Make surface contour levels configurable

src/traces/isosurface/attributes.js

@@ -34,7 +34,7 @@ function makeSliceAttr(axLetter) {
             role: 'info',
             description: [
                 'Specifies the location(s) of slices on the axis.',
-                'When not locations specified slices would be created for',
+                'When not specified slices would be created for',
                 'all points of the axis', axLetter, 'except start and end.'
             ].join(' ')
         },

src/traces/surface/attributes.js

@@ -44,6 +44,40 @@ function makeContourAttr(axLetter) {
                 'dimension are drawn.'
             ].join(' ')
         },
+        start: {
+            valType: 'number',
+            dflt: null,
+            role: 'style',
+            editType: 'plot',
+         // impliedEdits: {'^autocontour': false},
+            description: [
+                'Sets the starting contour level value.',
+                'Must be less than `contours.end`'
+            ].join(' ')
+        },
+        end: {
+            valType: 'number',
+            dflt: null,
+            role: 'style',
+            editType: 'plot',
+         // impliedEdits: {'^autocontour': false},
+            description: [
+                'Sets the end contour level value.',
+                'Must be more than `contours.start`'
+            ].join(' ')
+        },
+        size: {
+            valType: 'number',
+            dflt: null,
+            min: 0,
+            role: 'style',
+            editType: 'plot',
+         // impliedEdits: {'^autocontour': false},
+            description: [
+                'Sets the step between each contour level.',
+                'Must be positive.'
+            ].join(' ')
+        },
         project: {
             x: makeContourProjAttr('x'),
             y: makeContourProjAttr('y'),

src/traces/surface/convert.js

@@ -28,12 +28,15 @@ function SurfaceTrace(scene, surface, uid) {
     this.surface = surface;
     this.data = null;
     this.showContour = [false, false, false];
+    this.contourStart = [null, null, null];
+    this.contourEnd = [null, null, null];
+    this.contourSize = [0, 0, 0];
     this.minValues = [Infinity, Infinity, Infinity];
     this.maxValues = [-Infinity, -Infinity, -Infinity];
     this.dataScaleX = 1.0;
     this.dataScaleY = 1.0;
     this.refineData = true;
-    this._interpolatedZ = false;
+    this.objectOffset = [0, 0, 0];
 }
 
 var proto = SurfaceTrace.prototype;
@@ -349,19 +352,54 @@ proto.refineCoords = function(coords) {
     }
 };
 
+function insertIfNewLevel(arr, newValue) {
+    var found = false;
+    for(var k = 0; k < arr.length; k++) {
+        if(newValue === arr[k]) {
+            found = true;
+            break;
+        }
+    }
+    if(found === false) arr.push(newValue);
+}
+
 proto.setContourLevels = function() {
-    var nlevels = [[], [], []];
+    var newLevels = [[], [], []];
+    var useNewLevels = [false, false, false];
     var needsUpdate = false;
 
-    for(var i = 0; i < 3; ++i) {
+    var i, j, value;
+
+    for(i = 0; i < 3; ++i) {
         if(this.showContour[i]) {
             needsUpdate = true;
-            nlevels[i] = this.scene.contourLevels[i];
+
+            if(
+                this.contourSize[i] > 0 &&
+                this.contourStart[i] !== null &&
+                this.contourEnd[i] !== null &&
+                this.contourEnd[i] > this.contourStart[i]
+            ) {
+                useNewLevels[i] = true;
+
+                for(j = this.contourStart[i]; j < this.contourEnd[i]; j += this.contourSize[i]) {
+                    value = j * this.scene.dataScale[i];
+
+                    insertIfNewLevel(newLevels[i], value);
+                }
+            }
+
         }
     }
 
     if(needsUpdate) {
-        this.surface.update({ levels: nlevels });
+        var allLevels = [[], [], []];
+        for(i = 0; i < 3; ++i) {
+            if(this.showContour[i]) {
+                allLevels[i] = useNewLevels[i] ? newLevels[i] : this.scene.contourLevels[i];
+            }
+        }
+        this.surface.update({ levels: allLevels });
     }
 };
 
@@ -456,15 +494,15 @@ proto.update = function(data) {
     }
 
     for(i = 0; i < 3; i++) {
-        data._objectOffset[i] = 0.5 * (this.minValues[i] + this.maxValues[i]);
+        this.objectOffset[i] = 0.5 * (this.minValues[i] + this.maxValues[i]);
     }
 
     for(i = 0; i < 3; i++) {
         for(j = 0; j < xlen; j++) {
             for(k = 0; k < ylen; k++) {
                 v = rawCoords[i][j][k];
                 if(v !== null && v !== undefined) {
-                    rawCoords[i][j][k] -= data._objectOffset[i];
+                    rawCoords[i][j][k] -= this.objectOffset[i];
                 }
             }
         }
@@ -564,8 +602,16 @@ proto.update = function(data) {
                 surface.highlightTint[i] = params.contourTint[i] = 1;
             }
             params.contourWidth[i] = contourParams.width;
+
+            this.contourStart[i] = contourParams.start;
+            this.contourEnd[i] = contourParams.end;
+            this.contourSize[i] = contourParams.size;
         } else {
             this.showContour[i] = false;
+
+            this.contourStart[i] = null;
+            this.contourEnd[i] = null;
+            this.contourSize[i] = 0;
         }
 
         if(contourParams.highlight) {
@@ -579,11 +625,7 @@ proto.update = function(data) {
         params.vertexColor = true;
     }
 
-    params.objectOffset = [
-        data._objectOffset[0],
-        data._objectOffset[1],
-        data._objectOffset[2]
-    ];
+    params.objectOffset = this.objectOffset;
 
     params.coords = coords;
     surface.update(params);

src/traces/surface/defaults.js

@@ -36,8 +36,6 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
     traceOut._xlength = (Array.isArray(x) && Lib.isArrayOrTypedArray(x[0])) ? z.length : z[0].length;
     traceOut._ylength = z.length;
 
-    traceOut._objectOffset = [0, 0, 0];
-
     var handleCalendarDefaults = Registry.getComponentMethod('calendars', 'handleTraceDefaults');
     handleCalendarDefaults(traceIn, traceOut, ['x', 'y', 'z'], layout);
 
@@ -85,6 +83,10 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
             coerce(contourDim + '.highlightcolor');
             coerce(contourDim + '.highlightwidth');
         }
+
+        coerce(contourDim + '.start');
+        coerce(contourDim + '.end');
+        coerce(contourDim + '.size');
     }
 
     // backward compatibility block