Programming Forums > Application Development > C++

DeLoRtEd1 · Feb 9th, 2006, 6:13 PM

Hi!

Anyways, here's my problem. My class at school is making a "Robot wars game", where we make the engine, then we design our robots (which aren't real, they are just blips on the screen) in the way we want. My job though, is to create the grid for the screen. I really want it in a real window, and not just by using cout's. The only thing that is close to what I want is the typical hello world application, but I want that line of text deleted, and a bitmap that fills the screen (the 10x10 grid, or whatever would fit the screen dimensions) How would I do this? Or can someone do it for me with detailed comments? I'm still pretty shaky on hwnd's and hinstances... or whatever. If you did it for me, I would still be learning a lot.
Hopefully this isn't asking too much. Thanks!
-del

Mjordan2nd · Feb 9th, 2006, 6:21 PM

If you're going to be using the Windows API I would suggest reading a couple of tutorials. A very simple hello world program would be easy, just a dialog box popping up saying hello world. But if you want to make an actual window and stuff, just the skeleton is pretty complex the first time you look at it. There will be concepts that you might not be familiar with, and therefore writing a program like that, even with comments, probably won't do much good. Believe it or not, that simple of a program is probably 60 or 70+ lines of code.

AICkieran · Feb 9th, 2006, 7:15 PM

wxWidgets might be handy, wxBitmap to display the bitmap theres alot of other useful stuff (I havent actually used WxWidgets but ive read through the docs and such and its been reccomended to me, This is just my (uneducated) opinion)

http://www.wxwidgets.org/manuals/2.6....html#classref

Dameon · Feb 9th, 2006, 7:17 PM

All of the drawing would likely be wrapped up in the repaint handler. Using a back buffer would be a waste of memory in this case.

nnxion · Feb 10th, 2006, 4:51 AM

Search for some tutorials on GDI, which you can use in your WM_PAINT message.

Infinite Recursion · Feb 10th, 2006, 7:27 AM

Quote:

If you did it for me, I would still be learning a lot.

How do you figure that?

Try this tutorial: http://www.functionx.com/win32/index.htm

DaWei · Feb 10th, 2006, 7:33 AM

LmAo. iN aDdItIoN tO rEaDiNg TuToRiAlS, i WoUlD sUgGeSt ReAdInG tHe FoRuM fAq/RuLeS rEgArDiNg HoMeWoRk.

DeLoRtEd1 · Feb 10th, 2006, 3:49 PM

It's not homework, my teacher / classmates just keep telling me to make it in a DOS program (and I'd like to try and stray away from DOS) where I just draw an ascii grid with cout's, which I can do with my eyes closed. So basically, if someone actually did this (in response to post above) with comments explaining each line, I would still pick up some things about this kind of coding, which is what I'd like to learn outside of class.

nnxion · Feb 10th, 2006, 4:56 PM

If only people read...

(Toggle Plain Text)

/* Includes */
#include <windows.h>

/* Global variables */
const char *clsName = "BasicApp";
const char *wndName = "A Simple Window";

/* Prototypes */
LRESULT CALLBACK WndProcedure(HWND, UINT, WPARAM, LPARAM);

/* Starting point */
INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	MSG        msg;
	HWND       hwnd;
	WNDCLASSEX wcx;

	/* Create the application window */
	wcx.cbSize        = sizeof(WNDCLASSEX);
	wcx.style         = CS_HREDRAW | CS_VREDRAW;
	wcx.lpfnWndProc   = WndProcedure;
	wcx.cbClsExtra    = 0;
	wcx.cbWndExtra    = 0;
	wcx.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
	wcx.hCursor       = LoadCursor(NULL, IDC_ARROW);
	wcx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wcx.lpszMenuName  = NULL;
	wcx.lpszClassName = clsName;
	wcx.hInstance     = hInstance;
	wcx.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

	/* Register the application */
	if(!RegisterClassEx(&wcx))
	{
		MessageBox(NULL, "RegisterClassEx Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
		return 1;
  	}

	/* Create the window */
	hwnd = CreateWindow(clsName,
			  wndName,
			  WS_OVERLAPPEDWINDOW,
			  CW_USEDEFAULT,
			  CW_USEDEFAULT,
			  CW_USEDEFAULT,
			  CW_USEDEFAULT,
			  NULL,
			  NULL,
			  hInstance,
			  NULL);

	/* If creating failed */
	if(!hwnd)
	{
	      MessageBox(NULL, "CreateWindow Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
	      return 1;
  	}

	ShowWindow(hwnd, SW_SHOWNORMAL);
	UpdateWindow(hwnd);

	/* Message loop */
	while(GetMessage(&msg, NULL, 0, 0))
	{
             TranslateMessage(&msg);
             DispatchMessage(&msg);
	}

	return (int)msg.wParam;
}

/* Window Procedure */
LRESULT CALLBACK WndProcedure(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	int numxlines = 0, numylines = 0;
	PAINTSTRUCT ps;
	HDC hdc;

    switch(msg)
    {
		case WM_PAINT:
			hdc = BeginPaint(hwnd, &ps);

			for(int x = 20; numxlines < 20; x += 20, numxlines++)
			{
				MoveToEx(hdc, 60, x, NULL);
				LineTo(hdc, 460, x);
			}

			for(int y = 60; numylines <= 20; y += 20, numylines++)
			{
				MoveToEx(hdc, y, 20, NULL);
				LineTo(hdc, y, 400);
			}

			EndPaint(hwnd, &ps);
			break;

		case WM_DESTROY:
			PostQuitMessage(1);
			break;

		default:
			return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

/* Includes */
#include <windows.h>

/* Global variables */
const char *clsName = "BasicApp";
const char *wndName = "A Simple Window";

/* Prototypes */
LRESULT CALLBACK WndProcedure(HWND, UINT, WPARAM, LPARAM);

/* Starting point */
INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	MSG        msg;
	HWND       hwnd;
	WNDCLASSEX wcx;

	/* Create the application window */
	wcx.cbSize        = sizeof(WNDCLASSEX);
	wcx.style         = CS_HREDRAW | CS_VREDRAW;
	wcx.lpfnWndProc   = WndProcedure;
	wcx.cbClsExtra    = 0;
	wcx.cbWndExtra    = 0;
	wcx.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
	wcx.hCursor       = LoadCursor(NULL, IDC_ARROW);
	wcx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wcx.lpszMenuName  = NULL;
	wcx.lpszClassName = clsName;
	wcx.hInstance     = hInstance;
	wcx.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

	/* Register the application */
	if(!RegisterClassEx(&wcx))
	{
		MessageBox(NULL, "RegisterClassEx Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
		return 1;
  	}

	/* Create the window */
	hwnd = CreateWindow(clsName,
			  wndName,
			  WS_OVERLAPPEDWINDOW,
			  CW_USEDEFAULT,
			  CW_USEDEFAULT,
			  CW_USEDEFAULT,
			  CW_USEDEFAULT,
			  NULL,
			  NULL,
			  hInstance,
			  NULL);

	/* If creating failed */
	if(!hwnd)
	{
	      MessageBox(NULL, "CreateWindow Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
	      return 1;
  	}

	ShowWindow(hwnd, SW_SHOWNORMAL);
	UpdateWindow(hwnd);

	/* Message loop */
	while(GetMessage(&msg, NULL, 0, 0))
	{
             TranslateMessage(&msg);
             DispatchMessage(&msg);
	}

	return (int)msg.wParam;
}

/* Window Procedure */
LRESULT CALLBACK WndProcedure(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	int numxlines = 0, numylines = 0;
	PAINTSTRUCT ps;
	HDC hdc;

    switch(msg)
    {
		case WM_PAINT:
			hdc = BeginPaint(hwnd, &ps);

			for(int x = 20; numxlines < 20; x += 20, numxlines++)
			{
				MoveToEx(hdc, 60, x, NULL);
				LineTo(hdc, 460, x);
			}

			for(int y = 60; numylines <= 20; y += 20, numylines++)
			{
				MoveToEx(hdc, y, 20, NULL);
				LineTo(hdc, y, 400);
			}

			EndPaint(hwnd, &ps);
			break;

		case WM_DESTROY:
			PostQuitMessage(1);
			break;

		default:
			return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

Prm753 · Feb 10th, 2006, 5:18 PM

Quote:

Originally Posted by DaWei

LmAo. iN aDdItIoN tO rEaDiNg TuToRiAlS, i WoUlD sUgGeSt ReAdInG tHe FoRuM fAq/RuLeS rEgArDiNg HoMeWoRk.

Hahahahaha!!!

Feb 9th, 2006, 6:13 PM	#1
DeLoRtEd1 Newbie Join Date: Jan 2006 Posts: 8 Rep Power: 0	Hello World! Help Hi! Anyways, here's my problem. My class at school is making a "Robot wars game", where we make the engine, then we design our robots (which aren't real, they are just blips on the screen) in the way we want. My job though, is to create the grid for the screen. I really want it in a real window, and not just by using cout's. The only thing that is close to what I want is the typical hello world application, but I want that line of text deleted, and a bitmap that fills the screen (the 10x10 grid, or whatever would fit the screen dimensions) How would I do this? Or can someone do it for me with detailed comments? I'm still pretty shaky on hwnd's and hinstances... or whatever. If you did it for me, I would still be learning a lot. Hopefully this isn't asking too much. Thanks! -del

Feb 9th, 2006, 6:21 PM	#2
Mjordan2nd The Supreme Ruler Join Date: May 2004 Location: Houston Posts: 1,476 Rep Power: 6	If you're going to be using the Windows API I would suggest reading a couple of tutorials. A very simple hello world program would be easy, just a dialog box popping up saying hello world. But if you want to make an actual window and stuff, just the skeleton is pretty complex the first time you look at it. There will be concepts that you might not be familiar with, and therefore writing a program like that, even with comments, probably won't do much good. Believe it or not, that simple of a program is probably 60 or 70+ lines of code. __________________ "Every gun that is made, every warship launched, every rocket signifies, in the final sense, a theft from those who hunger and are not fed, from those who are cold and are not clothed. The world in arms is not spending money alone. It is spending the sweat of its laborers, the genius of its scientists, the hopes of its children." - Dwight D. Eisenhower

Feb 9th, 2006, 7:17 PM	#4
Dameon Troll Join Date: Apr 2005 Location: Texas Posts: 732 Rep Power: 4	All of the drawing would likely be wrapped up in the repaint handler. Using a back buffer would be a waste of memory in this case. __________________ MD5(sig) = bcef75433db02e9ad9bf81d6f7c5c270

Feb 10th, 2006, 4:51 AM	#5
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	Search for some tutorials on GDI, which you can use in your WM_PAINT message. __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

Feb 10th, 2006, 7:33 AM	#7
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	LmAo. iN aDdItIoN tO rEaDiNg TuToRiAlS, i WoUlD sUgGeSt ReAdInG tHe FoRuM fAq/RuLeS rEgArDiNg HoMeWoRk. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Feb 9th, 2006, 7:15 PM	#3
AICkieran Programmer Join Date: Jan 2006 Location: UK Posts: 55 Rep Power: 3	wxWidgets might be handy, wxBitmap to display the bitmap theres alot of other useful stuff (I havent actually used WxWidgets but ive read through the docs and such and its been reccomended to me, This is just my (uneducated) opinion) http://www.wxwidgets.org/manuals/2.6....html#classref

Feb 10th, 2006, 3:49 PM	#8
DeLoRtEd1 Newbie Join Date: Jan 2006 Posts: 8 Rep Power: 0	It's not homework, my teacher / classmates just keep telling me to make it in a DOS program (and I'd like to try and stray away from DOS) where I just draw an ascii grid with cout's, which I can do with my eyes closed. So basically, if someone actually did this (in response to post above) with comments explaining each line, I would still pick up some things about this kind of coding, which is what I'd like to learn outside of class.

Feb 10th, 2006, 4:56 PM	#9
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	If only people read... (Toggle Plain Text) /* Includes / #include <windows.h> / Global variables / const char clsName = "BasicApp"; const char wndName = "A Simple Window"; / Prototypes / LRESULT CALLBACK WndProcedure(HWND, UINT, WPARAM, LPARAM); / Starting point / INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { MSG msg; HWND hwnd; WNDCLASSEX wcx; / Create the application window / wcx.cbSize = sizeof(WNDCLASSEX); wcx.style = CS_HREDRAW \| CS_VREDRAW; wcx.lpfnWndProc = WndProcedure; wcx.cbClsExtra = 0; wcx.cbWndExtra = 0; wcx.hIcon = LoadIcon(NULL, IDI_APPLICATION); wcx.hCursor = LoadCursor(NULL, IDC_ARROW); wcx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wcx.lpszMenuName = NULL; wcx.lpszClassName = clsName; wcx.hInstance = hInstance; wcx.hIconSm = LoadIcon(NULL, IDI_APPLICATION); / Register the application / if(!RegisterClassEx(&wcx)) { MessageBox(NULL, "RegisterClassEx Failed!", "Error!", MB_ICONEXCLAMATION \| MB_OK); return 1; } / Create the window / hwnd = CreateWindow(clsName, wndName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); / If creating failed / if(!hwnd) { MessageBox(NULL, "CreateWindow Failed!", "Error!", MB_ICONEXCLAMATION \| MB_OK); return 1; } ShowWindow(hwnd, SW_SHOWNORMAL); UpdateWindow(hwnd); / Message loop / while(GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return (int)msg.wParam; } / Window Procedure / LRESULT CALLBACK WndProcedure(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) { int numxlines = 0, numylines = 0; PAINTSTRUCT ps; HDC hdc; switch(msg) { case WM_PAINT: hdc = BeginPaint(hwnd, &ps); for(int x = 20; numxlines < 20; x += 20, numxlines++) { MoveToEx(hdc, 60, x, NULL); LineTo(hdc, 460, x); } for(int y = 60; numylines <= 20; y += 20, numylines++) { MoveToEx(hdc, y, 20, NULL); LineTo(hdc, y, 400); } EndPaint(hwnd, &ps); break; case WM_DESTROY: PostQuitMessage(1); break; default: return DefWindowProc(hwnd, msg, wParam, lParam); } return 0; } / Includes / #include <windows.h> / Global variables / const char clsName = "BasicApp"; const char wndName = "A Simple Window"; / Prototypes / LRESULT CALLBACK WndProcedure(HWND, UINT, WPARAM, LPARAM); / Starting point / INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { MSG msg; HWND hwnd; WNDCLASSEX wcx; / Create the application window / wcx.cbSize = sizeof(WNDCLASSEX); wcx.style = CS_HREDRAW \| CS_VREDRAW; wcx.lpfnWndProc = WndProcedure; wcx.cbClsExtra = 0; wcx.cbWndExtra = 0; wcx.hIcon = LoadIcon(NULL, IDI_APPLICATION); wcx.hCursor = LoadCursor(NULL, IDC_ARROW); wcx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wcx.lpszMenuName = NULL; wcx.lpszClassName = clsName; wcx.hInstance = hInstance; wcx.hIconSm = LoadIcon(NULL, IDI_APPLICATION); / Register the application / if(!RegisterClassEx(&wcx)) { MessageBox(NULL, "RegisterClassEx Failed!", "Error!", MB_ICONEXCLAMATION \| MB_OK); return 1; } / Create the window / hwnd = CreateWindow(clsName, wndName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); / If creating failed / if(!hwnd) { MessageBox(NULL, "CreateWindow Failed!", "Error!", MB_ICONEXCLAMATION \| MB_OK); return 1; } ShowWindow(hwnd, SW_SHOWNORMAL); UpdateWindow(hwnd); / Message loop / while(GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return (int)msg.wParam; } / Window Procedure */ LRESULT CALLBACK WndProcedure(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) { int numxlines = 0, numylines = 0; PAINTSTRUCT ps; HDC hdc; switch(msg) { case WM_PAINT: hdc = BeginPaint(hwnd, &ps); for(int x = 20; numxlines < 20; x += 20, numxlines++) { MoveToEx(hdc, 60, x, NULL); LineTo(hdc, 460, x); } for(int y = 60; numylines <= 20; y += 20, numylines++) { MoveToEx(hdc, y, 20, NULL); LineTo(hdc, y, 400); } EndPaint(hwnd, &ps); break; case WM_DESTROY: PostQuitMessage(1); break; default: return DefWindowProc(hwnd, msg, wParam, lParam); } return 0; } __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

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Programming Forums > Application Development > C++

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