hook in 'maxLength' as 'maxdisplayed'

- I found gl-streamtube3d's maxLength similar enough to scatter traces'
  'marker.maxdisplayed' to use same same attribute name.

Author: etpinard

src/traces/streamtube/attributes.js

@@ -77,6 +77,17 @@ var attrs = {
         ].join(' ')
     },
 
+    maxdisplayed: {
+        valType: 'integer',
+        min: 0,
+        dflt: 1000,
+        role: 'info',
+        editType: 'calc',
+        description: [
+            'The maximum number of displayed segments in a streamtube.'
+        ].join(' ')
+    },
+
     // TODO
     //
     // Should add 'absolute' (like cone traces have), but currently gl-streamtube3d's
@@ -95,7 +106,6 @@ var attrs = {
     //         'Sets the mode by which the streamtubes are sized.'
     //     ].join(' ')
     // },
-    // maxLength
 
     sizeref: {
         valType: 'number',

src/traces/streamtube/convert.js

@@ -145,11 +145,8 @@ function convert(scene, trace) {
     }
 
     tubeOpts.colormap = parseColorScale(trace.colorscale);
-
-    // TODO
-    // tubeOpts.maxLength
-
     tubeOpts.tubeSize = trace.sizeref;
+    tubeOpts.maxLength = trace.maxdisplayed;
 
     // add some padding around the bounds
     // to e.g. allow tubes starting from a slice of the x/y/z mesh

src/traces/streamtube/defaults.js

@@ -38,9 +38,7 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
     coerce('starty');
     coerce('startz');
 
-    // TODO adapt these
-    // coerce('maxLength');
-
+    coerce('maxdisplayed');
     coerce('sizeref');
 
     coerce('lighting.ambient');

test/image/baselines/gl3d_streamtube-wind.png

@@ -129218,15 +129218,16 @@
         15,
         15
       ],
-      "sizeref": 0.6,
+      "sizeref": 0.3,
       "colorscale": "Portland",
-      "showscale": false
+      "showscale": false,
+      "maxdisplayed": 3000
     }
   ],
   "layout": {
     "scene": {
       "aspectratio": {
-        "x": 1,
+        "x": 2,
         "y": 1,
         "z": 0.3
       }