~aritra1911/ansi_anim

1fa5a0269b4ea8c78738372f36028d479f8e997a — Aritra Sarkar 2 years ago b597ee7
Restore cursor position
4 files changed, 32 insertions(+), 2 deletions(-)

M ansilib/inc/ansi/common.h
M ansilib/inc/ansi/cursor.h
M ansilib/src/ansi/cursor.c
M src/main.c
M ansilib/inc/ansi/common.h => ansilib/inc/ansi/common.h +1 -1
@@ 1,6 1,6 @@
#ifndef __ANSI_COMMON_H_
# define __ANSI_COMMON_H_

# define CSI "\x1b["
# define CSI "\x1b["    /* Control Sequence Introducer */

#endif  /* __ANSI_COMMON_H_ */

M ansilib/inc/ansi/cursor.h => ansilib/inc/ansi/cursor.h +1 -0
@@ 5,6 5,7 @@

typedef enum { LEFT, DOWN, UP, RIGHT } dir_t;

point_t get_cursor_pos(void);
void move_cursor(point_t);
void nudge_cursor(dir_t, uint32_t step);


M ansilib/src/ansi/cursor.c => ansilib/src/ansi/cursor.c +22 -0
@@ 1,10 1,32 @@
#include <unistd.h>
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>

#include <ansi/common.h>
#include <ansi/cursor.h>

point_t get_cursor_pos(void)
{
    char buf[16];
    point_t ret = { 0 };

    /* ESC[6n   request cursor position (reports as ESC[#;#R) */

    write(STDOUT_FILENO, CSI"6n", 4);
    if ( read(STDIN_FILENO, buf, 16) ) {

        uint32_t line, column;
        sscanf(buf, CSI"%"PRIu32"i;%"PRIu32"iR", &line, &column);

        ret.x = column;
        ret.y = line;
    }

    return ret;
}

void move_cursor(point_t pos)
{
    char buf[16];

M src/main.c => src/main.c +8 -1
@@ 4,6 4,7 @@
#include <termios.h>
#include <unistd.h>

#include <ansi/cursor.h>
#include <graphics/common.h>
#include <graphics/shapes.h>



@@ 68,7 69,13 @@ int main(void)
     * }
     */

    draw_rectangle((point_t) { 2, 2 }, 32, 16);
    /* save current cursor position */
    point_t orig_cursor_pos = get_cursor_pos();

    draw_rectangle((point_t) { 20, 40 }, 32, 16);

    /* Return to the original cursor position */
    move_cursor(orig_cursor_pos);

    while ( 1 ) {