From bd6b5006f814daca16afd3a15eebd02ef696624b Mon Sep 17 00:00:00 2001
From: Charles <sircharlesaze@gmail.com>
Date: Sat, 9 Nov 2019 14:48:33 +0100
Subject: Basic Game

Bird falls, game over if he touches the floor or a pipe.
Pipes are randomly generated.
---
 graphics.cpp | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 98 insertions(+), 2 deletions(-)

(limited to 'graphics.cpp')

diff --git a/graphics.cpp b/graphics.cpp
index 14134dd..a7deaad 100644
--- a/graphics.cpp
+++ b/graphics.cpp
@@ -1,4 +1,5 @@
 #include <iostream>
+#include <cstdlib>
 #include <SDL2/SDL.h>
 #include "graphics.hpp"
 
@@ -6,6 +7,13 @@
 #define WINDOW_X 20
 #define WINDOW_Y 20
 
+#define BIRD_H 20
+#define BIRD_W 20
+#define BIRD_FALL 1
+#define BIRD_JUMP 30
+
+#define PIPE_W 30
+
 Graphics::Graphics()
 {
 	window = NULL;
@@ -20,15 +28,29 @@ Graphics::Graphics()
 	if (renderer == NULL)
 		error_quit("renderer init");
 	running = true;
+	for (int i = 0; i < 640 + 100; i += 50)
+	{
+		PipePair ppair = generate_pipe_pair();
+		ppair.first.x = i;
+		ppair.second.x = i;
+		pipes.push_back(ppair.first);
+		pipes.push_back(ppair.second);
+	}
+	bird.h = BIRD_H;
+	bird.w = BIRD_W;
+	bird.x = 0;
+	bird.y = pipes.front().h + 10;
 }
 
 void Graphics::run()
 {
 	while (running)
 	{
-		event_handler();
-		// update(state);
 		SDL_Delay(10);
+		event_handler();
+		update();
+		if (is_gameover())
+			running = false;
 	}
 }
 
@@ -42,6 +64,71 @@ Graphics::~Graphics()
 		SDL_Quit();
 }
 
+void Graphics::update()
+{
+	SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+	SDL_RenderClear(renderer);
+	handle_pipes();
+	draw_pipes();
+	draw_bird();
+	bird.y += BIRD_FALL;
+	for (std::deque<SDL_Rect>::iterator it = pipes.begin(); it != pipes.end(); it++)
+		it->x -= 1;
+	SDL_RenderPresent(renderer);
+}
+
+void Graphics::draw_bird()
+{
+	SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
+	SDL_RenderFillRect(renderer, &bird);
+}
+
+void Graphics::draw_pipes()
+{
+	SDL_SetRenderDrawColor(renderer, 100, 100, 100, 255);
+	for (SDL_Rect p : pipes)
+		SDL_RenderFillRect(renderer, &p);
+}
+
+bool Graphics::is_gameover()
+{
+	for (SDL_Rect p : pipes)
+		if (SDL_HasIntersection(&p, &bird) == SDL_TRUE)
+			return true;
+	if (bird.y + bird.w >= 480)
+		return true;
+	return false;
+}
+
+void Graphics::handle_pipes()
+{
+	if (pipes.front().x + pipes.front().w > 0)
+		return ;
+	pipes.pop_front();
+	pipes.pop_front();
+	PipePair pipe_pair = generate_pipe_pair();
+	pipes.push_back(pipe_pair.first);
+	pipes.push_back(pipe_pair.second);
+}
+
+#define PIPE_GAP 250
+
+PipePair Graphics::generate_pipe_pair()
+{
+	PipePair ppair;
+
+	ppair.first.h = rand() % 150 + 140;
+	ppair.second.y = ppair.first.h + PIPE_GAP;
+
+	ppair.first.x = 610;
+	ppair.first.y = 0;
+	ppair.first.w = PIPE_W;
+	ppair.second.x = 610;
+	ppair.second.w = PIPE_W;
+	ppair.second.h = 480 - ppair.second.y;
+	return ppair;
+}
+
 void Graphics::event_handler()
 {
 	SDL_Event e;
@@ -52,6 +139,15 @@ void Graphics::event_handler()
 			case SDL_QUIT:
 				running = false;
 				break;
+			case SDL_KEYDOWN:
+				switch (e.key.keysym.sym)
+				{
+					case SDLK_SPACE:
+						if (bird.y + bird.h > 0)
+							bird.y -= BIRD_JUMP;
+						break;
+				}
+				break;
 		}
 }
 
-- 
cgit