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{**
 * plugins/blocks/KeywordCloud/block.tpl
 *
 * Copyright (c) 2014-2018 Simon Fraser University
 * Copyright (c) 2003-2018 John Willinsky
 * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
 *
 * Common site sidebar menu -- keywords cloud.
 *
 *}

<div class="pkp_block block_Keywordcloud">
	<h2 class="title">{translate key="plugins.block.keywordCloud.title"}</h2>
	<div class="content" id='wordcloud'></div>

	<script>
		function randomColor() {ldelim}
			var cores = ['#1f77b4', '#ff7f0e', '#2ca02c', '#d62728', '#9467bd', '#8c564b', '#e377c2', '#7f7f7f', '#bcbd22', '#17becf'];
			return cores[Math.floor(Math.random()*cores.length)];
		{rdelim}

		{if $keywords}
			document.addEventListener("DOMContentLoaded", function() {ldelim}
				var keywords = {$keywords};
				var totalWeight = 0;
				var width = 300;
				var height = 200;
				var transitionDuration = 200;	
				var length_keywords = keywords.length;
				var layout = d3.layout.cloud();

				layout.size([width, height])
					.words(keywords)
					.fontSize(function(d)
					{ldelim}
						return fontSize(+d.size);
					{rdelim})
					.on('end', draw);
				
				var svg = d3.select("#wordcloud").append("svg")
					.attr("viewBox", "0 0 " + width + " " + height)	
					.attr("width", '100%');		
				
				function update() {ldelim}
					var words = layout.words();
					fontSize = d3.scaleLinear().range([16, 34]);
					if (words.length) {ldelim}
						fontSize.domain([+words[words.length - 1].size || 1, +words[0].size]);
					{rdelim}
				{rdelim}
				
				keywords.forEach(function(item,index){ldelim}totalWeight += item.size;{rdelim});

				update();

				function draw(words, bounds) {ldelim}
					var w = layout.size()[0],
						h = layout.size()[1];

					scaling = bounds
						? Math.min(
							w / Math.abs(bounds[1].x - w / 2),
							w / Math.abs(bounds[0].x - w / 2),
							h / Math.abs(bounds[1].y - h / 2),
							h / Math.abs(bounds[0].y - h / 2),
						) / 2
						: 1;

					svg
					.append("g")
					.attr(
						"transform",
						"translate(" + [w >> 1, h >> 1] + ")scale(" + scaling + ")",
					)
					.selectAll("text")
						.data(words)
					.enter().append("text")
						.style("font-size", function(d) {ldelim} return d.size + "px"; {rdelim})
						.style("font-family", 'serif')
						.style("fill", randomColor)
						.style('cursor', 'pointer')
						.style('opacity', 0.7)
						.attr('class', 'keyword')
						.attr("text-anchor", "middle")
						.attr("transform", function(d) {ldelim}
							return "translate(" + [d.x, d.y] + ")rotate(" + d.rotate + ")";
						{rdelim}) 
						.text(function(d) {ldelim} return d.text; {rdelim})
						.on("click", function(d, i){ldelim}
							window.location = "{url router=$smarty.const.ROUTE_PAGE page="search" query="QUERY_SLUG"}".replace(/QUERY_SLUG/, encodeURIComponent(''+d.text+''));
						{rdelim})
						.on("mouseover", function(d, i) {ldelim}
							d3.select(this).transition()
								.duration(transitionDuration)
								.style('font-size',function(d) {ldelim} return (d.size + 3) + "px"; {rdelim})
								.style('opacity', 1);
						{rdelim})
						.on("mouseout", function(d, i) {ldelim}
							d3.select(this).transition()
								.duration(transitionDuration)
								.style('font-size',function(d) {ldelim} return d.size + "px"; {rdelim})
								.style('opacity', 0.7);
						{rdelim})
						.on('resize', function() {ldelim} update() {rdelim});
				{rdelim}

				layout.start();

			{rdelim});
		{/if}
	</script>
</div>