Current File : /home/tjamichg/cursos.tjamich.gob.mx/web/assets/chart.js/src/plugins/plugin.legend.js
'use strict';
var defaults = require('../core/core.defaults');
var Element = require('../core/core.element');
var helpers = require('../helpers/index');
var layouts = require('../core/core.layouts');
var getRtlHelper = helpers.rtl.getRtlAdapter;
var noop = helpers.noop;
var valueOrDefault = helpers.valueOrDefault;
defaults._set('global', {
legend: {
display: true,
position: 'top',
align: 'center',
fullWidth: true,
reverse: false,
weight: 1000,
// a callback that will handle
onClick: function(e, legendItem) {
var index = legendItem.datasetIndex;
var ci = this.chart;
var meta = ci.getDatasetMeta(index);
// See controller.isDatasetVisible comment
meta.hidden = meta.hidden === null ? !ci.data.datasets[index].hidden : null;
// We hid a dataset ... rerender the chart
ci.update();
},
onHover: null,
onLeave: null,
labels: {
boxWidth: 40,
padding: 10,
// Generates labels shown in the legend
// Valid properties to return:
// text : text to display
// fillStyle : fill of coloured box
// strokeStyle: stroke of coloured box
// hidden : if this legend item refers to a hidden item
// lineCap : cap style for line
// lineDash
// lineDashOffset :
// lineJoin :
// lineWidth :
generateLabels: function(chart) {
var datasets = chart.data.datasets;
var options = chart.options.legend || {};
var usePointStyle = options.labels && options.labels.usePointStyle;
return chart._getSortedDatasetMetas().map(function(meta) {
var style = meta.controller.getStyle(usePointStyle ? 0 : undefined);
return {
text: datasets[meta.index].label,
fillStyle: style.backgroundColor,
hidden: !chart.isDatasetVisible(meta.index),
lineCap: style.borderCapStyle,
lineDash: style.borderDash,
lineDashOffset: style.borderDashOffset,
lineJoin: style.borderJoinStyle,
lineWidth: style.borderWidth,
strokeStyle: style.borderColor,
pointStyle: style.pointStyle,
rotation: style.rotation,
// Below is extra data used for toggling the datasets
datasetIndex: meta.index
};
}, this);
}
}
},
legendCallback: function(chart) {
var list = document.createElement('ul');
var datasets = chart.data.datasets;
var i, ilen, listItem, listItemSpan;
list.setAttribute('class', chart.id + '-legend');
for (i = 0, ilen = datasets.length; i < ilen; i++) {
listItem = list.appendChild(document.createElement('li'));
listItemSpan = listItem.appendChild(document.createElement('span'));
listItemSpan.style.backgroundColor = datasets[i].backgroundColor;
if (datasets[i].label) {
listItem.appendChild(document.createTextNode(datasets[i].label));
}
}
return list.outerHTML;
}
});
/**
* Helper function to get the box width based on the usePointStyle option
* @param {object} labelopts - the label options on the legend
* @param {number} fontSize - the label font size
* @return {number} width of the color box area
*/
function getBoxWidth(labelOpts, fontSize) {
return labelOpts.usePointStyle && labelOpts.boxWidth > fontSize ?
fontSize :
labelOpts.boxWidth;
}
/**
* IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
*/
var Legend = Element.extend({
initialize: function(config) {
var me = this;
helpers.extend(me, config);
// Contains hit boxes for each dataset (in dataset order)
me.legendHitBoxes = [];
/**
* @private
*/
me._hoveredItem = null;
// Are we in doughnut mode which has a different data type
me.doughnutMode = false;
},
// These methods are ordered by lifecycle. Utilities then follow.
// Any function defined here is inherited by all legend types.
// Any function can be extended by the legend type
beforeUpdate: noop,
update: function(maxWidth, maxHeight, margins) {
var me = this;
// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
me.beforeUpdate();
// Absorb the master measurements
me.maxWidth = maxWidth;
me.maxHeight = maxHeight;
me.margins = margins;
// Dimensions
me.beforeSetDimensions();
me.setDimensions();
me.afterSetDimensions();
// Labels
me.beforeBuildLabels();
me.buildLabels();
me.afterBuildLabels();
// Fit
me.beforeFit();
me.fit();
me.afterFit();
//
me.afterUpdate();
return me.minSize;
},
afterUpdate: noop,
//
beforeSetDimensions: noop,
setDimensions: function() {
var me = this;
// Set the unconstrained dimension before label rotation
if (me.isHorizontal()) {
// Reset position before calculating rotation
me.width = me.maxWidth;
me.left = 0;
me.right = me.width;
} else {
me.height = me.maxHeight;
// Reset position before calculating rotation
me.top = 0;
me.bottom = me.height;
}
// Reset padding
me.paddingLeft = 0;
me.paddingTop = 0;
me.paddingRight = 0;
me.paddingBottom = 0;
// Reset minSize
me.minSize = {
width: 0,
height: 0
};
},
afterSetDimensions: noop,
//
beforeBuildLabels: noop,
buildLabels: function() {
var me = this;
var labelOpts = me.options.labels || {};
var legendItems = helpers.callback(labelOpts.generateLabels, [me.chart], me) || [];
if (labelOpts.filter) {
legendItems = legendItems.filter(function(item) {
return labelOpts.filter(item, me.chart.data);
});
}
if (me.options.reverse) {
legendItems.reverse();
}
me.legendItems = legendItems;
},
afterBuildLabels: noop,
//
beforeFit: noop,
fit: function() {
var me = this;
var opts = me.options;
var labelOpts = opts.labels;
var display = opts.display;
var ctx = me.ctx;
var labelFont = helpers.options._parseFont(labelOpts);
var fontSize = labelFont.size;
// Reset hit boxes
var hitboxes = me.legendHitBoxes = [];
var minSize = me.minSize;
var isHorizontal = me.isHorizontal();
if (isHorizontal) {
minSize.width = me.maxWidth; // fill all the width
minSize.height = display ? 10 : 0;
} else {
minSize.width = display ? 10 : 0;
minSize.height = me.maxHeight; // fill all the height
}
// Increase sizes here
if (!display) {
me.width = minSize.width = me.height = minSize.height = 0;
return;
}
ctx.font = labelFont.string;
if (isHorizontal) {
// Labels
// Width of each line of legend boxes. Labels wrap onto multiple lines when there are too many to fit on one
var lineWidths = me.lineWidths = [0];
var totalHeight = 0;
ctx.textAlign = 'left';
ctx.textBaseline = 'middle';
helpers.each(me.legendItems, function(legendItem, i) {
var boxWidth = getBoxWidth(labelOpts, fontSize);
var width = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
if (i === 0 || lineWidths[lineWidths.length - 1] + width + 2 * labelOpts.padding > minSize.width) {
totalHeight += fontSize + labelOpts.padding;
lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = 0;
}
// Store the hitbox width and height here. Final position will be updated in `draw`
hitboxes[i] = {
left: 0,
top: 0,
width: width,
height: fontSize
};
lineWidths[lineWidths.length - 1] += width + labelOpts.padding;
});
minSize.height += totalHeight;
} else {
var vPadding = labelOpts.padding;
var columnWidths = me.columnWidths = [];
var columnHeights = me.columnHeights = [];
var totalWidth = labelOpts.padding;
var currentColWidth = 0;
var currentColHeight = 0;
helpers.each(me.legendItems, function(legendItem, i) {
var boxWidth = getBoxWidth(labelOpts, fontSize);
var itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
// If too tall, go to new column
if (i > 0 && currentColHeight + fontSize + 2 * vPadding > minSize.height) {
totalWidth += currentColWidth + labelOpts.padding;
columnWidths.push(currentColWidth); // previous column width
columnHeights.push(currentColHeight);
currentColWidth = 0;
currentColHeight = 0;
}
// Get max width
currentColWidth = Math.max(currentColWidth, itemWidth);
currentColHeight += fontSize + vPadding;
// Store the hitbox width and height here. Final position will be updated in `draw`
hitboxes[i] = {
left: 0,
top: 0,
width: itemWidth,
height: fontSize
};
});
totalWidth += currentColWidth;
columnWidths.push(currentColWidth);
columnHeights.push(currentColHeight);
minSize.width += totalWidth;
}
me.width = minSize.width;
me.height = minSize.height;
},
afterFit: noop,
// Shared Methods
isHorizontal: function() {
return this.options.position === 'top' || this.options.position === 'bottom';
},
// Actually draw the legend on the canvas
draw: function() {
var me = this;
var opts = me.options;
var labelOpts = opts.labels;
var globalDefaults = defaults.global;
var defaultColor = globalDefaults.defaultColor;
var lineDefault = globalDefaults.elements.line;
var legendHeight = me.height;
var columnHeights = me.columnHeights;
var legendWidth = me.width;
var lineWidths = me.lineWidths;
if (!opts.display) {
return;
}
var rtlHelper = getRtlHelper(opts.rtl, me.left, me.minSize.width);
var ctx = me.ctx;
var fontColor = valueOrDefault(labelOpts.fontColor, globalDefaults.defaultFontColor);
var labelFont = helpers.options._parseFont(labelOpts);
var fontSize = labelFont.size;
var cursor;
// Canvas setup
ctx.textAlign = rtlHelper.textAlign('left');
ctx.textBaseline = 'middle';
ctx.lineWidth = 0.5;
ctx.strokeStyle = fontColor; // for strikethrough effect
ctx.fillStyle = fontColor; // render in correct colour
ctx.font = labelFont.string;
var boxWidth = getBoxWidth(labelOpts, fontSize);
var hitboxes = me.legendHitBoxes;
// current position
var drawLegendBox = function(x, y, legendItem) {
if (isNaN(boxWidth) || boxWidth <= 0) {
return;
}
// Set the ctx for the box
ctx.save();
var lineWidth = valueOrDefault(legendItem.lineWidth, lineDefault.borderWidth);
ctx.fillStyle = valueOrDefault(legendItem.fillStyle, defaultColor);
ctx.lineCap = valueOrDefault(legendItem.lineCap, lineDefault.borderCapStyle);
ctx.lineDashOffset = valueOrDefault(legendItem.lineDashOffset, lineDefault.borderDashOffset);
ctx.lineJoin = valueOrDefault(legendItem.lineJoin, lineDefault.borderJoinStyle);
ctx.lineWidth = lineWidth;
ctx.strokeStyle = valueOrDefault(legendItem.strokeStyle, defaultColor);
if (ctx.setLineDash) {
// IE 9 and 10 do not support line dash
ctx.setLineDash(valueOrDefault(legendItem.lineDash, lineDefault.borderDash));
}
if (labelOpts && labelOpts.usePointStyle) {
// Recalculate x and y for drawPoint() because its expecting
// x and y to be center of figure (instead of top left)
var radius = boxWidth * Math.SQRT2 / 2;
var centerX = rtlHelper.xPlus(x, boxWidth / 2);
var centerY = y + fontSize / 2;
// Draw pointStyle as legend symbol
helpers.canvas.drawPoint(ctx, legendItem.pointStyle, radius, centerX, centerY, legendItem.rotation);
} else {
// Draw box as legend symbol
ctx.fillRect(rtlHelper.leftForLtr(x, boxWidth), y, boxWidth, fontSize);
if (lineWidth !== 0) {
ctx.strokeRect(rtlHelper.leftForLtr(x, boxWidth), y, boxWidth, fontSize);
}
}
ctx.restore();
};
var fillText = function(x, y, legendItem, textWidth) {
var halfFontSize = fontSize / 2;
var xLeft = rtlHelper.xPlus(x, boxWidth + halfFontSize);
var yMiddle = y + halfFontSize;
ctx.fillText(legendItem.text, xLeft, yMiddle);
if (legendItem.hidden) {
// Strikethrough the text if hidden
ctx.beginPath();
ctx.lineWidth = 2;
ctx.moveTo(xLeft, yMiddle);
ctx.lineTo(rtlHelper.xPlus(xLeft, textWidth), yMiddle);
ctx.stroke();
}
};
var alignmentOffset = function(dimension, blockSize) {
switch (opts.align) {
case 'start':
return labelOpts.padding;
case 'end':
return dimension - blockSize;
default: // center
return (dimension - blockSize + labelOpts.padding) / 2;
}
};
// Horizontal
var isHorizontal = me.isHorizontal();
if (isHorizontal) {
cursor = {
x: me.left + alignmentOffset(legendWidth, lineWidths[0]),
y: me.top + labelOpts.padding,
line: 0
};
} else {
cursor = {
x: me.left + labelOpts.padding,
y: me.top + alignmentOffset(legendHeight, columnHeights[0]),
line: 0
};
}
helpers.rtl.overrideTextDirection(me.ctx, opts.textDirection);
var itemHeight = fontSize + labelOpts.padding;
helpers.each(me.legendItems, function(legendItem, i) {
var textWidth = ctx.measureText(legendItem.text).width;
var width = boxWidth + (fontSize / 2) + textWidth;
var x = cursor.x;
var y = cursor.y;
rtlHelper.setWidth(me.minSize.width);
// Use (me.left + me.minSize.width) and (me.top + me.minSize.height)
// instead of me.right and me.bottom because me.width and me.height
// may have been changed since me.minSize was calculated
if (isHorizontal) {
if (i > 0 && x + width + labelOpts.padding > me.left + me.minSize.width) {
y = cursor.y += itemHeight;
cursor.line++;
x = cursor.x = me.left + alignmentOffset(legendWidth, lineWidths[cursor.line]);
}
} else if (i > 0 && y + itemHeight > me.top + me.minSize.height) {
x = cursor.x = x + me.columnWidths[cursor.line] + labelOpts.padding;
cursor.line++;
y = cursor.y = me.top + alignmentOffset(legendHeight, columnHeights[cursor.line]);
}
var realX = rtlHelper.x(x);
drawLegendBox(realX, y, legendItem);
hitboxes[i].left = rtlHelper.leftForLtr(realX, hitboxes[i].width);
hitboxes[i].top = y;
// Fill the actual label
fillText(realX, y, legendItem, textWidth);
if (isHorizontal) {
cursor.x += width + labelOpts.padding;
} else {
cursor.y += itemHeight;
}
});
helpers.rtl.restoreTextDirection(me.ctx, opts.textDirection);
},
/**
* @private
*/
_getLegendItemAt: function(x, y) {
var me = this;
var i, hitBox, lh;
if (x >= me.left && x <= me.right && y >= me.top && y <= me.bottom) {
// See if we are touching one of the dataset boxes
lh = me.legendHitBoxes;
for (i = 0; i < lh.length; ++i) {
hitBox = lh[i];
if (x >= hitBox.left && x <= hitBox.left + hitBox.width && y >= hitBox.top && y <= hitBox.top + hitBox.height) {
// Touching an element
return me.legendItems[i];
}
}
}
return null;
},
/**
* Handle an event
* @private
* @param {IEvent} event - The event to handle
*/
handleEvent: function(e) {
var me = this;
var opts = me.options;
var type = e.type === 'mouseup' ? 'click' : e.type;
var hoveredItem;
if (type === 'mousemove') {
if (!opts.onHover && !opts.onLeave) {
return;
}
} else if (type === 'click') {
if (!opts.onClick) {
return;
}
} else {
return;
}
// Chart event already has relative position in it
hoveredItem = me._getLegendItemAt(e.x, e.y);
if (type === 'click') {
if (hoveredItem && opts.onClick) {
// use e.native for backwards compatibility
opts.onClick.call(me, e.native, hoveredItem);
}
} else {
if (opts.onLeave && hoveredItem !== me._hoveredItem) {
if (me._hoveredItem) {
opts.onLeave.call(me, e.native, me._hoveredItem);
}
me._hoveredItem = hoveredItem;
}
if (opts.onHover && hoveredItem) {
// use e.native for backwards compatibility
opts.onHover.call(me, e.native, hoveredItem);
}
}
}
});
function createNewLegendAndAttach(chart, legendOpts) {
var legend = new Legend({
ctx: chart.ctx,
options: legendOpts,
chart: chart
});
layouts.configure(chart, legend, legendOpts);
layouts.addBox(chart, legend);
chart.legend = legend;
}
module.exports = {
id: 'legend',
/**
* Backward compatibility: since 2.1.5, the legend is registered as a plugin, making
* Chart.Legend obsolete. To avoid a breaking change, we export the Legend as part of
* the plugin, which one will be re-exposed in the chart.js file.
* https://github.com/chartjs/Chart.js/pull/2640
* @private
*/
_element: Legend,
beforeInit: function(chart) {
var legendOpts = chart.options.legend;
if (legendOpts) {
createNewLegendAndAttach(chart, legendOpts);
}
},
beforeUpdate: function(chart) {
var legendOpts = chart.options.legend;
var legend = chart.legend;
if (legendOpts) {
helpers.mergeIf(legendOpts, defaults.global.legend);
if (legend) {
layouts.configure(chart, legend, legendOpts);
legend.options = legendOpts;
} else {
createNewLegendAndAttach(chart, legendOpts);
}
} else if (legend) {
layouts.removeBox(chart, legend);
delete chart.legend;
}
},
afterEvent: function(chart, e) {
var legend = chart.legend;
if (legend) {
legend.handleEvent(e);
}
}
};
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