unexposed verticalPadding

(cherry picked from commit e9b4d9d)

Author: monfera

src/traces/parcoords/attributes.js

@@ -188,15 +188,6 @@ module.exports = {
             description: [
                 'By default, the rendered lines are opaque. Setting it to `true` is necessary if opacity is needed.'
             ].join(' ')
-        },
-
-        verticalpadding: {
-            valType: 'number',
-            dflt: 2,
-            min: 0,
-            max: 4,
-            role: 'style',
-            description: 'Lines have thickness, and without padding, horizontal lines at extreme values appear thinner.'
         }
     }
 };

src/traces/parcoords/defaults.js

@@ -89,5 +89,4 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
     coerce('lines.contextopacity');
     coerce('lines.pixelratio');
     coerce('lines.focusalphablending');
-    coerce('lines.verticalpadding');
 };

src/traces/parcoords/parcoords.js

@@ -15,6 +15,7 @@ var d3 = require('d3');
 var overdrag = 40;
 var legendWidth = 80;
 var integerPadding = 0;
+var verticalPadding = 2; // otherwise, horizontal lines on top or bottom are of lower width
 
 var filterBar = {
     width: 4, // Visible width of the filter bar
@@ -134,7 +135,7 @@ function viewModel(model) {
 
     var xScale = d3.scale.ordinal().domain(d3.range(dimensions.filter(visible).length)).rangePoints([0, width], 0);
 
-    var unitPad = lines.verticalpadding / (height * canvasPixelRatio);
+    var unitPad = verticalPadding / (height * canvasPixelRatio);
     var unitPadScale = (1 - 2 * unitPad);
     var paddedUnitScale = function(d) {return unitPad + unitPadScale * d;};
 
@@ -159,8 +160,8 @@ function viewModel(model) {
             xScale: xScale,
             x: xScale(i),
             canvasX: xScale(i) * canvasPixelRatio,
-            unitScale: unitScale(height, lines.verticalpadding),
-            domainScale: domainScale(height, lines.verticalpadding, integerPadding, dimension),
+            unitScale: unitScale(height, verticalPadding),
+            domainScale: domainScale(height, verticalPadding, integerPadding, dimension),
             integerScale: integerScale(lines.integerpadding, dimension),
             domainToUnitScale: domainToUnit,
             pieChartCheat: dimension.pieChartCheat,