pad_demo.c

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#define _XOPEN_SOURCE_EXTENDED 1
#define _GNU_SOURCE 1
 
#include <notcurses/notcurses.h>
#include <unistd.h>
 
int main(void) {
    // 1. Initialize Notcurses
    struct notcurses_options opts = {
        .flags = NCOPTION_SUPPRESS_BANNERS,
    };
    struct notcurses *nc = notcurses_init(&opts, NULL);
    if (!nc)
        return 1;
 
    struct ncplane *stdn = notcurses_stdplane(nc);
    unsigned term_y, term_x;
    ncplane_dim_yx(stdn, &term_y, &term_x);
 
    struct ncplane_options plane_opts = {
        .y = 0,
        .x = 0,
        .rows = 100,
        .cols = 200,
    };
    struct ncplane *pad = ncplane_create(stdn, &plane_opts);
 
    uint64_t channels = 0;
    ncplane_set_fchannel(pad, 0x002244);
    ncplane_set_bchannel(pad, 0x000000);
    ncplane_set_base(pad, " ", 0, channels);
 
    for (int y = 0; y < 100; y += 5) {
        for (int x = 0; x < 200; x += 20) {
            ncplane_printf_yx(pad, y, x, "[Row %d, Col %d]", y, x);
        }
    }
 
    for (int i = 0; i <= 40; i++) {
        ncplane_move_yx(pad, -i, -(i * 2));
        notcurses_render(nc);
        usleep(100000); // 100ms delay
    }
 
    notcurses_stop(nc);
    return 0;
}
 
/* Key Implementation Details
 * Virtual Coordinates: The y and x positions in ncplane_options are relative to
 * the parent plane (stdn).
 * Negative Moving: To view lower or rightward sections of your large canvas,
 * pass negative coordinates to ncplane_move_yx. This slides the canvas up or
 * left behind the terminal viewport.
 * Automatic Clipping: You do not need to calculate intersection windows like
 * ncurses prefresh. Notcurses discards pixels outside the screen space
 * automatically during notcurses_render.
 */