javascript - Calculating line coordinates in Fabric.js -


i developing self graphing program draws binary tree using fabric.js. far have added draw node functions , working on drawing links between nodes, coordinates isn't getting calculated properly. can me point out error is? function(node1,node2,angle) draws node2 @ 200pixels away node1 @ angle passed. found start points of line following same method founded circle center adding circle's radius 20 in case instead of 200 pixels. end points calculated subtracting 20 200 , hence using value 180. code wrote:

code:

function addnode(node1,node2,angle) {     var intialx=parseint(node1.get('left'));     var initialy=parseint(node1.get('top'));      if(angle<180)     {           var pointx =math.abs(math.cos(angle*math.pi/180)*200+intialx);         var pointy=math.abs(math.sin(angle*math.pi/180)*200-initialy);         var initiallinex=math.abs(math.cos(angle*math.pi/180)*20+intialx);         var initialliney=math.abs(math.sin(angle*math.pi/180)*20-initialy);         var finallinex=math.abs(math.cos(angle*math.pi/180)*180+intialx);         var finalliney=math.abs(math.sin(angle*math.pi/180)*180-initialy);    }    else    {        var pointx =math.abs(math.cos(angle*math.pi/180)*200+intialx);        var pointy=math.abs(math.sin(angle*math.pi/180)*200+initialy);        var initiallinex=math.abs(math.cos(angle*math.pi/180)*20+intialx);        var initialliney=math.abs(math.sin(angle*math.pi/180)*20+initialy);        var finallinex=math.abs(math.cos(angle*math.pi/180)*180+intialx);        var finalliney=math.abs(math.sin(angle*math.pi/180)*180+initialy);     }      var x=new fabric.circle({ radius:20,originx: 'center', originy: 'center',fill:'red'});     var value1=string(node2);     var text= new fabric.text(value1, {fontsize: 10, originx: 'center', originy: 'center'});     var group = new fabric.group([ x, text ], {left:pointx, top: pointy, angle:0});     canvas.add(group);     canvas.add(new fabric.line([initiallinex, initialliney, finallinex, finalliney], {            stroke: 'red'     }));     return group; }

output: enter image description here


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