出于好玩，一个小代码：
#include <windows.h>
#include <cmath>
#define PI 3.1415926
class Pentacle
{
private:
POINT points[5];
POINT mittel;
double length;
public:
Pentacle(){}
Pentacle(const POINT & mP, const double l);
void createPentacle(const POINT & mP, const double l);
void paint1(HDC, HWND);
void paint2(HDC, HWND);
void paint3(HDC, HWND);
};
Pentacle::Pentacle(const POINT & mP, const double l)
{
mittel = mP;
length = l;
for(int i = 0; i<5; i++)
{
points[i].x = (LONG)(length/2/sin(36*PI/180)*sin(i*72*PI/180) + mittel.x);
points[i].y = (LONG)(length/2/sin(36*PI/180)*cos(i*72*PI/180) + mittel.y);
}
}
void Pentacle::createPentacle(const POINT & mP, const double l)
{
mittel = mP;
length = l;
for(int i = 0; i<5; i++)
{
points[i].x = (LONG)(length/2/sin(36*PI/180)*sin(i*72*PI/180) + mittel.x);
points[i].y = (LONG)(length/2/sin(36*PI/180)*cos(i*72*PI/180) + mittel.y);
}
}
void Pentacle::paint1(HDC hDC, HWND hWnd)
{
//PAINTSTRUCT ps;
//HDC hDC = BeginPaint(hWnd, &ps);
HPEN hPen = CreatePen(PS_SOLID, 2, RGB(255, 0, 0));
SelectObject(hDC, hPen);
POINT points[6];// = {{100,100}, {129,121}, {118,154},{82,154},{71,121},{100,100}};
for(int i = 0; i<5; i++)
{
points[i] = Pentacle::points[i];
}
points[5] = Pentacle::points[0];
Polyline(hDC, points, 6);
DeleteObject(hPen);
//EndPaint(hWnd, &ps);
}
void Pentacle::paint2(HDC hDC, HWND hWnd)
{
POINT points[6];// = {{100,100}, {129,121}, {118,154},{82,154},{71,121},{100,100}};
for(int i = 0; i<5; i++)
{
points[i] = Pentacle::points[i];
}
points[5] = Pentacle::points[0];
HPEN hPen = CreatePen(PS_SOLID, 2, RGB(255, 0, 0));
SelectObject(hDC, hPen);
MoveToEx(hDC, points[0].x, points[0].y, NULL);
LineTo(hDC, points[2].x, points[2].y);
DeleteObject(hPen);
hPen = CreatePen(PS_SOLID, 2, RGB(0, 255, 0));
SelectObject(hDC, hPen);
LineTo(hDC, points[4].x, points[4].y);
DeleteObject(hPen);
hPen = CreatePen(PS_SOLID, 2, RGB(0, 0, 255));
SelectObject(hDC, hPen);
LineTo(hDC, points[1].x, points[1].y);
DeleteObject(hPen);
hPen = CreatePen(PS_SOLID, 2, RGB(125, 125, 125));
SelectObject(hDC, hPen);
LineTo(hDC, points[3].x, points[3].y);
DeleteObject(hPen);
hPen = CreatePen(PS_SOLID, 2, RGB(0, 0, 125));
SelectObject(hDC, hPen);
LineTo(hDC, points[0].x, points[0].y);
DeleteObject(hPen);
}
void Pentacle::paint3(HDC hDC, HWND hWnd)
{
POINT points[6];// = {{100,100}, {129,121}, {118,154},{82,154},{71,121},{100,100}};
for(int i = 0; i<5; i++)
{
points[i] = Pentacle::points[i];
}
points[5] = Pentacle::points[0];
HBRUSH hBrush = CreateSolidBrush(RGB(0, 128, 255));
SelectObject(hDC, hBrush);
Polygon(hDC, points, 6);
DeleteObject(hBrush);
}
/*
Declare Windows procedure
*/
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
/*
Make the class name into a global variable
*/
char szClassName[ ] = "WindowsApp";
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)
{
HWND
hwnd;
/* This is the handle for our window */
MSG
messages;
/* Here messages to the application are saved */
WNDCLASSEX wincl;
/* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure;
/* This function is called by windows */
wincl.style =
CS_DBLCLKS;
/* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName =
NULL;
/* No menu */
wincl.cbClsExtra =
0;
/* No extra bytes after the window class */
wincl.cbWndExtra =
0;
/* structure or the window instance */
/* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0,
/* Extended possibilites for variation */
szClassName,
/*
Classname */
"Pentacle",
/* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT,
/* Windows decides
the position */
CW_USEDEFAULT,
/* where the window
ends up on the screen */
544,
/* The programs width */
375,
/* and height in pixels */
HWND_DESKTOP,
/* The window
is a child-window to desktop */
NULL,
/* No menu */
hThisInstance,
/* Program Instance
handler */
NULL
/* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nFunsterStil);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/*
This function is called by the Windows function DispatchMessage()
*/
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
HPEN hPen;
POINT mittel;
POINT points[6];
int length;
Pentacle myPentacle;
switch
(message)
/* handle the messages */
{
case WM_DESTROY:
PostQuitMessage (0);
/* send a
WM_QUIT to the message queue */
break;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
mittel.x = 150;
mittel.y = 150;
length = 150;
myPentacle.createPentacle(mittel, length);
myPentacle.paint1(hdc, hwnd);
myPentacle.paint3(hdc, hwnd);
myPentacle.paint2(hdc, hwnd);
EndPaint(hwnd, &ps);
break;
default:
/* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
