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Date Posted: 06:07:36 06/11/02 Tue
Author: Michel
Subject: Re: Clear Graphic Image
In reply to: Chuck Latham 's message, "Re: Clear Graphic Image" on 11:38:24 06/10/02 Mon


Hi Chuck,

I think I finally understand here. You should not call Graphic->Clear() not DisplayedGraphic->Clear(), but just ImageScrollBox->Clear(). This will take care of doing both with the redraw.

Best regards,

Michel


>Thanks for your help. Moving Visible before the Clear
>seems to make it work. In debugging the code, the
>Graphic Image would be cleared and updated to the new
>image but the DisplayedGraphic stayed the same. I did
>DisplayedGraphic_>Clear(), which cleared the displayed
>image but it did not update to reflect the new image.
>
>
> fileTimer->Enabled = false;
> AnsiString filepath =
>ExtractFilePath(Application->ExeName);
> if (FileExists(filepath + "Front.tif"))
> {
> ISBFront->Visible = true;
> ISBFront->Clear();
> ISBFront->DisplayedGraphic->Clear();
> ISBFront->FileName = filepath + "Front.tif";
> CheckImageAvailable = true;
> DeleteFile(filepath + "Front.tif");
> }
> else
> {
> ISBFront->Visible = false;
> FileCheckRetry++;
> if (FileCheckRetry < 20)
> fileTimer->Enabled = true;
> }
> if (FileExists(filepath + "Back.tif"))
> {
> ISBBack->Visible = true;
> ISBBack->Clear();
> ISBBack->DisplayedGraphic->Clear();
> ISBBack->FileName = filepath + "Back.tif";
> DeleteFile(filepath + "Back.tif");
> }
> else
> {
> ISBBack->Visible = false;
> }
>>
>>Hi Chuck,
>>
>>Clear should work. I have checked the implementation
>>and it will also call Redraw(True). One possible cause
>>is that the Visible = False, where the call to Clear
>>will be ignored.
>>
>>Try tracing with the debugger into the Clear call to
>>see if this is the case.
>>
>>Best regards,
>>
>>Michel
>>
>>>I am trying to implement a program using Borland
>>>C++Builder 6 and 2 Envision Image Library controls
>>>(Version 2, beta 1) to display tiff files. I execute
>>>the following code when I get new images to display.
>>>The first set of images display with no problem but
>I
>>>am unable to clear the images to display the
>>>subsequent images. Can you please tell me what I am
>>>doing wrong…
>>>
>>>I've tried Clear().
>>>I've disabled and enabled the control.
>>>I've loaded the information into a new
>TImageScrollBox
>>>and assigned its graphic to the control.
>>>I have set graphic and DisplayedGraphic to NULL.
>>>
>>>Nothing I have done will allow me to change the
>>>original image. After I have done the load from
>file,
>>>I still have the original image displayed.
>>>
>>>Best regards,
>>>
>>>Chuck Latham
>>>clatham@revealsystems.com
>>>
>>> AnsiString filepath =
>>>ExtractFilePath(Application->ExeName);
>>> if (FileExists(filepath + "Front.tif"))
>>> {
>>> ISBFront->Graphic->Clear();
>>> ISBFront->Redraw(true);
>>> AnsiString fn = filepath + "Front.tif";
>>> ISBFront->LoadFromFile(fn, 0);
>>> ISBFront->Redraw(true);
>>> DeleteFile(filepath + "Front.tif");
>>> CheckImageAvailable = true;
>>> ISBFront->Visible = true;
>>> }
>>> else
>>> {
>>> ISBFront->Visible = false;
>>> FileCheckRetry++;
>>> if (FileCheckRetry < 20)
>>> fileTimer->Enabled = true;
>>> }
>>> if (FileExists(filepath + "Back.tif"))
>>> {
>>> ISBBack->Graphic->Clear();
>>> ISBFront->Redraw(true);
>>> AnsiString fn = filepath + "Back.tif";
>>> ISBBack->LoadFromFile(fn, 0);
>>> ISBBack->Redraw(true);
>>> ISBBack->Visible = true;
>>> DeleteFile(filepath + "Back.tif");
>>> }
>>> else
>>> {
>>> ISBBack->Visible = false;
>>> }

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