Vẽ bông hoa

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Vẽ bông hoa

Bài gửi by anbinhtrong on Thu Apr 22, 2010 7:41 am

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

#include "stdafx.h"
#include "resource.h"
#include "math.h"
#define MAX_LOADSTRING 100
#define MAX_MARKERS 100
#define MARKER_SIZE 5
struct BongHoa{
POINT Tam;
POINT DiemDieuKhien;
COLORREF MauVien;
COLORREF MauTo;
};
void DrawMarker(HDC hdc,POINT pt,int size);
void DrawFlower(HDC hdc,BongHoa phoa,int SoCanh,int GocNghieng);
POINT QuayDiem(POINT Tam,POINT p,int GocQuay);
// 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_BONGHOA, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

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

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

// 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_BONGHOA);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCSTR)IDC_BONGHOA;
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)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
TCHAR szHello[MAX_LOADSTRING];
LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);
static BongHoa bh[100];
static int sbh=0;
static POINT Marker[MAX_MARKERS];
static int nMarker=0;
int i;
double pi=3.1415926;
switch(message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_LBUTTONDOWN:
Marker[nMarker].x=LOWORD(lParam);
Marker[nMarker].y=HIWORD(lParam);
if((nMarker%2)==1)
{
bh[sbh].Tam=Marker[nMarker-1];
bh[sbh].DiemDieuKhien=Marker[nMarker];
bh[sbh].MauTo=RGB(rand()%255,rand()%255,rand()%255);
bh[sbh].MauVien=RGB(rand()%255,rand()%255,rand()%255);
sbh++;
}
nMarker++;
InvalidateRect(hWnd,NULL,TRUE);
break;
case WM_RBUTTONDOWN:
sbh=0;
nMarker=0;
InvalidateRect(hWnd, NULL, TRUE);
break;
case WM_PAINT:

hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
RECT rt;
GetClientRect(hWnd, &rt);
DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
for(i=0;i<sbh;i++)
DrawFlower(hdc,bh[i],4,0);
for(i=0;i<nMarker;i++)
DrawMarker(hdc,Marker[i],MARKER_SIZE);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

// 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;
}
void DrawMarker(HDC hdc,POINT pt,int size)
{
SetPixel(hdc,pt.x,pt.y,RGB(255,0,0));
for(int i=0;i<size;i++)
{
SetPixel(hdc,pt.x+i,pt.y,RGB(255,0,0));
SetPixel(hdc,pt.x-i,pt.y,RGB(255,0,0));
SetPixel(hdc,pt.x,pt.y+i,RGB(255,0,0));
SetPixel(hdc,pt.x,pt.y-i,RGB(255,0,0));
}
}
//quay diem ko sai
POINT QuayDiem(POINT Tam,POINT p,int GocQuay)
{
double pi=3.1415926;
POINT a;
double R=sqrt(pow(p.x-Tam.x,2)+pow(p.y-Tam.y,2));
double goc=acos((double)(p.x-Tam.x)/R);
goc=(p.y<=Tam.y)?2*pi-goc:goc;
goc=goc+GocQuay*pi/180;
a.x=Tam.x+(long)(R*cos(goc));
a.y=Tam.y+(long)(R*sin(goc));
return a;
}
void DrawFlower(HDC hdc,BongHoa phoa,int SoCanh,int GocNghieng)
{
HBRUSH hbr;
HPEN hp;
int i;
hp=CreatePen(PS_SOLID,2,phoa.MauVien);
hbr=CreateSolidBrush(phoa.MauTo);
SelectObject(hdc,hp);
SelectObject(hdc,hbr);
BeginPath(hdc);
double pi=3.1415926;
POINT *b;
b=new POINT[3*SoCanh];
b[2]=phoa.Tam;
b[0]=phoa.DiemDieuKhien;
b[1].x=(2*phoa.Tam.x-phoa.DiemDieuKhien.x);
b[1].y=b[0].y;

int GocQuay=360/SoCanh;
int j=1;
for(i=3;i<3*SoCanh;i+=3,j++)
{
b[i]=QuayDiem(phoa.Tam,b[0],j*GocQuay);
b[i+1]=QuayDiem(phoa.Tam,b[1],j*GocQuay);
b[i+2]=QuayDiem(phoa.Tam,b[2],j*GocQuay);
}
for(i=0;i<3*SoCanh;i++)
b[i]=QuayDiem(phoa.Tam,b[i],GocNghieng);
MoveToEx(hdc,phoa.Tam.x,phoa.Tam.y,NULL);
PolyBezierTo(hdc,b,3*SoCanh);
CloseFigure(hdc);
EndPath(hdc);
StrokeAndFillPath(hdc);
DeleteObject(hp);
DeleteObject(hbr);
}
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anbinhtrong
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Re: Vẽ bông hoa

Bài gửi by anbinhtrong on Thu Apr 22, 2010 8:02 am

Trường hợp thêm góc nghiêng và tăng số cánh hoa, bạn bổ sung:
case WM_KEYDOWN:
switch(wParam)
{
case VK_LEFT:
if(socanh>3) socanh--;
break;
case VK_RIGHT:
if(socanh<15) socanh++;
break;
case VK_UP:
GocNghieng+=10;
break;
case VK_DOWN:
GocNghieng-=10;
break;
}
InvalidateRect(hWnd,NULL,TRUE);
break;

Lưu ý: bạn nên sửa lại tham số hàm WM_PAINT cho phù hợp.
avatar
anbinhtrong
Admin
Admin

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

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