update All Rights Reserved string

[dygraphs.git] / dygraph-layout.js

diff --git a/dygraph-layout.js b/dygraph-layout.js
index 99ae50c..8829b6c 100644 (file)
--- a/dygraph-layout.js
+++ b/dygraph-layout.js
@@ -1,5 +1,5 @@
 // Copyright 2011 Dan Vanderkam (danvdk@gmail.com)
-// All Rights Reserved.
+// MIT-licensed (http://opensource.org/licenses/MIT)
 
 /**
  * @fileoverview Based on PlotKitLayout, but modified to meet the needs of
@@ -126,35 +126,53 @@ DygraphLayout.prototype._evaluateLimits = function() {
   }
 };
 
+DygraphLayout._calcYNormal = function(axis, value) {
+  if (axis.logscale) {
+    return 1.0 - ((Dygraph.log10(value) - Dygraph.log10(axis.minyval)) * axis.ylogscale);
+  } else {
+    return 1.0 - ((value - axis.minyval) * axis.yscale);
+  }
+};
+
 DygraphLayout.prototype._evaluateLineCharts = function() {
   // add all the rects
   this.points = new Array();
+  // An array to keep track of how many points will be drawn for each set.
+  // This will allow for the canvas renderer to not have to check every point
+  // for every data set since the points are added in order of the sets in
+  // datasets.
+  this.setPointsLengths = new Array();
+
   for (var setName in this.datasets) {
     if (!this.datasets.hasOwnProperty(setName)) continue;
 
     var dataset = this.datasets[setName];
     var axis = this.dygraph_.axisPropertiesForSeries(setName);
 
+    var setPointsLength = 0;
+
     for (var j = 0; j < dataset.length; j++) {
       var item = dataset[j];
+      var xValue = parseFloat(dataset[j][0]);
+      var yValue = parseFloat(dataset[j][1]);
+
+      // Range from 0-1 where 0 represents left and 1 represents right.
+      var xNormal = (xValue - this.minxval) * this.xscale;
+      // Range from 0-1 where 0 represents top and 1 represents bottom
+      var yNormal = DygraphLayout._calcYNormal(axis, yValue);
 
-      var yval;
-      if (axis.logscale) {
-        yval = 1.0 - ((Dygraph.log10(parseFloat(item[1])) - Dygraph.log10(axis.minyval)) * axis.ylogscale); // really should just be yscale.
-      } else {
-        yval = 1.0 - ((parseFloat(item[1]) - axis.minyval) * axis.yscale);
-      }
       var point = {
         // TODO(danvk): here
-        x: ((parseFloat(item[0]) - this.minxval) * this.xscale),
-        y: yval,
-        xval: parseFloat(item[0]),
-        yval: parseFloat(item[1]),
+        x: xNormal,
+        y: yNormal,
+        xval: xValue,
+        yval: yValue,
         name: setName
       };
-
       this.points.push(point);
+      setPointsLength += 1;
     }
+    this.setPointsLengths.push(setPointsLength);
   }
 };
 
@@ -198,6 +216,7 @@ DygraphLayout.prototype.evaluateWithError = function() {
     if (!this.datasets.hasOwnProperty(setName)) continue;
     var j = 0;
     var dataset = this.datasets[setName];
+    var axis = this.dygraph_.axisPropertiesForSeries(setName);
     for (var j = 0; j < dataset.length; j++, i++) {
       var item = dataset[j];
       var xv = parseFloat(item[0]);
@@ -205,8 +224,13 @@ DygraphLayout.prototype.evaluateWithError = function() {
 
       if (xv == this.points[i].xval &&
           yv == this.points[i].yval) {
-        this.points[i].errorMinus = parseFloat(item[2]);
-        this.points[i].errorPlus = parseFloat(item[3]);
+        var errorMinus = parseFloat(item[2]);
+        var errorPlus = parseFloat(item[3]);
+
+        var yv_minus = yv - errorMinus;
+        var yv_plus = yv + errorPlus;
+        this.points[i].y_top = DygraphLayout._calcYNormal(axis, yv_minus);
+        this.points[i].y_bottom = DygraphLayout._calcYNormal(axis, yv_plus);
       }
     }
   }