Trying to get a bmp. to move with in boundries in a windows ap....
I have gotten all the way up to the point were the bitmap is drawn on the windows ap. Now I basically am trying to get the bitmap to float around never leaving the bounds of the the ap. So if it hits a side of the ap (width or height) then it is just going to bounce off and go another way. Kind of like that one game were there was a paddle at the bottom of the screen and you had to bounce a ball towards the top were you broke down bricks. Anyways, take a look at the last function...
Code:
#include <windows.h>
#include <winuser.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define APPTITLE "Game Loop"
//function prototypes
LRESULT CALLBACK WinProc(HWND,UINT,WPARAM,LPARAM);
ATOM MyRegisterClass(HINSTANCE);
BOOL InitInstance(HINSTANCE,int);
void DrawBitmap(HDC,char*,int,int);
void Game_Init();
void Game_Run();
void Game_End();
//local variables
HWND global_hwnd;
HDC global_hdc;
//the window event callback function
LRESULT CALLBACK WinProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
global_hwnd = hWnd;
global_hdc = GetDC(hWnd);
switch (message)
{
case WM_DESTROY:
Game_End();
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}
//helper function to set up the window properties
ATOM MyRegisterClass(HINSTANCE hInstance)
{
//create the window class structure
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
//fill the struct with info
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = APPTITLE;
wc.hIconSm = NULL;
//set up the window with the class info
return RegisterClassEx(&wc);
}
//helper function to create the window and refresh it
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
//create a new window
hWnd = CreateWindow(
APPTITLE, //window class
APPTITLE, //title bar
WS_OVERLAPPEDWINDOW, //window style
CW_USEDEFAULT, //x position of window
CW_USEDEFAULT, //y position of window
500, //width of the window
400, //height of the window
NULL, //parent window
NULL, //menu
hInstance, //application instance
NULL); //window parameters
//was there an error creating the window?
if (!hWnd)
return FALSE;
//display the window
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//entry point for a Windows program
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
int done = 0;
MSG msg;
// register the class
MyRegisterClass(hInstance);
// initialize application
if (!InitInstance (hInstance, nCmdShow))
return FALSE;
//initialize the game
Game_Init();
// main message loop
while (!done)
{
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
//look for quit message
if (msg.message == WM_QUIT)
done = 1;
//decode and pass messages on to WndProc
TranslateMessage(&msg);
DispatchMessage(&msg);
}
//process game loop
Game_Run();
}
return msg.wParam;
}
void DrawBitmap(HDC hdcDest, char *filename, int x, int y)
{
HBITMAP image;
BITMAP bm;
HDC hdcMem;
//load the bitmap image
image = LoadImage(0,"w.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
//read the bitmap's properties
GetObject(image, sizeof(BITMAP), &bm);
//create a device context for the bitmap
hdcMem = CreateCompatibleDC(global_hdc);
SelectObject(hdcMem, image);
//draw the bitmap to the window (bit block transfer)
BitBlt(
global_hdc, //destination device context
x, y, //x,y location on destination
bm.bmWidth, bm.bmHeight, //width,height of source bitmap
hdcMem, //source bitmap device context
0, 0, //start x,y on source bitmap
SRCCOPY); //blit method
//delete the device context and bitmap
DeleteDC(hdcMem);
DeleteObject((HBITMAP)image);
}
void Game_Init()
{
//initialize the game...
//load bitmaps, meshes, textures, sounds, etc.
srand(time(NULL));
}
void Game_Run()
{
//this is called once every frame
char buffer[80];
static iCount = 0;
int x = 0, y = 0;
RECT rect;
GetClientRect(global_hwnd, &rect);
// if (rect.right > 0)
// {
// x = rand() % (rect.right - rect.left);
// y = rand() % (rect.bottom - rect.top);
DrawBitmap(global_hdc, "c.bmp", x, y);
// }
iCount++;
sprintf(buffer,"%d",iCount);
TextOut(global_hdc,0,10, buffer,strlen(buffer));
}
If you take a look you will notice I am trying to get this accomplished in the Game_Run(). As of now the bitmap is drawn in the top left corner of the form (0,0) The stuff that is commented out is some things I was working on but failing at.
How do you create an object of the actual instance of the bitmap I a trying to get to move?
Thanks
Chad
