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65 lines
2.1 KiB
65 lines
2.1 KiB
;(function() {
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'use strict';
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sigma.utils.pkg('sigma.canvas.edgehovers');
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/**
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* This hover renderer will display the edge with a different color or size.
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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.edgehovers.curve =
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function(edge, source, target, context, settings) {
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var color = edge.color,
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prefix = settings('prefix') || '',
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size = settings('edgeHoverSizeRatio') * (edge[prefix + 'size'] || 1),
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count = edge.count || 0,
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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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cp = {},
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sSize = source[prefix + 'size'],
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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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cp = (source.id === target.id) ?
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sigma.utils.getSelfLoopControlPoints(sX, sY, sSize, count) :
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sigma.utils.getQuadraticControlPoint(sX, sY, tX, tY, count);
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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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if (settings('edgeHoverColor') === 'edge') {
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color = edge.hover_color || color;
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} else {
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color = edge.hover_color || settings('defaultEdgeHoverColor') || color;
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}
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context.strokeStyle = color;
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context.lineWidth = size;
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context.beginPath();
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context.moveTo(sX, sY);
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if (source.id === target.id) {
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context.bezierCurveTo(cp.x1, cp.y1, cp.x2, cp.y2, tX, tY);
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} else {
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context.quadraticCurveTo(cp.x, cp.y, tX, tY);
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}
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context.stroke();
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};
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})();
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