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Date Posted: 07:11:31 05/16/00 Tue
Author: Michel
Subject: Re: How can I save a paintbox into a bitmap file
In reply to: Carlos Ramírez 's message, "How can I save a paintbox into a bitmap file" on 00:28:40 05/15/00 Mon


Hi Carlos,

The easiest way to transfer images from one type of component or class to another is usually to search for a Canvas property in both objects. For example, to transfer the contents for a paint box to a TJpegGraphic,

JpegGraphic := TJPegGraphic.Create;
JpegGraphic.NewImage(
PaintBox.Canvas.Width,
PaintBox.Canvas.Height,
ifTrueColor, nil, 0, 0 );
JpegGraphic.Canvas.Draw(0, 0, PaintBox.Canvas );
JpegGraphic.SaveToFile(...);
JpegGraphci.Free;

For the minimize and scroll box problems I am not sure what is wrong. Also, I think you made the right decision to draw an a TPaintBox rather that a TImage as the refreshes will be faster.

Best regards,

Michel


> I´m developing an image editor in Delphi 5 and I don´t
> know how to save the paintbox's content into a bitmap
> or jpeg file.
>
> Another problems:
> When I minimize the form, the paintbox's image
> disapperars. How can I avoid this?
> When I draw a bitmap or jpeg image on the paintbox
> that is larger than the paintbox's area, the
> scrollbars don´t appear although the paintbox is on a
> scrollbox. How can I do a scrollable paintbox?
>
> The above problems don't happen if I use a Timage
> component, but when I draw on it, the image blinks.
> Why? How can I avoid that?
>
> I`ll be very greateful if somebody can help me.
>
> Carlos Ramírez E-mail: zenius@yupimail.com

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