TextDisplay.cpp

00001 /* mbed TextDisplay Display Library Base Class
00002  * Copyright (c) 2007-2009 sford
00003  * Released under the MIT License: http://mbed.org/license/mit
00004  */
00005  
00006 #include "../screen/TextDisplay.h"
00007 
00008 #include <cstdarg>
00009 
00010 TextDisplay::TextDisplay(const char *name){
00011     _row = 0;
00012     _column = 0;
00013 
00014     if (name == NULL) {
00015         _path = NULL;
00016     } else {
00017         _path = new char[strlen(name) + 2];
00018         sprintf(_path, "/%s", name);
00019     }
00020 }
00021     
00022 int TextDisplay::_putc(int value) {
00023     if(value == '\n') {
00024         _column = 0;
00025         _row++;
00026         if(_row >= rows()) {
00027             _row = 0;
00028         }
00029     } else {
00030         character(_column, _row, value);
00031         _column++;
00032         if(_column >= columns()) {
00033             _column = 0;
00034             _row++;
00035             if(_row >= rows()) {
00036                 _row = 0;
00037             }
00038         }
00039     }
00040     return value;
00041 }
00042 
00043 // crude cls implementation, should generally be overwritten in derived class
00044 void TextDisplay::cls() {
00045     locate(0, 0);
00046     for(int i=0; i<columns()*rows(); i++) {
00047         _putc(' ');
00048     }
00049 }
00050 
00051 void TextDisplay::set_font(const unsigned char * f) {
00052     font = f;
00053     if(font==NULL) {
00054         externalfont = 0;  // set display.font
00055         locate(0, 0);
00056     }    
00057     else{
00058         externalfont = 1;
00059         locate(0, 0);
00060     }
00061 }
00062 
00063 void TextDisplay::locate(int column, int row) {
00064     _column = column;
00065     _row = row;
00066     char_x = column;
00067     char_y = row;
00068 }
00069 
00070 int TextDisplay::_getc() {
00071     return -1;
00072 }
00073         
00074 void TextDisplay::foreground(uint16_t colour) {
00075     _foreground = colour;
00076 }
00077 
00078 void TextDisplay::background(uint16_t colour) {
00079     _background = colour;
00080 }
00081 
00082 void TextDisplay::printf(const char* format, ...) {
00083     char buffer[MAX_PRINTF_CHARS + 1] = { 0 };
00084     uint32_t iterator = 0;
00085     va_list args;
00086     va_start(args, format);
00087     vsprintf(buffer, format, args);
00088     va_end(args);
00089 
00090     while((buffer[iterator] != 0) && (iterator < MAX_PRINTF_CHARS)) {
00091         _putc(buffer[iterator++]);
00092     }
00093 }