From c7a0d69f5a47e341f6ae07abc1bc957c431db38b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=A2=A6=E5=AE=87?= <xtiqin@163.com>
Date: Sun, 18 Oct 2020 23:18:33 +0800
Subject: [PATCH] Update main.c

---
 L01HelloWorld/main.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/L01HelloWorld/main.c b/L01HelloWorld/main.c
index 079adef..3a6c666 100644
--- a/L01HelloWorld/main.c
+++ b/L01HelloWorld/main.c
@@ -3,23 +3,12 @@
 #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 drawRedRect(struct SDL_Renderer *renderer) {
+void draw(SDL_Renderer *renderer) {
     SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
     SDL_Rect rect = {0, 0, 100, 100};
     SDL_RenderFillRect(renderer, &rect);
 }
 
-void draw(SDL_Renderer *renderer) {
-    drawBackground(renderer);
-    drawRedRect(renderer);
-}
-
 int main() {
     SDL_Window *win;
     SDL_Renderer *renderer;
@@ -45,6 +34,8 @@ int main() {
     }
 
     while (1) {
+        SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
+        SDL_RenderClear(renderer);
         draw(renderer);
         SDL_RenderPresent(renderer);