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84 lines
2.7 KiB
84 lines
2.7 KiB
;(function() {
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'use strict';
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sigma.utils.pkg('sigma.svg.edges');
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/**
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* The curve edge renderer. It renders the node as a bezier curve.
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*/
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sigma.svg.edges.curve = {
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/**
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* SVG Element creation.
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*
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* @param {object} edge The edge object.
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* @param {object} source The source node object.
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* @param {object} target The target node object.
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* @param {configurable} settings The settings function.
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*/
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create: function(edge, source, target, settings) {
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var color = edge.color,
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prefix = settings('prefix') || '',
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edgeColor = settings('edgeColor'),
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defaultNodeColor = settings('defaultNodeColor'),
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defaultEdgeColor = settings('defaultEdgeColor');
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if (!color)
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switch (edgeColor) {
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case 'source':
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color = source.color || defaultNodeColor;
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break;
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case 'target':
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color = target.color || defaultNodeColor;
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break;
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default:
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color = defaultEdgeColor;
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break;
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}
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var path = document.createElementNS(settings('xmlns'), 'path');
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// Attributes
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path.setAttributeNS(null, 'data-edge-id', edge.id);
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path.setAttributeNS(null, 'class', settings('classPrefix') + '-edge');
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path.setAttributeNS(null, 'stroke', color);
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return path;
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},
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/**
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* SVG Element update.
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*
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* @param {object} edge The edge object.
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* @param {DOMElement} line The line DOM Element.
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* @param {object} source The source node object.
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* @param {object} target The target node object.
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* @param {configurable} settings The settings function.
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*/
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update: function(edge, path, source, target, settings) {
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var prefix = settings('prefix') || '';
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path.setAttributeNS(null, 'stroke-width', edge[prefix + 'size'] || 1);
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// Control point
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var cx = (source[prefix + 'x'] + target[prefix + 'x']) / 2 +
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(target[prefix + 'y'] - source[prefix + 'y']) / 4,
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cy = (source[prefix + 'y'] + target[prefix + 'y']) / 2 +
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(source[prefix + 'x'] - target[prefix + 'x']) / 4;
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// Path
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var p = 'M' + source[prefix + 'x'] + ',' + source[prefix + 'y'] + ' ' +
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'Q' + cx + ',' + cy + ' ' +
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target[prefix + 'x'] + ',' + target[prefix + 'y'];
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// Updating attributes
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path.setAttributeNS(null, 'd', p);
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path.setAttributeNS(null, 'fill', 'none');
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// Showing
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path.style.display = '';
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return this;
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}
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};
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})();
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