X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-canvas.js;h=de8d4fe573142a7f4833df64c6b980a38920a6ab;hb=e11c15fd04a8848a1fe695bfb1892571ff06deb5;hp=3c1d40c0fc7ea9ce2139a0b635e48ab67c815fe9;hpb=e26b71566419e1c051f3fbd1f4f8f64b063a04c9;p=dygraphs.git

diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index 3c1d40c..de8d4fe 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -383,9 +383,17 @@ DygraphCanvasRenderer.prototype._renderAxis = function() {
     }
 
     // draw a vertical line on the left to separate the chart from the labels.
+    var axisX;
+    if (this.attr_('drawAxesAtZero')) {
+      var r = this.dygraph_.toPercentXCoord(0);
+      if (r > 1 || r < 0) r = 0;
+      axisX = halfUp(this.area.x + r * this.area.w);
+    } else {
+      axisX = halfUp(this.area.x);
+    }
     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.moveTo(axisX, halfDown(this.area.y));
+    context.lineTo(axisX, halfDown(this.area.y + this.area.h));
     context.closePath();
     context.stroke();
 
@@ -436,8 +444,16 @@ DygraphCanvasRenderer.prototype._renderAxis = function() {
     }
 
     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));
+    var axisY;
+    if (this.attr_('drawAxesAtZero')) {
+      var r = this.dygraph_.toPercentYCoord(0, 0);
+      if (r > 1 || r < 0) r = 1;
+      axisY = halfDown(this.area.y + r * this.area.h);
+    } else {
+      axisY = halfDown(this.area.y + this.area.h);
+    }
+    context.moveTo(halfUp(this.area.x), axisY);
+    context.lineTo(halfUp(this.area.x + this.area.w), axisY);
     context.closePath();
     context.stroke();
   }
@@ -634,13 +650,13 @@ DygraphCanvasRenderer.prototype._renderAnnotations = function() {
     div.style.borderColor = this.colors[p.name];
     a.div = div;
 
-    Dygraph.addEvent(div, 'click',
+    this.dygraph_.addEvent(div, 'click',
         bindEvt('clickHandler', 'annotationClickHandler', p, this));
-    Dygraph.addEvent(div, 'mouseover',
+    this.dygraph_.addEvent(div, 'mouseover',
         bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this));
-    Dygraph.addEvent(div, 'mouseout',
+    this.dygraph_.addEvent(div, 'mouseout',
         bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this));
-    Dygraph.addEvent(div, 'dblclick',
+    this.dygraph_.addEvent(div, 'dblclick',
         bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this));
 
     this.container.appendChild(div);
@@ -661,11 +677,12 @@ DygraphCanvasRenderer.prototype._renderAnnotations = function() {
   }
 };
 
-DygraphCanvasRenderer.makeNextPointStep_ = function(connect, points, end) {
+DygraphCanvasRenderer.makeNextPointStep_ = function(
+    connect, points, start, end) {
   if (connect) {
     return function(j) {
-      while (++j < end) {
-        if (!(points[j].yval === null)) break;
+      while (++j + start < end) {
+        if (!(points[start + j].yval === null)) break;
       }
       return j;
     }
@@ -674,32 +691,47 @@ DygraphCanvasRenderer.makeNextPointStep_ = function(connect, points, end) {
   }
 };
 
+DygraphCanvasRenderer.isNullOrNaN_ = function(x) {
+  return (x === null || isNaN(x));
+};
+
 DygraphCanvasRenderer.prototype._drawStyledLine = function(
     ctx, i, setName, color, strokeWidth, strokePattern, drawPoints,
     drawPointCallback, pointSize) {
-  var isNullOrNaN = function(x) {
-    return (x === null || isNaN(x));
-  };
-
+  // 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 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 drawGapPoints = this.dygraph_.attr_('drawGapEdgePoints', setName);
 
-  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 (strokeWidth && !stepPlot && (!strokePattern || strokePattern.length <= 1)) {
+    this._drawTrivialLine(ctx, points, setLength, firstIndexInSet, setName, color, strokeWidth, drawPointCallback, pointSize, drawPoints, drawGapPoints);
+  } else {
+    this._drawNonTrivialLine(ctx, points, setLength, firstIndexInSet, setName, color, strokeWidth, strokePattern, drawPointCallback, pointSize, drawPoints, drawGapPoints, stepPlot);
+  }
+  ctx.restore();
+};
+
+DygraphCanvasRenderer.prototype._drawNonTrivialLine = function(
+    ctx, points, setLength, firstIndexInSet, setName, color, strokeWidth, strokePattern, drawPointCallback, pointSize, drawPoints, drawGapPoints, stepPlot) {
+  var prevX = null;
+  var prevY = null;
+  var nextY = null;
+  var point, nextPoint;
+  var pointsOnLine = []; // Array of [canvasx, canvasy] pairs.
+  var next = DygraphCanvasRenderer.makeNextPointStep_(
+      this.attr_('connectSeparatedPoints'), points, firstIndexInSet,
+      firstIndexInSet + setLength);
+  for (var j = 0; j < setLength; j = next(j)) {
+    point = points[firstIndexInSet + j];
+    nextY = (next(j) < setLength) ?
+        points[firstIndexInSet + next(j)].canvasy : null;
+    if (DygraphCanvasRenderer.isNullOrNaN_(point.canvasy)) {
       if (stepPlot && prevX !== null) {
         // Draw a horizontal line to the start of the missing data
         ctx.beginPath();
@@ -713,8 +745,15 @@ DygraphCanvasRenderer.prototype._drawStyledLine = function(
     } 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)));
+      var isIsolated = (!prevX && DygraphCanvasRenderer.isNullOrNaN_(nextY));
+      if (drawGapPoints) {
+        // Also consider a point to be is "isolated" if it's adjacent to a
+        // null point, excluding the graph edges.
+        if ((j > 0 && !prevX) ||
+            (next(j) < setLength && DygraphCanvasRenderer.isNullOrNaN_(nextY))) {
+          isIsolated = true;
+        }
+      }
       if (prevX === null) {
         prevX = point.canvasx;
         prevY = point.canvasy;
@@ -754,7 +793,54 @@ DygraphCanvasRenderer.prototype._drawStyledLine = function(
         this.dygraph_, setName, ctx, cb[0], cb[1], color, pointSize);
     ctx.restore();
   }
-  ctx.restore();
+};
+
+DygraphCanvasRenderer.prototype._drawTrivialLine = function(
+    ctx, points, setLength, firstIndexInSet, setName, color, strokeWidth, drawPointCallback, pointSize, drawPoints, drawGapPoints) {
+  var prevX = null;
+  var prevY = null;
+  var nextY = null;
+  var pointsOnLine = []; // Array of [canvasx, canvasy] pairs.
+  ctx.beginPath();
+  ctx.strokeStyle = color;
+  ctx.lineWidth = strokeWidth;
+  for (var j = firstIndexInSet; j < firstIndexInSet + setLength; ++j) {
+    var point = points[j];
+    nextY = (j + 1 < firstIndexInSet + setLength) ? points[j + 1].canvasy : null;
+    if (DygraphCanvasRenderer.isNullOrNaN_(point.canvasy)) {
+      prevX = prevY = null;
+    } else {
+      var isIsolated = (!prevX && DygraphCanvasRenderer.isNullOrNaN_(nextY));
+      if (drawGapPoints) {
+        // Also consider a point to be is "isolated" if it's adjacent to a
+        // null point, excluding the graph edges.
+        if ((j > firstIndexInSet && !prevX) ||
+            ((j + 1 < firstIndexInSet + setLength) && DygraphCanvasRenderer.isNullOrNaN_(nextY))) {
+          isIsolated = true;
+        }
+      }
+      if (prevX === null) {
+        prevX = point.canvasx;
+        prevY = point.canvasy;
+        if (j === firstIndexInSet) {
+          ctx.moveTo(point.canvasx, point.canvasy);
+        }
+      } else {
+        ctx.lineTo(point.canvasx, point.canvasy);
+      }
+      if (drawPoints || isIsolated) {
+        pointsOnLine.push([point.canvasx, point.canvasy]);
+      }
+    }
+  }
+  ctx.stroke();
+  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._drawLine = function(ctx, i) {
@@ -765,6 +851,8 @@ DygraphCanvasRenderer.prototype._drawLine = function(ctx, i) {
   var borderWidth = this.dygraph_.attr_("strokeBorderWidth", setName);
   var drawPointCallback = this.dygraph_.attr_("drawPointCallback", setName) ||
       Dygraph.Circles.DEFAULT;
+
+  // TODO(konigsberg): Turn this into one call, and then consider inlining drawStyledLine.
   if (borderWidth && strokeWidth) {
     this._drawStyledLine(ctx, i, setName,
         this.dygraph_.attr_("strokeBorderColor", setName),
@@ -812,6 +900,10 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
 
   // 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;
@@ -890,7 +982,8 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
     ctx.restore();
   } else if (fillGraph) {
     ctx.save();
-    var baseline = [];  // for stacked graphs: baseline for filling
+    var baseline = {};  // for stacked graphs: baseline for filling
+    var currBaseline;
 
     // process sets in reverse order (needed for stacked graphs)
     for (i = setCount - 1; i >= 0; i--) {
@@ -927,21 +1020,50 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
             continue;
           }
           if (stackedGraph) {
-            var lastY = baseline[point.canvasx];
-            if (lastY === undefined) lastY = axisY;
-            baseline[point.canvasx] = point.canvasy;
+            currBaseline = baseline[point.canvasx];
+            var lastY;
+            if (currBaseline === undefined) {
+              lastY = axisY;
+            } else {
+              if(stepPlot) {
+                lastY = currBaseline[0];
+              } else {
+                lastY = currBaseline;
+              }
+            }
             newYs = [ point.canvasy, lastY ];
+
+            if(stepPlot) {
+              // Step plots must keep track of the top and bottom of
+              // the baseline at each point.
+              if(prevYs[0] === -1) {
+                baseline[point.canvasx] = [ point.canvasy, axisY ];
+              } else {
+                baseline[point.canvasx] = [ point.canvasy, prevYs[0] ];
+              }
+            } 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) {
+                // 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]);
+              ctx.lineTo(point.canvasx, newYs[1]);
             }
-            ctx.lineTo(point.canvasx, newYs[1]);
+
             ctx.lineTo(prevX, prevYs[1]);
             ctx.closePath();
           }