Vẽ ngôi sao

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Vẽ ngôi sao

Bài gửi by anbinhtrong on Thu Apr 22, 2010 4:24 am

// win_2_4.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"
#include <math.h>
#include <time.h>

#define MAX_LOADSTRING 100
#define max_marker 1000
#define marker_size 5
#define MAX_RGB 255

//-----Dinh nghia struct Ngoi sao---------

struct NgoiSao{
POINT Tam;
double bk;
COLORREF PenColor;
COLORREF BrushColor;
};

void InvertPixel(HDC hdc, int x, int y);
void Drawmarker(HDC hdc,POINT p, int sixe);
void VeNgoiSao(HDC hdc, NgoiSao ns, int SoCanhNgoiSao, int GocNghieng);

// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text

// Foward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;

// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_WIN_2_4, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_WIN_2_4);

// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return msg.wParam;
}



//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage is only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_WIN_2_4);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCSTR)IDC_WIN_2_4;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

return RegisterClassEx(&wcex);
}

//
// FUNCTION: InitInstance(HANDLE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;

hInst = hInstance; // Store instance handle in our global variable

hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

if (!hWnd)
{
return FALSE;
}

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

return TRUE;
}

//
// FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
int i,r;
static POINT apt[max_marker];
static int nmarkers=0;
//----------Mang chua cac ngoi sao------
static NgoiSao ns[100];
static int nns;

switch (message)
{
case WM_CREATE:
srand(time(NULL));
break;
case WM_LBUTTONDOWN:
if(nmarkers <= max_marker)
{
apt[nmarkers].x=LOWORD(lParam);
apt[nmarkers].y=HIWORD(lParam);
if((nmarkers+1)%2==0) // Tinh ban kinh
{
r=(int)sqrt(pow(apt[nmarkers].x-apt[nmarkers-1].x,2)
+
pow(apt[nmarkers].y-apt[nmarkers-1].y,2));
ns[nns].bk=r;
ns[nns].PenColor=RGB(rand()%MAX_RGB,rand()%MAX_RGB,rand()%MAX_RGB);
ns[nns].BrushColor=RGB(rand()%MAX_RGB,rand()%MAX_RGB,rand()%MAX_RGB);
nns++;
}
else
ns[nns].Tam=apt[nmarkers];
nmarkers++;
InvalidateRect(hWnd, NULL, TRUE);
}
break;

case WM_RBUTTONDOWN:
nmarkers=0;
nns=0;
InvalidateRect(hWnd, NULL, TRUE);
break;

case WM_PAINT:
hdc=BeginPaint(hWnd, &ps);
for(i=0; i<nmarkers; i++)
Drawmarker(hdc, apt[i], marker_size);
for(i=0;i<nns;i++)
VeNgoiSao(hdc,ns[i],5,0);
EndPaint(hWnd, &ps);
break;

case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

void VeNgoiSao(HDC hdc, NgoiSao ns, int SoCanhNgoiSao, int GocNghieng)
{
HBRUSH hbr;
HPEN hpen;
hpen=CreatePen(PS_SOLID,3,ns.PenColor);
hbr=CreateSolidBrush(ns.BrushColor);
SelectObject(hdc,hpen);
SelectObject(hdc,hbr);
SetPolyFillMode(hdc,WINDING);
int Angle=360/SoCanhNgoiSao;
int i;
double PI=3.14;
double RAD=PI/180;
POINT *P,*Q;
P=new POINT[SoCanhNgoiSao];
Q=new POINT[SoCanhNgoiSao+1];
for(i=0;i<SoCanhNgoiSao;i++)
{
P[i].x=(long)(ns.Tam.x + cos((i*Angle-90-GocNghieng)*RAD)*ns.bk);
P[i].y=(long)(ns.Tam.y + sin((i*Angle-90-GocNghieng)*RAD)*ns.bk);
}
// Drawmarker(hdc,P[0],5);
int OrderDraw[6]={3,0,2,4,1,3};
for(i=0;i<6;i++)
Q[i]=P[OrderDraw[i]];
Polygon(hdc,Q,SoCanhNgoiSao+1);
DeleteObject(hpen);
DeleteObject(hbr);
}

void InvertPixel(HDC hdc, int x, int y)
{
COLORREF crColor=GetPixel(hdc, x, y);
SetPixel(hdc, x, y, ~crColor &RGB(255,255,255));
}

void Drawmarker(HDC hdc, POINT pt, int size)
{
int i, x=pt.x, y=pt.y;
InvertPixel(hdc, x, y);
for(i=1; i<size; i++)
{
InvertPixel(hdc, x-i, y);
InvertPixel(hdc, x+i, y);
InvertPixel(hdc, x, y-i);
InvertPixel(hdc, x, y+i);
}
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
return TRUE;

case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return TRUE;
}
break;
}
return FALSE;
}

anbinhtrong
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Re: Vẽ ngôi sao

Bài gửi by anbinhtrong on Thu Apr 22, 2010 5:42 am

Dùng ALTERNATE: tô theo dòng kẻ quét
SetPolyFillMode(hdc,ALTERNATE);

anbinhtrong
Admin
Admin

Tổng số bài gửi : 216
Join date : 05/11/2009
Age : 28
Đến từ : BT

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