CreateHatchBrush 函式 (wingdi.h)
CreateHatchBrush 函式會建立具有指定影線圖樣和色彩的邏輯筆刷。
語法
HBRUSH CreateHatchBrush(
[in] int iHatch,
[in] COLORREF color
);
參數
[in] iHatch
筆刷的影線樣式。 此參數可以是下列其中一個值。
| 值 | 意義 |
|---|---|
|
45 度向上由左至右的影線 |
|
水平和垂直交叉切線 |
|
45 度交叉擷取 |
|
45 度向左至右的影線 |
|
水平影線 |
|
垂直影線 |
[in] color
筆刷的前景色彩，用於影線。 若要建立 COLORREF 色彩值，請使用 RGB 宏。
傳回值
如果函式成功，則傳回值會識別邏輯筆刷。
如果函式失敗，則傳回值為 NULL。
備註
筆刷是系統用來繪製填滿圖案內部的點陣圖。
應用程式藉由呼叫 CreateHatchBrush 來建立筆刷之後，就可以藉由呼叫 SelectObject 函式，將該筆刷選取到任何裝置內容中。 它也可以呼叫 SetBkMode ，以影響筆刷的轉譯。
如果應用程式使用影線筆刷填滿父視窗和子視窗的背景，則您必須設定筆刷原點，才能繪製子視窗的背景。 您可以呼叫 SetBrushOrgEx 函式來執行此動作。 您的應用程式可以藉由呼叫 GetBrushOrgEx 函式來擷取目前的筆刷原點。
當您不再需要筆刷時，請呼叫 DeleteObject 函式來刪除它。
Icm： 筆刷建立時未定義色彩。 不過，當筆刷選取為啟用ICM的裝置內容時，就會執行色彩管理。
範例
下列範例會建立邏輯筆刷，此筆刷具有指定的影線圖樣和色彩。 您也可以將影線筆刷背景設定為透明或不透明。
#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;
}
規格需求
| 需求 | 值 |
|---|---|
| 最低支援的用戶端 | Windows 2000 專業版 [僅限傳統型應用程式] |
| 最低支援的伺服器 | Windows 2000 Server [僅限傳統型應用程式] |
| 目標平台 | Windows |
| 標頭 | wingdi.h (包含 Windows.h) |
| 程式庫 | Gdi32.lib |
| Dll | Gdi32.dll |