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Simple math operation bug ?

jeromebg

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1

Dienstag, 17. September 2019, 13:09

Simple math operation bug ?

Hi,
Was just trying to increase or decrease a value with add and sub but the results are strange avec 2 operations :
exemple : http://360images.fr/calcstagescale/
xml : http://360images.fr/calcstagescale/pano.xml

Quellcode

 
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<krpano myvar="1">
	
<preview type="grid(cube,64,64,512,0x666666,0x222222,0x222222);" details="16" />

<style name="text_msg" type="text" bg="false" css="text-align:center; color:#ffffff; font-family:Arial; font-size:20px; font-weight:bold;"/>
	
<layer name="settings_menu" type="container" autoalpha="true" bg="true" bgalpha="1" bgcolor="0x000000" bgroundedge="15" align="center" width="300" height="100" keep="true">

		<layer name="minusscale" url="minus.png" onclick="sub(myvar,0.1);copy(layer[stagescalevalue].html,myvar)" align="left" x="20"/>
		<layer name="stagescalevalue" style="text_msg" align="center" html="calc:myvar" enabled="false"/>
		<layer name="plusscale" url="plus.png" onclick="add(myvar,0.1);copy(layer[stagescalevalue].html,myvar)" align="right" x="20"/>

</layer>
	
</krpano>


why is the value having a 0.10000001 change instead of 0.1 ?
Thx !

Tuur

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Dienstag, 17. September 2019, 14:04

Hi,

strange.. seems a bug to me.
i also find it strange that bgroundedge gets egg shape sometimes.

https://www.virtualtuur.com/krpano/120/bugs/stagescale/

Tuur *thumbsup*
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jeromebg

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4

Dienstag, 17. September 2019, 21:14

Good to know ! First time hear about that ???
So with roundval it's working, but still pretty strange...

klaus.krpano

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Mittwoch, 18. September 2019, 09:25

Hi,

that seems strange but is 'normal' for computer math ;-).

The links above are explaining that already very well and also another one:
http://blog.reverberate.org/2016/02/06/f…fied-part2.html

Or just google for '0.1 + 0.2' - that's a very common topic.

When you expect an exact number of decimal points always round to them.

E.g. instead of:

Quellcode

 
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add(myvar,0.1);

try this:

Quellcode

 
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calc(myvar, roundval(myvar + 0.1, 1) );


Best regards,
Klaus

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