-
PolyBezierTo
鎖定
PolyBezierTo用於將當前畫筆位置設為前一條曲線的終點。
- 外文名
- PolyBezierTo
- 用 途
- 將當前畫筆位置設為前條曲線終點
- 函數原型
- BOOL PolyBezierToCONST POINT
- 參數表
- hdc - Long在其中繪圖的設備場景
PolyBezierTo聲明
Declare Function PolyBezierTo Lib "gdi32" (ByVal hdc As Long, lppt As POINTAPI, ByVal cCount As Long) As Long
PolyBezierTo説明
描繪一條或多條貝塞爾（Bezier）曲線。
PolyBezierTo函數原型
(BOOL PolyBezierToHDChdc,CONST POINT*lppt,DWORDcCount);
PolyBezierTo參數表
hdc ------------ Long，要在其中繪圖的設備場景
lppt ----------- POINTAPI，指定一個POINTAPI結構數組。其中的第一個結構指定了起點。剩下的點三個一組——包括兩個控件點和一個終點
原文：An array of POINTAPI structures. The first structure
specifies the starting point. The remaining points are in groups of three, consisting of
two control points and an end point.
cPoints
Long，lppt數組的總點數
PolyBezierTo返回值
Long，非零表示成功，零表示失敗
PolyBezierTo代碼示例
#include<windows.h>
LRESULTCALLBACKWndProc(HWND,UINT,WPARAM,LPARAM);
LRESULTCALLBACKWndProc(HWND,UINT,WPARAM,LPARAM);
intWINAPIWinMain(HINSTANCEhInstance,HINSTANCEhPrevInstance,PSTRszCmdLine,intiCmdShow)
{
staticTCHARszAppName[]=TEXT("SysMets");
HWNDhwnd;
MSGmsg;
WNDCLASSwndclass;
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("ProgramrequiresWindowsNT!"),szAppName,MB_ICONERROR);
return0;
}
hwnd=CreateWindow(szAppName,TEXT("GetSystemMetrics"),
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);
}
returnmsg.wParam;
}
voidDrawBezier(HDChdc,POINTapt[])
{
MoveToEx(hdc,apt[0].x,apt[0].y,NULL);
POINTszApt[]={apt[1],apt[2],apt[3]};
PolyBezierTo(hdc,szApt,3);
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);
}
LRESULTCALLBACKWndProc(HWNDhwnd,UINTmessage,WPARAMwParam,LPARAMlParam)
{
staticintcxClient,cyClient;
HDChdc;
staticPOINTapt[4];
PAINTSTRUCTps;
switch(message)
{
caseWM_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;
break;
caseWM_LBUTTONDOWN:
caseWM_RBUTTONDOWN:
caseWM_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);
}
return0;
caseWM_PAINT:
InvalidateRect(hwnd,NULL,TRUE);
hdc=BeginPaint(hwnd,&ps);
DrawBezier(hdc,apt);
EndPaint(hwnd,&ps);
return0;
caseWM_DESTROY:
PostQuitMessage(0);
return0;
}
returnDefWindowProc(hwnd,message,wParam,lParam);
}
結果顯示
PolyBezierTo
- 詞條統計
-
- 瀏覽次數：次
- 編輯次數：13次歷史版本
- 最近更新： 勤奋的CKY0821