Constraint-type contours for regular contour (not on a carpet)

src/components/legend/helpers.js

@@ -9,11 +9,14 @@
 
 'use strict';
 
-var Registry = require('../../registry');
-
-
 exports.legendGetsTrace = function legendGetsTrace(trace) {
-    return trace.visible && Registry.traceIs(trace, 'showLegend');
+    // traceIs(trace, 'showLegend') is not sufficient anymore, due to contour(carpet)?
+    // which are legend-eligible only if type: constraint. Otherwise, showlegend gets deleted.
+
+    // Note that we explicitly include showlegend: false, so a trace that *could* be
+    // in the legend but is not shown still counts toward the two traces you need to
+    // ensure the legend is shown by default, because this can still help disambiguate.
+    return trace.visible && (trace.showlegend !== undefined);
 };
 
 exports.isGrouped = function isGrouped(legendLayout) {

src/components/legend/style.js

@@ -60,13 +60,14 @@ module.exports = function style(s, gd) {
     .each(stylePoints);
 
     function styleLines(d) {
-        var trace = d[0].trace,
-            showFill = trace.visible && trace.fill && trace.fill !== 'none',
-            showLine = subTypes.hasLines(trace);
-
-        if(trace && trace._module && trace._module.name === 'contourcarpet') {
-            showLine = trace.contours.showlines;
-            showFill = trace.contours.coloring === 'fill';
+        var trace = d[0].trace;
+        var showFill = trace.visible && trace.fill && trace.fill !== 'none';
+        var showLine = subTypes.hasLines(trace);
+        var contours = trace.contours;
+
+        if(contours && contours.type === 'constraint') {
+            showLine = contours.showlines;
+            showFill = contours._operation !== '=';
         }
 
         var fill = d3.select(this).select('.legendfill').selectAll('path')

src/constants/filter_ops.js

@@ -0,0 +1,36 @@
+/**
+* Copyright 2012-2018, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+'use strict';
+
+module.exports = {
+    COMPARISON_OPS: ['=', '!=', '<', '>=', '>', '<='],
+    COMPARISON_OPS2: ['=', '<', '>=', '>', '<='],
+    INTERVAL_OPS: ['[]', '()', '[)', '(]', '][', ')(', '](', ')['],
+    SET_OPS: ['{}', '}{'],
+    CONSTRAINT_REDUCTION: {
+        // for contour constraints, open/closed endpoints are equivalent
+        '=': '=',
+
+        '<': '<',
+        '<=': '<',
+
+        '>': '>',
+        '>=': '>',
+
+        '[]': '[]',
+        '()': '[]',
+        '[)': '[]',
+        '(]': '[]',
+
+        '][': '][',
+        ')(': '][',
+        '](': '][',
+        ')[': ']['
+    }
+};

src/traces/contour/attributes.js

@@ -16,6 +16,10 @@ var dash = require('../../components/drawing/attributes').dash;
 var fontAttrs = require('../../plots/font_attributes');
 var extendFlat = require('../../lib/extend').extendFlat;
 
+var filterOps = require('../../constants/filter_ops');
+var COMPARISON_OPS2 = filterOps.COMPARISON_OPS2;
+var INTERVAL_OPS = filterOps.INTERVAL_OPS;
+
 var scatterLineAttrs = scatterAttrs.line;
 
 module.exports = extendFlat({
@@ -34,6 +38,17 @@ module.exports = extendFlat({
 
     connectgaps: heatmapAttrs.connectgaps,
 
+    fillcolor: {
+        valType: 'color',
+        role: 'style',
+        editType: 'calc',
+        description: [
+            'Sets the fill color if `contours.type` is *constraint*.',
+            'Defaults to a half-transparent variant of the line color,',
+            'marker color, or marker line color, whichever is available.'
+        ].join(' ')
+    },
+
     autocontour: {
         valType: 'boolean',
         dflt: true,
@@ -67,6 +82,19 @@ module.exports = extendFlat({
     },
 
     contours: {
+        type: {
+            valType: 'enumerated',
+            values: ['levels', 'constraint'],
+            dflt: 'levels',
+            role: 'info',
+            editType: 'calc',
+            description: [
+                'If `levels`, the data is represented as a contour plot with multiple',
+                'levels displayed. If `constraint`, the data is represented as constraints',
+                'with the invalid region shaded as specified by the `operation` and',
+                '`value` parameters.'
+            ].join(' ')
+        },
         start: {
             valType: 'number',
             dflt: null,
@@ -155,6 +183,53 @@ module.exports = extendFlat({
                 'https://github.com/d3/d3-format/blob/master/README.md#locale_format.'
             ].join(' ')
         },
+        operation: {
+            valType: 'enumerated',
+            values: [].concat(COMPARISON_OPS2).concat(INTERVAL_OPS),
+            role: 'info',
+            dflt: '=',
+            editType: 'calc',
+            description: [
+                'Sets the filter operation.',
+
+                '*=* keeps items equal to `value`',
+
+                '*<* and *<=* keep items less than `value`',
+
+                '*>* and *>=* keep items greater than `value`',
+
+                '*[]*, *()*, *[)*, and *(]* keep items inside `value[0]` to `value[1]`',
+
+                '*][*, *)(*, *](*, *)[* keep items outside `value[0]` to value[1]`',
+
+                'Open vs. closed intervals make no difference to constraint display, but',
+                'all versions are allowed for consistency with filter transforms.'
+            ].join(' ')
+        },
+        value: {
+            valType: 'any',
+            dflt: 0,
+            role: 'info',
+            editType: 'calc',
+            description: [
+                'Sets the value or values by which to filter by.',
+
+                'Values are expected to be in the same type as the data linked',
+                'to *target*.',
+
+                'When `operation` is set to one of the comparison values',
+                '(' + COMPARISON_OPS2 + ')',
+                '*value* is expected to be a number or a string.',
+
+                'When `operation` is set to one of the interval value',
+                '(' + INTERVAL_OPS + ')',
+                '*value* is expected to be 2-item array where the first item',
+                'is the lower bound and the second item is the upper bound.',
+
+                'Open vs. closed intervals make no difference to constraint display, but',
+                'all versions are allowed for consistency with filter transforms.'
+            ].join(' ')
+        },
         editType: 'calc',
         impliedEdits: {'autocontour': false}
     },

src/traces/contour/calc.js

@@ -9,94 +9,14 @@
 
 'use strict';
 
-var Axes = require('../../plots/cartesian/axes');
-var extendFlat = require('../../lib').extendFlat;
 var heatmapCalc = require('../heatmap/calc');
-
+var setContours = require('./set_contours');
 
 // most is the same as heatmap calc, then adjust it
 // though a few things inside heatmap calc still look for
 // contour maps, because the makeBoundArray calls are too entangled
 module.exports = function calc(gd, trace) {
-    var cd = heatmapCalc(gd, trace),
-        contours = trace.contours;
-
-    // check if we need to auto-choose contour levels
-    if(trace.autocontour !== false) {
-        var dummyAx = autoContours(trace.zmin, trace.zmax, trace.ncontours);
-
-        contours.size = dummyAx.dtick;
-
-        contours.start = Axes.tickFirst(dummyAx);
-        dummyAx.range.reverse();
-        contours.end = Axes.tickFirst(dummyAx);
-
-        if(contours.start === trace.zmin) contours.start += contours.size;
-        if(contours.end === trace.zmax) contours.end -= contours.size;
-
-        // if you set a small ncontours, *and* the ends are exactly on zmin/zmax
-        // there's an edge case where start > end now. Make sure there's at least
-        // one meaningful contour, put it midway between the crossed values
-        if(contours.start > contours.end) {
-            contours.start = contours.end = (contours.start + contours.end) / 2;
-        }
-
-        // copy auto-contour info back to the source data.
-        // previously we copied the whole contours object back, but that had
-        // other info (coloring, showlines) that should be left to supplyDefaults
-        if(!trace._input.contours) trace._input.contours = {};
-        extendFlat(trace._input.contours, {
-            start: contours.start,
-            end: contours.end,
-            size: contours.size
-        });
-        trace._input.autocontour = true;
-    }
-    else {
-        // sanity checks on manually-supplied start/end/size
-        var start = contours.start,
-            end = contours.end,
-            inputContours = trace._input.contours;
-
-        if(start > end) {
-            contours.start = inputContours.start = end;
-            end = contours.end = inputContours.end = start;
-            start = contours.start;
-        }
-
-        if(!(contours.size > 0)) {
-            var sizeOut;
-            if(start === end) sizeOut = 1;
-            else sizeOut = autoContours(start, end, trace.ncontours).dtick;
-
-            inputContours.size = contours.size = sizeOut;
-        }
-    }
-
+    var cd = heatmapCalc(gd, trace);
+    setContours(trace);
     return cd;
 };
-
-/*
- * autoContours: make a dummy axis object with dtick we can use
- * as contours.size, and if needed we can use Axes.tickFirst
- * with this axis object to calculate the start and end too
- *
- * start: the value to start the contours at
- * end: the value to end at (must be > start)
- * ncontours: max number of contours to make, like roughDTick
- *
- * returns: an axis object
- */
-function autoContours(start, end, ncontours) {
-    var dummyAx = {
-        type: 'linear',
-        range: [start, end]
-    };
-
-    Axes.autoTicks(
-        dummyAx,
-        (end - start) / (ncontours || 15)
-    );
-
-    return dummyAx;
-}

src/traces/contourcarpet/close_boundaries.js → src/traces/contour/close_boundaries.js

@@ -11,9 +11,11 @@
 module.exports = function(pathinfo, operation, perimeter, trace) {
     // Abandon all hope, ye who enter here.
     var i, v1, v2;
-    var na = trace.a.length;
-    var nb = trace.b.length;
-    var z = trace.z;
+    var pi0 = pathinfo[0];
+    var na = pi0.x.length;
+    var nb = pi0.y.length;
+    var z = pi0.z;
+    var contours = trace.contours;
 
     var boundaryMax = -Infinity;
     var boundaryMin = Infinity;
@@ -32,36 +34,31 @@ module.exports = function(pathinfo, operation, perimeter, trace) {
         boundaryMax = Math.max(boundaryMax, z[nb - 1][i]);
     }
 
+    pi0.prefixBoundary = false;
+
     switch(operation) {
         case '>':
-        case '>=':
-            if(trace.contours.value > boundaryMax) {
-                pathinfo[0].prefixBoundary = true;
+            if(contours.value > boundaryMax) {
+                pi0.prefixBoundary = true;
             }
             break;
         case '<':
-        case '<=':
-            if(trace.contours.value < boundaryMin) {
-                pathinfo[0].prefixBoundary = true;
+            if(contours.value < boundaryMin) {
+                pi0.prefixBoundary = true;
             }
             break;
         case '[]':
-        case '()':
-            v1 = Math.min.apply(null, trace.contours.value);
-            v2 = Math.max.apply(null, trace.contours.value);
-            if(v2 < boundaryMin) {
-                pathinfo[0].prefixBoundary = true;
-            }
-            if(v1 > boundaryMax) {
-                pathinfo[0].prefixBoundary = true;
+            v1 = Math.min.apply(null, contours.value);
+            v2 = Math.max.apply(null, contours.value);
+            if(v2 < boundaryMin || v1 > boundaryMax) {
+                pi0.prefixBoundary = true;
             }
             break;
         case '][':
-        case ')(':
-            v1 = Math.min.apply(null, trace.contours.value);
-            v2 = Math.max.apply(null, trace.contours.value);
+            v1 = Math.min.apply(null, contours.value);
+            v2 = Math.max.apply(null, contours.value);
             if(v1 < boundaryMin && v2 > boundaryMax) {
-                pathinfo[0].prefixBoundary = true;
+                pi0.prefixBoundary = true;
             }
             break;
     }

src/traces/contour/constraint_defaults.js

@@ -0,0 +1,50 @@
+/**
+* Copyright 2012-2018, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+
+'use strict';
+
+var handleConstraintValueDefaults = require('./constraint_value_defaults');
+var handleLabelDefaults = require('./label_defaults');
+var Color = require('../../components/color');
+var addOpacity = Color.addOpacity;
+var opacity = Color.opacity;
+var CONSTRAINT_REDUCTION = require('../../constants/filter_ops').CONSTRAINT_REDUCTION;
+
+module.exports = function handleConstraintDefaults(traceIn, traceOut, coerce, layout, defaultColor, opts) {
+    var contours = traceOut.contours;
+    var showLines, lineColor, fillColor;
+
+    var operation = coerce('contours.operation');
+    contours._operation = CONSTRAINT_REDUCTION[operation];
+
+    handleConstraintValueDefaults(coerce, contours);
+
+    if(operation === '=') {
+        showLines = contours.showlines = true;
+    }
+    else {
+        showLines = coerce('contours.showlines');
+        fillColor = coerce('fillcolor', addOpacity(
+            (traceIn.line || {}).color || defaultColor, 0.5
+        ));
+    }
+
+    if(showLines) {
+        var lineDfltColor = fillColor && opacity(fillColor) ?
+            addOpacity(traceOut.fillcolor, 1) :
+            defaultColor;
+        lineColor = coerce('line.color', lineDfltColor);
+        coerce('line.width', 2);
+        coerce('line.dash');
+    }
+
+    coerce('line.smoothing');
+
+    handleLabelDefaults(coerce, layout, lineColor, opts);
+};