Complex Shape Selection On Canvas

I have a canvas with background image, now I need to draw virtual regions on that canvas for selecting some parts of the image. Currently I am using fabricjs to draw simple shapes

Solution 1:

if you want to make heart shape you can use these code

function heartshape()
      {

var path = new fabric.Path('M 272.70141,238.71731 \
    C 206.46141,238.71731 152.70146,292.4773 152.70146,358.71731  \
    C 152.70146,493.47282 288.63461,528.80461 381.26391,662.02535 \
    C 468.83815,529.62199 609.82641,489.17075 609.82641,358.71731 \
    C 609.82641,292.47731 556.06651,238.7173 489.82641,238.71731  \
    C 441.77851,238.71731 400.42481,267.08774 381.26391,307.90481 \
    C 362.10311,267.08773 320.74941,238.7173 272.70141,238.71731  \
    z ');    
var scale = 100 / path.width;
path.set({ left: 20, top: 0, scaleX: scale, scaleY: scale,  fill: 'red', });
canvas.add(path);
canvas.renderAll();
      }