From 777b15741d92810807a1f6decb19cf54a402041c Mon Sep 17 00:00:00 2001
From: ElnuDev <elnu@elnu.com>
Date: Thu, 3 Mar 2022 22:42:38 -0800
Subject: [PATCH] Implement crude Tetris

---
 src/Main.cpp | 116 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 112 insertions(+), 4 deletions(-)

diff --git a/src/Main.cpp b/src/Main.cpp
index c2fa060..23cd57b 100644
--- a/src/Main.cpp
+++ b/src/Main.cpp
@@ -1,10 +1,64 @@
 #include <SFML/Graphics.hpp>
+#include <SFML/Graphics/Color.hpp>
+#include <SFML/Graphics/RectangleShape.hpp>
+#include <SFML/System/Vector2.hpp>
+#include <iostream>
+#include <string.h>
+#include <array>
+
+class TileType {
+	public:
+		sf::Color color;
+		TileType(sf::Color _color) {
+			color = _color;
+		}
+};
+
+class BlockType {
+	public:
+		TileType* tile_type;
+		std::array<std::array<bool, 4>, 2> grid;
+		BlockType(TileType* _tile_type, const std::array<std::array<bool, 4>, 2>& _grid) {
+			tile_type = _tile_type;
+			grid = _grid;
+		}
+};
 
 int main()
 {
-	sf::RenderWindow window(sf::VideoMode(200, 200), "SFML works!");
-	sf::CircleShape shape(100.f);
-	shape.setFillColor(sf::Color::Green);
+	#define WINDOW_WIDTH 400
+	#define WINDOW_HEIGHT 400
+	sf::RenderWindow window(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "elnutris");
+	window.setFramerateLimit(8);
+
+	TileType white(sf::Color::White);
+	TileType red(sf::Color::Red);
+	TileType green(sf::Color::Green);
+	TileType blue(sf::Color::Blue);
+	TileType yellow(sf::Color::Yellow);
+	TileType magenta(sf::Color::Magenta);
+	TileType cyan(sf::Color::Cyan);
+
+	// https://stackoverflow.com/questions/12844475
+	BlockType i(&white, {{{{0, 0, 0, 0}}, {{1, 1, 1, 1}}}});
+	BlockType j(&red, {{{{1, 0, 0, 0}}, {{1, 1, 1, 0}}}});
+	BlockType l(&green, {{{{0, 0, 0, 0}}, {{1, 1, 1, 1}}}});
+	BlockType o(&blue, {{{{0, 1, 1, 0}}, {{0, 1, 1, 0}}}});
+	BlockType s(&yellow, {{{{0, 1, 1, 0}}, {{1, 1, 0, 0}}}});
+	BlockType t(&magenta, {{{{0, 1, 0, 0}}, {{1, 1, 1, 0}}}});
+	BlockType z(&cyan, {{{{1, 1, 0, 0}}, {{0, 1, 1, 0}}}});
+	BlockType block_types[] = {i, j, l, o, s, t, z};
+
+	auto current_block = &block_types[rand() % 7];;
+	auto current_block_position = sf::Vector2i(0, 0);
+
+	#define GRID_WIDTH 20
+	#define GRID_HEIGHT 20
+	TileType* grid[GRID_HEIGHT][GRID_WIDTH] = { nullptr };
+
+	int shape_width = WINDOW_WIDTH / GRID_WIDTH;
+	int shape_height = WINDOW_HEIGHT / GRID_HEIGHT;
+	sf::RectangleShape shape(sf::Vector2f(shape_width, shape_height));
 
 	while (window.isOpen())
 	{
@@ -16,7 +70,61 @@ int main()
 		}
 
 		window.clear();
-		window.draw(shape);
+
+		if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Left)) {
+			current_block_position.x--;
+		}
+		if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Right)) {
+			current_block_position.x++;
+		}
+
+		shape.setFillColor(current_block->tile_type->color);
+		bool landed = false;
+		for (int y = 0; y < 2; y++) {
+			for (int x = 0; x < 4; x++) {
+				if (!current_block->grid[y][x]) {
+					continue;
+				}
+				int global_x = x + current_block_position.x;
+				int global_y = y + current_block_position.y;
+				if (global_y == GRID_HEIGHT - 1 || grid[global_y + 1][global_x] != nullptr) {
+					landed = true;
+				}
+				shape.setPosition(global_x * shape_width, global_y * shape_height);
+				window.draw(shape);
+			}
+		}
+		if (landed) {
+			for (int y = 0; y < 2; y++) {
+				for (int x = 0; x < 4; x++) {
+					if (!current_block->grid[y][x]) {
+						continue;
+					}
+					int global_x = x + current_block_position.x;
+					int global_y = y + current_block_position.y;
+					grid[global_y][global_x] = current_block->tile_type;
+				}
+			}
+			landed = false;
+			current_block = &block_types[rand() % 7];
+			current_block_position = sf::Vector2i(0, 0);
+		} else {
+			current_block_position.y++;
+		}
+
+		for (int y = 0; y < GRID_HEIGHT; y++) {
+			for (int x = 0; x < GRID_WIDTH; x++) {
+				auto tile_type = grid[y][x];
+				if (tile_type == nullptr) {
+					// If tile_type is a nullptr (no block), continue
+					continue;
+				}
+				shape.setFillColor(tile_type->color);
+				shape.setPosition(x * shape_width, y * shape_height);
+				window.draw(shape);
+			}
+		}		
+
 		window.display();
 	}