draw_line.cpp

shows how to draw line in paint event using xtd::drawing::graphics::draw_line.

Windows

macOS

Gnome

#include <xtd/xtd>
 
namespace draw_line_example {
  class form1 : public form {
  public:
    form1() {
      text("Draw line example");
    }
    
  protected:
    void on_paint(paint_event_args& e) override {
      form::on_paint(e);
      
      auto solid_pen = pen {color::red, 5};
      e.graphics().draw_line(solid_pen, 10, e.clip_rectangle().height / 7, e.clip_rectangle().width - 20, e.clip_rectangle().height / 7);
      
      auto dot_pen = pen {color::green, 5};
      dot_pen.dash_style(drawing_2d::dash_style::dot);
      e.graphics().draw_line(dot_pen, 10, e.clip_rectangle().height / 7 * 2, e.clip_rectangle().width - 20, e.clip_rectangle().height / 7 * 2);
      
      auto dash_pen = pen {color::blue, 5};
      dash_pen.dash_style(drawing_2d::dash_style::dash);
      e.graphics().draw_line(dash_pen, 10, e.clip_rectangle().height / 7 * 3, e.clip_rectangle().width - 20, e.clip_rectangle().height / 7 * 3);
      
      auto dash_dot_pen = pen {color::yellow, 5};
      dash_dot_pen.dash_style(drawing_2d::dash_style::dash_dot);
      e.graphics().draw_line(dash_dot_pen, 10, e.clip_rectangle().height / 7 * 4, e.clip_rectangle().width - 20, e.clip_rectangle().height / 7 * 4);
      
      auto dash_dot_dot_pen = pen {color::cyan, 5};
      dash_dot_dot_pen.dash_style(drawing_2d::dash_style::dash_dot_dot);
      e.graphics().draw_line(dash_dot_dot_pen, 10, e.clip_rectangle().height / 7 * 5, e.clip_rectangle().width - 20, e.clip_rectangle().height / 7 * 5);
      
      auto custom_pen = pen {color::magenta, 5};
      custom_pen.dash_style(drawing_2d::dash_style::custom);
      custom_pen.dash_pattern({4, 1, 3, 2});
      e.graphics().draw_line(custom_pen, 10, e.clip_rectangle().height / 7 * 6, e.clip_rectangle().width - 20, e.clip_rectangle().height / 7 * 6);
    }
  };
}
 
auto main() -> int {
  application::run(draw_line_example::form1 {});
}