer.makeNextPointStep_(
+      this.attr_('connectSeparatedPoints'), points, afterLastIndexInSet);
+  ctx.save();
+  for (var j = firstIndexInSet; j < afterLastIndexInSet; j = next(j)) {
+    point = points[j];
+    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');
+        this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern);
+        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 {
+        // 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)) {
+          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;
+          if (stepPlot) {
+            this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern);
+            prevX = point.canvasx;
+          }
+          this._dashedLine(ctx, prevX, prevY, point.canvasx, point.canvasy, strokePattern);
+          prevX = point.canvasx;
+          prevY = point.canvasy;
+          ctx.stroke();
+        }
+      }
+
+      if (drawPoints || isIsolated) {
+        pointsOnLine.push([point.canvasx, point.canvasy]);
+      }
+    }
+  }
+  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();
+};
+
+DygraphCanvasRenderer.prototype._drawLine = function(ctx, i) {
+  var setNames = this.layout.setNames;
+  var setName = setNames[i];
+
+  var strokeWidth = this.dygraph_.attr_("strokeWidth", setName);
+  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),
+        strokeWidth + 2 * borderWidth,
+        this.dygraph_.attr_("strokePattern", setName),
+        this.dygraph_.attr_("drawPoints", setName),
+        drawPointCallback,
+        this.dygraph_.attr_("pointSize", setName));
+  }
+
+  this._drawStyledLine(ctx, i, setName,
+      this.colors[setName],
+      strokeWidth,
+      this.dygraph_.attr_("strokePattern", setName),
+      this.dygraph_.attr_("drawPoints", setName),
+      drawPointCallback,
+      this.dygraph_.attr_("pointSize", setName));
+};
 
 /**
  * Actually draw the lines chart, including error bars.
@@ -665,12 +790,8 @@ DygraphCanvasRenderer.prototype._renderAnnotations = function() {
  * @private
  */
 DygraphCanvasRenderer.prototype._renderLineChart = function() {
-  var isNullOrNaN = function(x) {
-    return (x === null || isNaN(x));
-  };
-
   // TODO(danvk): use this.attr_ for many of these.
-  var context = this.elementContext;
+  var ctx = this.elementContext;
   var fillAlpha = this.attr_('fillAlpha');
   var errorBars = this.attr_("errorBars") || this.attr_("customBars");
   var fillGraph = this.attr_("fillGraph");
@@ -698,8 +819,8 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
   }
 
   // create paths
-  var ctx = context;
   if (errorBars) {
+    ctx.save();
     if (fillGraph) {
       this.dygraph_.warn("Can't use fillGraph option with error bars");
     }
@@ -709,8 +830,15 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
       axis = this.dygraph_.axisPropertiesForSeries(setName);
       color = this.colors[setName];
 
+      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);
+
       // setup graphics context
-      ctx.save();
       prevX = NaN;
       prevY = NaN;
       prevYs = [-1, -1];
@@ -721,9 +849,9 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
                             fillAlpha + ')';
       ctx.fillStyle = err_color;
       ctx.beginPath();
-      for (j = 0; j < pointsLength; j++) {
+      for (j = firstIndexInSet; j < afterLastIndexInSet; j = next(j)) {
         point = points[j];
-        if (point.name == setName) {
+        if (point.name == setName) { // TODO(klausw): this is always true
           if (!Dygraph.isOK(point.y)) {
             prevX = NaN;
             continue;
@@ -759,7 +887,9 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
       }
       ctx.fill();
     }
+    ctx.restore();
   } else if (fillGraph) {
+    ctx.save();
     var baseline = [];  // for stacked graphs: baseline for filling
 
     // process sets in reverse order (needed for stacked graphs)
@@ -771,9 +901,15 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
       if (axisY < 0.0) axisY = 0.0;
       else if (axisY > 1.0) axisY = 1.0;
       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);
 
       // setup graphics context
-      ctx.save();
       prevX = NaN;
       prevYs = [-1, -1];
       yscale = axis.yscale;
@@ -783,9 +919,9 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
                             fillAlpha + ')';
       ctx.fillStyle = err_color;
       ctx.beginPath();
-      for (j = 0; j < pointsLength; j++) {
+      for (j = firstIndexInSet; j < afterLastIndexInSet; j = next(j)) {
         point = points[j];
-        if (point.name == setName) {
+        if (point.name == setName) { // TODO(klausw): this is always true
           if (!Dygraph.isOK(point.y)) {
             prevX = NaN;
             continue;
@@ -815,98 +951,13 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
       }
       ctx.fill();
     }
+    ctx.restore();
   }
 
   // Drawing the lines.
-  var firstIndexInSet = 0;
-  var afterLastIndexInSet = 0;
-  var setLength = 0;
   for (i = 0; i < setCount; i += 1) {
-    firstIndexInSet = this.layout.setPointsOffsets[i];
-    setLength = this.layout.setPointsLengths[i];
-    afterLastIndexInSet = firstIndexInSet + setLength;
-    setName = setNames[i];
-    color = this.colors[setName];
-    var strokeWidth = this.dygraph_.attr_("strokeWidth", setName);
-
-    // setup graphics context
-    // TODO(konigsberg): This function has ctx and context. Clarify the difference.
-    context.save();
-    var pointSize = this.dygraph_.attr_("pointSize", setName);
-    prevX = null;
-    prevY = null;
-    var drawPoints = this.dygraph_.attr_("drawPoints", setName);
-    var drawPointCallback = this.dygraph_.attr_("drawPointCallback", setName);
-    if (!drawPointCallback) {
-      drawPointCallback = Dygraph.Circles.DEFAULT;
-    }
-    var pointsOnLine = []; // Array of [canvasx, canvasy] pairs.
-    var strokePattern = this.dygraph_.attr_("strokePattern", setName);
-    if (!Dygraph.isArrayLike(strokePattern)) {
-      strokePattern = null;
-    }
-    for (j = firstIndexInSet; j < afterLastIndexInSet; j++) {
-      point = points[j];
-      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');
-          this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern);
-          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 {
-          // 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)) {
-            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;
-            if (stepPlot) {
-              this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern);
-              prevX = point.canvasx;
-            }
-            this._dashedLine(ctx, prevX, prevY, point.canvasx, point.canvasy, strokePattern);
-            prevX = point.canvasx;
-            prevY = point.canvasy;
-            ctx.stroke();
-          }
-        }
-
-        if (drawPoints || isIsolated) {
-          pointsOnLine.push([point.canvasx, point.canvasy]);
-        }
-      }
-    }
-    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();
-
-    }
-    firstIndexInSet = afterLastIndexInSet;
+    this._drawLine(ctx, i);
   }
-
-  context.restore();
 };
 
 /**