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77 lines
2.3 KiB
77 lines
2.3 KiB
;(function() {
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'use strict';
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sigma.utils.pkg('sigma.canvas.edges');
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/**
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* This method renders the edge as two parallel lines.
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*
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* @param {object} edge The edge object.
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* @param {object} source node The edge source node.
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* @param {object} target node The edge target node.
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* @param {CanvasRenderingContext2D} context The canvas context.
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* @param {configurable} settings The settings function.
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*/
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sigma.canvas.edges.parallel = function(edge, source, target, context, settings) {
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var color = edge.active ?
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edge.active_color || settings('defaultEdgeActiveColor') :
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edge.color,
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prefix = settings('prefix') || '',
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size = edge[prefix + 'size'] || 1,
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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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sX = source[prefix + 'x'],
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sY = source[prefix + 'y'],
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tX = target[prefix + 'x'],
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tY = target[prefix + 'y'],
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c,
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d,
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dist = sigma.utils.getDistance(sX, sY, tX, tY);
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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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// Intersection points of the source node circle:
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c = sigma.utils.getCircleIntersection(sX, sY, size, tX, tY, dist);
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// Intersection points of the target node circle:
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d = sigma.utils.getCircleIntersection(tX, tY, size, sX, sY, dist);
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context.save();
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if (edge.active) {
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context.strokeStyle = settings('edgeActiveColor') === 'edge' ?
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(color || defaultEdgeColor) :
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settings('defaultEdgeActiveColor');
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}
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else {
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context.strokeStyle = color;
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}
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context.lineWidth = size;
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context.beginPath();
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context.moveTo(c.xi, c.yi);
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context.lineTo(d.xi_prime, d.yi_prime);
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context.closePath();
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context.stroke();
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context.beginPath();
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context.moveTo(c.xi_prime, c.yi_prime);
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context.lineTo(d.xi, d.yi);
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context.closePath();
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context.stroke();
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context.restore();
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};
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})();
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