如何在DuiLib中绘制用户数据

在DuiLib中有时需要在窗口中绘制图形或图像，如画相关的曲线或OpenCV处理图像的Mat数据，此时DuiLib就没有直接的函数可对界面进行 *** 作，本文描述了一种基于Win窗口的折中方法。

1、定义CWndUI类，使其能够加入到DuiLib中

class CWndUI: public CControlUI

{

public:

CWndUI(): m_hWnd(NULL){}

virtual void SetVisible(bool bVisible = true)

{

__super::SetVisible(bVisible)

::ShowWindow(m_hWnd, bVisible)

}

virtual void SetInternVisible(bool bVisible = true)

{

__super::SetInternVisible(bVisible)

::ShowWindow(m_hWnd, bVisible)

}

virtual void SetPos(RECT rc)

{

__super::SetPos(rc)

::SetWindowPos(m_hWnd, NULL, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, SWP_NOZORDER | SWP_NOACTIVATE)

}

BOOL Attach(HWND hWndNew)

{

if (! ::IsWindow(hWndNew))

{

return FALSE

}

m_hWnd = hWndNew

return TRUE

}

HWND Detach()

{

HWND hWnd = m_hWnd

m_hWnd = NULL

return hWnd

}

HWND GetHWND()

{

return m_hWnd

}

protected:

HWND m_hWnd

}

2、定义并注册窗口和窗口处理函数

ATOM MyRegisterWnd(TCHAR *szClsName, WNDPROC WndProc)

{WNDCLASSEX wcex

wcex.cbSize = sizeof(WNDCLASSEX)

wcex.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS

wcex.lpfnWndProc = WndProc

wcex.cbClsExtra = 0

wcex.cbWndExtra = 0

wcex.hInstance = GetModuleHandle(NULL)

wcex.hIcon = NULL// LoadIcon(hInstance, MAKEINTRESOURCE(IDI_TEST))

wcex.hCursor = NULL//LoadCursor(NULL, IDC_ARROW)

wcex.hbrBackground = GetStockBrush(LTGRAY_BRUSH)//(HBRUSH)(COLOR_WINDOW + 1)

wcex.lpszMenuName = NULL// MAKEINTRESOURCE(IDC_TEST)

wcex.lpszClassName = szClsName

wcex.hIconSm = NULL// LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL))

return RegisterClassEx(&wcex)

}

窗口处理函数为：

LRESULT CALLBACK CallbackImageCalibration(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

// int wmId, wmEvent

PAINTSTRUCT ps

HDC hdcHBRUSH hRedBrush

static int cxClient, cyClient

RECTrect

HBRUSH hbrush

switch (message)

{

case WM_SIZE:

cxClient = LOWORD(lParam)

cyClient = HIWORD(lParam)

::PostMessage(hWnd, WM_PAINT, NULL, NULL)

return 0

case WM_ERASEBKGND:

hdc = GetDC(hWnd)//要十分注意局部变量的使用，假如在这里没有获取dc，那么就会擦除失败。

hbrush = CreateSolidBrush(RGB(0, 0, 0))//新建画刷

GetClientRect(hWnd, &rect)

FillRect(hdc, &rect, hbrush)

ReleaseDC(hWnd, hdc)

return TRUE

case WM_PAINT:

hdc = BeginPaint(hWnd, &ps)

m_fc.DrawriginImage(hWnd)// m_fc为鱼眼图像校正的类

EndPaint(hWnd, &ps)

break

default:

return DefWindowProc(hWnd, message, wParam, lParam)

}

return 0

}

在主程序中注册窗口

TCHAR szClsName[256] = _T("#32775")

MyRegisterWnd(szClsName, CallbackImageCalibration)

3、定义DuiLib界面XML文件中的要素并创建

<HorizontalLayout name="ctnClient1" bkcolor="#FF0E0E0E"><!-- 由于Layout控件都是Container的子类，所以Layout控件可以直接代替Container -->

<Wnd1 name="wndImageCalibration" visible="false"/>

</HorizontalLayout>

创建名称为Wnd1的窗口

CControlUI* CFIPFrameWnd::CreateControl(LPCTSTR pstrClassName)

{

if (_tcsicmp(pstrClassName, _T("Wnd1")) == 0)

{

CWndUI *pUI = new CWndUI

m_hwndImageCalibration = CreateWindow(_T("#32775"), _T("WndImageCalibration"), WS_VISIBLE | WS_CHILD, 0, 0, 0, 0, m_PaintManager.GetPaintWindow(), (HMENU)0, NULL, NULL)

pUI->Attach(m_hwndImageCalibration)

pUI->SetVisible(true)

::ShowWindow(m_hwndImageCalibration, true)

::UpdateWindow(m_hwndImageCalibration)

return pUI

}

Return pUI

}

4、重新绘制窗口

这里展示的是一段鱼眼图像校正的函数。

CControlUI *pbtnWnd = m_PaintManager.FindControl(_T("wndImageCalibration"))

pbtnWnd->SetVisible(true)

//按照DuiLib的模式获取控件的实体类

CListUI* pListUI = static_cast<CListUI*>(m_PaintManager.FindControl(_T("imageCalibrationlist")))

int nSel = pListUI->GetCurSel()//获得左边的

m_fc.fix_data = NULL// m_fc为鱼眼图像校正的类

if (nSel >= 0)

{

string_t filename = m_imageCalibrationList.at(nSel)

Mat mat = imread(filename)

CComboBoxUI* pComboboxUI = static_cast<CComboBoxUI*>(m_PaintManager.FindControl(_T("calibrationMethodlist")))

int nMethod = pComboboxUI->GetCurSel()//获得校正方法，经度、双精度、经纬、柱面等

m_fc.Init(mat.cols, mat.rows, CalibrationType(nMethod))

m_fc.org_mat = mat.clone()

float time = m_fc.Calibration()//开始校正鱼眼图像

CLabelUI *pLabelUI = static_cast<CLabelUI*>(m_PaintManager.FindControl(_T("ImageCalibrationInfo")))

CDuiString strTmp

strTmp.Format(_T("图像校正时间：%f秒"), time)

pLabelUI->SetText(strTmp)

RECT r

::GetWindowRect(m_hwndImageCalibration, &r)

::InvalidateRect(m_hwndImageCalibration,&r,true)//重新绘制

}

其中重绘的函数是在鱼眼校正的类中，m_fc. DrawriginImage函数

void FisheyeCalibration::DrawriginImage(HWND hwnd)

{

if (fix_mat.data)

{

WinShowMatImage(fix_mat, hwnd)

}

}

void FisheyeCalibration::WinShowMatImage(const cv::Mat&img, HWND hwnd)

{

if (!::IsWindow(hwnd)) return

HDC hdc = ::GetWindowDC(hwnd)

RECT rect

GetWindowRect(hwnd, &rect)

RECT destRect

destRect.left = 0destRect.top = 0

destRect.right = rect.right - rect.left

destRect.bottom = rect.bottom - rect.top

//判断长和宽

if ( img.cols<(rect.right - rect.left) && img.rows<(rect.bottom - rect.top))

{

int tmp1 = ((rect.right - rect.left) - img.cols) / 2

int tmp2 = ((rect.bottom - rect.top) - img.rows) / 2

destRect.left = tmp1destRect.right = tmp1 + img.cols

destRect.top = tmp2destRect.bottom = tmp2 + img.rows

}

else

{

if (rect.bottom == rect.top) return

float ratio1 = (float)(rect.right - rect.left) / (float)(rect.bottom - rect.top)

float ratio2 = (float)img.cols / (float)img.rows

if (ratio1 >ratio2)

{

int w = ratio2*(rect.bottom - rect.top)

int h = rect.bottom - rect.top// ratio2*img.rows

destRect.left = (rect.right - rect.left - w) / 2destRect.right = (rect.right - rect.left - w) / 2 + w

destRect.top = 0destRect.bottom = h

}

else

{

int w = rect.right - rect.left// ratio1*img.cols

int h = (rect.right - rect.left) / ratio2// ratio1*img.rows

destRect.left = 0destRect.right = w

destRect.top = (rect.bottom - rect.top - h) / 2destRect.bottom = (rect.bottom - rect.top - h) / 2 + h

}

}

CvMat _img = img

const CvArr* arr = &_img

CvMat stub

CvMat* image = cvGetMat(arr, &stub)

// 构造BITMAPINFO头

SIZE size = { image->width, image->height }

int channels = 3

BITMAPINFO binfo

memset(&binfo, 0, sizeof(binfo))

BITMAPINFOHEADER&bmih = binfo.bmiHeader

bmih.biSize = sizeof(BITMAPINFOHEADER)

bmih.biWidth = size.cx

bmih.biHeight = abs(size.cy)

bmih.biPlanes = 1

bmih.biBitCount = (unsigned short)(channels * 8)

bmih.biCompression = BI_RGB

void* dst_ptr = 0

HBITMAP hb = CreateDIBSection(hdc, &binfo, DIB_RGB_COLORS, &dst_ptr, 0, 0)

HDC windowdc = ::CreateCompatibleDC(hdc)

SelectObject(windowdc, hb)

CvMat dst

cvInitMatHeader(&dst, size.cy, size.cx, CV_8UC3, dst_ptr, (size.cx*channels + 3)&-4)

int origin = ((IplImage*)arr)->origin

cvConvertImage(image, &dst, 1/*origin == 0 ? CV_CVTIMG_FLIP : 0*/)

// 显示

SetStretchBltMode(hdc, COLORONCOLOR)

StretchBlt(hdc, destRect.left+1, destRect.top+1, destRect.right - destRect.left, destRect.bottom - destRect.top, windowdc, 0, 0, size.cx, size.cy, SRCCOPY)

}

VB使用AddItem 方法给ComboBox控件添加数据。

AddItem 方法，用于将项目添加到 ListBox 或 ComboBox 控件。不支持命名参数。

Private Sub Form_Click()

    Dim Entry, I, Msg   ' 声明变量。

    Msg = "点OK增加100项到ComboBox控件"

    MsgBox Msg   ' 显示信息。

    For I = 1 To 100   ' 计数值从 1 到 100。

         Entry = "Entry " & I   ' 创建输入项。

         Combo1.AddItem Entry   ' 添加该输入项。

    Next I

End Sub

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