gistfile1.txt

        Vector2 GetMouseDirection(float distance) {
            Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            
            float xp = body.position.x;
            float yp = body.position.y;
            float xm = mousePosition.x;
            float ym = mousePosition.y;

            float a; float b; float angle;
            if (xm >= xp && ym >= yp) {
                a=xm-xp;
                b=ym-yp;
                angle = Mathf.Atan( b / a); 
            } else if (xm <= xp && ym >= yp) {
                a=xp-xm;
                b=ym-yp;  
                angle = Mathf.PI/2 - Mathf.Atan( b / a) + Mathf.PI/2;
            } else if (xm <= xp && ym <= yp) {
                a=xp-xm;
                b=yp-ym;                
                angle = Mathf.Atan( b / a) + Mathf.PI;
            } else {
                a=xm-xp;
                b=yp-ym;
                angle = Mathf.PI/2 - Mathf.Atan( b / a) + (Mathf.PI/2)*3;
            }
            angle = angle - Mathf.PI/2;
            float xr = Mathf.Sin(-angle) * distance;
            float yr = Mathf.Cos(-angle) * distance;
            Debug.DrawLine (body.position, mousePosition, Color.red, 0.05f, false);
            Debug.DrawLine (new Vector2(body.position.x + xr, body.position.y + yr), body.position, Color.green, 0.01f, false);

            Debug.DrawLine (new Vector2(body.position.x + xr-0.1f, body.position.y + yr-0.1f), new Vector2(body.position.x + xr+0.1f, body.position.y + yr-0.1f), Color.green, 0.01f, false);
            Debug.DrawLine (new Vector2(body.position.x + xr+0.1f, body.position.y + yr-0.1f), new Vector2(body.position.x + xr+0.1f, body.position.y + yr+0.1f), Color.green, 0.01f, false);
            Debug.DrawLine (new Vector2(body.position.x + xr+0.1f, body.position.y + yr+0.1f), new Vector2(body.position.x + xr-0.1f, body.position.y + yr+0.1f), Color.green, 0.01f, false);
            Debug.DrawLine (new Vector2(body.position.x + xr-0.1f, body.position.y + yr-0.1f), new Vector2(body.position.x + xr-0.1f, body.position.y + yr+0.1f), Color.green, 0.01f, false);


            return new Vector2(xr, yr);
        }