Qt5.5 SDL2.0 鼠标事件，键盘事件，BMP图片加载

１Q5.5 ＋SDL环境搭建

1.1pro 文件配置

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp


include(deployment.pri)
qtcAddDeployment()

# -L后面不能有空格 #LIBS += -L./lib/x86 -lSDL2
#LIBS += -L./lib/x86 -lSDL2main
#LIBS += -L./lib/x86 -lSDL2test

LIBS += -L$$_PRO_FILE_PWD_/lib/x86 -lSDL2
                    -lSDL2main
                    -lSDL2test

1.1用到的图片

2 代码示例

实现的功能

1. 按上下左右键，可以实现图片的上下左右移动
2. 点击鼠标左键，图片出现的鼠标所点击的位置
3. 点击鼠标右键，换图片。

#include <iostream>
#include "include/SDL.h"
#undef main
using namespace std;

int main()
{
bool bQuit = false;

    SDL_Init(SDL_INIT_VIDEO);

    SDL_Window * window = SDL_CreateWindow("first",SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,600,400,SDL_WINDOW_RESIZABLE);
    SDL_Renderer * render = SDL_CreateRenderer(window,-1,SDL_RENDERER_SOFTWARE);

    SDL_Surface *bmp = SDL_LoadBMP("../abc.bmp");
if(bmp == NULL)
cout<<"surface error"<<endl;

    SDL_Surface *bmp2 = SDL_LoadBMP("../aa.bmp");
if(bmp == NULL)
cout<<"surface error"<<endl;

    SDL_Texture * texture  = SDL_CreateTextureFromSurface(render,bmp);
if(texture == NULL)
cout<<"texture error"<<endl;

static bool flag = true;



    SDL_Rect srcRet;


    SDL_Rect dstRect;

    dstRect.x = 30;
    dstRect.y = 40;
    dstRect.w = 200;
    dstRect.h = 200;


    SDL_Event ev;
while(!bQuit)
    {

while(SDL_PollEvent(&ev))
        {
switch(ev.type)
            {
case SDL_KEYDOWN:
switch(ev.key.keysym.sym)
                    {
case SDLK_DOWN:
cout<<"down"<<endl;
                            dstRect.y -= 10;
break;
case SDLK_UP:
cout<<"up"<<endl;
                            dstRect.y += 10;
break;

case SDLK_LEFT:
cout<<"left"<<endl;
                            dstRect.x -= 10;
break;

case SDLK_RIGHT:
cout<<"right"<<endl;
                            dstRect.x += 10;
break;

                    }
break;

case SDL_MOUSEBUTTONDOWN:
cout<<"mouse"<<endl;
switch(ev.button.button)
                    {
case SDL_BUTTON_LEFT:
                            dstRect.x = ev.button.x;
                            dstRect.y = ev.button.y;
break;

case SDL_BUTTON_RIGHT:
if(flag)
                                texture  = SDL_CreateTextureFromSurface(render,bmp2);
else
                                texture  = SDL_CreateTextureFromSurface(render,bmp);
                            flag = !flag;
break;

                    }

break;

case SDL_QUIT:
                    bQuit == true;
return 0;

            }
        }
        SDL_RenderClear(render);
        SDL_RenderCopy(render,texture,NULL,&dstRect);
        SDL_RenderPresent(render);


    }

    SDL_Quit();
return 0;
}