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#include <PString.h>
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#define MAX_MESSAGE_LENGTH 64
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#define MESSAGE_BUFFER_LEN 32
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namespace TextRenderer
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* Get singleton instance of text renderer.
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* Get the width, in pexels, of a message.
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* @return singleton instance
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* @param message_len the length of the message
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* @param scale taxt scaling factor
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static TextRenderer &get_instance();
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int get_width( int message_len, int scale );
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* Retrieve the PString that is used to render text with the intention of
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* changing it. This resets the text services.
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* Draw a column of pixels at pixel-offset x in the message.
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* @param message the message
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PString &get_pstring();
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* Call at the start of each frame.
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* Draw segment using automatic scrolling.
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void draw_scroll( int segment );
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* Transform segment in to display-space.
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* @return display-space segment
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int xform_segment( int segment );
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* Draw the specified column of pixels from the message
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* @param x pixel column to draw
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* Get a pointer to the character data in the font for a given
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* @param character to look-up
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* @param glyph where to store the glyph data
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void get_glyph( char c, char *glyph );
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/** the buffer for the message */
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char _message_buffer[ MAX_MESSAGE_LENGTH ];
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/** the current message */
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char _glyph_cache[ 8 ];
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/** the character the current glyph is for */
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char _glyph_cache_char;
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/** time last frame */
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unsigned long _last_millis;
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/** duration last frame (in case we can't calculate it this
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unsigned long _duration;
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/** scroll position (in segments ) */
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* @param message_len the length of the message (to save it being
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* @param x the pixel column of the message to draw
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* @param y_flip true to draw up-side down
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* @param y_shift shift the drawing up/down
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* @param scale taxt scaling factor
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void render( const char *message, int message_len, int x,
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bool y_flip, int y_shift, int scale );
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* Reset the output buffer.
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* Notify renderer that the output buffer will require rendering.
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* Output the output buffer (and reset the output buffer).
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* Get the font number in use.
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* Switch to the next font.