MFC Picture Control W/ Bitmap Mayhem.

[l46kok]

Ok.. My problem is kind of screwed up, I'm not even sure if there is a solution available for this. If there isn't, I'd like to know any alternative way of doing this.

I placed a Picture Control using resource compiler and using that, I was able to load a BMP or JPEG file on it. Here is the problem - I'd like to draw rectangles ON TOP of the picture that has been loaded. Let me show you my OnPaint function to see what I have attempted so far.

void CMy2d_3d_applicationDlg::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	
	CRect RectColorChanger;

	// Get the location and dimensions of the control
	m_picCtrl.GetWindowRect(&RectColorChanger);
	CBrush BrushRed(RGB(255, 55, 5));

	// Select the new brush
	CBrush *pOldBrush = dc.SelectObject(&BrushRed);

	// Convert the current coordinates from Screen to Client
	ScreenToClient(&RectColorChanger);
	// Change the background of the control
	dc.Rectangle(RectColorChanger);
	
	// Restore the old brush
	dc.SelectObject(pOldBrush);

	if (IsIconic())
	{
		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

This code is supposed to paint the whole background of the picture control with color red and it works - only if the type of the picture control is set to frame. Well, if I set the type to frame, then I can't load the JPEG or BMP files onto the picture control anymore. On the other hand, if I change the type of picture control into bitmap, then the picture loads properly - only that I will not be able to use device context to create any rectangles or circles.

Does anyone have bright ideas to overcome this problem?

[VladimirF]

Does anyone have bright ideas to overcome this problem?

Sure. Many ideas, all of them are bright
1. You should only paint your window in *its own* OnPaint(), NOT its parent!
2. Your picture control is a separate window. It might share its parent DC or have its own. You should not assume that it will share DC. Generally child windows are clipped from the parent DC so painting under them makes no sense, and has no effect.
3. If you want to draw ON TOP of the picture, you should let the control do its thing first (in WM_PAINT handler), then draw whatever; not the other way around.

[l46kok]

Ok, so if I understood you correctly, you want me to generate a class for the picture control, map it with OnPaint function and draw the rectangles there?

[VladimirF]

Ok, so if I understood you correctly, you want me to generate a class for the picture control, map it with OnPaint function and draw the rectangles there?

Yes, please.

[l46kok]

Strange.. It didn't work either in Frame type or Bitmap type. Here's what I have for the Picture Control Class

// PictureCtrl.cpp : implementation file
//

#include "stdafx.h"
#include "2d_3d_application.h"
#include "PictureCtrl.h"


// PictureCtrl dialog

IMPLEMENT_DYNAMIC(PictureCtrl, CDialog)

PictureCtrl::PictureCtrl(CWnd* pParent /*=NULL*/)
	: CDialog(PictureCtrl::IDD, pParent)
{

}

PictureCtrl::~PictureCtrl()
{
}

void PictureCtrl::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}


BEGIN_MESSAGE_MAP(PictureCtrl, CDialog)
	ON_WM_PAINT()
END_MESSAGE_MAP()

void PictureCtrl::OnPaint()
{
	CPaintDC dc(this);

	CRect RectColorChanger;

	// Get the location and dimensions of the control
	this->GetWindowRect(&RectColorChanger);
	CBrush BrushRed(RGB(255, 55, 5));

	// Select the new brush
	CBrush *pOldBrush = dc.SelectObject(&BrushRed);

	// Convert the current coordinates from Screen to Client
	ScreenToClient(&RectColorChanger);
	// Change the background of the control
	dc.Rectangle(RectColorChanger);
	
	// Restore the old brush
	dc.SelectObject(pOldBrush);

}