Diff: UniGraphic/Graphics/TextDisplay.h

Revision:

0:fa952828e34c

Child:

1:47c996032a9e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/UniGraphic/Graphics/TextDisplay.h	Sun May 10 10:44:31 2020 +0000
@@ -0,0 +1,106 @@
+/* mbed TextDisplay Library Base Class
+ * Copyright (c) 2007-2009 sford
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * A common base class for Text displays
+ * To port a new display, derive from this class and implement
+ * the constructor (setup the display), character (put a character
+ * at a location), rows and columns (number of rows/cols) functions.
+ * Everything else (locate, printf, putc, cls) will come for free
+ *
+ * The model is the display will wrap at the right and bottom, so you can
+ * keep writing and will always get valid characters. The location is 
+ * maintained internally to the class to make this easy
+ */
+
+#ifndef MBED_TEXTDISPLAY_H
+#define MBED_TEXTDISPLAY_H
+
+#include "mbed.h"
+
+/** A common base class for Text displays
+*/
+class TextDisplay : public Stream {
+public:
+
+    // functions needing implementation in derived implementation class
+    // ----------------------------------------------------------------
+    /** Create a TextDisplay interface
+    * @param name The name used in the path to access the strean through the filesystem
+    */
+    TextDisplay(const char *name = NULL);
+
+    /** output a character at the given position
+    *
+    * @param column column where charater must be written
+    * @param  row where character must be written
+    * @param c the character to be written to the TextDisplay
+    * @note this method may be overridden in a derived class.
+    */
+    virtual void character(int column, int row, int c) = 0;
+
+    /** return number of rows on TextDisplay
+    * @result number of rows
+    * @note this method must be supported in the derived class.
+    */
+    virtual int rows() = 0;
+
+    /** return number of columns on TextDisplay
+    * @result number of columns
+    * @note this method must be supported in the derived class.
+    */
+    virtual int columns() = 0;
+    
+    // functions that come for free, but can be overwritten
+    // ----------------------------------------------------
+    /** redirect output from a stream (stoud, sterr) to  display
+    * @param stream stream that shall be redirected to the TextDisplay
+    * @note this method may be overridden in a derived class.
+    * @returns true if the claim succeeded.
+    */
+    virtual bool claim (FILE *stream);
+
+    /** clear the entire screen
+    * @note this method may be overridden in a derived class.
+    */
+    virtual void cls();
+
+    /** locate the cursor at a character position.
+    * Based on the currently active font, locate the cursor on screen.
+    * @note this method may be overridden in a derived class.
+    * @param column is the horizontal offset from the left side.
+    * @param row is the vertical offset from the top.
+    */
+    virtual void locate(int column, int row);
+
+    /** set the foreground color
+    * @note this method may be overridden in a derived class.
+    * @param color is color to use for foreground drawing.
+    */
+    virtual void foreground(uint16_t colour);
+
+    /** set the background color
+    * @note this method may be overridden in a derived class.
+    * @param color is color to use for background drawing.
+    */
+    virtual void background(uint16_t colour);
+
+    // putc (from Stream)
+    // printf (from Stream)
+    
+protected:
+
+    virtual int _putc(int value);
+    virtual int _getc();
+
+    // character location
+    int _column;
+    int _row;
+
+    // colours
+    volatile uint16_t _foreground;
+    volatile uint16_t _background;
+    char *_path;
+};
+
+#endif