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163
toh_visualizer.c
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163
toh_visualizer.c
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/*----------------------------------------------------------
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* HTBLA-Leonding / Class: n/a
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* ---------------------------------------------------------
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* Exercise Number: 09
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* Title: Tower of Hanoi Visualizer
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* Author: S. Schraml
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* Due Date: n/a
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* ----------------------------------------------------------
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* Description:
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* Implementation of ToH Visualizer.
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* ----------------------------------------------------------
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*/
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#include "toh_visualizer.h"
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <unistd.h>
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#include "config.h"
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/* The encapsulated visualizer data */
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struct VisData {
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bool disabled;
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unsigned short refresh_line_count;
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unsigned short disk_count;
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int offset;
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int board_oversize;
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int left_rod_pos;
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int middle_rod_pos;
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int right_rod_pos;
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int last_move_count;
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int total_move_count;
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char* last_msg;
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unsigned short last_disk_count_left;
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unsigned short last_disk_count_middle;
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unsigned short last_disk_count_right;
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};
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/* The visualizer instance */
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static struct VisData vis_data = {0};
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/* Provides the number output lines for a configured game. */
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static void _print_new_line() {
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vis_data.refresh_line_count++;
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printf("\n");
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}
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/* Prints the given disk on the given rod or a 'rod' marker if no disk is given */
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static void _print_centered_disk(Disk disk, int center) {
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char symbol = '|';
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int width = 1;
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/* determine disk properties */
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if (td_is_valid(disk)) {
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width = 2 * td_get_size(disk) - 1;
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symbol = '#';
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}
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printf("\033[%dG", center - (width / 2)); /* set the cursor to the left border of the disk */
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for (int c = 0; c < width; c++) {
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printf("%c", symbol);
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}
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}
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/* Prints the bottom line of the board. */
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static void _print_board() {
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if (vis_data.disk_count > 0) {
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printf("\033[2K"); /* clear current line */
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printf("\033[%dG", vis_data.offset); /* set cursor to end of offset */
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int board_width = vis_data.left_rod_pos + vis_data.right_rod_pos + 2 * vis_data.board_oversize;
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for (int i = 0; i < board_width; i++) {
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printf("=");
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}
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_print_new_line();
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}
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}
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/* Prints the status line */
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static void _print_status_line(unsigned int move_count) {
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printf("\033[2K"); /* clear current line */
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printf("\033[%dG", vis_data.offset); /* set cursor to end of offset */
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printf("Move %4u of %u", move_count, vis_data.total_move_count);
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_print_new_line();
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}
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/* Prints the message line */
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static void _print_message(char* msg) {
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printf("\033[2K"); /* clear current line */
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printf("\033[%dG", vis_data.offset); /* set cursor to end of offset */
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if (msg != 0) {
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printf("%s", msg);
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}
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_print_new_line();
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}
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/* Prints the game: disks and board */
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static void _print_game(TohBoard board, unsigned int move_count, char* msg) {
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printf("\033[%dA", vis_data.refresh_line_count); /* move cursor to the first line of the game output */
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vis_data.refresh_line_count = 0;
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_print_new_line(); /* print an empty heading line */
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for (int disk_idx = vis_data.disk_count; disk_idx >= 0; disk_idx--) {
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printf("\033[2K"); /* clear current line */
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int offset = vis_data.offset + vis_data.board_oversize;
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_print_centered_disk(tb_get_disk(board, LEFT, disk_idx), offset + vis_data.left_rod_pos);
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_print_centered_disk(tb_get_disk(board, MIDDLE, disk_idx), offset + vis_data.middle_rod_pos);
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_print_centered_disk(tb_get_disk(board, RIGHT, disk_idx), offset + vis_data.right_rod_pos);
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_print_new_line();
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}
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_print_board(vis_data.disk_count + 2);
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_print_status_line(move_count);
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_print_message(msg);
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_print_new_line(); /* blank line */
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}
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void toh_init_visualizer(unsigned short disk_count) {
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if (disk_count > 0) {
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vis_data.refresh_line_count = 0;
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vis_data.disk_count = disk_count;
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vis_data.total_move_count = pow(2, disk_count) - 1;
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vis_data.offset = VIS_BOARD_OFFSET;
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vis_data.board_oversize = 2;
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int rod_distance = 2 * disk_count - 1 + 2; /* width of the largest disk + 1 gap on each side */
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vis_data.left_rod_pos = rod_distance / 2 ;
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vis_data.middle_rod_pos = vis_data.left_rod_pos + rod_distance;
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vis_data.right_rod_pos = vis_data.middle_rod_pos + rod_distance;
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}
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}
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void toh_disable_visualizer(bool disable) {
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vis_data.disabled = disable;
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}
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void toh_visualize(TohBoard board, unsigned int move_count) {
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toh_visualize_with_msg(board, move_count, 0);
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}
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void toh_visualize_with_msg(TohBoard board, unsigned int move_count, char* msg) {
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vis_data.last_move_count = move_count;
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vis_data.last_msg = msg;
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if (!vis_data.disabled) {
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if (!tb_is_valid(board)) {
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printf("invalid board given!");
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} else {
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_print_game(board, move_count, msg);
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if (MOVE_DELAY > 0) {
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usleep(MOVE_DELAY * 100 * 1000);
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}
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}
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}
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}
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void toh_visualize_last() {
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bool disabled = vis_data.disabled;
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vis_data.disabled = false;
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TohBoard board = tb_get_board();
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toh_visualize_with_msg(board, vis_data.last_move_count, vis_data.last_msg);
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vis_data.disabled = disabled;
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}
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