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50 lines
1.5 KiB
50 lines
1.5 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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var _root = this;
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// Initialize packages:
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sigma.utils = sigma.utils || {};
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/**
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* Return the control point coordinates for a quadratic bezier curve.
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*
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* @param {number} x1 The X coordinate of the start point.
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* @param {number} y1 The Y coordinate of the start point.
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* @param {number} x2 The X coordinate of the end point.
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* @param {number} y2 The Y coordinate of the end point.
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* @param {number} a Modifier for the amplitude of the curve.
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* @return {x,y} The control point coordinates.
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*/
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sigma.utils.getQuadraticControlPoint = function(x1, y1, x2, y2, a) {
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a = a || 0;
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return {
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x: (x1 + x2) / 2 + (y2 - y1) / (60 / (15 + a)),
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y: (y1 + y2) / 2 + (x1 - x2) / (60 / (15 + a))
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};
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};
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/**
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* Return the coordinates of the two control points for a self loop (i.e.
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* where the start point is also the end point) computed as a cubic bezier
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* curve.
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*
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* @param {number} x The X coordinate of the node.
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* @param {number} y The Y coordinate of the node.
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* @param {number} size The node size.
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* @param {number} a Modifier to the loop size.
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* @return {x1,y1,x2,y2} The coordinates of the two control points.
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*/
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sigma.utils.getSelfLoopControlPoints = function(x , y, size, a) {
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a = a || 0;
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return {
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x1: x - (size + a) * 7,
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y1: y,
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x2: x,
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y2: y + (size + a) * 7
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};
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};
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}).call(this);
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