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 point_t TextDisplay::locate(textloc_t column, textloc_t row)
00076 {
00077     point_t oldPt;
00078 
00079     oldPt.x = _column; oldPt.y = _row;
00080     INFO("locate(%d,%d)", column, row);
00081     _column = column;
00082     _row = row;
00083     return oldPt;
00084 }
00085 
00086 int TextDisplay::_getc()
00087 {
00088     return -1;
00089 }
00090 
00091 color_t TextDisplay::foreground(uint16_t color)
00092 {
00093     color_t oldColor = _foreground;
00094     //INFO("foreground(%4X)", color);
00095     _foreground = color;
00096     return oldColor;
00097 }
00098 
00099 color_t TextDisplay::background(uint16_t color)
00100 {
00101     color_t oldColor = _background;
00102     //INFO("background(%4X)", color);
00103     _background = color;
00104     return oldColor;
00105 }
00106 
00107 bool TextDisplay::claim(FILE *stream)
00108 {
00109     if ( _path == NULL) {
00110         fprintf(stderr, "claim requires a name to be given in the instantiator of the TextDisplay instance!\r\n");
00111         return false;
00112     }
00113     if (freopen(_path, "w", stream) == NULL) {
00114         return false;       // Failed, should not happen
00115     }
00116     // make sure we use line buffering
00117     setvbuf(stdout, NULL, _IOLBF, columns());
00118     return true;
00119 }
00120