136 lines
4.8 KiB
C
136 lines
4.8 KiB
C
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/*
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*
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* ncursesdemo.c
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*
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* REFERENCES
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* https://tldp.org/HOWTO/pdf/NCURSES-Programming-HOWTO.pdf
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*
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* Hyperlinked man page - very useful
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* https://man.netbsd.org/curses.3
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*
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*/
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#include <ncurses.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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int main(int argc, char* argv[ ])
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{
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WINDOW* W = 0; /* Curses Window handle */
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int rowLimit, colLimit; /* Num of rows and columns in terminal window */
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int playerRow, playerCol; /* Player row-column position */
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int deltaRow, deltaCol; /* Change in row-column position based on key input */
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/* Initialize ncurses -- you will want to use the following settings */
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W = initscr(); /* Determine terminal type and initialize curses data structures */
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start_color(); /* Enable use of color with ncurses */
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cbreak(); /* Disable line buffering and make char inputs immediately accessible to program */
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noecho(); /* Disable echo printing of chars type by user */
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nodelay(W, true); /* Make getch( ) a non-blocking call */
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keypad(W, true); /* Enable keypad and arrow keys */
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curs_set(0); /* Set cursor to be invisible - 0 */
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getmaxyx(W, rowLimit, colLimit); /* Query terminal dimensions */
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/* Define color pallete foreground-background color pairs */
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/* PairID#, Foreground Color, Background Color */
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/* Foreground color == Background color ==> solid color block */
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init_pair(1, COLOR_BLACK, COLOR_BLACK); /* Black text on Black background */
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init_pair(2, COLOR_RED, COLOR_BLACK); /* Red text on Black background */
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init_pair(3, COLOR_WHITE, COLOR_BLUE); /* White text on Blue background */
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init_pair(4, COLOR_YELLOW, COLOR_YELLOW); /* Yellow text on Yellow background */
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/* Draw some obstacle */
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attron(COLOR_PAIR(2)); /* Turn on color attribute #2 */
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wmove(W, rowLimit/2, colLimit/2); /* Position cursor in middle of terminal window */
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waddch(W, '#'); /* Draw # symbol */
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attroff(COLOR_PAIR(2)); /* Turn off color attribute #2 */
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/* Initialize player movement variables */
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playerRow = rowLimit/4;
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playerCol = colLimit/4;
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deltaCol = 0;
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deltaRow = 0;
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/* Player movement loop */
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do
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{
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int kb = wgetch(W); /* Grab keypress */
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/* Support player movement via WASD, IJKL, and arrow keys */
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if (kb == 'a' || kb == 'j' || kb == KEY_LEFT)
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{
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/* Move Left */
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deltaCol = -1;
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deltaRow = 0;
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}
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else if (kb == 'd' || kb == 'l' || kb == KEY_RIGHT)
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{
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/* Move Right */
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deltaCol = 1;
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deltaRow = 0;
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}
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else if (kb == 'w' || kb == 'i' || kb == KEY_UP)
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{
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/* Move Up */
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deltaCol = 0;
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deltaRow = -1;
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}
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else if (kb == 's' || kb == 'k' || kb == KEY_DOWN)
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{
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/* Move Down */
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deltaCol = 0;
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deltaRow = 1;
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}
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else if (kb == 'q')
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{
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/* q to exit player movement loop */
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break;
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};
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/* Erase player from current position */
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/* An alternate option is to invoke clear() */
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/* which erases everything on the screen */
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/* If you comment out this code, the player will leave an onscreen trail */
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/* */
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/* Algorithm: */
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/* - Turn on color attribute #1 (solid block of background color) */
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/* - Position cursor */
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/* - Draw player symbol */
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/* - Turn off color attribute #1 */
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attron(COLOR_PAIR(1));
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wmove(W, playerRow, playerCol);
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waddch(W, 'P');
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attroff(COLOR_PAIR(1));
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/* Compute new player position without checking to see if new position is valid */
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playerRow = playerRow + deltaRow;
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playerCol = playerCol + deltaCol;
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/* Redraw player in new position */
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attron(COLOR_PAIR(3)); /* Turn on color attribute #3 */
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wmove(W, playerRow, playerCol); /* Position cursor */
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waddch(W, 'P'); /* Draw player symbol */
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attroff(COLOR_PAIR(3)); /* Turn off color attribute #3 */
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/* Zero offsets prior to next key press */
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deltaRow = 0;
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deltaCol = 0;
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wrefresh(W); /* Refresh ncurses window */
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} while (true); /* Repeat until user selects q to quit */
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endwin(); /* Terminate ncurses window -- very important */
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return 0;
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}
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