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Directory : /data/letsfame/admin/vendor/assets/node_modules/Chart.js/src/plugins/

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Current File : /data/letsfame/admin/vendor/assets/node_modules/Chart.js/src/plugins/plugin.title.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 noop = helpers.noop;

defaults._set('global', {
	title: {
		display: false,
		fontStyle: 'bold',
		fullWidth: true,
		lineHeight: 1.2,
		padding: 10,
		position: 'top',
		text: '',
		weight: 2000         // by default greater than legend (1000) to be above
	}
});

/**
 * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
 */
var Title = Element.extend({
	initialize: function(config) {
		var me = this;
		helpers.extend(me, config);

		// Contains hit boxes for each dataset (in dataset order)
		me.legendHitBoxes = [];
	},

	// These methods are ordered by lifecycle. Utilities then follow.

	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: noop,
	afterBuildLabels: noop,

	//

	beforeFit: noop,
	fit: function() {
		var me = this;
		var valueOrDefault = helpers.valueOrDefault;
		var opts = me.options;
		var display = opts.display;
		var fontSize = valueOrDefault(opts.fontSize, defaults.global.defaultFontSize);
		var minSize = me.minSize;
		var lineCount = helpers.isArray(opts.text) ? opts.text.length : 1;
		var lineHeight = helpers.options.toLineHeight(opts.lineHeight, fontSize);
		var textSize = display ? (lineCount * lineHeight) + (opts.padding * 2) : 0;

		if (me.isHorizontal()) {
			minSize.width = me.maxWidth; // fill all the width
			minSize.height = textSize;
		} else {
			minSize.width = textSize;
			minSize.height = me.maxHeight; // fill all the height
		}

		me.width = minSize.width;
		me.height = minSize.height;

	},
	afterFit: noop,

	// Shared Methods
	isHorizontal: function() {
		var pos = this.options.position;
		return pos === 'top' || pos === 'bottom';
	},

	// Actually draw the title block on the canvas
	draw: function() {
		var me = this;
		var ctx = me.ctx;
		var valueOrDefault = helpers.valueOrDefault;
		var opts = me.options;
		var globalDefaults = defaults.global;

		if (opts.display) {
			var fontSize = valueOrDefault(opts.fontSize, globalDefaults.defaultFontSize);
			var fontStyle = valueOrDefault(opts.fontStyle, globalDefaults.defaultFontStyle);
			var fontFamily = valueOrDefault(opts.fontFamily, globalDefaults.defaultFontFamily);
			var titleFont = helpers.fontString(fontSize, fontStyle, fontFamily);
			var lineHeight = helpers.options.toLineHeight(opts.lineHeight, fontSize);
			var offset = lineHeight / 2 + opts.padding;
			var rotation = 0;
			var top = me.top;
			var left = me.left;
			var bottom = me.bottom;
			var right = me.right;
			var maxWidth, titleX, titleY;

			ctx.fillStyle = valueOrDefault(opts.fontColor, globalDefaults.defaultFontColor); // render in correct colour
			ctx.font = titleFont;

			// Horizontal
			if (me.isHorizontal()) {
				titleX = left + ((right - left) / 2); // midpoint of the width
				titleY = top + offset;
				maxWidth = right - left;
			} else {
				titleX = opts.position === 'left' ? left + offset : right - offset;
				titleY = top + ((bottom - top) / 2);
				maxWidth = bottom - top;
				rotation = Math.PI * (opts.position === 'left' ? -0.5 : 0.5);
			}

			ctx.save();
			ctx.translate(titleX, titleY);
			ctx.rotate(rotation);
			ctx.textAlign = 'center';
			ctx.textBaseline = 'middle';

			var text = opts.text;
			if (helpers.isArray(text)) {
				var y = 0;
				for (var i = 0; i < text.length; ++i) {
					ctx.fillText(text[i], 0, y, maxWidth);
					y += lineHeight;
				}
			} else {
				ctx.fillText(text, 0, 0, maxWidth);
			}

			ctx.restore();
		}
	}
});

function createNewTitleBlockAndAttach(chart, titleOpts) {
	var title = new Title({
		ctx: chart.ctx,
		options: titleOpts,
		chart: chart
	});

	layouts.configure(chart, title, titleOpts);
	layouts.addBox(chart, title);
	chart.titleBlock = title;
}

module.exports = {
	id: 'title',

	/**
	 * Backward compatibility: since 2.1.5, the title is registered as a plugin, making
	 * Chart.Title obsolete. To avoid a breaking change, we export the Title 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: Title,

	beforeInit: function(chart) {
		var titleOpts = chart.options.title;

		if (titleOpts) {
			createNewTitleBlockAndAttach(chart, titleOpts);
		}
	},

	beforeUpdate: function(chart) {
		var titleOpts = chart.options.title;
		var titleBlock = chart.titleBlock;

		if (titleOpts) {
			helpers.mergeIf(titleOpts, defaults.global.title);

			if (titleBlock) {
				layouts.configure(chart, titleBlock, titleOpts);
				titleBlock.options = titleOpts;
			} else {
				createNewTitleBlockAndAttach(chart, titleOpts);
			}
		} else if (titleBlock) {
			layouts.removeBox(chart, titleBlock);
			delete chart.titleBlock;
		}
	}
};

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