xeyes, but with ncurses

README.md

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+# neyes: ASCII art "xeyes" using ncurses and xterm mouse mouse
+
+![ASCII art "xeyes" using ncurses and xterm mouse mouse](screenshot.png)
+
+This was @phooky's bad idea.

neyes.c

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+/*
+ * neyes: an xeyes like program for your terminal.
+ * (c) 2020 Trammell Hudson <[email protected]>
+ *
+ * Derived from https://tldp.org/HOWTO/NCURSES-Programming-HOWTO/windows.html#WINDOWBASICS
+ */
+#include <curses.h>
+#include <stdio.h>
+
+WINDOW *
+create_newwin(
+	const int height,
+	const int width,
+	const int starty,
+	const int startx
+)
+{
+	WINDOW * const local_win = newwin(height, width, starty, startx);
+	box(local_win, 0 , 0); // default boarders
+	wrefresh(local_win);
+
+	return local_win;
+}
+
+void
+destroy_win(
+	WINDOW * local_win
+)
+{	
+	// erase the existing borders before deletion
+	wborder(local_win, ' ', ' ', ' ',' ',' ',' ',' ',' ');
+	wrefresh(local_win);
+	delwin(local_win);
+}
+
+void
+update_track(
+	WINDOW ** track,
+	const int h,
+	const int w,
+	const int cy,
+	const int cx,
+	const int ey,
+	const int ex
+)
+{
+	if (*track)
+		destroy_win(*track);
+
+	int dx = ex - cx;
+	int dy = ey - cy;
+
+	if (dx > w/2-4)
+		dx = w/2-4;
+	if (dx < -(w/2-3))
+		dx = -(w/2-3);
+
+	if (dy > h/2-2)
+		dy = h/2-2;
+	if (dy < -(h/2-3))
+		dy = -(h/2-3);
+
+	*track = create_newwin(3, 5, cy - 1 + dy, cx - 2 + dx);
+}
+
+int main(void)
+{
+	initscr();
+	cbreak();
+	noecho();
+
+	// Enables keypad mode, which also allows mouse events as KEY_MOUSE
+	keypad(stdscr, TRUE);
+
+	// Report all mouse events, not only clicks
+	mousemask(ALL_MOUSE_EVENTS | REPORT_MOUSE_POSITION, NULL);
+
+	// see http://www.xfree86.org/current/ctlseqs.html#Mouse
+	printf("\033[?1003h\n");
+	refresh();
+
+	// create two windows, one for each "eye"
+	const int h = LINES;
+	const int w = COLS;
+	const int eye_h = h - 3;
+	const int eye_w = w/2 - 4;
+	WINDOW * eye1 = create_newwin(eye_h, eye_w, 2, 2);
+	WINDOW * eye2 = create_newwin(eye_h, eye_w, 2, w/2 + 2);
+
+	const int eye1_cx = 2 + eye_w/2;
+	const int eye2_cx = w/2 + 2 + eye_w/2;
+	const int eye1_cy = h/2;
+	const int eye2_cy = h/2;
+	WINDOW * track1 = NULL; //create_newwin(5, 5, eye1_cx - 2, eye1_cy - 2);
+	WINDOW * track2 = NULL; //create_newwin(5, 5, eye2_cx - 2, eye2_cy - 2);
+
+	while(1)
+	{
+		const int c = wgetch(stdscr);
+
+		// Exit on space or newline
+		if (c == ' ' || c == '\n')
+			break;
+
+		if (c == ERR)
+			break;
+
+		if (c != KEY_MOUSE)
+			continue;
+
+		MEVENT event;
+		if (getmouse(&event) != OK)
+			break;
+
+		update_track(&track1, eye_h, eye_w, eye1_cy, eye1_cx, event.y, event.x);
+		update_track(&track2, eye_h, eye_w, eye2_cy, eye2_cx, event.y, event.x);
+	}
+
+	// Disable mouse movement events, as l = low
+	printf("\033[?1003l\n");
+
+	delwin(eye1);
+	delwin(eye2);
+	endwin();
+
+	return 0;
+}