gistfile1.js

var mX = ig.input.mouse.x,
                mY = ig.input.mouse.y,
                spawnX = this.pos.x + this.size.x/2,
                spawnY = this.pos.y + this.size.y/2,
                r = Math.atan2(mY - spawnY, mX - spawnX),
                directionX = Math.cos(r) * 50,
                directionY = Math.sin(r) * 50;



                ig.system.context.strokeStyle = 'rgba(0,255,0,.5)';
                ig.system.context.beginPath();
                ig.system.context.moveTo(spawnX,spawnY);
                ig.system.context.lineTo(mX, mY);
                ig.system.context.stroke();
                ig.system.context.beginPath();
                ig.system.context.strokeStyle = 'rgba(255,0,0,.5)';
                ig.system.context.moveTo(spawnX,spawnY);
                ig.system.context.lineTo(directionX, directionY);
                ig.system.context.stroke();