libcaca-tutorial(3caca) libcaca libcaca-tutorial(3caca)NAMElibcaca-tutorial - A libcaca tutorial First, a very simple working
program, to check for basic libcaca functionalities.
#include <caca.h>
int main(void)
{
caca_canvas_t *cv; caca_display_t *dp; caca_event_t ev;
dp = caca_create_display(NULL);
if(!dp) return 1;
cv = caca_get_canvas(dp);
caca_set_display_title(dp, 'Hello!');
caca_set_color_ansi(cv, CACA_BLACK, CACA_WHITE);
caca_put_str(cv, 0, 0, 'This is a message');
caca_refresh_display(dp);
caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, -1);
caca_free_display(dp);
return 0;
}
What does it do?
· Create a display. Physically, the display is either a window or a
context in a terminal (ncurses, slang) or even the whole screen
(VGA).
· Get the display's associated canvas. A canvas is the surface where
everything happens: writing characters, sprites, strings, images...
It is unavoidable. Here the size of the canvas is set by the display.
· Set the display's window name (only available in windowed displays,
does nothing otherwise).
· Set the current canvas colours to black background and white
foreground.
· Write the string 'This is a message' onto the canvas, using the
current colour pair.
· Refresh the display, causing the text to be effectively displayed.
· Wait for an event of type CACA_EVENT_KEY_PRESS.
· Free the display (release memory). Since it was created together with
the display, the canvas will be automatically freed as well.
You can then compile this code on an UNIX-like system using the
following commans (requiring pkg-config and gcc):
gcc <code>pkg-config --libs --cflags caca</code> example.c -o example
Version 0.99.beta18 Tue Jun 19 2012 libcaca-tutorial(3caca)
