Vẽ Marker

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Vẽ Marker

Bài gửi by anbinhtrong on Thu Apr 22, 2010 3:56 am

Bài marker nguyên mẫu:
// Ve Marker.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"

#define MAX_LOADSTRING 100
#define MARKER_SIZE 5
#define MARKER_MAX 100

// 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);

//---------Dinh nghia cac ham--------------
void DrawMarker(HDC hdc, POINT pt, int size);

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_VEMARKER, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

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

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

// 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_VEMARKER);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCSTR)IDC_VEMARKER;
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 POINT apt[MARKER_MAX];
static int napt=0;
int i;

switch (message)
{
case WM_LBUTTONDOWN:
if(napt<MARKER_MAX)
{
apt[napt].x= LOWORD(lParam);
apt[napt].y= HIWORD(lParam);
napt++;
InvalidateRect(hWnd,NULL,TRUE);
}
break;
case WM_RBUTTONDOWN:
napt=0;
InvalidateRect(hWnd,NULL,TRUE);
break;
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_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
RECT rt;
GetClientRect(hWnd, &rt);
DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
//-------Ve Marker------------
for(i=0;i<napt;i++)
DrawMarker(hdc,apt[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 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=0;i<size;i++)
{
InvertPixel(hdc,x+i,y);
InvertPixel(hdc,x-i,y);
InvertPixel(hdc,x,y+i);
InvertPixel(hdc,x,y-i);
}
}
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anbinhtrong
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Đếm số marker

Bài gửi by anbinhtrong on Thu Apr 22, 2010 4:04 am

Ở đây ta dùng hàm wsprintf để gán chuỗi số marker vào cho biến szHello:
Cú pháp:
int wsprintf(
__out LPTSTR lpOut,
__in LPCTSTR lpFmt,
__in ...
);

//-------Dem so Marker------------
wsprintf(szHello,"So marker: %d",napt);
DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
//-------Ve Marker------------
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anbinhtrong
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Tổng số bài gửi : 216
Join date : 05/11/2009
Age : 28
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Tăng giảm kích thước marker

Bài gửi by anbinhtrong on Thu Apr 22, 2010 4:12 am

Dùng sự kiện WM_CHAR để bắt ký tự chữ thường dùng( không phải kí tự đặc biết). Kí tự được lưu trong wParam.
case WM_CHAR:
switch(wParam)
{
case '+': marker_size++;
break;
case '-': if (marker_size>0) marker_size--;
break;
}
InvalidateRect(hWnd,NULL,TRUE);
break;
avatar
anbinhtrong
Admin
Admin

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

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Re: Vẽ Marker

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