Add texttemplate attribute to shape.label

src/components/shapes/attributes.js

@@ -7,6 +7,8 @@ var dash = require('../drawing/attributes').dash;
 var extendFlat = require('../../lib/extend').extendFlat;
 var templatedArray = require('../../plot_api/plot_template').templatedArray;
 var axisPlaceableObjs = require('../../constants/axis_placeable_objects');
+var shapeTexttemplateAttrs = require('../../plots/template_attributes').shapeTexttemplateAttrs;
+var shapeLabelTexttemplateVars = require('./label_texttemplate');
 
 module.exports = templatedArray('shape', {
     visible: {
@@ -232,6 +234,7 @@ module.exports = templatedArray('shape', {
             editType: 'arraydraw',
             description: 'Sets the text to display with shape.'
         },
+        texttemplate: shapeTexttemplateAttrs({}, {keys: Object.keys(shapeLabelTexttemplateVars)}),
         font: fontAttrs({
             editType: 'calc+arraydraw',
             colorEditType: 'arraydraw',

src/components/shapes/defaults.js

@@ -129,7 +129,8 @@ function handleShapeDefaults(shapeIn, shapeOut, fullLayout) {
     // Label options
     var isLine = shapeType === 'line';
     var labelText = coerce('label.text');
-    if(labelText) {
+    var labelTextTemplate = coerce('label.texttemplate');
+    if(labelText || labelTextTemplate) {
         coerce('label.textangle');
         var labelTextPosition = coerce('label.textposition', isLine ? 'middle' : 'middle center');
         coerce('label.xanchor');

src/components/shapes/draw.js

@@ -23,6 +23,7 @@ var svgTextUtils = require('../../lib/svg_text_utils');
 var constants = require('./constants');
 var helpers = require('./helpers');
 var getPathString = helpers.getPathString;
+var shapeLabelTexttemplateVars = require('./label_texttemplate');
 var FROM_TL = require('../../constants/alignment').FROM_TL;
 
 
@@ -38,7 +39,8 @@ var FROM_TL = require('../../constants/alignment').FROM_TL;
 module.exports = {
     draw: draw,
     drawOne: drawOne,
-    eraseActiveShape: eraseActiveShape
+    eraseActiveShape: eraseActiveShape,
+    drawLabel: drawLabel,
 };
 
 function draw(gd) {
@@ -168,7 +170,7 @@ function drawOne(gd, index) {
                 plotinfo: plotinfo,
                 gd: gd,
                 editHelpers: editHelpers,
-                hasText: options.label.text,
+                hasText: options.label.text || options.label.texttemplate,
                 isActiveShape: true // i.e. to enable controllers
             };
 
@@ -605,13 +607,30 @@ function drawLabel(gd, index, options, shapeGroup) {
     // Remove existing label
     shapeGroup.selectAll('.shape-label').remove();
 
-    // If no label, return
-    if(!options.label.text) return;
+    // If no label text or texttemplate, return
+    if(!(options.label.text || options.label.texttemplate)) return;
+
+    // Text template overrides text
+    var text = options.label.text;
+    if(options.label.texttemplate) {
+        var templateValues = {};
+        if(options.type !== 'path') {
+            var _xa = Axes.getFromId(gd, options.xref);
+            var _ya = Axes.getFromId(gd, options.yref);
+            Object.keys(shapeLabelTexttemplateVars).forEach(function(key) {
+                var val = shapeLabelTexttemplateVars[key](options, _xa, _ya);
+                if(val !== undefined) templateValues[key] = val;
+            });
+        }
+        text = Lib.texttemplateStringForShapes(options.label.texttemplate,
+            {},
+            gd._fullLayout._d3locale,
+            templateValues);
+    }
 
     var labelGroupAttrs = {
         'data-index': index,
     };
-    var text = options.label.text;
     var font = options.label.font;
 
     var labelTextAttrs = {

src/components/shapes/draw_newshape/attributes.js

@@ -3,6 +3,9 @@
 var fontAttrs = require('../../../plots/font_attributes');
 var dash = require('../../drawing/attributes').dash;
 var extendFlat = require('../../../lib/extend').extendFlat;
+var shapeTexttemplateAttrs = require('../../../plots/template_attributes').shapeTexttemplateAttrs;
+var shapeLabelTexttemplateVars = require('../label_texttemplate');
+
 
 module.exports = {
     newshape: {
@@ -86,6 +89,7 @@ module.exports = {
                 editType: 'none',
                 description: 'Sets the text to display with the new shape.'
             },
+            texttemplate: shapeTexttemplateAttrs({newshape: true, editType: 'none'}, {keys: Object.keys(shapeLabelTexttemplateVars)}),
             font: fontAttrs({
                 editType: 'none',
                 description: 'Sets the new shape label text font.'

src/components/shapes/draw_newshape/defaults.js

@@ -28,7 +28,8 @@ module.exports = function supplyDrawNewShapeDefaults(layoutIn, layoutOut, coerce
 
     var isLine = layoutIn.dragmode === 'drawline';
     var labelText = coerce('newshape.label.text');
-    if(labelText) {
+    var labelTextTemplate = coerce('newshape.label.texttemplate');
+    if(labelText || labelTextTemplate) {
         coerce('newshape.label.textangle');
         var labelTextPosition = coerce('newshape.label.textposition', isLine ? 'middle' : 'middle center');
         coerce('newshape.label.xanchor');

src/components/shapes/label_texttemplate.js

@@ -0,0 +1,82 @@
+'use strict';
+
+function d2l(v, axis) {
+    return (
+        axis.type === 'log' ? v :
+        axis.d2l(v)
+    );
+}
+
+function getPos(x, xa) {
+    return (
+        xa.type === 'date' ? x :
+        d2l(x, xa)
+    );
+}
+
+function x0Fn(shape, xa) { return getPos(shape.x0, xa); }
+function x1Fn(shape, xa) { return getPos(shape.x1, xa); }
+function y0Fn(shape, xa, ya) { return getPos(shape.y0, ya); }
+function y1Fn(shape, xa, ya) { return getPos(shape.y1, ya); }
+
+function dxFn(shape, xa) {
+    return (
+        d2l(shape.x1, xa) -
+        d2l(shape.x0, xa)
+    );
+}
+
+function dyFn(shape, xa, ya) {
+    return (
+        d2l(shape.y1, ya) -
+        d2l(shape.y0, ya)
+    );
+}
+
+function widthFn(shape, xa) {
+    return Math.abs(dxFn(shape, xa));
+}
+
+function heightFn(shape, xa, ya) {
+    return Math.abs(dyFn(shape, xa, ya));
+}
+
+function lengthFn(shape, xa, ya) {
+    return (shape.type !== 'line') ? undefined :
+        Math.sqrt(
+            Math.pow((d2l(shape.x1, xa) - d2l(shape.x0, xa)), 2) +
+            Math.pow((d2l(shape.y1, ya) - d2l(shape.y0, ya)), 2)
+        );
+}
+
+function xcenterFn(shape, xa) {
+    var val = (d2l(shape.x1, xa) + d2l(shape.x0, xa)) / 2;
+    return (xa.type === 'date') ? xa.l2d(val) : val;
+}
+
+function ycenterFn(shape, xa, ya) {
+    var val = (d2l(shape.y1, ya) + d2l(shape.y0, ya)) / 2;
+    return (ya.type === 'date') ? ya.l2d(val) : val;
+}
+
+function slopeFn(shape, xa, ya) {
+    return (shape.type !== 'line') ? undefined : (
+        (d2l(shape.y1, ya) - d2l(shape.y0, ya)) /
+        (d2l(shape.x1, xa) - d2l(shape.x0, xa))
+    );
+}
+
+module.exports = {
+    x0: x0Fn,
+    x1: x1Fn,
+    y0: y0Fn,
+    y1: y1Fn,
+    slope: slopeFn,
+    dx: dxFn,
+    dy: dyFn,
+    width: widthFn,
+    height: heightFn,
+    length: lengthFn,
+    xcenter: xcenterFn,
+    ycenter: ycenterFn,
+};

src/lib/index.js

@@ -1074,6 +1074,26 @@ lib.texttemplateString = function() {
     return templateFormatString.apply(texttemplateWarnings, arguments);
 };
 
+// Regex for parsing multiplication and division operations applied to a template key
+// Used for shape.label.texttemplate
+// Matches a key name (non-whitespace characters), followed by a * or / character, followed by a number
+// For example, the following strings are matched: `x0*2`, `slope/1.60934`, `y1*2.54`
+var MULT_DIV_REGEX = /^(\S+)([\*\/])(-?\d+(\.\d+)?)$/;
+function multDivParser(inputStr) {
+    var match = inputStr.match(MULT_DIV_REGEX);
+    if(match) return { key: match[1], op: match[2], number: Number(match[3]) };
+    return { key: inputStr, op: null, number: null };
+}
+var texttemplateWarningsForShapes = {
+    max: 10,
+    count: 0,
+    name: 'texttemplate',
+    parseMultDiv: true,
+};
+lib.texttemplateStringForShapes = function() {
+    return templateFormatString.apply(texttemplateWarningsForShapes, arguments);
+};
+
 var TEMPLATE_STRING_FORMAT_SEPARATOR = /^[:|\|]/;
 /**
  * Substitute values from an object into a string and optionally formats them using d3-format,
@@ -1122,6 +1142,17 @@ function templateFormatString(string, labels, d3locale) {
         if(isSpaceOther || isSpaceOtherSpace) key = key.substring(1);
         if(isOtherSpace || isSpaceOtherSpace) key = key.substring(0, key.length - 1);
 
+        // Shape labels support * and / operators in template string
+        // Parse these if the parseMultDiv param is set to true
+        var parsedOp = null;
+        var parsedNumber = null;
+        if(opts.parseMultDiv) {
+            var _match = multDivParser(key);
+            key = _match.key;
+            parsedOp = _match.op;
+            parsedNumber = _match.number;
+        }
+
         var value;
         if(hasOther) {
             value = labels[key];
@@ -1145,6 +1176,14 @@ function templateFormatString(string, labels, d3locale) {
             }
         }
 
+        // Apply mult/div operation (if applicable)
+        if((parsedOp === '*' || parsedOp === '/') && value !== undefined) {
+            value = {
+                '*': (function(v) { return v * parsedNumber; }),
+                '/': (function(v) { return v / parsedNumber; }),
+            }[parsedOp](value);
+        }
+
         if(value === undefined && opts) {
             if(opts.count < opts.max) {
                 lib.warn('Variable \'' + key + '\' in ' + opts.name + ' could not be found!');

src/plots/template_attributes.js

@@ -23,6 +23,23 @@ function templateFormatStringDescription(opts) {
     ].join(' ');
 }
 
+function shapeTemplateFormatStringDescription() {
+    return [
+        'Variables are inserted using %{variable},',
+        'for example "x0: %{x0}".',
+        'Numbers are formatted using d3-format\'s syntax %{variable:d3-format}, for example "Price: %{x0:$.2f}". See',
+        FORMAT_LINK,
+        'for details on the formatting syntax.',
+        'Dates are formatted using d3-time-format\'s syntax %{variable|d3-time-format}, for example "Day: %{x0|%m %b %Y}". See',
+        DATE_FORMAT_LINK,
+        'for details on the date formatting syntax.',
+        'A single multiplication or division operation may be applied to numeric variables, and combined with',
+        'd3 number formatting, for example "Length in cm: %{x0*2.54}", "%{slope*60:.1f} meters per second."',
+        'For log axes, variable values are given in log units.',
+        'For date axes, x/y coordinate variables and center variables use datetimes, while all other variable values use values in ms.',
+    ].join(' ');
+}
+
 function describeVariables(extra) {
     var descPart = extra.description ? ' ' + extra.description : '';
     var keys = extra.keys || [];
@@ -33,9 +50,9 @@ function describeVariables(extra) {
         }
         descPart = descPart + 'Finally, the template string has access to ';
         if(keys.length === 1) {
-            descPart = 'variable ' + quotedKeys[0];
+            descPart = descPart + 'variable ' + quotedKeys[0];
         } else {
-            descPart = 'variables ' + quotedKeys.slice(0, -1).join(', ') + ' and ' + quotedKeys.slice(-1) + '.';
+            descPart = descPart + 'variables ' + quotedKeys.slice(0, -1).join(', ') + ' and ' + quotedKeys.slice(-1) + '.';
         }
     }
     return descPart;
@@ -94,3 +111,26 @@ exports.texttemplateAttrs = function(opts, extra) {
     }
     return texttemplate;
 };
+
+
+exports.shapeTexttemplateAttrs = function(opts, extra) {
+    opts = opts || {};
+    extra = extra || {};
+
+    var newStr = opts.newshape ? 'new ' : '';
+
+    var descPart = describeVariables(extra);
+
+    var texttemplate = {
+        valType: 'string',
+        dflt: '',
+        editType: opts.editType || 'arraydraw',
+        description: [
+            'Template string used for rendering the ' + newStr + 'shape\'s label.',
+            'Note that this will override `text`.',
+            shapeTemplateFormatStringDescription(),
+            descPart,
+        ].join(' ')
+    };
+    return texttemplate;
+};