更新时间:2016-01-23 15:07:05浏览次数:1+次
在画图板有一些基本的多边形工具,可以直接画出来。画出来后,再在多边形上画坐标,这样就可以轻松的确定多个顶点的坐标了。我在画图板确定顶点的效果图如下:
sizeof(pt)/sizeof(pt[0])
sizeof(pt)得到数组总大小,sizeof(pt[0])得到数组中一个点的大小,从而就可以得到点数。这样就省的再去数点的个数了。那么我们程序的绘制多边形区域和填充多边形区域的效果图如下:
#include "windows.h"
#include <tchar.h>
TCHAR txt[100]=_T("C++技术网http://www.cjjjs.com");
// - 项目是Unicode字符集
LRESULT CALLBACK WinProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
static POINT pt[]={100,50,200,50,170,100,200,150,100,150,130,100};
//static POINT pt[]={40,100,80,100,100,50,120,100,160,100,140,150,160,200,120,200,100,250,80,200,40,200,60,150};
switch (message)
{
case WM_PAINT:
{
hdc = BeginPaint(hwnd,&ps);
HRGN hEllipRgn = CreatePolygonRgn(pt,sizeof(pt)/sizeof(pt[0]),ALTERNATE);
FillRgn(hdc,hEllipRgn,(HBRUSH)GetStockObject(LTGRAY_BRUSH));
EndPaint(hwnd,&ps);
DeleteObject(hEllipRgn);
}
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
break;//跳出到默认处理
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrev,LPSTR lpCmd,int iShow)
{
TCHAR ClassName[] = _T("MyClass");
TCHAR title1[] = _T("C++技术网http://www.cjjjs.com");
WNDCLASS wndClass;
wndClass.cbClsExtra=0;
wndClass.cbWndExtra=0;
wndClass.hbrBackground= (HBRUSH)GetStockObject(WHITE_BRUSH);
wndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndClass.hInstance = hInstance;
wndClass.lpfnWndProc = WinProc;
wndClass.lpszClassName = ClassName;
wndClass.lpszMenuName=NULL;
wndClass.style=CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS;
if(!RegisterClass(&wndClass))return 0;
HWND hwnd = CreateWindow(ClassName,title1,WS_OVERLAPPEDWINDOW,10,100,550,400,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,SW_SHOWNORMAL);
MSG msg;
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
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