CTextMessageCapable.h

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/* +---------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)               |
   |                          http://www.mrpt.org/                             |
   |                                                                           |
   | Copyright (c) 2005-2017, Individual contributors, see AUTHORS file        |
   | See: http://www.mrpt.org/Authors - All rights reserved.                   |
   | Released under BSD License. See details in http://www.mrpt.org/License    |
   +---------------------------------------------------------------------------+ */
#ifndef opengl_CTextMessageCapable_H
#define opengl_CTextMessageCapable_H


#include <mrpt/opengl/CRenderizable.h>
#include <mrpt/opengl/opengl_fonts.h>
#include <map>

namespace mrpt
{
        namespace opengl
        {
                /** Keeps a list of text messages which can be rendered to OpenGL contexts by graphic classes.
                  * \ingroup mrpt_opengl_grp
                  */
                class OPENGL_IMPEXP CTextMessageCapable
                {
                protected:
                        std::map<size_t,mrpt::opengl::T2DTextData>  m_2D_texts;

                        /** Renders the messages to the current opengl rendering context (to be called OUT of MRPT mrpt::opengl render() methods ).
                          *  (w,h) are the dimensions of the rendering area in pixels.
                          */
                        void render_text_messages(const int w, const int h) const;

                public:
                        void clearTextMessages();


                        /** Add 2D text messages overlapped to the 3D rendered scene. The string will remain displayed in the 3D window
                          *   until it's changed with subsequent calls to this same method, or all the texts are cleared with clearTextMessages().
                          *
                          *  \param x The X position, interpreted as absolute pixels from the left if X>=1, absolute pixels from the left if X<0 or as a width factor if in the range [0,1[.
                          *  \param y The Y position, interpreted as absolute pixels from the bottom if Y>=1, absolute pixels from the top if Y<0 or as a height factor if in the range [0,1[.
                          *  \param text The text string to display.
                          *  \param color The text color. For example: TColorf(1.0,1.0,1.0)
                          *  \param unique_index An "index" for this text message, so that subsequent calls with the same index will overwrite this text message instead of creating new ones.
                          *
                          *  You'll need to refresh the display manually with forceRepaint().
                          *
                          * \sa clearTextMessages
                          */
                        void addTextMessage(
                                const double x_frac,
                                const double y_frac,
                                const std::string &text,
                                const mrpt::utils::TColorf &color = mrpt::utils::TColorf(1.0,1.0,1.0),
                                const size_t unique_index = 0,
                                const mrpt::opengl::TOpenGLFont font = mrpt::opengl::MRPT_GLUT_BITMAP_TIMES_ROMAN_24
                                );

                        /// overload with more font parameters - refer to mrpt::opengl::gl_utils::glDrawText()
                        void addTextMessage(
                                const double x_frac,
                                const double y_frac,
                                const std::string &text,
                                const mrpt::utils::TColorf &color,
                                const std::string  &font_name,
                                const double  font_size,
                                const mrpt::opengl::TOpenGLFontStyle font_style = mrpt::opengl::NICE,
                                const size_t  unique_index = 0,
                                const double  font_spacing = 1.5,
                                const double  font_kerning = 0.1,
                                const bool has_shadow = false,
                                const mrpt::utils::TColorf &shadow_color = mrpt::utils::TColorf(0,0,0)
                                );

                        /** Just updates the text of a given text message, without touching the other parameters.
                          * \return false if given ID doesn't exist.
                          */
                        bool updateTextMessage(const size_t  unique_index, const std::string &text);

                }; // end of CTextMessageCapable

        } // end namespace
} // End of namespace

#endif