标签：static amp val post 函数 err const appname cal
函数 Rectangle ,Ellipse, RoundRect 介绍：
Rectangle() 功能：该函数画一个矩形，可以用当前的画笔画矩形轮廓，用当前画刷进行填充 (默认画刷为白色)。
Ellipse() 功能：该函数用于画一个椭圆，椭圆的中心是限定矩形的中心。
使用当前画笔画椭圆，用当前的画刷填充椭圆 (默认画刷为白色)
RoundRect() 功能：该函数画一个带圆角的矩形，此矩形由当前画笔画轮廓，由当前画刷填充 (默认画刷为白色)。
Rectangle() 原型：BOOL Rectangle(HDC hdc, int nLeftRect, int nTopRect, int nRightRect, int nBottomRect) ;
Ellipse() 原型：BOOL Rectangle(HDC hdc, int nLeftRect, int nTopRect, int nRightRect, int nBottomRect) ;
RoundRect() 原型：BOOL RoundRect(HDC hdc, int nLeftRect, int nTopRect, int nRightRect, int nBottomRect,
int nWidth, int nHeight)；
参数：
#include <windows.h> LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("LineDemo") ; 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 ("Program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow (szAppName, TEXT ("Line Demonstration"), 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) ; } return msg.wParam ; } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static int cxClient, cyClient ; HDC hdc ; PAINTSTRUCT ps ; switch (message) { case WM_SIZE: cxClient = LOWORD (lParam) ; cyClient = HIWORD (lParam) ; return 0 ; case WM_PAINT: hdc = BeginPaint (hwnd, &ps) ;
Rectangle (hdc, cxClient / 8, cyClient / 8, 7 * cxClient / 8, 7 * cyClient / 8) ;
MoveToEx (hdc, 0, 0, NULL) ; LineTo (hdc, cxClient, cyClient) ; MoveToEx (hdc, 0, cyClient, NULL) ; LineTo (hdc, cxClient, 0) ; Ellipse (hdc, cxClient / 8, cyClient / 8, 7 * cxClient / 8, 7 * cyClient / 8) ; RoundRect (hdc, cxClient / 4, cyClient / 4, 3 * cxClient / 4, 3 * cyClient / 4, cxClient / 4, cyClient / 4) ; EndPaint (hwnd, &ps) ; return 0 ; case WM_DESTROY: PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; }
函数 PolyBezier, PolyBezierTo 介绍：
功能：函数 PolyBezier 和 PolyBezier 用于绘制贝塞尔曲线 。
PolyBezier() 原型：BOOL PolyBezier(HDC hdc, CONST POINT *lppt, DWORD cPoints);
PolyBezierTo() 原型：BOOL PolyBezier(HDC hdc, CONST POINT *lppt, DWORD cPoints);
#include <windows.h> LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; 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 ("Program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow (szAppName, TEXT ("Bezier Splines"), 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) ; } 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) ; } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static POINT apt[4] ; HDC hdc ; int cxClient, cyClient ; PAINTSTRUCT ps ; switch (message) { case WM_SIZE: cxClient = LOWORD (lParam) ; cyClient = HIWORD (lParam) ; apt[0].x = cxClient / 4 ; apt[0].y = cyClient / 2 ; apt[1].x = cxClient / 2 ; apt[1].y = cyClient / 4 ; apt[2].x = cxClient / 2 ; apt[2].y = 3 * cyClient / 4 ; apt[3].x = 3 * cxClient / 4 ; apt[3].y = cyClient / 2 ; return 0 ; case WM_LBUTTONDOWN: case WM_RBUTTONDOWN: case WM_MOUSEMOVE: if (wParam & MK_LBUTTON || wParam & MK_RBUTTON) { hdc = GetDC (hwnd) ; SelectObject (hdc, GetStockObject (WHITE_PEN)) ; DrawBezier (hdc, apt) ; if (wParam & MK_LBUTTON) { apt[1].x = LOWORD (lParam) ; apt[1].y = HIWORD (lParam) ; } if (wParam & MK_RBUTTON) { apt[2].x = LOWORD (lParam) ; apt[2].y = HIWORD (lParam) ; } SelectObject (hdc, GetStockObject (BLACK_PEN)) ; DrawBezier (hdc, apt) ; ReleaseDC (hwnd, hdc) ; } return 0 ; case WM_PAINT: InvalidateRect (hwnd, NULL, TRUE) ; hdc = BeginPaint (hwnd, &ps) ; DrawBezier (hdc, apt) ; EndPaint (hwnd, &ps) ; return 0 ; case WM_DESTROY: PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ; }
标签：static amp val post 函数 err const appname cal
原文地址：https://www.cnblogs.com/M-Anonymous/p/9302980.html
