From 6383a35cc5243acaecb20f1f84039c3454111647 Mon Sep 17 00:00:00 2001
From: Mal <oliver-bunert@posteo.de>
Date: Sun, 12 Jun 2022 16:06:02 +0200
Subject: [PATCH] Init

---
 .gitignore |   1 +
 Makefile   |   3 +
 coderain.c | 189 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 193 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 coderain.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3ad8a7c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+coderain
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..623f7a6
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,3 @@
+coderain: coderain.c
+	gcc -o coderain coderain.c -lncurses
+
diff --git a/coderain.c b/coderain.c
new file mode 100644
index 0000000..65876f5
--- /dev/null
+++ b/coderain.c
@@ -0,0 +1,189 @@
+#include <ncurses.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdbool.h>
+
+#define CHAR_COUNT 17
+
+#define COLOR_LIGHT_GREEN 8
+#define COLOR_MID_GREEN 9
+#define COLOR_DARK_GREEN 10
+#define COLOR_BLACK_GREEN 11
+
+#define WHITE 1
+#define LIGHT_GREEN 2
+#define MID_GREEN 3
+#define DARK_GREEN 4
+#define BLACK_GREEN 5
+
+
+const char CHARS[] = "!$%&?#@Y0123456789";
+
+
+struct Cursor {
+	int x;
+	int y;
+	int speed;
+	int length;
+	char string[256];
+	bool is_expanding;
+	bool is_active;
+};
+
+
+int get_random_number(int max_number)
+{
+	double index = (rand() / (double)RAND_MAX) * max_number;
+
+	return (int)index % max_number;
+}
+
+
+char get_random_char()
+{
+	return CHARS[get_random_number(CHAR_COUNT)];
+}
+
+
+void generate_random_string(char * string, int length)
+{
+	int index = 0;
+
+	for (int c = 0; c < length; c++) {
+		string[c] = get_random_char();
+		index = c;
+	}
+
+	string[index + 1] = '\0';
+}
+
+
+void print_with_color(char c, int x, int y, int color_pair)
+{
+	attron(COLOR_PAIR(color_pair));
+	mvaddch(y, x, c);
+	attroff(COLOR_PAIR(color_pair));
+}
+
+
+void draw_cursor(struct Cursor * cursor, int * screen_height)
+{
+	print_with_color(cursor->string[cursor->y], cursor->x, cursor->y, WHITE);
+
+	if (cursor->y > 0) {
+		print_with_color(cursor->string[cursor->y - 1], cursor->x, cursor->y - 1, LIGHT_GREEN);
+	}
+
+	++cursor->y;
+
+	/*
+	if (cursor->y > 4 && cursor->length > 4 && get_random_number(100) > 90) {
+		char random_char = get_random_char();
+		int char_index = cursor->y - get_random_number(cursor->length - 4);
+
+		cursor->string[char_index] = random_char;
+	}
+	*/
+
+	if (cursor->is_expanding) {
+		++cursor->length;
+
+		if (cursor->length > *screen_height * 0.1) {
+			cursor->is_expanding = get_random_number(10) > 1;
+		}
+	} else {
+		mvaddch(cursor->y - cursor->length - 4, cursor->x, ' ');
+		print_with_color(cursor->string[cursor->y - cursor->length], cursor->x, cursor->y - cursor->length - 3, BLACK_GREEN);
+		print_with_color(cursor->string[cursor->y - cursor->length], cursor->x, cursor->y - cursor->length - 2, DARK_GREEN);
+		print_with_color(cursor->string[cursor->y - cursor->length + 1], cursor->x, cursor->y - cursor->length - 1, MID_GREEN);
+	}
+
+	if (cursor->y > *screen_height + cursor->length + 3) {
+		cursor->length = 0;
+		cursor->y = 0;
+		cursor->is_active = false;
+		cursor->is_expanding = true;
+	}
+}
+
+
+void control_cursor(struct Cursor * cursor, int * screen_height)
+{
+	if (cursor->is_active) {
+		draw_cursor(cursor, screen_height);
+	} else {
+		cursor->is_active = get_random_number(*screen_height) > *screen_height * 0.5;
+
+		if (cursor->is_active) {
+			generate_random_string(cursor->string, *screen_height + 4);
+		}
+	}
+}
+
+
+int main()
+{
+	int screen_width = 0;
+	int screen_height = 0;
+
+	srand(time(NULL));
+
+	initscr();
+
+	if (!has_colors()) {
+		printf("Your shell does not support colors!\n");
+		return 1;
+	}
+
+	getmaxyx(stdscr, screen_height, screen_width);
+
+	struct Cursor cursors[screen_width];
+
+	for (int c = 0; c < screen_width; c++) {
+		struct Cursor cursor;
+
+		cursor.x = c;
+		cursor.y = -1 * get_random_number(screen_height);
+		cursor.speed = 0;
+		cursor.length = 0;
+		cursor.is_active = false;
+		cursor.is_expanding = true;
+
+		cursors[c] = cursor;
+	}
+
+	cbreak();
+	curs_set(0);
+	noecho();
+	keypad(stdscr, 1);
+	start_color();
+
+	init_color(COLOR_WHITE, 1000, 1000, 1000);
+	init_color(COLOR_LIGHT_GREEN, 500, 1000, 500);
+	init_color(COLOR_MID_GREEN, 0, 600, 0);
+	init_color(COLOR_DARK_GREEN, 0, 200, 0);
+	init_color(COLOR_BLACK_GREEN, 0, 50, 0);
+
+
+	init_pair(WHITE, COLOR_WHITE, COLOR_BLACK);
+	init_pair(LIGHT_GREEN, COLOR_LIGHT_GREEN, COLOR_BLACK);
+	init_pair(MID_GREEN, COLOR_MID_GREEN, COLOR_BLACK);
+	init_pair(DARK_GREEN, COLOR_DARK_GREEN, COLOR_BLACK);
+	init_pair(BLACK_GREEN, COLOR_DARK_GREEN, COLOR_BLACK);
+
+	while (true) {
+		for (int c = 0; c < screen_width; c++) {
+			control_cursor(&cursors[c], &screen_height);
+		}
+
+		refresh();
+
+		usleep(90000);
+	}
+
+	endwin();
+
+	return 0;
+}