#include <windows.h>
#include <math.h>

#define PI	3.14159265

LRESULT CALLBACK WindowProcedure ( HWND, UINT, WPARAM, LPARAM );
void OnPaint ( HDC );

void DrawLine ( HDC, int, int, int, int );
void DrawFlower ( HDC, int, int, COLORREF );
void DrawTie ( HDC, int, int, COLORREF );


int WINAPI WinMain ( HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nFunsterStil )
{
	char szClassName[] = TEXT ( "DrawFlower" );
	HWND hwnd;
	MSG msg;
	WNDCLASSEX wc = { 0 };

	wc.hInstance = hThisInstance;
	wc.lpszClassName = szClassName;
	wc.lpfnWndProc = WindowProcedure;
	wc.style = CS_DBLCLKS;
	wc.cbSize = sizeof ( WNDCLASSEX );

	wc.hIcon = LoadIcon ( NULL, IDI_APPLICATION );
	wc.hIconSm = LoadIcon ( NULL, IDI_APPLICATION );
	wc.hCursor = LoadCursor ( NULL, IDC_ARROW );
	wc.hbrBackground = ( HBRUSH ) ( COLOR_WINDOW+1 );

	if ( !RegisterClassEx ( &wc ) ) return 0;

	hwnd = CreateWindowEx ( 0, szClassName, szClassName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, HWND_DESKTOP, NULL, hThisInstance, NULL );
	ShowWindow ( hwnd, nFunsterStil );

	while ( GetMessage ( &msg, NULL, 0, 0 ) )
	{
		TranslateMessage ( &msg );
		DispatchMessage ( &msg );
	}

	return msg.wParam;
}

LRESULT CALLBACK WindowProcedure ( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
	PAINTSTRUCT ps;
	HDC hdc;

	switch ( msg )
	{
	case WM_PAINT:
		hdc = BeginPaint ( hwnd, &ps );
		OnPaint ( hdc );
		EndPaint ( hwnd, &ps );
		break;

	case WM_DESTROY:
		PostQuitMessage ( 0 );
		break;

	default:
		return DefWindowProc ( hwnd, msg, wParam, lParam );
	}

	return 0;
}

void OnPaint ( HDC hdc )
{
	HPEN h;

	// 画蝴蝶结
	DrawTie ( hdc, 195, 354, RGB ( 255,0,255 ) );

	// 画枝干
	h = CreatePen ( PS_SOLID, 1, RGB ( 0,255,0 ) );
	SelectObject ( hdc, h );

	DrawLine ( hdc, 189, 372, 180, 400 );
	DrawLine ( hdc, 310, 160, 325,  68 );
	DrawLine ( hdc, 310, 160, 187, 374 );
	DrawLine ( hdc, 150, 140, 189, 374 );
	DrawLine ( hdc, 430, 176, 190, 374 );
	DrawLine ( hdc, 370, 110, 187, 374 );
	DrawLine ( hdc, 250,  72, 189, 372 );
	DrawLine ( hdc, 253, 192, 190, 374 );
	DrawLine ( hdc, 189, 372, 187, 400 );
	DrawLine ( hdc, 189, 372, 182, 400 );
	DrawLine ( hdc, 189, 372, 200, 120 );

	DeleteObject ( h );

	// 画花朵
	DrawFlower ( hdc, 320, 160, RGB ( 255,0,0 ) );
	DrawFlower ( hdc, 200, 120, RGB ( 0,255,0 ) );
	DrawFlower ( hdc, 150, 140, RGB ( 0,0,255 ) );
	DrawFlower ( hdc, 430, 176, RGB ( 255, 127, 0 ) );
	DrawFlower ( hdc, 370, 110, RGB ( 239, 179, 52 ) );
	DrawFlower ( hdc, 250,  72, RGB ( 235, 95, 186 ) );
	DrawFlower ( hdc, 325,  68, RGB ( 228, 119, 98 ) );
	DrawFlower ( hdc, 253, 190, RGB ( 247, 169, 117 ) );
}

// 画花朵
void DrawFlower ( HDC hdc, int x, int y, COLORREF c )
{
	int x1, y1, x2, y2;
	const int d = 30;
	double a, e;
	HPEN h;

	h = CreatePen ( PS_SOLID, 1, c );
	SelectObject ( hdc, h );

	for ( a = 0; a < 2 * PI; a += PI / 360 )
	{
		e = d * ( 1 + sin ( a * 5 ) );
		x1 = ( int ) ( x + e * cos ( a ) );
		y1 = ( int ) ( y + e * sin ( a ) );
		x2 = ( int ) ( x + e * cos ( a + PI / 5 ) );
		y2 = ( int ) ( y + e * sin ( a + PI / 5 ) );
		DrawLine ( hdc, x1, y1, x2, y2 );
	}

	DeleteObject ( h );
}

// 画蝴蝶结
void DrawTie ( HDC hdc, int x, int y, COLORREF c )
{
	int x1, y1, x2, y2;
	const int d = 100;
	double a, e;
	HPEN h;

	h = CreatePen ( PS_SOLID, 1, c );
	SelectObject ( hdc, h );

	for ( a = 0; a < 2 * PI; a += PI / 360 )
	{
		e = d * ( 1 + sin ( a * 4 ) );
		x1 = ( int ) ( x + e * cos ( a ) );
		y1 = ( int ) ( y + e * sin ( a ) / 2 );
		x2 = ( int ) ( x + e * cos ( a + PI / 9 ) );
		y2 = ( int ) ( y + e * sin ( a + PI / 9 ) / 4.5 );
		DrawLine ( hdc, x1, y1, x2, y2 );
	}

	DeleteObject ( h );
}

//画线
void DrawLine ( HDC hdc, int x1, int y1, int x2, int y2 )
{
	MoveToEx ( hdc, x1, y1, NULL );
	LineTo ( hdc, x2, y2 );
}