Fungsi CreateHatchBrush (wingdi.h)
Fungsi CreateHatchBrush membuat kuas logis yang memiliki pola dan warna tetas yang ditentukan.
Sintaks
HBRUSH CreateHatchBrush(
[in] int iHatch,
[in] COLORREF color
);
Parameter
[in] iHatch
Gaya menetas kuas. Parameter ini bisa menjadi salah satu nilai berikut.
[in] color
Warna latar depan kuas yang digunakan untuk menetas. Untuk membuat nilai warna COLORREF , gunakan makro RGB .
Nilai kembali
Jika fungsi berhasil, nilai pengembalian mengidentifikasi kuas logis.
Jika fungsi gagal, nilai yang dikembalikan adalah NULL.
Keterangan
Kuas adalah bitmap yang digunakan sistem untuk melukis interior bentuk yang diisi.
Setelah aplikasi membuat kuas dengan memanggil CreateHatchBrush, aplikasi dapat memilih kuas tersebut ke dalam konteks perangkat apa pun dengan memanggil fungsi SelectObject . Ini juga dapat memanggil SetBkMode untuk memengaruhi penyajian kuas.
Jika aplikasi menggunakan kuas menetas untuk mengisi latar belakang jendela induk dan anak dengan warna yang cocok, Anda harus mengatur asal sikat sebelum melukis latar belakang jendela anak. Anda dapat melakukan ini dengan memanggil fungsi SetBrushOrgEx . Aplikasi Anda dapat mengambil asal kuas saat ini dengan memanggil fungsi GetBrushOrgEx .
Ketika Anda tidak lagi memerlukan kuas, panggil fungsi DeleteObject untuk menghapusnya.
ICM: Tidak ada warna yang didefinisikan pada pembuatan kuas. Namun, manajemen warna dilakukan ketika kuas dipilih ke dalam konteks perangkat berkemampuan ICM.
Contoh
Contoh berikut membuat kuas logis yang memiliki pola dan warna hatch yang ditentukan. Anda juga dapat mengatur latar belakang sikat menetas ke transparan atau buram.
#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 greeting 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;
}
Persyaratan
| Persyaratan | Nilai |
|---|---|
| Klien minimum yang didukung | Windows 2000 Professional [hanya aplikasi desktop] |
| Server minimum yang didukung | Windows 2000 Server [hanya aplikasi desktop] |
| Target Platform | Windows |
| Header | wingdi.h (sertakan Windows.h) |
| Pustaka | Gdi32.lib |
| DLL | Gdi32.dll |