SDL实现多个按钮

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  废话不多说，先上效果图：

  

  代码：

 

#include <SDL2/SDL.h>#include <SDL2/SDL_ttf.h>SDL_Window*window=NULL;SDL_Renderer*renderer=NULL;//窗口类class Window{    public:    //记录是否加载成功    bool load;    //构造函数    Window(char title[20], Uint32 w=720, Uint32 h=1280, int flag=0)   {        load=false;        if (!SDL_Init(SDL_INIT_VIDEO))        if (window=SDL_CreateWindow(title, 0, 0, w, h, flag))        if (renderer=SDL_CreateRenderer(window, -1, 0))        {            //加载窗口成功            load=true;        }    }        //析构函数    ~Window()    {SDL_DestroyRenderer(renderer);SDL_DestroyWindow(window);SDL_Quit();    }    //填充窗口：白色    void fullWindow()    {SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);SDL_RenderFillRect(renderer, NULL);    }    //刷新窗口    void reflush()    {SDL_RenderPresent(renderer);SDL_RenderClear(renderer);    }};//文字类class Font{    public:    TTF_Font*font;     //构造函数    Font(int size=100)    {        TTF_Init();font=TTF_OpenFont("/system/fonts/DroidSansFallback.ttf", size);    }    //析构函数    ~Font()    {        TTF_CloseFont(font);        font=0;        TTF_Quit();    }    //把文字加载成textureSDL_Texture*loadTex(char*str, int type=4)    {        switch (type)        {            case 0:TTF_SetFontStyle(font,TTF_STYLE_BOLD);break; //粗体            case 1:TTF_SetFontStyle(font,TTF_STYLE_ITALIC);break; //斜体            case 2:TTF_SetFontStyle(font,TTF_STYLE_UNDERLINE);break; //下划线            case 3:TTF_SetFontStyle(font,TTF_STYLE_STRIKETHROUGH);break; //删除线            case 4:TTF_SetFontStyle(font,TTF_STYLE_NORMAL);break; //正常        }        //文字颜色：黑色        SDL_Color color={0, 0, 0, 255};        SDL_Surface*surface=TTF_RenderUTF8_Blended(font, str, color);SDL_Texture*texture=SDL_CreateTextureFromSurface(renderer, surface);SDL_FreeSurface(surface);        return texture;    }};//纹理类class Tex{    public:    SDL_Texture*tex[6];    SDL_Rect box[6];    Font font;    //构造函数    Tex()    {        char*str[6]={"按钮0", "按钮1", "按钮2", "按钮3", "按钮4", "退出"};         for (int i=0; i<6; i++)        {tex[i]=font.loadTex(str[i], 4);        int w,h;//获取纹理大小        SDL_QueryTexture(tex[i], NULL, NULL, &w, &h);//设置纹理的显示坐标        box[i].x=250;        box[i].y=i*150+100;        box[i].w=w;        box[i].h=h;        }       }    //析构函数    ~Tex()    {        for (int i=0; i<6; i++)        {            if (tex[i]!=NULL)            SDL_DestroyTexture(tex[i]);        }    }    //显示tex    void showTex(int n)    {SDL_RenderCopy(renderer, tex[n], NULL, &box[n]);    }};//按钮类class Button{    SDL_Event event;    SDL_Rect box[6];    Tex tex;    //屏幕分辨率    int win_w,win_h;public :int m=-1; //按下和移动时按钮索引int n=-1;  //抬起时按钮索引//构造函数Button(){//获取屏幕分辨率SDL_GetWindowSize(window, &win_w, &win_h);//获取tex文字大小和坐标for (int i=0; i<6; i++){box[i].x=tex.box[i].x;box[i].y=tex.box[i].y;box[i].w=tex.box[i].w;box[i].h=tex.box[i].h;}}void touch(){while (SDL_PollEvent(&event)){switch (event.type){//手指按下case SDL_FINGERDOWN://手指滑动case SDL_FINGERMOTION:{//event.tfinger.x和event.tfinger.y值范围：0~1SDL_Point point={event.tfinger.x*win_w, event.tfinger.y*win_h};for (int i=0; i<6; i++)//判断触点是否在box矩形中中if (SDL_PointInRect(&point, &box[i]))m=i;}break;//手指抬起case SDL_FINGERUP:{//event.tfinger.x和event.tfinger.y值范围：0~1SDL_Point point={event.tfinger.x*win_w, event.tfinger.y*win_h};for (int i=0; i<6; i++)//判断触点是否在box矩形中if (SDL_PointInRect(&point, &box[i]))n=i;m=-1;}break;}}}void show(){//绘画填充矩形for (int i=0; i<6; i++){SDL_SetRenderDrawColor(renderer, 0, 255, 255, 0);SDL_RenderFillRect(renderer, &box[i]);}if (m!=-1){SDL_SetRenderDrawColor(renderer, 255, 0, 0, 0);SDL_RenderFillRect(renderer, &box[m]);}//显示文字for (int i=0; i<6; i++)tex.showTex(i);}};//主函数int main(int argc, char**argv){    Window win("多个按钮");    Button button;    while (win.load)    {    button.touch();    button.show();    if (button.n==5)    win.load=false;        win.reflush();        win.fullWindow();    }    }