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CreateHatchBrush function

The CreateHatchBrush function creates a logical brush that has the specified hatch pattern and color.

Syntax


HBRUSH CreateHatchBrush(
  _In_  int fnStyle,
  _In_  COLORREF clrref
);

Parameters

fnStyle [in]

The hatch style of the brush. This parameter can be one of the following values.

ValueMeaning
HS_BDIAGONAL

45-degree upward left-to-right hatch

HS_CROSS

Horizontal and vertical crosshatch

HS_DIAGCROSS

45-degree crosshatch

HS_FDIAGONAL

45-degree downward left-to-right hatch

HS_HORIZONTAL

Horizontal hatch

HS_VERTICAL

Vertical hatch

 

clrref [in]

The foreground color of the brush that is used for the hatches. To create a COLORREF color value, use the RGB macro.

Return value

If the function succeeds, the return value identifies a logical brush.

If the function fails, the return value is NULL.

Remarks

A brush is a bitmap that the system uses to paint the interiors of filled shapes.

After an application creates a brush by calling CreateHatchBrush, it can select that brush into any device context by calling the SelectObject function. It can also call SetBkMode to affect the rendering of the brush.

If an application uses a hatch brush to fill the backgrounds of both a parent and a child window with matching color, you must set the brush origin before painting the background of the child window. You can do this by calling the SetBrushOrgEx function. Your application can retrieve the current brush origin by calling the GetBrushOrgEx function.

When you no longer need the brush, call the DeleteObject function to delete it.

ICM: No color is defined at brush creation. However, color management is performed when the brush is selected into an ICM-enabled device context.

Examples

The following example creates a logical brush that has the specified hatch pattern and color. You can also set a hatch brush background to transparent or to opaque.



#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <tchar.h>
#include <stddef.h>


#include <gdiplus.h>
#include <assert.h>

using namespace Gdiplus;

// Reference to the GDI+ static library).
#pragma comment (lib,"Gdiplus.lib")

// Global variables

// The main window class name.
static TCHAR szWindowClass[] = _T("win32app");


// The string that appears in the application's title bar.
static TCHAR szTitle[] = _T("Win32 Application Hatch Brush");

HINSTANCE hInst;

#define BTN_MYBUTTON_ID_1    503
#define BTN_MYBUTTON_ID_2    504


// Forward declarations of functions included in this code module:
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    UNREFERENCED_PARAMETER(lpCmdLine);
    UNREFERENCED_PARAMETER(hPrevInstance);

    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

    if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

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

    // The parameters to CreateWindow:
    // szWindowClass: the name of the application
    // szTitle: the text that appears in the title bar
    // WS_OVERLAPPEDWINDOW: the type of window to create
    // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
    // 500, 100: initial size (width, length)
    // NULL: the parent of this window
    // NULL: this application does not have a menu bar
    // hInstance: the first parameter from WinMain
    // NULL: not used in this application
    HWND hWnd = CreateWindow(
        szWindowClass,
        szTitle,
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,
        1000, 500,
        NULL,
        NULL,
        hInstance,
        NULL
    );

    if (!hWnd)
    {
        MessageBox(NULL,
            _T("Call to CreateWindow failed!"),
            _T("Win32 Guided Tour"),
            NULL);

        return 1;
    }

    // Create button controls.
    CreateWindowEx(NULL, L"BUTTON", L"Transparent", WS_VISIBLE | WS_CHILD,
        35, 35, 120, 20, hWnd, (HMENU)BTN_MYBUTTON_ID_1, NULL, NULL);

    CreateWindowEx(NULL, L"BUTTON", L"Opaque", WS_VISIBLE | WS_CHILD,
        35, 65, 120, 20, hWnd, (HMENU)BTN_MYBUTTON_ID_2, NULL, NULL);

    // The parameters to ShowWindow:
    // hWnd: the value returned from CreateWindow
    // nCmdShow: the fourth parameter from WinMain
    ShowWindow(hWnd,
        nCmdShow);
    UpdateWindow(hWnd);

    // Main message loop:
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

/***
 *    This function creates the following rectangles:
 *        1.    An outer rectangle using a solid brush with blue background.
 *        2.    An inner rectangle using a hatch brush with red horizontal lines and yellow background.
 *    It makes the background of the inner rectangle transparent or opaque in function of the user's input.
 *    Inputs: 
 *        1.    hdc, the display device context.
 *        2.    transparent, the hatch brush background user's value; true if transparent, false if opaque.
 ***/
VOID SetHatchBrushBackground(HDC hdc, bool transparent)
{
    // Define a brush handle.
    HBRUSH hBrush;

    // Create a solid blue brush.
    hBrush = CreateSolidBrush (RGB(0, 0, 255));

    // Associate the brush with the display device context.
    SelectObject (hdc, hBrush);

    // Draw a rectangle with blue background.
    Rectangle (hdc,  400,40,800,400);


    // Create a hatch brush that draws horizontal red lines.
    hBrush = CreateHatchBrush(HatchStyleHorizontal, RGB(255, 0, 0));

    // Set the background color to yellow.
    SetBkColor(hdc, RGB(255, 255, 0));


    // Select the hatch brush background transparency based on user's input.
    if (transparent == true)
        // Make the hatch brush background transparent.
        // This displays the outer rectangle blue background.
        SetBkMode(hdc, TRANSPARENT);
    else
        // Make the hatch brush background opaque.
        // This displays the inner rectangle yellow background.
        SetBkMode(hdc, OPAQUE);

    // Associate the hatch brush with the current device context.
    SelectObject(hdc, hBrush);

    // Draw a rectangle with the specified hatch brush.
    Rectangle(hdc,  500,130,700,300);

}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  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;
    TCHAR greeting[] = _T("Select your brush background.");
    TCHAR wmId;
    TCHAR wmEvent;


    switch (message)
    {
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);

        // Start application-specific layout section.
        // Just print the geeting string in the top left corner.
        TextOut(hdc,
            5, 5,
            greeting, (int)_tcslen(greeting));
        // End application-specific layout section.

        // Draw rectangles using hatch brush.
        SetHatchBrushBackground(hdc, true);


        EndPaint(hWnd, &ps);
        break;

    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        hdc = GetDC(hWnd);

        switch (wmId) {

            case BTN_MYBUTTON_ID_1:
                // Draw the inner rectangle using a hatch brush transparent background.
                SetHatchBrushBackground(hdc, true);
                MessageBox(hWnd, _T("Hatch brush background is TRANSPARENT"), _T("Information"), MB_OK);
                break;

            case BTN_MYBUTTON_ID_2:
                // Draw the inner rectangle using a hatch brush opaque background.
                SetHatchBrushBackground(hdc, false);
                MessageBox(hWnd, _T("Hatch brush background is OPAQUE"), _T("Information"), MB_OK);
                break;
        }
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;


    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
        break;
    }

    return 0;
}


Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Wingdi.h (include Windows.h)

Library

Gdi32.lib

DLL

Gdi32.dll

See also

Brushes Overview
Brush Functions
CreateDIBPatternBrush
CreateDIBPatternBrushPt
CreatePatternBrush
CreateSolidBrush
DeleteObject
GetBrushOrgEx
SelectObject
SetBkMode
SetBrushOrgEx
COLORREF
RGB

 

 

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