/** * @class Ext.chart.Label * * Labels is a mixin to the Series class. Labels methods are implemented * in each of the Series (Pie, Bar, etc) for label creation and placement. * * The methods implemented by the Series are: * * - **`onCreateLabel(storeItem, item, i, display)`** Called each time a new label is created. * The arguments of the method are: * - *`storeItem`* The element of the store that is related to the label sprite. * - *`item`* The item related to the label sprite. An item is an object containing the position of the shape * used to describe the visualization and also pointing to the actual shape (circle, rectangle, path, etc). * - *`i`* The index of the element created (i.e the first created label, second created label, etc) * - *`display`* The display type. May be <b>false</b> if the label is hidden * * - **`onPlaceLabel(label, storeItem, item, i, display, animate)`** Called for updating the position of the label. * The arguments of the method are: * - *`label`* The sprite label.</li> * - *`storeItem`* The element of the store that is related to the label sprite</li> * - *`item`* The item related to the label sprite. An item is an object containing the position of the shape * used to describe the visualization and also pointing to the actual shape (circle, rectangle, path, etc). * - *`i`* The index of the element to be updated (i.e. whether it is the first, second, third from the labelGroup) * - *`display`* The display type. May be <b>false</b> if the label is hidden. * - *`animate`* A boolean value to set or unset animations for the labels. */ Ext.define('Ext.chart.Label', { /* Begin Definitions */ requires: ['Ext.draw.Color'], /* End Definitions */ /** * @cfg {Object} label * Object with the following properties: * * - **display** : String * * Specifies the presence and position of labels for each pie slice. Either "rotate", "middle", "insideStart", * "insideEnd", "outside", "over", "under", or "none" to prevent label rendering. * Default value: 'none'. * * - **color** : String * * The color of the label text. * Default value: '#000' (black). * * - **contrast** : Boolean * * True to render the label in contrasting color with the backround. * Default value: false. * * - **field** : String * * The name of the field to be displayed in the label. * Default value: 'name'. * * - **minMargin** : Number * * Specifies the minimum distance from a label to the origin of the visualization. * This parameter is useful when using PieSeries width variable pie slice lengths. * Default value: 50. * * - **font** : String * * The font used for the labels. * Default value: "11px Helvetica, sans-serif". * * - **orientation** : String * * Either "horizontal" or "vertical". * Dafault value: "horizontal". * * - **renderer** : Function * * Optional function for formatting the label into a displayable value. * Default value: function(v) { return v; } */ //@private a regex to parse url type colors. colorStringRe: /url\s*\(\s*#([^\/)]+)\s*\)/, //@private the mixin constructor. Used internally by Series. constructor: function(config) { var me = this; me.label = Ext.applyIf(me.label || {}, { display: "none", color: "#000", field: "name", minMargin: 50, font: "11px Helvetica, sans-serif", orientation: "horizontal", renderer: function(v) { return v; } }); if (me.label.display !== 'none') { me.labelsGroup = me.chart.surface.getGroup(me.seriesId + '-labels'); } }, //@private a method to render all labels in the labelGroup renderLabels: function() { var me = this, chart = me.chart, gradients = chart.gradients, items = me.items, animate = chart.animate, config = me.label, display = config.display, color = config.color, field = [].concat(config.field), group = me.labelsGroup, groupLength = (group || 0) && group.length, store = me.chart.store, len = store.getCount(), itemLength = (items || 0) && items.length, ratio = itemLength / len, gradientsCount = (gradients || 0) && gradients.length, Color = Ext.draw.Color, hides = [], gradient, i, count, groupIndex, index, j, k, colorStopTotal, colorStopIndex, colorStop, item, label, storeItem, sprite, spriteColor, spriteBrightness, labelColor, colorString; if (display == 'none') { return; } // no items displayed, hide all labels if(itemLength == 0){ while(groupLength--) hides.push(groupLength); }else{ for (i = 0, count = 0, groupIndex = 0; i < len; i++) { index = 0; for (j = 0; j < ratio; j++) { item = items[count]; label = group.getAt(groupIndex); storeItem = store.getAt(i); //check the excludes while(this.__excludes && this.__excludes[index] && ratio > 1) { if(field[j]){ hides.push(groupIndex); } index++; } if (!item && label) { label.hide(true); groupIndex++; } if (item && field[j]) { if (!label) { label = me.onCreateLabel(storeItem, item, i, display, j, index); } me.onPlaceLabel(label, storeItem, item, i, display, animate, j, index); groupIndex++; //set contrast if (config.contrast && item.sprite) { sprite = item.sprite; //set the color string to the color to be set. if (sprite._endStyle) { colorString = sprite._endStyle.fill; } else if (sprite._to) { colorString = sprite._to.fill; } else { colorString = sprite.attr.fill; } colorString = colorString || sprite.attr.fill; spriteColor = Color.fromString(colorString); //color wasn't parsed property maybe because it's a gradient id if (colorString && !spriteColor) { colorString = colorString.match(me.colorStringRe)[1]; for (k = 0; k < gradientsCount; k++) { gradient = gradients[k]; if (gradient.id == colorString) { //avg color stops colorStop = 0; colorStopTotal = 0; for (colorStopIndex in gradient.stops) { colorStop++; colorStopTotal += Color.fromString(gradient.stops[colorStopIndex].color).getGrayscale(); } spriteBrightness = (colorStopTotal / colorStop) / 255; break; } } } else { spriteBrightness = spriteColor.getGrayscale() / 255; } if (label.isOutside) { spriteBrightness = 1; } labelColor = Color.fromString(label.attr.color || label.attr.fill).getHSL(); labelColor[2] = spriteBrightness > 0.5 ? 0.2 : 0.8; label.setAttributes({ fill: String(Color.fromHSL.apply({}, labelColor)) }, true); } } count++; index++; } } } me.hideLabels(hides); }, hideLabels: function(hides){ var labelsGroup = this.labelsGroup, hlen = hides.length; while(hlen--) labelsGroup.getAt(hides[hlen]).hide(true); } });