make sunburst plot functions reusable for treemap

src/traces/sunburst/helpers.js

@@ -0,0 +1,132 @@
+/**
+* Copyright 2012-2019, 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 Lib = require('../../lib');
+var Color = require('../../components/color');
+var setCursor = require('../../lib/setcursor');
+var appendArrayPointValue = require('../../components/fx/helpers').appendArrayPointValue;
+
+exports.makeEventData = function(pt, trace) {
+    var cdi = pt.data.data;
+
+    var out = {
+        curveNumber: trace.index,
+        pointNumber: cdi.i,
+        data: trace._input,
+        fullData: trace,
+
+        // TODO more things like 'children', 'siblings', 'hierarchy?
+    };
+
+    appendArrayPointValue(out, trace, cdi.i);
+
+    return out;
+};
+
+exports.findEntryWithLevel = function(hierarchy, level) {
+    var out;
+    if(level) {
+        hierarchy.eachAfter(function(pt) {
+            if(exports.getPtId(pt) === level) {
+                return out = pt.copy();
+            }
+        });
+    }
+    return out || hierarchy;
+};
+
+exports.findEntryWithChild = function(hierarchy, childId) {
+    var out;
+    hierarchy.eachAfter(function(pt) {
+        var children = pt.children || [];
+        for(var i = 0; i < children.length; i++) {
+            var child = children[i];
+            if(exports.getPtId(child) === childId) {
+                return out = pt.copy();
+            }
+        }
+    });
+    return out || hierarchy;
+};
+
+exports.isHierachyRoot = function(pt) {
+    var cdi = pt.data.data;
+    return cdi.pid === '';
+};
+
+exports.isEntry = function(pt) {
+    return !pt.parent;
+};
+
+exports.isLeaf = function(pt) {
+    return !pt.children;
+};
+
+exports.getPtId = function(pt) {
+    var cdi = pt.data.data;
+    return cdi.id;
+};
+
+exports.setSliceCursor = function(sliceTop, gd, opts) {
+    var pt = sliceTop.datum();
+    var isTransitioning = (opts || {}).isTransitioning;
+    setCursor(sliceTop, (isTransitioning || exports.isLeaf(pt) || exports.isHierachyRoot(pt)) ? null : 'pointer');
+};
+
+exports.determineOutsideTextFont = function(trace, pt, layoutFont) {
+    var cdi = pt.data.data;
+    var ptNumber = cdi.i;
+
+    var color = Lib.castOption(trace, ptNumber, 'outsidetextfont.color') ||
+        Lib.castOption(trace, ptNumber, 'textfont.color') ||
+        layoutFont.color;
+
+    var family = Lib.castOption(trace, ptNumber, 'outsidetextfont.family') ||
+        Lib.castOption(trace, ptNumber, 'textfont.family') ||
+        layoutFont.family;
+
+    var size = Lib.castOption(trace, ptNumber, 'outsidetextfont.size') ||
+        Lib.castOption(trace, ptNumber, 'textfont.size') ||
+        layoutFont.size;
+
+    return {
+        color: color,
+        family: family,
+        size: size
+    };
+};
+
+exports.determineInsideTextFont = function(trace, pt, layoutFont) {
+    var cdi = pt.data.data;
+    var ptNumber = cdi.i;
+
+    var customColor = Lib.castOption(trace, ptNumber, 'insidetextfont.color');
+    if(!customColor && trace._input.textfont) {
+        // Why not simply using trace.textfont? Because if not set, it
+        // defaults to layout.font which has a default color. But if
+        // textfont.color and insidetextfont.color don't supply a value,
+        // a contrasting color shall be used.
+        customColor = Lib.castOption(trace._input, ptNumber, 'textfont.color');
+    }
+
+    var family = Lib.castOption(trace, ptNumber, 'insidetextfont.family') ||
+        Lib.castOption(trace, ptNumber, 'textfont.family') ||
+        layoutFont.family;
+
+    var size = Lib.castOption(trace, ptNumber, 'insidetextfont.size') ||
+        Lib.castOption(trace, ptNumber, 'textfont.size') ||
+        layoutFont.size;
+
+    return {
+        color: customColor || Color.contrast(cdi.color),
+        family: family,
+        size: size
+    };
+};