annotation hover text

alexcjohnson · alexcjohnson · commit 58966edb10b8 · 2017-04-10T10:16:48.000-04:00
diff --git a/build/plotcss.js b/build/plotcss.js
@@ -14,6 +14,7 @@ var rules = {
     "X svg a:hover": "fill:#3c6dc5;",
     "X .main-svg": "position:absolute;top:0;left:0;pointer-events:none;",
     "X .main-svg .draglayer": "pointer-events:all;",
+    "X .cursor-default": "cursor:default;",
     "X .cursor-pointer": "cursor:pointer;",
     "X .cursor-crosshair": "cursor:crosshair;",
     "X .cursor-move": "cursor:move;",
diff --git a/src/components/annotations/annotation_defaults.js b/src/components/annotations/annotation_defaults.js
@@ -12,6 +12,7 @@
 var Lib = require('../../lib');
 var Color = require('../color');
 var Axes = require('../../plots/cartesian/axes');
+var constants = require('../../plots/cartesian/constants');
 
 var attributes = require('./attributes');
 
@@ -30,7 +31,7 @@ module.exports = function handleAnnotationDefaults(annIn, annOut, fullLayout, op
     if(!(visible || clickToShow)) return annOut;
 
     coerce('opacity');
-    coerce('bgcolor');
+    var bgColor = coerce('bgcolor');
 
     var borderColor = coerce('bordercolor'),
         borderOpacity = Color.opacity(borderColor);
@@ -108,5 +109,17 @@ module.exports = function handleAnnotationDefaults(annIn, annOut, fullLayout, op
         annOut._yclick = (yClick === undefined) ? annOut.y : yClick;
     }
 
+    var hoverText = coerce('hovertext');
+    if(hoverText) {
+        var hoverBG = coerce('hoverlabel.bgcolor',
+            Color.opacity(bgColor) ? Color.rgb(bgColor) : Color.defaultLine);
+        var hoverBorder = coerce('hoverlabel.bordercolor', Color.contrast(hoverBG));
+        Lib.coerceFont(coerce, 'hoverlabel.font', {
+            family: constants.HOVERFONT,
+            size: constants.HOVERFONTSIZE,
+            color: hoverBorder
+        });
+    }
+
     return annOut;
 };
diff --git a/src/components/annotations/attributes.js b/src/components/annotations/attributes.js
@@ -378,6 +378,41 @@ module.exports = {
             'is `yclick` rather than the annotation\'s `y` value.'
         ].join(' ')
     },
+    hovertext: {
+        valType: 'string',
+        role: 'info',
+        description: [
+            'Sets text to appear when hovering over this annotation.',
+            'If omitted or blank, no hover label will appear.'
+        ].join(' ')
+    },
+    hoverlabel: {
+        bgcolor: {
+            valType: 'color',
+            role: 'style',
+            description: [
+                'Sets the background color of the hover label.',
+                'By default uses the annotation\'s `bgcolor` made opaque,',
+                'or white if it was transparent.'
+            ].join(' ')
+        },
+        bordercolor: {
+            valType: 'color',
+            role: 'style',
+            description: [
+                'Sets the border color of the hover label.',
+                'By default uses either dark grey or white, for maximum',
+                'contrast with `hoverlabel.bgcolor`.'
+            ].join(' ')
+        },
+        font: extendFlat({}, fontAttrs, {
+            description: [
+                'Sets the hover label text font.',
+                'By default uses the global hover font and size,',
+                'with color from `hoverlabel.bordercolor`.'
+            ].join(' ')
+        })
+    },
 
     _deprecated: {
         ref: {
diff --git a/src/components/annotations/draw.js b/src/components/annotations/draw.js
@@ -15,6 +15,7 @@ var Plotly = require('../../plotly');
 var Plots = require('../../plots/plots');
 var Lib = require('../../lib');
 var Axes = require('../../plots/cartesian/axes');
+var Fx = require('../../plots/cartesian/graph_interact');
 var Color = require('../color');
 var Drawing = require('../drawing');
 var svgTextUtils = require('../../lib/svg_text_utils');
@@ -96,7 +97,16 @@ function drawOne(gd, index) {
     var annGroup = fullLayout._infolayer.append('g')
         .classed('annotation', true)
         .attr('data-index', String(index))
-        .style('opacity', options.opacity)
+        .style('opacity', options.opacity);
+
+    // another group for text+background so that they can rotate together
+    var annTextGroup = annGroup.append('g')
+        .classed('annotation-text-g', true)
+        .attr('data-index', String(index));
+
+    var annTextGroupInner = annTextGroup.append('g')
+        .style('pointer-events', 'all')
+        .call(setCursor, 'default')
         .on('click', function() {
             gd._dragging = false;
             gd.emit('plotly_clickannotation', {
@@ -106,12 +116,33 @@ function drawOne(gd, index) {
             });
         });
 
-    // another group for text+background so that they can rotate together
-    var annTextGroup = annGroup.append('g')
-        .classed('annotation-text-g', true)
-        .attr('data-index', String(index));
-
-    var annTextGroupInner = annTextGroup.append('g');
+    if(options.hovertext) {
+        annTextGroupInner
+        .on('mouseover', function() {
+            var hoverOptions = options.hoverlabel;
+            var hoverFont = hoverOptions.font;
+            var bBox = this.getBoundingClientRect();
+            var bBoxRef = gd.getBoundingClientRect();
+
+            Fx.loneHover({
+                x0: bBox.left - bBoxRef.left,
+                x1: bBox.right - bBoxRef.left,
+                y: (bBox.top + bBox.bottom) / 2 - bBoxRef.top,
+                text: options.hovertext,
+                color: hoverOptions.bgcolor,
+                borderColor: hoverOptions.bordercolor,
+                fontFamily: hoverFont.family,
+                fontSize: hoverFont.size,
+                fontColor: hoverFont.color
+            }, {
+                container: fullLayout._hoverlayer.node(),
+                outerContainer: fullLayout._paper.node()
+            });
+        })
+        .on('mouseout', function() {
+            Fx.loneUnhover(fullLayout._hoverlayer.node());
+        });
+    }
 
     var borderwidth = options.borderwidth,
         borderpad = options.borderpad,
diff --git a/src/components/color/index.js b/src/components/color/index.js
@@ -20,6 +20,10 @@ color.defaultLine = colorAttrs.defaultLine;
 color.lightLine = colorAttrs.lightLine;
 color.background = colorAttrs.background;
 
+/*
+ * tinyRGB: turn a tinycolor into an rgb string, but
+ * unlike the built-in tinycolor.toRgbString this never includes alpha
+ */
 color.tinyRGB = function(tc) {
     var c = tc.toRgb();
     return 'rgb(' + Math.round(c.r) + ', ' +
@@ -57,12 +61,23 @@ color.combine = function(front, back) {
     return tinycolor(fcflat).toRgbString();
 };
 
+/*
+ * Create a color that contrasts with cstr.
+ *
+ * If cstr is a dark color, we lighten it; if it's light, we darken.
+ *
+ * If lightAmount / darkAmount are used, we adjust by these percentages,
+ * otherwise we go all the way to white or black.
+ * TODO: black is what we've always done for hover, but should it be #444 instead?
+ */
 color.contrast = function(cstr, lightAmount, darkAmount) {
     var tc = tinycolor(cstr);
 
-    var newColor = tc.isLight() ?
-        tc.darken(darkAmount) :
-        tc.lighten(lightAmount);
+    if(tc.getAlpha() !== 1) tc = tinycolor(color.combine(cstr, '#fff'));
+
+    var newColor = tc.isDark() ?
+        (lightAmount ? tc.lighten(lightAmount) : '#fff') :
+        (darkAmount ? tc.darken(darkAmount) : '#000');
 
     return newColor.toString();
 };
diff --git a/src/css/_cursor.scss b/src/css/_cursor.scss
@@ -1,3 +1,4 @@
+.cursor-default { cursor: default; }
 .cursor-pointer { cursor: pointer; }
 .cursor-crosshair { cursor: crosshair; }
 .cursor-move { cursor: move; }
diff --git a/src/plots/cartesian/graph_interact.js b/src/plots/cartesian/graph_interact.js
@@ -10,7 +10,6 @@
 'use strict';
 
 var d3 = require('d3');
-var tinycolor = require('tinycolor2');
 var isNumeric = require('fast-isnumeric');
 
 var Lib = require('../../lib');
@@ -246,9 +245,7 @@ function quadrature(dx, dy) {
 
 // size and display constants for hover text
 var HOVERARROWSIZE = constants.HOVERARROWSIZE,
-    HOVERTEXTPAD = constants.HOVERTEXTPAD,
-    HOVERFONTSIZE = constants.HOVERFONTSIZE,
-    HOVERFONT = constants.HOVERFONT;
+    HOVERTEXTPAD = constants.HOVERTEXTPAD;
 
 // fx.hover: highlight data on hover
 // evt can be a mousemove event, or an object with data about what points
@@ -755,23 +752,36 @@ function cleanPoint(d, hovermode) {
     return d;
 }
 
+/*
+ * Draw a single hover item in a pre-existing svg container somewhere
+ * hoverItem should have keys:
+ *    - x and y (or x0, x1, y0, and y1):
+ *      the pixel position to mark, relative to opts.container
+ *    - xLabel, yLabel, zLabel, text, and name:
+ *      info to go in the label
+ *    - color:
+ *      the background color for the label.
+ *    - idealAlign (optional):
+ *      'left' or 'right' for which side of the x/y box to try to put this on first
+ *    - borderColor (optional):
+ *      color for the border, defaults to strongest contrast with color
+ *    - fontFamily (optional):
+ *      string, the font for this label, defaults to constants.HOVERFONT
+ *    - fontSize (optional):
+ *      the label font size, defaults to constants.HOVERFONTSIZE
+ *    - fontColor (optional):
+ *      defaults to borderColor
+ * opts should have keys:
+ *    - bgColor:
+ *      the background color this is against, used if the trace is
+ *      non-opaque, and for the name, which goes outside the box
+ *    - container:
+ *      a dom <svg> element - must be big enough to contain the whole
+ *      hover label
+ *    - outerContainer:
+ *      TODO: what exactly is container vs outerContainer?
+ */
 fx.loneHover = function(hoverItem, opts) {
-    // draw a single hover item in a pre-existing svg container somewhere
-    // hoverItem should have keys:
-    //    - x and y (or x0, x1, y0, and y1):
-    //      the pixel position to mark, relative to opts.container
-    //    - xLabel, yLabel, zLabel, text, and name:
-    //      info to go in the label
-    //    - color:
-    //      the background color for the label. text & outline color will
-    //      be chosen black or white to contrast with this
-    // opts should have keys:
-    //    - bgColor:
-    //      the background color this is against, used if the trace is
-    //      non-opaque, and for the name, which goes outside the box
-    //    - container:
-    //      a dom <svg> element - must be big enough to contain the whole
-    //      hover label
     var pointData = {
         color: hoverItem.color || Color.defaultLine,
         x0: hoverItem.x0 || hoverItem.x || 0,
@@ -785,6 +795,12 @@ fx.loneHover = function(hoverItem, opts) {
         name: hoverItem.name,
         idealAlign: hoverItem.idealAlign,
 
+        // optional extra bits of styling
+        borderColor: hoverItem.borderColor,
+        fontFamily: hoverItem.fontFamily,
+        fontSize: hoverItem.fontSize,
+        fontColor: hoverItem.fontColor,
+
         // filler to make createHoverText happy
         trace: {
             index: 0,
@@ -830,6 +846,12 @@ function createHoverText(hoverData, opts) {
         container = opts.container,
         outerContainer = opts.outerContainer,
 
+        // opts.fontFamily/Size are used for the common label
+        // and as defaults for each hover label, though the individual labels
+        // can override this.
+        fontFamily = opts.fontFamily || constants.HOVERFONT,
+        fontSize = opts.fontSize || constants.HOVERFONTSIZE,
+
         c0 = hoverData[0],
         xa = c0.xa,
         ya = c0.ya,
@@ -874,7 +896,7 @@ function createHoverText(hoverData, opts) {
         lpath.enter().append('path')
             .style({fill: Color.defaultLine, 'stroke-width': '1px', stroke: Color.background});
         ltext.enter().append('text')
-            .call(Drawing.font, HOVERFONT, HOVERFONTSIZE, Color.background)
+            .call(Drawing.font, fontFamily, fontSize, Color.background)
             // prohibit tex interpretation until we can handle
             // tex and regular text together
             .attr('data-notex', 1);
@@ -955,13 +977,12 @@ function createHoverText(hoverData, opts) {
             // trace name label (rect and text.name)
             g.append('rect')
                 .call(Color.fill, Color.addOpacity(bgColor, 0.8));
-            g.append('text').classed('name', true)
-                .call(Drawing.font, HOVERFONT, HOVERFONTSIZE);
+            g.append('text').classed('name', true);
             // trace data label (path and text.nums)
             g.append('path')
                 .style('stroke-width', '1px');
             g.append('text').classed('nums', true)
-                .call(Drawing.font, HOVERFONT, HOVERFONTSIZE);
+                .call(Drawing.font, fontFamily, fontSize);
         });
     hoverLabels.exit().remove();
 
@@ -977,8 +998,7 @@ function createHoverText(hoverData, opts) {
             traceColor = Color.combine(baseColor, bgColor),
 
             // find a contrasting color for border and text
-            contrastColor = tinycolor(traceColor).getBrightness() > 128 ?
-                '#000' : Color.background;
+            contrastColor = d.borderColor || Color.contrast(traceColor);
 
         // to get custom 'name' labels pass cleanPoint
         if(d.nameOverride !== undefined) d.name = d.nameOverride;
@@ -1023,7 +1043,10 @@ function createHoverText(hoverData, opts) {
 
         // main label
         var tx = g.select('text.nums')
-            .style('fill', contrastColor)
+            .call(Drawing.font,
+                d.fontFamily || fontFamily,
+                d.fontSize || fontSize,
+                d.fontColor || contrastColor)
             .call(Drawing.setPosition, 0, 0)
             .text(text)
             .attr('data-notex', 1)
@@ -1036,7 +1059,10 @@ function createHoverText(hoverData, opts) {
 
         // secondary label for non-empty 'name'
         if(name && name !== text) {
-            tx2.style('fill', traceColor)
+            tx2.call(Drawing.font,
+                    d.fontFamily || fontFamily,
+                    d.fontSize || fontSize,
+                    traceColor)
                 .text(name)
                 .call(Drawing.setPosition, 0, 0)
                 .attr('data-notex', 1)
diff --git a/test/jasmine/tests/annotations_test.js b/test/jasmine/tests/annotations_test.js

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+.cursor-default { cursor: default; }`
`1`	`2`	`.cursor-pointer { cursor: pointer; }`
`2`	`3`	`.cursor-crosshair { cursor: crosshair; }`
`3`	`4`	`.cursor-move { cursor: move; }`