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106 lines
3.2 KiB
106 lines
3.2 KiB
;(function(undefined) {
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'use strict';
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if (typeof sigma === 'undefined')
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throw 'sigma is not declared';
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// Initialize packages:
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sigma.utils.pkg('sigma.canvas.hovers');
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/**
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* This hover renderer will basically display the label with a background.
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*
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* @param {object} node The node object.
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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.hovers.def = function(node, context, settings) {
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var x,
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y,
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w,
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h,
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e,
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fontStyle = settings('hoverFontStyle') || settings('fontStyle'),
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prefix = settings('prefix') || '',
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size = node[prefix + 'size'],
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fontSize = (settings('labelSize') === 'fixed') ?
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settings('defaultLabelSize') :
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settings('labelSizeRatio') * size;
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// Label background:
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context.font = (fontStyle ? fontStyle + ' ' : '') +
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fontSize + 'px ' + (settings('hoverFont') || settings('font'));
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context.beginPath();
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context.fillStyle = settings('labelHoverBGColor') === 'node' ?
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(node.color || settings('defaultNodeColor')) :
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settings('defaultHoverLabelBGColor');
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if (node.label && settings('labelHoverShadow')) {
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context.shadowOffsetX = 0;
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context.shadowOffsetY = 0;
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context.shadowBlur = 8;
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context.shadowColor = settings('labelHoverShadowColor');
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}
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if (node.label && typeof node.label === 'string') {
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x = Math.round(node[prefix + 'x'] - fontSize / 2 - 2);
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y = Math.round(node[prefix + 'y'] - fontSize / 2 - 2);
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w = Math.round(
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context.measureText(node.label).width + fontSize / 2 + size + 7
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);
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h = Math.round(fontSize + 4);
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e = Math.round(fontSize / 2 + 2);
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context.moveTo(x, y + e);
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context.arcTo(x, y, x + e, y, e);
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context.lineTo(x + w, y);
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context.lineTo(x + w, y + h);
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context.lineTo(x + e, y + h);
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context.arcTo(x, y + h, x, y + h - e, e);
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context.lineTo(x, y + e);
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context.closePath();
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context.fill();
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context.shadowOffsetX = 0;
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context.shadowOffsetY = 0;
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context.shadowBlur = 0;
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}
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// Node border:
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if (settings('borderSize') > 0) {
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context.beginPath();
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context.fillStyle = settings('nodeBorderColor') === 'node' ?
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(node.color || settings('defaultNodeColor')) :
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settings('defaultNodeBorderColor');
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context.arc(
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node[prefix + 'x'],
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node[prefix + 'y'],
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size + settings('borderSize'),
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0,
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Math.PI * 2,
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true
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);
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context.closePath();
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context.fill();
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}
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// Node:
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var nodeRenderer = sigma.canvas.nodes[node.type] || sigma.canvas.nodes.def;
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nodeRenderer(node, context, settings);
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// Display the label:
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if (node.label && typeof node.label === 'string') {
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context.fillStyle = (settings('labelHoverColor') === 'node') ?
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(node.color || settings('defaultNodeColor')) :
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settings('defaultLabelHoverColor');
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context.fillText(
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node.label,
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Math.round(node[prefix + 'x'] + size + 3),
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Math.round(node[prefix + 'y'] + fontSize / 3)
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);
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}
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};
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}).call(this);
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