GDI programming in C++

Africa

Hi there i have to make a breakout game for college but i cannot get how to make the region to rebound against object or how the make the paddle stop leaving the screen (it breaking into the region). Also, i need to know how i would make the paddle follow the mouse, as in the sprite is already selected to the mouse but that it will also follow it....im getting confused by this little thing...

Evil Phil

Have a read of this first: http://www.boards.ie/vbulletin/showthread.php?t=2055012835

Africa

Ok, here is the code. Its for a GDI project we have to do, so i have just posted up some parts. Yes it is still very basic with basically drawing some bmps', making rectangles and the ellipse for the ball. The paddle moves but i dont know how to make is stop when it gets to 0 on the X axis.:

HINSTANCE hInstMain=NULL;//main application handle
HWND hWndMain=NULL;//handle to our main window
HBITMAP hBtmpBar; // hBtmp is a handle to a bitmap
HBITMAP hBtmpBarMask; // hBtmp is a handle to a bitmap

HBITMAP hBtmpBackground; // hBtmp is a handle to a bitmap



SIZE szBackground,szBar;
POINT ptBackground,ptBar;

enum current_sprite {none, Bar, Ball};

current_sprite sprite_selected;
//OBJECT paddle,ball,brick;



//////////////////////////////////////////////////////////////////////////////
//WINDOWPROC
//////////////////////////////////////////////////////////////////////////////
LRESULT CALLBACK TheWindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
//which message did we get?
switch(uMsg)
{
case WM_DESTROY://the window is being destroyed
{

//tell the application we are quitting
PostQuitMessage(0);

//handled message, so return 0
return(0);

}break;
case WM_PAINT://the window needs repainting
{
//a variable needed for painting information
PAINTSTRUCT ps;
//start painting
HDC hdc=BeginPaint(hwnd,&ps);

/////////////////////////////
//painting code would go here
/////////////////////////////
SelectObject(hdc,GetStockObject(NULL_BRUSH));
HPEN pen=CreatePen(PS_SOLID,1,RGB(250,250,0));

SelectObject(hdc,pen);
ShowBitmap(hdc,hBtmpBackground,0,0); //display the bitmap
pen=CreatePen(PS_SOLID,7,RGB(255,255,0));

// Ball=Ellipse(hdc,(((ptBar.x+szBar.cx)-ptBar.x)/2)+ptBar.x-5,(((ptBar.y-szBar.cy)-ptBar.y)/2)+ptBar.y-10,(((ptBar.x+szBar.cx)-ptBar.x)/2)+ptBar.x+5,(((ptBar.y)-ptBar.y)/2)+ptBar.y-5);


pen=CreatePen(PS_SOLID,5,RGB(255,0,0));

ShowBitmap(hdc,hBtmpBarMask,ptBar.x, ptBar.y, SRCAND); //display the bitmap
ShowBitmap(hdc,hBtmpBar,ptBar.x, ptBar.y,SRCPAINT); //display the bitmap
Rectangle(hdc,ptBar.x,ptBar.y,ptBar.x+szBar.cx,ptBar.y+szBar.cy);

if(sprite_selected==Ball){
Rectangle(hdc,ptBar.x, ptBar.y,ptBar.x+szBar.cx,ptBar.y+szBar.cy);
}
if(ptBar.x==50)
sprite_selected=none;

double rectangle[8];
static int a,b,c,d;
a=50;
b=50;
c=100;
d=60;
for(int i=0;i<8;i++)
{
Rectangle(hdc,a,b,c,d);
a+50;
c+50;
}

//end painting
EndPaint(hwnd,&ps);
return(0);
}break;


case WM_CHAR:
{
switch(wParam){
case VK_SPACE:
{
sprite_selected=Ball;
}break;
case VK_ESCAPE:
{
sprite_selected=none;
}break;

}
InvalidateRect(hWndMain,NULL,false);
}break;


case WM_KEYDOWN:
{
POINT* pt;

if (sprite_selected==none){
break;
}
switch (sprite_selected){
case Bar:
{
pt=&ptBar;
}break;

}
switch(wParam){
case VK_LEFT:
{
// if(paddle
for(int i=0;i<30;i++)
pt->x--;

}break;
case VK_RIGHT:
{
for(int i=0;i<30;i++)
pt->x++;
}break;

}


InvalidateRect(hWndMain,NULL,false);
}break;
}

//pass along any other message to default message handler
return(DefWindowProc(hwnd,uMsg,wParam,lParam));
}


SKIP TO INITIALISATION


//////////////////////////////////////////////////////////////////////////////
//INITIALIZATION
//////////////////////////////////////////////////////////////////////////////
bool Prog_Init()
{
////////////////////////////////////
//your initialization code goes here
////////////////////////////////////
BITMAP bm;
//background
hBtmpBackground=(HBITMAP)LoadImage(
NULL, // dont worry, leave as null
"background.bmp", // name of the file to be loaded
IMAGE_BITMAP, // load a bitmap as opposed to a cursor or icon
0, // leave as 0
0, // leave as 0
LR_LOADFROMFILE); // load from file as opposed to a resource


//Ball.x=0,Ball.y=0;

//bar


hBtmpBar=(HBITMAP)LoadImage(
NULL, // dont worry, leave as null
"Bar.bmp", // name of the file to be loaded
IMAGE_BITMAP, // load a bitmap as opposed to a cursor or icon
0, // leave as 0
0, // leave as 0
LR_LOADFROMFILE); // load from file as opposed to a resource


//bar mask
hBtmpBarMask = CreateBitmapMask(hBtmpBar,RGB(0,255,0));

ptBar.x=380;
ptBar.y=550;

GetObject(hBtmpBar,sizeof(bm), &bm);
szBar.cx=bm.bmWidth;
szBar.cy=bm.bmHeight;

/*
//brick1

hBtmpLisa=(HBITMAP)LoadImage(
NULL, // dont worry, leave as null
"lisa.bmp", // name of the file to be loaded
IMAGE_BITMAP, // load a bitmap as opposed to a cursor or icon
0, // leave as 0
0, // leave as 0
LR_LOADFROMFILE); // load from file as opposed to a resource
//brick1 mask


// SelectObject(hdc,GetStockObject(NULL_BRUSH));

hBtmpLisaMask = CreateBitmapMask(hBtmpLisa,RGB(0,0,0));

ptLisa.x=500;
ptLisa.y=200;

GetObject(hBtmpLisa,sizeof(bm), &bm);
szLisa.cx=bm.bmWidth;
szLisa.cy=bm.bmHeight;


//brick2


hBtmpMag=(HBITMAP)LoadImage(
NULL, // dont worry, leave as null
"mag.bmp", // name of the file to be loaded
IMAGE_BITMAP, // load a bitmap as opposed to a cursor or icon
0, // leave as 0
0, // leave as 0
LR_LOADFROMFILE); // load from file as opposed to a resource
//brickmask2


// SelectObject(hdc,GetStockObject(NULL_BRUSH));
hBtmpMagMask = CreateBitmapMask(hBtmpMag,RGB(0,0,0));

ptMag.x=100;
ptMag.y=200;

GetObject(hBtmpMag,sizeof(bm), &bm);
szMag.cx=bm.bmWidth;
szMag.cy=bm.bmHeight;

sprite_selected=none;





*/



return(true);//return success
}