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linux sdl图形编程之helloworld.

news 2025/10/16 8:08:32

#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>

int main3(int argc, char* argv[]) {
// 初始化SDL
if(SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("SDL初始化失败: %s\n", SDL_GetError());
return -1;
}

// 初始化TTF字体库
if(TTF_Init() < 0) {
printf("TTF初始化失败: %s\n", TTF_GetError());
SDL_Quit();
return -1;
}

// 创建窗口
SDL_Window* window = SDL_CreateWindow("SDL Hello World",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
640, 480,
SDL_WINDOW_SHOWN);
if(!window) {
printf("窗口创建失败: %s\n", SDL_GetError());
TTF_Quit();
SDL_Quit();
return -1;
}

// 创建渲染器
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1,
SDL_RENDERER_ACCELERATED |
SDL_RENDERER_PRESENTVSYNC);
if(!renderer) {
printf("渲染器创建失败: %s\n", SDL_GetError());
SDL_DestroyWindow(window);
TTF_Quit();
SDL_Quit();
return -1;
}

// 加载字体
TTF_Font* font = TTF_OpenFont("/usr/share/fonts/truetype/freefont/FreeSans.ttf", 24);
if(!font) {
printf("字体加载失败: %s\n", TTF_GetError());
font = TTF_OpenFont("FreeSans.ttf", 24); // 尝试当前目录
if(!font) {
printf("备用字体加载失败\n");
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
TTF_Quit();
SDL_Quit();
return -1;
}
}

// 创建文本表面
SDL_Color white = {255, 255, 255, 255};
SDL_Surface* textSurface = TTF_RenderText_Solid(font, "Hello World!", white);
if(!textSurface) {
printf("文本表面创建失败: %s\n", SDL_GetError());
TTF_CloseFont(font);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
TTF_Quit();
SDL_Quit();
return -1;
}

// 创建纹理
SDL_Texture* textTexture = SDL_CreateTextureFromSurface(renderer, textSurface);
if(!textTexture) {
printf("纹理创建失败: %s\n", SDL_GetError());
SDL_FreeSurface(textSurface);
TTF_CloseFont(font);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
TTF_Quit();
SDL_Quit();
return -1;
}

// 获取文本尺寸
int textWidth = textSurface->w;
int textHeight = textSurface->h;
SDL_FreeSurface(textSurface);

// 设置文本位置
SDL_Rect textRect = {
(640 - textWidth) / 2,
(480 - textHeight) / 2,
textWidth,
textHeight
};

// 主循环
SDL_Event event;
int quit = 0;
while(!quit) {
while(SDL_PollEvent(&event)) {
if(event.type == SDL_QUIT) {
quit = 1;
}
}

// 清屏
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);

// 渲染文本
SDL_RenderCopy(renderer, textTexture, NULL, &textRect);

// 更新屏幕
SDL_RenderPresent(renderer);
}

// 清理资源
SDL_DestroyTexture(textTexture);
TTF_CloseFont(font);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
TTF_Quit();
SDL_Quit();

return 0;
}

#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>

int main4() {
// 初始化
if(SDL_Init(SDL_INIT_VIDEO) < 0) {
SDL_Log("SDL初始化失败: %s", SDL_GetError());
return -1;
}

if(TTF_Init() < 0) {
SDL_Log("TTF初始化失败: %s", TTF_GetError());
SDL_Quit();
return -1;
}

// 创建窗口和主Surface
SDL_Window* window = SDL_CreateWindow("SDL Surface Demo",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
640, 480, SDL_WINDOW_SHOWN);
if(!window) {
SDL_Log("窗口创建失败: %s", SDL_GetError());
TTF_Quit();
SDL_Quit();
return -1;
}

SDL_Surface* screenSurface = SDL_GetWindowSurface(window);

// 加载字体和渲染文本
TTF_Font* font = TTF_OpenFont("FreeSans.ttf", 24);
if(!font) font = TTF_OpenFont("/usr/share/fonts/truetype/freefont/FreeSans.ttf", 24);

if(font) {
SDL_Color white = {255, 255, 255};
SDL_Surface* textSurface = TTF_RenderText_Solid(font, "Hello World!", white);

if(textSurface) {
// 计算居中位置
SDL_Rect textRect = {
(screenSurface->w - textSurface->w) / 2,
(screenSurface->h - textSurface->h) / 2,
textSurface->w,
textSurface->h
};

// 主循环
SDL_Event e;
int running = 1;
while(running) {
while(SDL_PollEvent(&e)) {
if(e.type == SDL_QUIT) running = 0;
}

// 清屏（填充黑色）
SDL_FillRect(screenSurface, NULL,
SDL_MapRGB(screenSurface->format, 0, 0, 0));

// 绘制文本
SDL_BlitSurface(textSurface, NULL, screenSurface, &textRect);
SDL_UpdateWindowSurface(window);

SDL_Delay(16); // 约60FPS
}

SDL_FreeSurface(textSurface);
}
TTF_CloseFont(font);
}

// 清理资源
SDL_DestroyWindow(window);
TTF_Quit();
SDL_Quit();
return 0;
}

#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>

#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480

typedef struct {
SDL_Rect rect;
SDL_Color normalColor;
SDL_Color hoverColor;
SDL_Color pressedColor;
int isPressed;
int isHovered;
} Button;

void renderButton(SDL_Renderer* renderer, Button* button) {
SDL_Color currentColor = button->normalColor;
if (button->isPressed) {
currentColor = button->pressedColor;
} else if (button->isHovered) {
currentColor = button->hoverColor;
}

SDL_SetRenderDrawColor(renderer, currentColor.r, currentColor.g, currentColor.b, 255);
SDL_RenderFillRect(renderer, &button->rect);

// 绘制边框
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderDrawRect(renderer, &button->rect);
}

int main(int argc, char* argv[]) {
SDL_Init(SDL_INIT_VIDEO);
TTF_Init();

SDL_Window* window = SDL_CreateWindow("SDL Button Demo",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
SCREEN_WIDTH, SCREEN_HEIGHT,
SDL_WINDOW_SHOWN);
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1,
SDL_RENDERER_ACCELERATED);

// 创建按钮
Button myButton = {
.rect = {SCREEN_WIDTH/2 - 100, SCREEN_HEIGHT/2 - 50, 200, 100},
.normalColor = {100, 100, 200, 255},
.hoverColor = {150, 150, 250, 255},
.pressedColor = {50, 50, 150, 255},
.isPressed = 0,
.isHovered = 0
};

// 主循环
SDL_Event event;
int running = 1;
while (running) {
// 处理事件
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
running = 0;
break;

case SDL_MOUSEMOTION:
// 检测鼠标悬停
myButton.isHovered = SDL_PointInRect(
&(SDL_Point){event.motion.x, event.motion.y},
&myButton.rect
);
break;

case SDL_MOUSEBUTTONDOWN:
if (event.button.button == SDL_BUTTON_LEFT &&
SDL_PointInRect(&(SDL_Point){event.button.x, event.button.y},
&myButton.rect)) {
myButton.isPressed = 1;
}
break;

case SDL_MOUSEBUTTONUP:
if (event.button.button == SDL_BUTTON_LEFT) {
if (myButton.isPressed &&
SDL_PointInRect(&(SDL_Point){event.button.x, event.button.y},
&myButton.rect)) {
SDL_Log("Button clicked!");
}
myButton.isPressed = 0;
}
break;
}
}

// 渲染
SDL_SetRenderDrawColor(renderer, 240, 240, 240, 255);
SDL_RenderClear(renderer);

renderButton(renderer, &myButton);

SDL_RenderPresent(renderer);
SDL_Delay(16);
}

// 清理资源
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
TTF_Quit();
SDL_Quit();
return 0;
}

gcc main.c -o helloworld `sdl2-config --cflags --libs` -lSDL2_ttf -lcapstone

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