From 9f7b1c5bb30b566a6015f7a9e27ccc7274868db6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=A2=A6=E5=AE=87?= <xtiqin@163.com>
Date: Sat, 17 Oct 2020 14:08:15 +0800
Subject: [PATCH] Draw random points

---
 L02NoSignal/CMakeLists.txt | 20 ++++++++++++
 L02NoSignal/main.c         | 67 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 87 insertions(+)
 create mode 100644 L02NoSignal/CMakeLists.txt
 create mode 100644 L02NoSignal/main.c

diff --git a/L02NoSignal/CMakeLists.txt b/L02NoSignal/CMakeLists.txt
new file mode 100644
index 0000000..6867d91
--- /dev/null
+++ b/L02NoSignal/CMakeLists.txt
@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.17)
+project(L02NoSignal C)
+
+set(CMAKE_C_STANDARD 11)
+
+add_compile_definitions(THREAD_SAFE)
+
+include_directories(
+        /usr/local/include/SDL2
+)
+
+link_directories(
+        /usr/local/lib
+)
+
+link_libraries(
+        SDL2
+)
+
+add_executable(L02NoSignal main.c)
\ No newline at end of file
diff --git a/L02NoSignal/main.c b/L02NoSignal/main.c
new file mode 100644
index 0000000..b97271c
--- /dev/null
+++ b/L02NoSignal/main.c
@@ -0,0 +1,67 @@
+#include <SDL.h>
+
+#define WIDTH 550
+#define HEIGHT 400
+
+void drawBackground(SDL_Renderer *renderer) {
+    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
+    SDL_Rect rect = {0, 0, WIDTH, HEIGHT};
+    SDL_RenderFillRect(renderer, &rect);
+}
+
+void drawScreen(struct SDL_Renderer *renderer) {
+    for (int x = 0; x < WIDTH; ++x) {
+        for (int y = 0; y < HEIGHT; ++y) {
+            SDL_SetRenderDrawColor(renderer, rand() % 255, rand() % 255, rand() % 255, 255);
+            SDL_RenderDrawPoint(renderer, x, y);
+        }
+    }
+}
+
+void draw(SDL_Renderer *renderer) {
+    drawBackground(renderer);
+    drawScreen(renderer);
+}
+
+int main() {
+    SDL_Window *win;
+    SDL_Renderer *renderer;
+    if (SDL_Init(SDL_INIT_VIDEO)) {
+        SDL_Log("Unable to init SLD: %s", SDL_GetError());
+        return 1;
+    }
+    win = SDL_CreateWindow(
+            "Hello World",
+            SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+            WIDTH, HEIGHT,
+            SDL_WINDOW_OPENGL
+    );
+    if (win == NULL) {
+        SDL_Log("Unable to create window: %s", SDL_GetError());
+        return 1;
+    }
+
+    renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
+    if (renderer == NULL) {
+        SDL_Log("Can not create renderer: %s", SDL_GetError());
+        return 1;
+    }
+
+    while (1) {
+        SDL_RenderClear(renderer);
+        draw(renderer);
+        SDL_RenderPresent(renderer);
+
+        SDL_Event event;
+        if (SDL_PollEvent(&event)) {
+            if (event.type == SDL_QUIT) {
+                break;
+            }
+        }
+    }
+
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(win);
+    SDL_Quit();
+    return 0;
+}