Break up legend module

src/components/legend/anchor_utils.js

@@ -0,0 +1,47 @@
+/**
+* Copyright 2012-2016, 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';
+
+
+/**
+ * Determine the position anchor property of x/y xanchor/yanchor components.
+ *
+ * - values < 1/3 align the low side at that fraction,
+ * - values [1/3, 2/3] align the center at that fraction,
+ * - values > 2/3 align the right at that fraction.
+ */
+
+exports.isRightAnchor = function isRightAnchor(opts) {
+    return (
+        opts.xanchor === 'right' ||
+        (opts.xanchor === 'auto' && opts.x >= 2 / 3)
+    );
+};
+
+exports.isCenterAnchor = function isCenterAnchor(opts) {
+    return (
+        opts.xanchor === 'center' ||
+        (opts.xanchor === 'auto' && opts.x > 1 / 3 && opts.x < 2 / 3)
+    );
+};
+
+exports.isBottomAnchor = function isTopAnchor(opts) {
+    return (
+        opts.yanchor === 'bottom' ||
+        (opts.yanchor === 'auto' && opts.y <= 1 / 3)
+    );
+};
+
+exports.isMiddleAnchor = function isMiddleAnchor(opts) {
+    return (
+        opts.yanchor === 'middle' ||
+        (opts.yanchor === 'auto' && opts.y > 1 / 3 && opts.y < 2 / 3)
+    );
+};

src/components/legend/defaults.js

@@ -0,0 +1,70 @@
+/**
+* Copyright 2012-2016, 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 Plots = require('../../plots/plots');
+
+var attributes = require('./attributes');
+var helpers = require('./helpers');
+
+
+module.exports = function legendDefaults(layoutIn, layoutOut, fullData) {
+    var containerIn = layoutIn.legend || {},
+        containerOut = layoutOut.legend = {};
+
+    var visibleTraces = 0,
+        defaultOrder = 'normal',
+        trace;
+
+    for(var i = 0; i < fullData.length; i++) {
+        trace = fullData[i];
+
+        if(helpers.legendGetsTrace(trace)) {
+            visibleTraces++;
+            // always show the legend by default if there's a pie
+            if(Plots.traceIs(trace, 'pie')) visibleTraces++;
+        }
+
+        if((Plots.traceIs(trace, 'bar') && layoutOut.barmode==='stack') ||
+                ['tonextx','tonexty'].indexOf(trace.fill)!==-1) {
+            defaultOrder = helpers.isGrouped({traceorder: defaultOrder}) ?
+                'grouped+reversed' : 'reversed';
+        }
+
+        if(trace.legendgroup !== undefined && trace.legendgroup !== '') {
+            defaultOrder = helpers.isReversed({traceorder: defaultOrder}) ?
+                'reversed+grouped' : 'grouped';
+        }
+    }
+
+    function coerce(attr, dflt) {
+        return Lib.coerce(containerIn, containerOut, attributes, attr, dflt);
+    }
+
+    var showLegend = Lib.coerce(layoutIn, layoutOut,
+        Plots.layoutAttributes, 'showlegend', visibleTraces > 1);
+
+    if(showLegend === false) return;
+
+    coerce('bgcolor', layoutOut.paper_bgcolor);
+    coerce('bordercolor');
+    coerce('borderwidth');
+    Lib.coerceFont(coerce, 'font', layoutOut.font);
+
+    coerce('traceorder', defaultOrder);
+    if(helpers.isGrouped(layoutOut.legend)) coerce('tracegroupgap');
+
+    coerce('x');
+    coerce('xanchor');
+    coerce('y');
+    coerce('yanchor');
+    Lib.noneOrAll(containerIn, containerOut, ['x', 'y']);
+};