Solved

Which component should i use to draw on.

Posted on 2007-04-03
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Last Modified: 2010-04-05
Dear Experts,

Again I need your advice.

Thank to you guys I have a good example of a telnet-programm
and it works like a clock. All the features works great.

I have put the example on my site:
http://members.home.nl/peterkiers/
(Beneath the Under Construction bar you see a floppy-disk)

The example draws on the canvas of the form.
But when I want to add a toolbar on the form, a part of the canvas
gets hidden!

1. Shouldn't I better use a component to draw on? And which one should I use?
2. I have tried to use the component TImage to draw on
    but then several features in the example doesn't work that good anymore!
 
I get a little frustrated.

Who can help me?

Greetings,

Peter Kiers





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Question by:peterkiers
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18 Comments
 
LVL 21

Expert Comment

by:ziolko
Comment Utility
you can try this, write your own component based on TCustomPanel and expose Canvas property to public section.

TMyDrawingPanel = class(TCustomPanel)
public
  property Canvas;
end;

ziolko.
0
 
LVL 28

Accepted Solution

by:
ciuly earned 250 total points
Comment Utility
1. it is indeed the best solution. I suggest a TCustomPanel or descendant
2. see 1 :) TImage has to much overhead for what you need.
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Expert Comment

by:ciuly
Comment Utility
hehe, same minute posting :)
0
 
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Assisted Solution

by:ziolko
ziolko earned 250 total points
Comment Utility
btw. you can write your own constructor in TMyDrawingPanel to
set your panel to suit you like BeverOuter := bvNone, caption := '' etc

ziolko.
0
 
LVL 21

Expert Comment

by:ziolko
Comment Utility
yup it was matter of seconds:)

ziolko.
0
 
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Expert Comment

by:ziolko
Comment Utility
peter look at ciuly's points and on mine i'm sure this will help you make right decision which comment you should accept ;)

ziolko.
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Author Comment

by:peterkiers
Comment Utility
Is it maybe possible to help me with it, at least to give a beginning.

Peter Kiers
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Expert Comment

by:ciuly
Comment Utility
> peter look at ciuly's points and on mine i'm sure this will help you make right decision which comment you should accept ;)

rofl

I could still steal them from you, if I toss him some example :P so hurry up ;)
0
 
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Expert Comment

by:ziolko
Comment Utility
that's all you need:
interface
TMyDrawingPanel = class(TCustomPanel)
public
  constructor Create(AOwner: TComponent); override;
  property Canvas;
end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('My Component', [TMyDrawingPanel]);
end;


constructor TMyDrawingPanel.Create(AOwner: TComponent);
begin
  inherited;
  BevelOuter := bvNone;
  Caption := '';
end;

you can write it in separate .pas file and install it as any other component :)
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Author Comment

by:peterkiers
Comment Utility
I choose the advice from Ciuly
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Expert Comment

by:ziolko
Comment Utility
ciuly are you trying to take advantage of fact that my boss is looking over my shoulder? ;)

ziolko.
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Expert Comment

by:ciuly
Comment Utility
>I choose the advice from Ciuly
rolf

just in case that wasn't a joke :) peter, keep in mind that my advice is almost the same as ziolkos and he was first ;) (plus he gave code, which again is an important factor when deciding)
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Expert Comment

by:ziolko
Comment Utility
>>I choose the advice from Ciuly

peter you too against me?:)
i'll show you, both of you, you'll remember me forever:)

ziolko.
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Expert Comment

by:ciuly
Comment Utility
>ciuly are you trying to take advantage of fact that my boss is looking over my shoulder? ;)
become a freelancer and work from home, like I did. only problem is when wife gets home, you can't do "overtime" :D
0
 
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Expert Comment

by:ziolko
Comment Utility
heh i thought abt that... but f*** boss i'm looking for new job anyway :)

ziolko.
0
 
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Author Comment

by:peterkiers
Comment Utility
Thanks both for the advice.

Peter Kiers
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Expert Comment

by:ciuly
Comment Utility
hm... I know from the expert skin there is no way of telling which answer will be accepted (though I thinkit's eitehr the first or teh one with biggest number of points) so I hope it was ziolkos answer you wanted to accept and mine to assist ... because this is the correct way, as I already explained above.

and if indeed you wanted to accept ziolkos answer, then I'll take this opportunity to state again that the new interface ... is way below aspectations (to say the least).
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Expert Comment

by:ziolko
Comment Utility
skin is not that bad, couple o few featuers are cool but cross-topic Qs...
ziolko.
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