Method drawTo

test/drawing_context_test.cpp:278–284

   private:
    void drawTo(const Surface& s) const override {
      DrawingContext dc(s);
      dc.draw(MyLine());
      dc.draw(MyLine(), 3, 2);
      dc.setTransformation(Transformation().scale(1, 3));
      dc.draw(MyLine(), 3, 4);
    }
  };

  FakeOffscreen<Argb4444> test_screen(10, 11, color::Black);