CTextMessageCapable.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2020, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */
#pragma once

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

namespace mrpt::opengl
{
/** Keeps a list of text messages which can be rendered to OpenGL contexts by
 * graphic classes.
 * \ingroup mrpt_opengl_grp
 */
class CTextMessageCapable
{
   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, updateTextMessage
     */
    void addTextMessage(
        const double x_frac, const double y_frac, const std::string& text,
        const size_t unique_index = 0,
        const TFontParams& fontParams = TFontParams());

    /** 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);

    struct DataPerText : mrpt::opengl::T2DTextData
    {
        mutable mrpt::opengl::CText::Ptr gl_text, gl_text_shadow;
        mutable bool gl_text_outdated = true;
    };

    struct TListTextMessages
    {
        std::map<size_t, DataPerText> messages;

        /** (re)generate all CText objects in the gl_text fields */
        void regenerateGLobjects() const;
    };

    const TListTextMessages& getTextMessages() const { return m_2D_texts; }

   protected:
    TListTextMessages m_2D_texts;

};  // end of CTextMessageCapable

}  // namespace mrpt::opengl