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| #include <windows.h>
#include <cmath>
#include <gl/gl.h>
void ChangeSize (GLsizei w, GLsizei h) {
GLfloat nRange = 300.0f;
if (h ==1)
h = 1;
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if(w <= h)
glOrtho(-nRange, nRange, -nRange * h/w, nRange * h / w, -nRange, nRange);
else
glOrtho(-nRange * w/h, nRange * w/h, -nRange , nRange , -nRange, nRange);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
HINSTANCE hInstance;
HWND hInstCommandTool;
char szCommandToolClassName[ ] = "CommandToolClass";
LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK CommandToolProcedure (HWND, UINT, WPARAM, LPARAM);
void RegisterCommandToolWindow()
{
WNDCLASSEX CommandToolClass = {0};
CommandToolClass.hInstance = hInstance;
CommandToolClass.hbrBackground = (HBRUSH) COLOR_BACKGROUND /*(COLOR_WINDOW + 1)*/;
CommandToolClass.lpszClassName = szCommandToolClassName;
CommandToolClass.lpfnWndProc = CommandToolProcedure;
CommandToolClass.hCursor = LoadCursor (NULL, IDC_ARROW);
CommandToolClass.cbSize = sizeof (WNDCLASSEX);
RegisterClassEx (&CommandToolClass);
}
static int cx = 800;
static int cy = 600;
static int ctx;
static int cty;
void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);
void DisableOpenGL(HWND, HDC, HGLRC);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
WNDCLASSEX wcex;
HWND hwnd;
HDC hDC;
HGLRC hRC;
MSG msg;
BOOL bQuit = FALSE;
/* register window class */
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_OWNDC;
wcex.lpfnWndProc = WindowProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = "GLSample";
wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);;
if (!RegisterClassEx(&wcex))
return 0;
/* create main window */
hwnd = CreateWindowEx(0,
"GLSample",
"OpenGL Sample",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
cx,
cy,
NULL,
NULL,
hInstance,
NULL);
RegisterCommandToolWindow();
hInstCommandTool = CreateWindow(szCommandToolClassName, NULL, WS_CHILD | WS_DLGFRAME | WS_VISIBLE | CS_OWNDC,
0, 0, cx, cy, hwnd, NULL, hInstance, NULL);
ShowWindow(hwnd, nCmdShow);
/* enable OpenGL for the window */
EnableOpenGL(hInstCommandTool, &hDC, &hRC);
/* program main loop */
while (!bQuit)
{
/* check for messages */
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
/* handle or dispatch messages */
if (msg.message == WM_QUIT)
{
bQuit = TRUE;
}
else
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
else
{
ChangeSize (cx - 200, cy - 100);
/* OpenGL animation code goes here */
GLfloat x, y, z, angle;
GLfloat xRot = 30.0f;
GLfloat yRot = 30.0f;
GLfloat sizes[2];
GLfloat step;
GLfloat curSize;
glGetFloatv(GL_POINT_SIZE_RANGE, sizes);
glGetFloatv(GL_POINT_SIZE_GRANULARITY, &step);
curSize = sizes[0];
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glRotatef(xRot, 1.0f, 0.0f, 0.0f);
glRotatef(yRot, 0.0f, 1.0f, 0.0f);
glBegin(GL_LINE_STRIP);
glColor3f(1.0f, 0.0f, 0.0f);
z = -200.0f;
for(angle = 0.0f; angle <= (2.0f * M_PI) * 3.0f; angle += 0.1f)
{
x = 100.0f*sin(angle);
y = 100.0f*cos(angle);
glVertex3f(x, y, z);
z += 2.5f;
}
glEnd();
glPopMatrix();
//glFlush();
glEnable(GL_LINE_STIPPLE);
glLineStipple(5, 0x5555);
glBegin(GL_LINE_LOOP);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(-cx/2, cy/2 , 0.0f);
glVertex3f( cx/2, cy/2, 0.0f);
glVertex3f( cx/2,-cy/2, 0.0f);
glVertex3f(-cx/2,-cy/2, 0.0f);
glEnd();
glDisable(GL_LINE_STIPPLE);
SwapBuffers(hDC);
Sleep (1);
}
}
/* shutdown OpenGL */
DisableOpenGL(hInstCommandTool, hDC, hRC);
/* destroy the window explicitly */
DestroyWindow(hwnd);
return msg.wParam;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_CLOSE:
PostQuitMessage(0);
break;
case WM_SIZE:
cx = LOWORD(lParam);
cy = HIWORD(lParam);
if(wParam == SIZE_MINIMIZED) break;
ctx = LOWORD(lParam)* 2 / 3;
cty = HIWORD(lParam)* 2 / 3;
MoveWindow(hInstCommandTool, 0, 0, ctx, cty, TRUE);
UpdateWindow(hInstCommandTool);
break;
case WM_DESTROY:
return 0;
case WM_KEYDOWN:
{
switch (wParam)
{
case VK_ESCAPE:
PostQuitMessage(0);
break;
}
}
break;
default:
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
return 0;
}
LRESULT CALLBACK CommandToolProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_PAINT:
break;
case WM_DESTROY:
PostQuitMessage (0);
break;
default:
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
PIXELFORMATDESCRIPTOR pfd;
int iFormat;
/* get the device context (DC) */
*hDC = GetDC(hwnd);
/* set the pixel format for the DC */
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW |
PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
iFormat = ChoosePixelFormat(*hDC, &pfd);
SetPixelFormat(*hDC, iFormat, &pfd);
/* create and enable the render context (RC) */
*hRC = wglCreateContext(*hDC);
wglMakeCurrent(*hDC, *hRC);
}
void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)
{
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hRC);
ReleaseDC(hwnd, hDC);
} |
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