cytoscape/src/extensions/renderer/base/coord-ele-math/edge-projection.js

Graph theory (a.k.a. network) library for analysis and visualisation

import * as math from '../../../../math';

var BRp = {};

function pushBezierPts( r, edge, pts ){
  var qbezierAt = function( p1, p2, p3, t ){ return math.qbezierAt( p1, p2, p3, t ); };
  var _p = edge._private;
  var bpts = _p.rstyle.bezierPts;

  for( var i = 0; i < r.bezierProjPcts.length; i++ ){
    var p = r.bezierProjPcts[i];

    bpts.push( {
      x: qbezierAt( pts[0], pts[2], pts[4], p ),
      y: qbezierAt( pts[1], pts[3], pts[5], p )
    } );
  }
}

BRp.storeEdgeProjections = function( edge ){
  var _p = edge._private;
  var rs = _p.rscratch;
  var et = rs.edgeType;

  // clear the cached points state
  _p.rstyle.bezierPts = null;
  _p.rstyle.linePts = null;
  _p.rstyle.haystackPts = null;

  if( et === 'multibezier' ||  et === 'bezier' ||  et === 'self' ||  et === 'compound' ){
    _p.rstyle.bezierPts = [];

    for( var i = 0; i + 5 < rs.allpts.length; i += 4 ){
      pushBezierPts( this, edge, rs.allpts.slice( i, i + 6 ) );
    }
  } else if(  et === 'segments' ){
    var lpts = _p.rstyle.linePts = [];

    for( var i = 0; i + 1 < rs.allpts.length; i += 2 ){
      lpts.push( {
        x: rs.allpts[ i ],
        y: rs.allpts[ i + 1]
      } );
    }
  } else if( et === 'haystack' ){
    var hpts = rs.haystackPts;

    _p.rstyle.haystackPts = [
      { x: hpts[0], y: hpts[1] },
      { x: hpts[2], y: hpts[3] }
    ];
  }

  _p.rstyle.arrowWidth = this.getArrowWidth( edge.pstyle('width').pfValue, edge.pstyle( 'arrow-scale' ).value )
    * this.arrowShapeWidth;
};

BRp.recalculateEdgeProjections = function( edges ){
  this.findEdgeControlPoints( edges );
};

export default BRp;