To reference or cite the objects present in the Software Heritage archive, permalinks based on SoftWare Heritage persistent IDentifiers (SWHIDs) must be used instead of copying and pasting the url from the address bar of the browser (as there is no guarantee the current URI scheme will remain the same over time).
Select below a type of object currently browsed in order to display its associated SWHID and permalink.
Merge pull request #114 from dmalec/UPDATE-PACKAGES-ON-LINUX-ACTIONS
There are two main hooks in the original logo where we put our changes for the wx GUI. One of these was for the graphics. This system which was used was part of the exist logo method for implementing graphics on different platforms. If you look at the top of graphics.c, there are a whole group of #ifdef, #includes, checking for each platform. As can be seen, we included wxGraphics.h if HAVE_WX is defined. This macro is defined during configuration if the --wx option is enabled during configuration. All of the definitions in the header point to function definitions particular to our WX implementation. This right here is sufficient to take care of all of the turtle graphics functionality. All of the corresponding functions defined in this header are defined in wxTurtleGraphics.cpp The other main hook was for our terminal. There are only a few places where anything is done for this. Most of the I/O for the terminal is done through calls to putc and getc, so instead of calling these routines, we have them call getFromWX and printToScreen instead which are defined in wxMain.cpp. The files which call getc where we do this are files.c and parse.c. We define putc to be printToScreen in the header globals.h as they did for other platforms, but it is only used in parse.c. We also defined wx_fgets as a replacement for fgets which is called in coms.c and wrksp.c, as well as flushFile as a replacement for fflush called in a few files. Both of these are also defined in wxMain.cpp. By defining these basic I/O functions and the graphics functions, the original logo is basically untouched. The main graphics routines as mentioned before are in wxTurtleGraphics.cpp. Here, the class TurtleCanvas is defined. In this file, we have a bunch of extern "C" routines which are called from graphics.c. These post messages to the GUI thread and have operations handled for them in the TurtleCanvas class. Some of these are routines for drawing lines, getting the size of the current GUI screen, and other similar things. The Main terminal routines are defined in both wxMain.cpp and wxTerminal.cpp. Again, there are extern "C" routines defined in wxMain.cpp. The terminal printing function adds a character to printing buffer and signals the GUI to print it. Then the handling routine printText in the class wxTerminal in wxTerminal.cpp handles the actual drawing of the text to the GUI. Similarly, the GUI takes in all of the input entered by way of the onChar handler, and when an enter is pressed, it makes it available to the logo interpreter. When the interpreter calls getc, it retrieves a character from this available buffer. If nothing is available at the time, it is put to sleep and woken up by the GUI when something is made available.