c4droid exemple sdl opengl mouse and key event

 /*colision line and triangle and game*/
#include "SDL.h"
#include <SDL.h>

#include <EGL/egl.h>


#include <GLES/gl.h>

#include <SDL2/SDL.h>

    SDL_Window *win = NULL;

    SDL_Renderer *renderer = NULL;

    SDL_Texture *bitmapTex = NULL;

        SDL_Surface *surface;
SDL_Surface * kursor = NULL;
SDL_Surface * przycisk = NULL;
SDL_Rect przyciskDane;
SDL_Rect przyciskCel;
        SDL_Rect rect, darea;
SDL_Rect kursorDane;
    SDL_Surface *bitmapSurface = NULL;
    SDL_Event event;

   
/*                     -----------
                               |
                               |
*/
void drawtriangle (SDL_Renderer *renderer)
{
     int a;
   
      przyciskDane.w = 200;
    przyciskDane.h = 50;
    przyciskCel.x = 300;
    przyciskCel.y = 240;
                SDL_SetRenderDrawColor(renderer, 255, 255, 0, SDL_ALPHA_OPAQUE);
                SDL_RenderDrawLine(renderer, 600, 200, 300, 240);
                SDL_RenderDrawLine(renderer, 300, 240, 340, 240);
                SDL_RenderDrawLine(renderer, 340, 240, 320, 200);
      
   
    }
         int a=0,b=0,c=320,d=240;
    int s=0;
void line (SDL_Renderer *renderer)
{

   //  kursorDane.y ;
                SDL_SetRenderDrawColor(renderer, 255, 0, 0, SDL_ALPHA_OPAQUE);
                SDL_RenderDrawLine(renderer,    kursorDane.x,    kursorDane.y ,    kursorDane.x +100,    kursorDane.y +100);
              
    
   
    }



void

DrawChessBoard(SDL_Renderer * renderer)

{
    drawtriangle (renderer);

    int row = 0,column = 0,x = 0;

    SDL_Rect rect, darea;


    /* Get the Size of drawing surface */

    SDL_RenderGetViewport(renderer, &darea);


    for ( ; row < 8; row++) {

        column = row%2;

        x = column;

        for ( ; column < 4+(row%2); column++) {

            SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);


            rect.w = darea.w/8;

            rect.h = darea.h/8;

            rect.x = x * rect.w;

            rect.y = row * rect.h;

            x = x + 2;

            SDL_RenderFillRect(renderer, &rect);

        }

    }

}

 void handle_events()
{
    //If a key was pressed
    if( event.type == SDL_KEYDOWN )
    {
        //Set the velocity
        switch( event.key.keysym.sym )
        {
            case SDLK_RIGHT: a+=10; break;
            case SDLK_LEFT: a-=10; break;
        }
    }
    //If a key was released
    else if( event.type == SDL_KEYUP )
    {
        //Set the velocity
        switch( event.key.keysym.sym )
        {
            case SDLK_RIGHT: a+=10; break;
            case SDLK_LEFT: a-=10; break;
        }
    }
}

int main(int argc, char *argv[]) {

      SDL_Init( SDL_INIT_EVERYTHING );
    int posX = 100, posY = 100, width = 320, height = 240;

           SDL_RenderFillRect(renderer, &rect);

  //  SDL_Init(SDL_INIT_VIDEO);


    win = SDL_CreateWindow("Hello World", posX, posY, width, height, SDL_WINDOW_OPENGL);

    surface = SDL_GetWindowSurface(win);

    renderer = SDL_CreateSoftwareRenderer(surface);

 

    SDL_RenderGetViewport(renderer, &darea);

             SDL_SetRenderDrawColor(renderer, 1, 0, 0, 0xFF);

 bitmapSurface = SDL_LoadBMP("hello.bmp");

    bitmapTex = SDL_CreateTextureFromSurface(renderer, bitmapSurface);

    SDL_FreeSurface(bitmapSurface);
   // SDL_WM_SetCaption( "Zdarzenia", NULL );
  //  SDL_Flip( ekran );

    while (1) {
   SDL_ShowCursor( SDL_DISABLE );
        SDL_Event e;
            if( e.type == SDL_KEYDOWN )
    {
        //Set the velocity
        switch( e.key.keysym.sym )
        {
            case SDLK_RIGHT: a+=10; break;
            case SDLK_LEFT: a-=10; break;
        }
    }
   
        if( e.type == SDL_MOUSEMOTION )
            {
                kursorDane.x = e.motion.x;
                kursorDane.y = e.motion.y;
            }
    //If a key was released
    else if( e.type == SDL_KEYUP )
    {
        //Set the velocity
        switch( e.key.keysym.sym )
        {
            case SDLK_RIGHT: a+=10; break;
            case SDLK_LEFT: a-=10; break;
        }
    }
    if( e.type == SDL_MOUSEBUTTONDOWN )
            {
                if( e.button.button == SDL_BUTTON_LEFT &&
                ( kursorDane.x >= przyciskCel.x && kursorDane.x <=
                przyciskCel.x + przyciskDane.w ) &&( kursorDane.y >=
                przyciskCel.y && kursorDane.y <= przyciskCel.y +
                przyciskDane.h ) )
                {
                    e.type==SDL_QUIT;
                   break;
                }
            }

        if (SDL_PollEvent(&e)) {

            if (e.type == SDL_QUIT) {

                break;

            }
           
   

        }

         //   DrawChessBoard(renderer);
    drawtriangle (renderer);
   
line(renderer);
    /* Got everything on rendering surface,

       now Update the drawing image on window screen */

    SDL_UpdateWindowSurface(win);

           SDL_RenderFillRect(renderer, &rect);       

        SDL_RenderClear(renderer);

        SDL_RenderCopy(renderer, bitmapTex, NULL, NULL);

 //       SDL_RenderPresent(renderer);

                glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
// turn on animate

   //     glClear(GL_COLOR_BUFFER_BIT);







    SDL_GL_SwapWindow(win);

    }


    SDL_DestroyTexture(bitmapTex);

    SDL_DestroyRenderer(renderer);

    SDL_DestroyWindow(win);


    SDL_Quit();


    return 0;

}