libcaca-tutorial

Section: libcaca (3caca)
Updated: Tue Jan 26 2021
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NAME

libcaca-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 `pkg-config --libs --cflags caca` example.c -o example


 

 

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