Graphics Laboratory Korea University Windows Programming Graphics Laboratory Korea University

Microsoft Visual C++ 6.0

File  New

New Project

Win32 Application (1/2)

Win32 Application (2/2)

Workspace

New File

Workspace  FileView

“main.cpp”

#include <windows.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // global variables char *szClassName = "Draw2DClass"; int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int) { // Registers the window class WNDCLASSEX wcex; wcex.cbSize = sizeof(wcex); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = (WNDPROC)WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(NULL,IDI_APPLICATION); wcex.hIconSm = NULL; wcex.hCursor = LoadCursor(NULL,IDC_ARROW); wcex.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); wcex.lpszMenuName = NULL; wcex.lpszClassName = szClassName; RegisterClassEx(&wcex); // Create the main window HWND hWnd = CreateWindow(szClassName, "Draw in 2D", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL); if (!hWnd) return FALSE; ShowWindow(hWnd, SW_SHOWDEFAULT); UpdateWindow(hWnd); // Main message loop MSG msg; while (GetMessage(&msg, NULL, 0, 0)) TranslateMessage(&msg); DispatchMessage(&msg); } UnregisterClass(szClassName, wcex.hInstance); return msg.wParam;

Window Message Handling /* * WndProc: to process messages for the main window */ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; PAINTSTRUCT ps; switch (message) case WM_PAINT: hdc = BeginPaint(hWnd, &ps); // TODO: Add any drawing code here... EndPaint(hWnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0;

Build

Execute

Draw Points /* * WndProc: to process messages for the main window */ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; PAINTSTRUCT ps; register int i, j; switch (message) case WM_PAINT: hdc = BeginPaint(hWnd, &ps); // TODO: Add any drawing code here... for(i=-5; i<=5; i++) for(j=-5; j<=5; j++) SetPixel(hdc, 400+i, 300+j, RGB(255, 0, 0)); EndPaint(hWnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0;

Result – Draw Points

Mouse Event Handing (1/2) LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; PAINTSTRUCT ps; register int i, j; switch (message) case WM_PAINT: hdc = BeginPaint(hWnd, &ps); // TODO: Add any drawing code here... for(i=-5; i<=5; i++) for(j=-5; j<=5; j++) SetPixel(hdc, 400+i, 300+j, RGB(255, 0, 0)); EndPaint(hWnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); case WM_LBUTTONDOWN: case WM_LBUTTONUP: case WM_MOUSEMOVE: default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0;

Mouse Event Handing (1/2) int point[2] = { -5, -5 }; LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; PAINTSTRUCT ps; register int i, j; switch (message) case WM_PAINT: hdc = BeginPaint(hWnd, &ps); // TODO: Add any drawing code here... for(i=-5; i<=5; i++) for(j=-5; j<=5; j++) SetPixel(hdc, point[0]+i, point[1]+j, RGB(255, 0, 0)); EndPaint(hWnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); case WM_LBUTTONDOWN: point[0] = LOWORD(lParam); point[1] = HIWORD(lParam); InvalidateRect(hWnd, NULL, FALSE); default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0;

Result – Mouse Event Handling

Insert  Resource

Resources

Menu (1/6)

Menu (2/6)

Menu (3/6)

Menu (4/6)

Menu (5/6)

Menu (6/6)

Save Resources

Include Resources (1/3)

Include Resources (2/3)

Include Resources (3/3)

Result – Menu

Menu Event Handling

Result – Menu Event Handling

Miscellanies Check / Uncheck a item of menu CheckMenuItem(GetMenu(hWnd), ID_PRIM_LINE, MF_CHECKED); CheckMenuItem(GetMenu(hWnd), ID_PRIM_LINE, MF_UNCHECKED); Enable / Disable a item of menu EnableMenuItem(GetMenu(hWnd), ID_PRIM_LINE, MF_ENABLED); EnableMenuItem(GetMenu(hWnd), ID_PRIM_LINE, MF_GRAYED); COLORREF GetPixel( int x, int y ) const; COLORREF SetPixel( int x, int y, COLORREF crColor );

RGB Color Model R G B Color Colors are additive 0.0 0.0 0.0 Black 1.0 Red 0.0 1.0 0.0 Green 0.0 0.0 1.0 Blue 1.0 1.0 0.0 Yellow 1.0 0.0 1.0 Magenta 0.0 1.0 1.0 Cyan 1.0 1.0 1.0 White

Insert  Resource

Dialog Box (1/5)

Dialog Box (2/5)

Dialog Box (3/5)

Dialog Box (4/5)

Dialog Box (5/5)

New Menu

Dialog Callback Function (1/2)

Dialog Callback Function (2/2)

Dialog Creation

Result – Dialog Box

Debug