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--- youtube:cpp-intro-033 [2024/02/28 18:26] – 削除 - 外部編集 (不明な日付) 127.0.0.1
+++ youtube:cpp-intro-033 [2024/02/29 11:52] (現在) – freemikan
@@ 行 1: / 行 1: @@
+====== Tetris Take 1 ======
+作成日: 2023-07-21 (金)
+[[https://youtu.be/hYy0KUMSmXY|初心者によるC++入門 #33 壁と床を描く]]
+{{:youtube:tetris_take1.png?400|}}
+===== main.cpp =====
+<file cpp>
+#include <SDL2/SDL.h>
+#include <iostream>
+void draw_rectangle(SDL_Renderer *renderer, SDL_Rect const &rect, SDL_Color const &fc, SDL_Color const &oc) {
+    SDL_SetRenderDrawColor(renderer, fc.r, fc.g, fc.b, fc.a);
+    SDL_RenderFillRect(renderer, &rect);
+    SDL_SetRenderDrawColor(renderer, oc.r, oc.g, oc.b, oc.a);
+    SDL_RenderDrawRect(renderer, &rect);
+}
+void draw_fence(SDL_Renderer *renderer, int a_width, int a_height, int c_width, int c_height) {
+        SDL_Rect rect{0, 0, c_width, c_height};
+        SDL_Color color{128, 128, 128, 255};
+        SDL_Color outline_color{255, 255, 255, 255};
+        // draw left wall
+        for (int i = 0; i < a_height; ++i) {
+            rect.x = 0;
+            rect.y = i * c_height;
+            draw_rectangle(renderer, rect, color, outline_color);
+        }
+        // draw right wall
+        for (int i = 0; i < a_height; ++i) {
+            rect.x = (a_width + 1) * c_width;
+            rect.y = i * c_height;
+            draw_rectangle(renderer, rect, color, outline_color);
+        }
+        // draw floor
+        for (int i = 0; i < a_width + 2; ++i) {
+            rect.x = i * c_width;
+            rect.y = a_height * c_height;
+            draw_rectangle(renderer, rect, color, outline_color);
+        }
+}
+int main(int argc, char **argv) {
+    int const ScreenWidth = 400;  // px
+    int const ScreenHeight = 510; // px
+    int const ArenaWidth = 10;    // cell count
+    int const ArenaHeight = 20;   // cell count
+    int const CellWidth = 24;     // px
+    int const CellHeight = 24;    // px
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        std::cerr << "Error: init SDL\n";
+        std::exit(1);
+    }
+    SDL_Window *window = SDL_CreateWindow(
+            "HelloSDL window",
+            SDL_WINDOWPOS_CENTERED,
+            SDL_WINDOWPOS_CENTERED,
+            ScreenWidth,
+            ScreenHeight,
+);
+    if (window == nullptr) {
+        std::cerr << "Error: create window\n";
+        std::exit(1);
+    }
+    SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
+    if (renderer == nullptr) {
+        std::cerr << "Error: create renderer\n";
+        std::exit(1);
+    }
+    bool running = true;
+    while (running) {
+        SDL_Event event;
+        while (SDL_PollEvent(&event)) {
+            if (event.type == SDL_QUIT) {
+                running = false;
+            }
+        }
+        SDL_SetRenderDrawColor(renderer, 100, 100, 255, 255);
+        SDL_RenderClear(renderer);
+        draw_fence(renderer, ArenaWidth, ArenaHeight, CellWidth, CellHeight);
+        SDL_RenderPresent(renderer);
+        SDL_Delay(1);
+    }
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+    return 0;
+}
+</file>
+===== Makefile =====
+<file makefile>
+SRCS = \
+	main.cpp
+OBJS = ${SRCS:%.cpp=%.o}
+DEPS = ${SRCS:%.cpp=%.d}
+EXECUTABLE = tetris.exe
+CXXFLAGS = -IC:\SDL2\include
+LDFLAGS = -LC:\SDL2\lib
+LDLIBS = -lmingw32 -lSDL2main -lSDL2
+.PHONY: all
+all: ${EXECUTABLE}
+${EXECUTABLE}: ${OBJS}
+	${CXX} -o $@ $^ ${LDFLAGS} ${LDLIBS}
+%.o: %.cpp
+	${CXX} -c -o $@ $< -MMD -MP ${CXXFLAGS}
+.PHONY: clean
+clean:
+	${RM} ${EXECUTABLE} ${OBJS} ${DEPS}
+-include ${DEPS}
+</file>
+''C:\SDL2''の部分は、SDLをインストールした場所を指定します。