From f3cf915f1c43f026deeac6cc78a175aad22aafba Mon Sep 17 00:00:00 2001
From: Davis Ford <davisford@zenoconsulting.biz>
Date: Fri, 17 Oct 2014 22:42:28 -0400
Subject: [PATCH] add new boolean property on line chart to enable/disable
 mouseover for xy axis refs and data points

---
 spec/line-chart-spec.js | 14 ++++++++++++++
 src/line-chart.js       | 17 ++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/spec/line-chart-spec.js b/spec/line-chart-spec.js
index d159bbe08..b414ffe91 100644
--- a/spec/line-chart-spec.js
+++ b/spec/line-chart-spec.js
@@ -122,6 +122,20 @@ describe('dc.lineChart', function() {
             });
         });
 
+        describe('data point highlights and refs off', function () {
+            beforeEach(function () {
+                chart.title(function (d) { return d.value; });
+                chart.brushOn(false).xyTipsOn(false).render();
+            });
+            it('should not generate per data points', function () {
+                expect(chart.selectAll('circle.dot').size())toBe(0);
+            });
+            it('should not generate x and y refs', function () {
+                expect(chart.selectAll('path.xRef').size()).toBe(0);
+                expect(chart.selectAll('path.yRef').size()).toBe(0);
+            });
+        });
+
         describe('data point highlights', function () {
             beforeEach(function () {
                 chart.title(function (d) { return d.value; });
diff --git a/src/line-chart.js b/src/line-chart.js
index 96b36a7bc..568bb72ee 100644
--- a/src/line-chart.js
+++ b/src/line-chart.js
@@ -52,6 +52,7 @@ dc.lineChart = function (parent, chartGroup) {
     var _tension = 0.7;
     var _defined;
     var _dashStyle;
+    var _xyTipsOn = true;
 
     _chart.transitionDuration(500);
     _chart._rangeBandPadding(1);
@@ -233,7 +234,7 @@ dc.lineChart = function (parent, chartGroup) {
     }
 
     function drawDots(chartBody, layers) {
-        if (!_chart.brushOn()) {
+        if (!_chart.brushOn() && _chart.xyTipsOn()) {
             var tooltipListClass = TOOLTIP_G_CLASS + '-list';
             var tooltips = chartBody.select('g.' + tooltipListClass);
 
@@ -338,6 +339,20 @@ dc.lineChart = function (parent, chartGroup) {
         }
     }
 
+    /**
+     #### .xyTipsOn([boolean])
+     Turn on/off the mouseover behavior of an individual data point which renders a circle and x/y axis
+     dashed lines back to each respective axis.  This is ignored if the chart brush is on (`brushOn`)
+     Default: true
+     */
+    _chart.xyTipsOn = function (_) {
+        if (!arguments.length) {
+            return _xyTipsOn;
+        }
+        _xyTipsOn = _;
+        return _chart;
+    };
+
     /**
     #### .dotRadius([dotRadius])
     Get or set the radius (in px) for dots displayed on the data points. Default dot radius is 5.