TextDisplay.cpp

00001  //  ST7735 8 Bit SPI Library
00002  
00003 #include "TextDisplay.h"
00004 
00005 TextDisplay::TextDisplay(const char *name) : Stream(name){
00006     _row = 0;
00007     _column = 0;
00008     if (name == NULL) {
00009         _path = NULL;
00010     } else {
00011         _path = new char[strlen(name) + 2];
00012         sprintf(_path, "/%s", name);
00013     }
00014 }
00015     
00016 int TextDisplay::_putc(int value) {
00017     if(value == '\n') {
00018         _column = 0;
00019         _row++;
00020         if(_row >= rows()) {
00021             _row = 0;
00022         }
00023     } else {
00024         character(_column, _row, value);
00025         _column++;
00026         if(_column >= columns()) {
00027             _column = 0;
00028             _row++;
00029             if(_row >= rows()) {
00030                 _row = 0;
00031             }
00032         }
00033     }
00034     return value;
00035 }
00036 void TextDisplay::cls() {
00037     locate(0, 0);
00038     for(int i=0; i<columns()*rows(); i++) {
00039         putc(' ');
00040     }
00041 }
00042 void TextDisplay::locate(int column, int row) {
00043     _column = column;
00044     _row = row;
00045 }
00046 int TextDisplay::_getc() {
00047     return -1;
00048 }        
00049 void TextDisplay::foreground(uint16_t colour) {
00050     _foreground = colour;
00051 }
00052 void TextDisplay::background(uint16_t colour) {
00053     _background = colour;
00054 }
00055 bool TextDisplay::claim (FILE *stream) {
00056     if ( _path == NULL) {
00057         fprintf(stderr, "claim requires a name to be given in the instantioator of the TextDisplay instance!\r\n");
00058         return false;
00059     }
00060     if (freopen(_path, "w", stream) == NULL) {
00061         // Failed, should not happen
00062         return false;
00063     }
00064     // make sure we use line buffering
00065     setvbuf(stdout, NULL, _IOLBF, columns());
00066     return true;
00067 }