/*------------------------------------------------------------------------
DEVCAPS1.C -- Device Capabilities Display Program No. 1
(c) Charles Petzold, 1998
----------------------------------------------------------------------*/
#include <windows.h>
#include<cmath>
#define NUM 1000
#define TWO_PI (2*3.14159)
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
void DrawRectangle(HWND);
int cxClient, cyClient;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Bezier") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc= WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox ( NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow ( szAppName, TEXT ("Draw a Clover"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
/*
while(TRUE){
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
if(msg.message == WM_QUIT) break;
TranslateMessage(&msg);
DispatchMessage(&msg);
}else
{
DrawRectangle(hwnd);//没有消息的时候
}
}*/
return msg.wParam ;
}
void DrawBezier(HDC hdc, POINT apt[]){
PolyBezier(hdc, apt, 4);
MoveToEx(hdc, apt[0].x, apt[0].y,NULL);
LineTo(hdc, apt[1].x ,apt[1].y);
MoveToEx(hdc, apt[2].x, apt[2].y, NULL);
LineTo(hdc, apt[3].x, apt[3].y);
}
void Draw(HWND hwnd, HDC hdc){
RECT rect;
GetClientRect(hwnd, &rect);
for(int x = 0; x< rect.right;x+=10){
MoveToEx(hdc, x, 0, NULL);
LineTo(hdc, x, rect.bottom);
}
for(int y = 0; y< rect.bottom; y+=10){
MoveToEx(hdc, 0, y, NULL);
LineTo(hdc, rect.right, y);
}
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
//static int cxClient, cyClient;
static HRGN hRgnClip;
double fAngle, fRadius;
HCURSOR hCursor;
HDC hdc ;
int i ;
HRGN hRgnTemp[6];
PAINTSTRUCT ps ;
TEXTMETRIC tm ;
switch (message)
{
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
hCursor = SetCursor(LoadCursor(NULL, IDC_WAIT));
ShowCursor(TRUE);
if(hRgnClip) DeleteObject(hRgnClip);
hRgnTemp[0] = CreateEllipticRgn(0, cyClient/3,
cxClient/2, 2 * cyClient/3);
hRgnTemp[1] = CreateEllipticRgn(cxClient/2,cyClient/3,
cxClient, 2 * cyClient/3);
hRgnTemp[2] = CreateEllipticRgn (cxClient / 3, 0,
2 * cxClient / 3, cyClient / 2) ;
hRgnTemp[3] = CreateEllipticRgn (cxClient / 3, cyClient / 2,
2 * cxClient / 3, cyClient) ;
hRgnTemp[4] = CreateRectRgn (0, 0, 1, 1) ;
hRgnTemp[5] = CreateRectRgn (0, 0, 1, 1) ;
hRgnClip = CreateRectRgn (0, 0, 1, 1) ;
CombineRgn(hRgnTemp[4], hRgnTemp[0], hRgnTemp[1],RGN_OR);
CombineRgn(hRgnTemp[5], hRgnTemp[2], hRgnTemp[3],RGN_OR);
CombineRgn(hRgnClip, hRgnTemp[4], hRgnTemp[5], RGN_XOR);
for(i = 0; i< 6; i++) DeleteObject(hRgnTemp[i]);
SetCursor(hCursor);
ShowCursor(FALSE);
return 0;
case WM_PAINT:
//InvalidateRect(hwnd, NULL, TRUE);
hdc = BeginPaint(hwnd, &ps);
SetViewportOrgEx(hdc, cxClient/2, cyClient/2, NULL);
SelectClipRgn(hdc, hRgnClip);
fRadius = _hypot(cxClient/2.0, cyClient / 2.0);
for(fAngle = 0.0; fAngle < TWO_PI; fAngle += TWO_PI/360)
{
MoveToEx(hdc, 0, 0, NULL);
LineTo(hdc, (int)(fRadius * cos(fAngle) + 0.5),
(int)(-fRadius* sin(fAngle) + 0.5));
}
/*矩形函数:
FillRect (hdc, &rect, hBrush) ;
FrameRect (hdc, &rect, hBrush) ;
InvertRect (hdc, &rect) ;
SetRect (&rect, xLeft, yTop, xRight, yBottom) ;
将矩形沿x轴和y轴移动几个单元:OffsetRect (&rect, x, y) ;
增减矩形的尺寸:InflateRect (&rect, x, y) ;
矩形各字段设定为0:SetRectEmpty (&rect) ;
将矩形复制给另一个矩形:CopyRect (&DestRect, &SrcRect) ;
取得两个矩形的交集:IntersectRect (&DestRect, &SrcRect1, &SrcRect2) ;
取得两个矩形的联集:UnionRect (&DestRect, &SrcRect1, &SrcRect2) ;
确定矩形是否为空:bEmpty = IsRectEmpty (&rect) ;
确定点是否在矩形内:bInRect = PtInRect (&rect, point) ;
您可以用下列叙述来替代CopyRect函数调用:DestRect = SrcRect ;
*/
EndPaint(hwnd, &ps);
return 0 ;
case WM_DESTROY:
DeleteObject(hRgnClip);
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
void DrawRectangle(HWND hwnd)
{
HBRUSH hBrush;
HDC hdc;
RECT rect;
if(cxClient==0 || cyClient == 0)return ;
SetRect(&rect, rand()% cxClient, rand() % cyClient,
rand()% cxClient, rand() % cyClient);
hBrush = CreateSolidBrush( RGB(rand() % 256, rand()%256, rand() % 256));
hdc = GetDC(hwnd);
FillRect(hdc, &rect, hBrush);
//Sleep(10);
ReleaseDC(hwnd, hdc);
DeleteObject(hBrush);
}
