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Date Posted: 06:11:24 09/07/01 Fri
Author: Michel
Subject: Re: Draw a TShape on ImageScrollBox
In reply to: Tomas 's message, "Re: Draw a TShape on ImageScrollBox" on 04:53:43 09/07/01 Fri


Hi Tomas,

This is not trivial. You need to first look at the orginal pixel, to determine the color of the new pixel, (one pixel by pixel for the entire shape). You can combine the RGB values of the original pixel with your highlighting color.

Best regards,

Michel


>Well, I'm able to draw solid color shapes on my black
>and white tiff images. What I really need to do is
>draw *translucent* shapes on top of my image (kinda
>like a highlighter pen that shows the text
>underneath), any pointers in this direction?
>BTW, thanks for the D6 package...
>
>TIA
> Tomas-
>>
>>Hi Darrell,
>>
>>The try to draw on a TImageScollBox is to create a
>>TCanvas related to the scroll box:
>>
>>Canvas := TCanvas.Create;
>>Canvas.Handle := GetDC(ImageScrollBox.Handle);
>>
>>You can use the methods TCanvas to draw.
>>
>>Then when you are done,
>>
>>ReleaseDC(ImageScrollBox.Handle, Canvas.Handle);
>>Canvas.Free;
>>
>>Best regards,
>>
>>Michel
>>
>>>How can I draw a TShape on a ScrollBoxImage?
>>>
>>>TIA
>>>
>>>Darrell

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