http://www.oschina.net/code/snippet_103482_14802

看到这个稀奇古怪的语言画国旗，代码真心简洁。试着用C语言实现，确实麻烦不少——主要是数字全要自己算啊。

1.[代码][C/C++]代码

#include

#include

/* Declare Windows procedure */

LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

void DrawFiveStarFlag(HDC hdc, int x, int y, int w);

void DrawFivePointedStar(HDC hdc, int x, int y, int r, float d);

/* Current app instance */

HINSTANCE hInst;

/* Make the class name into a global variable */

TCHAR szClassName[] = TEXT("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 */

/* Save this instance */

hInst = hThisInstance;

/* 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;

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_WINDOW+1);

/* 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 */

TEXT("TestPie"), /* Title Text */

WS_OVERLAPPEDWINDOW, /* default window */

CW_USEDEFAULT, /* Windows decides the position */

0, /* where the window ends up on the screen */

CW_USEDEFAULT, /* The programs width */

0, /* 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)

{

PAINTSTRUCT ps;

HDC hdc;

switch (message) /* handle the messages */

{

case WM_PAINT:

hdc = BeginPaint(hwnd, &ps);

/* TODO: Add any drawing code here... */

DrawFiveStarFlag(hdc, 50, 50, 300);

EndPaint(hwnd, &ps);

break;

case WM_DESTROY:

PostQuitMessage (0); /* send a WM_QUIT to the message queue */

break;

default: /* for messages that we don't deal with */

return DefWindowProc (hwnd, message, wParam, lParam);

}

return 0;

}

/* 画五角星

* 参数：hdc画图句柄，xy中心点坐标，r外圆半径，d偏斜角度(逆时针)

*/

void DrawFivePointedStar(HDC hdc, int x, int y, int r, float d)

{

float r0 = 0.381966*r;//内圆半径：r*sin(0.1*M_PI)/sin(0.7*M_PI)

int i;

POINT p[10];

//计算10个顶点的坐标(72度为实心五角星，144为空心五角星)

for(i=0; i<5; i++)

{

p[2*i].x = x + r*cos((i*72-18+d)*M_PI/180);

p[2*i].y = y + r*sin((i*72-18+d)*M_PI/180);

p[2*i+1].x = x + r0*cos((i*72+18+d)*M_PI/180);

p[2*i+1].y = y + r0*sin((i*72+18+d)*M_PI/180);

}

//画五角星

Polygon(hdc, p, 10);

}

/* 画五星红旗

* 参数：hdc画图句柄，xy旗左上角坐标，w旗宽

*/

void DrawFiveStarFlag(HDC hdc, int x, int y, int w)

{

COLORREF RED = RGB(255, 0, 0), YELLOW = RGB(255, 255, 0);

HPEN hPen1 = CreatePen(PS_SOLID, 1, RED), hPen2 = CreatePen(PS_SOLID, 1, YELLOW);

HBRUSH hBrush1 = CreateSolidBrush(RED), hBrush2 = CreateSolidBrush(YELLOW);

//画旗面

SelectObject(hdc, hPen1);

SelectObject(hdc, hBrush1);

Rectangle(hdc, x, y, x+w, y+2*w/3);

//画5星

SelectObject(hdc, hPen2);

SelectObject(hdc, hBrush2);

DrawFivePointedStar(hdc, x+w/6, y+w/6, w/10, 0);//大星

DrawFivePointedStar(hdc, x+w/3, y+w/15, w/30, 18);//4个小星，倾斜角度都是估的

DrawFivePointedStar(hdc, x+2*w/5, y+2*w/15, w/30, 45);

DrawFivePointedStar(hdc, x+2*w/5, y+7*w/30, w/30, 9);

DrawFivePointedStar(hdc, x+w/3, y+3*w/10, w/30, 27);

DeleteObject(hPen1);

DeleteObject(hPen2);

DeleteObject(hBrush1);

DeleteObject(hBrush2);

}

2.[图片] 1.JPG