agg canvas adapter

Draw Line

  context->begin_path();
  context->set_line_width(8);
  context->set_stroke_color(0.1, 0.1, 0.5, 0.8);
  context->move_to(30, 30);
  context->set_line_cap("round");
  context->line_to(100, 100);
  context->stroke();

Draw Rectangle

  context->set_line_width(2);
  context->rect(20, 20, 50, 50, 3);
  context->stroke();  
  context->fill_rect(220, 220, 60, 60);
  context->stroke_rect(30, 100, 60, 60);
  context->clear_rect(230, 230, 40, 40);

Transform

  context->stroke_rect(450,5,25,15);
  context->scale(2,2);
  context->stroke_rect(450,5,25,15);

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MIT License