Fix for issue with log scale and toDataYCoord.

This is a fix for issue 454:
https://code.google.com/p/dygraphs/issues/detail?id=454

Squashed commit of the following:

commit 795eaa7bb3fcf65ae13c861dd8c034583009516e
Author: craigj <craig.jackson@douglasscientific.com>
Date:   Thu Aug 29 07:21:56 2013 -0500

    Adding back in comment that explains calculation that was removed in a previous commit.

commit fc837121be749eefc41c2af0f5b376dd593bedb6
Author: craigj <craig.jackson@douglasscientific.com>
Date:   Tue Aug 27 13:54:27 2013 -0500

    Adding test testChartLogarithmic to auto_test.

commit 3e1f6af6a79517fce4b88d59def0d05e4ac90920
Author: craigj <craig.jackson@douglasscientific.com>
Date:   Tue Aug 13 14:19:09 2013 -0500

    ISSUE-454:  Fixing issue with log scale and toDataYCoord per issue 454.  https://code.google.com/p/dygraphs/issues/detail?id=454

commit 7ea65b58b912714594f5f9382464167f34dfd03a
Author: craigj <craig.jackson@douglasscientific.com>
Date:   Tue Aug 13 14:16:59 2013 -0500

    ISSUE-454:  Fixing issue with log scale and toDataYCoord per issue 454.  https://code.google.com/p/dygraphs/issues/detail?id=454

commit d509655be656940deaec9a06cdab35c451e708d5
Author: craigj <craig.jackson@douglasscientific.com>
Date:   Tue Aug 13 14:11:35 2013 -0500

    ISSUE-454:  Fixing issue with log scale and toDataYCoord per issue 454.  https://code.google.com/p/dygraphs/issues/detail?id=454

diff --git a/auto_tests/tests/to_dom_coords.js b/auto_tests/tests/to_dom_coords.js
index dae4f44..5da5869 100644 (file)
--- a/auto_tests/tests/to_dom_coords.js
+++ b/auto_tests/tests/to_dom_coords.js
@@ -165,3 +165,32 @@ ToDomCoordsTestCase.prototype.testAxisTickSize = function() {
   assertEquals([200, 0], g.toDomCoords(0, 100));
   assertEquals([500, 386], g.toDomCoords(100, 0));
 }
+
+ToDomCoordsTestCase.prototype.testChartLogarithmic = function() {
+  var opts = {
+    drawXAxis: false,
+    drawYAxis: false,
+    drawXGrid: false,
+    drawYGrid: false,
+    logscale: true,
+    rightGap: 0,
+    valueRange: [10, 100],
+    dateWindow: [10, 100],
+    width: 400,
+    height: 400,
+    colors: ['#ff0000']
+  }
+
+  var graph = document.getElementById("graph");
+  g = new Dygraph(graph, [ [10,10], [100,100] ], opts);
+
+  assertEquals([10, 100], g.toDataCoords(0, 0));
+  assertEquals([10, 10], g.toDataCoords(0, 400));
+  assertEquals([100, 100], g.toDataCoords(400, 0));
+  assertEquals([100, 10], g.toDataCoords(400, 400));
+  
+  assertEquals([0, 0], g.toDomCoords(10, 100));
+  assertEquals([0, 400], g.toDomCoords(10, 10));
+  assertEquals([400, 0], g.toDomCoords(100, 100));
+  assertEquals([400, 400], g.toDomCoords(100, 10));
+}

diff --git a/dygraph.js b/dygraph.js
index b9f08dc..1d33570 100644 (file)
--- a/dygraph.js
+++ b/dygraph.js
@@ -857,7 +857,7 @@ Dygraph.prototype.toDataYCoord = function(y, axis) {
   var yRange = this.yAxisRange(axis);
 
   if (typeof(axis) == "undefined") axis = 0;
-  if (!this.axes_[axis].logscale) {
+  if (!this.attributes_.getForAxis("logscale", axis)) {
     return yRange[0] + (area.y + area.h - y) / area.h * (yRange[1] - yRange[0]);
   } else {
     // Computing the inverse of toDomCoord.