TextDisplay.cpp

00001 // mbed TextDisplay Display Library Base Class
00002 // Copyright © 2007-2009 sford
00003 // Released under the MIT License: http://mbed.org/license/mit
00004 
00005 #include "TextDisplay.h"
00006 
00007 //#define DEBUG "Text"
00008 // ...
00009 // INFO("Stuff to show %d", var); // new-line is automatically appended
00010 //
00011 #if (defined(DEBUG) && !defined(TARGET_LPC11U24))
00012 #define INFO(x, ...) std::printf("[INF %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00013 #define WARN(x, ...) std::printf("[WRN %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00014 #define ERR(x, ...)  std::printf("[ERR %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00015 #else
00016 #define INFO(x, ...)
00017 #define WARN(x, ...)
00018 #define ERR(x, ...)
00019 #endif
00020 
00021 TextDisplay::TextDisplay(const char *name) : Stream(name)
00022 {
00023     _row = 0;
00024     _column = 0;
00025     _foreground = 0;
00026     _background = 0;
00027     if (name == NULL) {
00028         _path = NULL;
00029     } else {
00030         int len = strlen(name) + 2;
00031         _path = new char[len];
00032         snprintf(_path, len, "/%s", name);
00033     }
00034 }
00035 
00036 TextDisplay::~TextDisplay()
00037 {
00038     delete [] _path;
00039 }
00040 
00041 int TextDisplay::_putc(int value)
00042 {
00043     INFO("_putc(%d)", value);
00044     if(value == '\n') {
00045         _column = 0;
00046         _row++;
00047         if(_row >= rows()) {
00048             _row = 0;
00049         }
00050     } else {
00051         character(_column, _row, value);
00052         _column++;
00053         if(_column >= columns()) {
00054             _column = 0;
00055             _row++;
00056             if(_row >= rows()) {
00057                 _row = 0;
00058             }
00059         }
00060     }
00061     return value;
00062 }
00063 
00064 // crude cls implementation, should generally be overwritten in derived class
00065 RetCode_t TextDisplay::cls(uint16_t layers)
00066 {
00067     INFO("cls()");
00068     locate(0, 0);
00069     for(int i=0; i<columns()*rows(); i++) {
00070         putc(' ');
00071     }
00072     return noerror;
00073 }
00074 
00075 RetCode_t TextDisplay::locate(textloc_t column, textloc_t row)
00076 {
00077     INFO("locate(%d,%d)", column, row);
00078     _column = column;
00079     _row = row;
00080     return noerror;
00081 }
00082 
00083 int TextDisplay::_getc()
00084 {
00085     return -1;
00086 }
00087 
00088 RetCode_t TextDisplay::foreground(uint16_t color)
00089 {
00090     //INFO("foreground(%4X)", color);
00091     _foreground = color;
00092     return noerror;
00093 }
00094 
00095 RetCode_t TextDisplay::background(uint16_t color)
00096 {
00097     //INFO("background(%4X)", color);
00098     _background = color;
00099     return noerror;
00100 }
00101 
00102 bool TextDisplay::claim(FILE *stream)
00103 {
00104     if ( _path == NULL) {
00105         fprintf(stderr, "claim requires a name to be given in the instantiator of the TextDisplay instance!\r\n");
00106         return false;
00107     }
00108     if (freopen(_path, "w", stream) == NULL) {
00109         return false;       // Failed, should not happen
00110     }
00111     // make sure we use line buffering
00112     setvbuf(stdout, NULL, _IOLBF, columns());
00113     return true;
00114 }
00115