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AppGameKit Classic Chat / Hands On AGK BASIC: User-Defined Functions

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Rob from Scotland
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Posted: 13th Sep 2013 16:20
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I have found the Hands on AppGameKit BASIC book very useful but I am a bit puzzled about why I get no result with this program from FIG-8.1, page 194 in the book.

rem *** main program ***
DrawLine()
Sync()
do
loop
end
rem *** Draw a line function ***
function DrawLine()
Print("**********")
endfunction

When I run it, the Application window opens but stays blank.
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Ancient Lady
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Posted: 13th Sep 2013 16:22
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You now need to have the Sync() statement inside the do loop. As well as any print statements. This changed with v108 betas, after the book was written. In v1076, the posted example would work.

Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master
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Rob from Scotland
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Posted: 13th Sep 2013 16:35
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When I put Sync() into the do loop, on the line below do and above loop, it has no effect. Stll nothing printed. When I click help/about I am told that I have build: 107. I had trouble before with v108 beta and had to go back to v1076
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Funnell7
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Posted: 13th Sep 2013 16:43 Edited at: 13th Sep 2013 16:47
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As Ancient Lady pointed out, you also need to move the Print Statement. Try this;



EDIT: @AL,
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Ancient Lady
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Posted: 13th Sep 2013 16:44 Edited at: 13th Sep 2013 16:44
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Given the code you started with, you need to move both the Drawline function call and the Sync call inside the loop.

Anything output from a Print statement only exists for one Sync cycle and then disappears.

EDIT: Ninjaed by Funnell7!

Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master
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Rob from Scotland
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Posted: 13th Sep 2013 16:51
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Thanks a lot. All is now well
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AgentSam
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Posted: 13th Sep 2013 18:18
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Quote: "You now need to have the Sync() statement inside the do loop. As well as any print statements. This changed with v108 betas, after the book was written. In v1076, the posted example would work."


Also, the built-in DrawLine function was introduced in AppGameKit Build 1083.

So, the "DrawLine" function that is defined in the example would override the built-in DrawLine() function.

I'm sure Alistair will one day get around to updating the examples in the PDF-version of the book.

Cheers,
AgentSam
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