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Thaddeus L. Olczyk
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 Posted: Thu Oct 14, 2004 4:29 am Post subject: How to draw on a form. |
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There are times when I need to be able to make simple drawings on a
form. I used to do this a lot but can't remember how.
IIRC the basic idea was to put a TPanel on the Form
then put two images. One I display, the other I get
yhe canvas of then draw to. Then I toggle the visible and the drawn,
to give me flickier free drawing. The problem is that this is real
slow. Suggestions?
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Hans Galema
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| Posted: Thu Oct 14, 2004 7:41 am Post subject: Re: How to draw on a form. |
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Thaddeus L. Olczyk wrote:
| Quote: | There are times when I need to be able to make simple drawings on a
form. I used to do this a lot but can't remember how.
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You can draw on a TForm::Canvas directly with TextOut(), LineTo()
and so on.
You can put a TPaintBox on a TForm. Now you can draw in
an area of the TForm.
| Quote: | IIRC the basic idea was to put a TPanel on the Form
then put two images.
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Technically you do not need a TPanel.
| Quote: | One I display, the other I get
yhe canvas of then draw to. Then I toggle the visible and the drawn,
to give me flickier free drawing. The problem is that this is real
slow. Sugg
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One TImage will do. Take a Graphics::TBitMap::Canvas to draw on
and copy the result to the TImage.
You said "simple drawings", well than a TPaintBox would do always.
Just put your code in TPaintBox::OnPaint.
Hans.
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