Make hasCategory method

dy · dy · commit 7ed4484dd6ca · 2017-09-07T15:13:17.000-04:00
diff --git a/src/plots/plots.js b/src/plots/plots.js
@@ -458,6 +458,7 @@ plots.supplyDefaults = function(gd) {
 
     // attach helper method to check whether a plot type is present on graph
     newFullLayout._has = plots._hasPlotType.bind(newFullLayout);
+    newFullLayout._hasCategory = plots._hasCategory.bind(newFullLayout);
 
     // special cases that introduce interactions between traces
     var _modules = newFullLayout._modules;
@@ -576,6 +577,21 @@ plots._hasPlotType = function(category) {
     return false;
 };
 
+// check whether trace has a category
+plots._hasCategory = function(category) {
+    var modules = this._modules || [];
+
+    // create canvases only in case if there is at least one regl component
+    for(var i = 0; i < modules.length; i++) {
+        var _ = modules[i];
+        if(_.categories && _.categories.indexOf(category) >= 0) {
+            return true;
+        }
+    }
+
+    return false;
+};
+
 plots.cleanPlot = function(newFullData, newFullLayout, oldFullData, oldFullLayout) {
     var i, j;
 
