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Topic: Antialiased line problem (Read 328 times) |
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Joe68
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Posts: 19
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Antialiased line problem
« Thread started on: Feb 21st, 2015, 4:21pm » |
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I wrote a simple program to display an analogue clock.
I am trying to improve it using antialiased lines from GDIPLIB (e.g. for the hands) but I can't get this to work.
As far as I can see, my code is in accordance with that shown in the BB4W Help, but I keep receiving 'Syntax error' each time the program reaches
FN_gdipcreatepen(PenColour%,PenStyle%,PenWidth%)
Can anyone please show me where I am going wrong?
Here is a sample of a test program I used to try to discover my error:
MODE 8
INSTALL @lib$+"GDIPLIB"
PROC_gdipinit
PenColour%=&FFFFFFFF
PenStyle%=&12
PenWidth%=5
PRINT PenColour%
FN_gdipcreatepen(PenColour%,PenStyle%,PenWidth%)
PROC_gdipline(pen%,100,100,500,200)
END
Thanks in advance for the help.
Joe.
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Joe
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VBI
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Re: Antialiased line problem
« Reply #1 on: Feb 21st, 2015, 6:48pm » |
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As specified in the related help documentation, FN_gdipcreatepen has a return value for your newly created pen, so you need to supply a variable to store it in the usual way. This value is then required as Pen% by PROC_gdipline, so that it knows which pen it is being asked to draw with.
Your example, modified -
Code:
INSTALL @lib$+"GDIPLIB"
PROC_gdipinit
MODE 8
PenColour%=&FFFFFFFF
PenStyle%=&12
PenWidth%=5
PRINT PenColour%
pen%=FN_gdipcreatepen(PenColour%,PenStyle%,PenWidth%)
PRINT pen%
PROC_gdipline(pen%,100,100,500,200)
PROC_gdipexit
END
Hope that helps.
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| « Last Edit: Feb 21st, 2015, 6:53pm by VBI » |
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Joe68
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Posts: 19
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Re: Antialiased line problem
« Reply #2 on: Feb 21st, 2015, 8:54pm » |
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Thank you very much, your mod works perfectly.
I didn't find this specifically stated in the Help, and being rather new to programming I didn't realise where the 'pen' variable in the line drawing command was coming from!
Always nice to be shown a new trick! 
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Joe
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