Smalltalk › Pharo › Pharo Smalltalk Users

inaccuracy in drawing?

_‹ Previous Topic Next Topic _›

Classic

List

Threaded

6 messages Options

HilaireFernandes

inaccuracy in drawing?

Hello,

I have noted inaccuracy when drawing circle (seen screenshot with circle
and tangent line intersecting circle in two points and not one). I
looked at my code with possible rounding error related to a mix of float
and integer, I pay attention to convert to float when needed, but I
can't fix the situation.
Can it be related to Athens ? Is it ok to feed Athens with float numbers ?

Thanks

Hilaire

--
Dr. Geo - http://drgeo.eu
iStoa - http://istoa.drgeo.eu

tangente.png (6K) Download Attachment

http://drgeo.eu

stepharo

Re: inaccuracy in drawing?

Igor is sick at home. Not sure that he is reading mails.

On 8/10/14 15:06, Hilaire wrote:

> Hello,
>
> I have noted inaccuracy when drawing circle (seen screenshot with circle
> and tangent line intersecting circle in two points and not one). I
> looked at my code with possible rounding error related to a mix of float
> and integer, I pay attention to convert to float when needed, but I
> can't fix the situation.
> Can it be related to Athens ? Is it ok to feed Athens with float numbers ?
>
> Thanks
>
> Hilaire
>
>
>

HilaireFernandes

Re: inaccuracy in drawing?

In reply to this post by HilaireFernandes

Faulty point seems to be Rectangle>>center.
May be some other ones to find.
But not sure what to do with it, should it lands on float and not integer?

Hilaire

Le 08/10/2014 15:06, Hilaire a écrit :

--
Dr. Geo - http://drgeo.eu
iStoa - http://istoa.drgeo.eu

http://drgeo.eu

abergel

Re: inaccuracy in drawing?

Humm… Good question

It cannot be a point fraction? But maybe things may break because of this.

Alexandre

--
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

On Oct 8, 2014, at 12:26 PM, Hilaire <[hidden email]> wrote:

Faulty point seems to be Rectangle>>center.
May be some other ones to find.
But not sure what to do with it, should it lands on float and not integer?

Hilaire

Le 08/10/2014 15:06, Hilaire a écrit :
Hello,

I have noted inaccuracy when drawing circle (seen screenshot with circle
and tangent line intersecting circle in two points and not one). I
looked at my code with possible rounding error related to a mix of float
and integer, I pay attention to convert to float when needed, but I
can't fix the situation.
Can it be related to Athens ? Is it ok to feed Athens with float numbers ?

Thanks

Hilaire

--
Dr. Geo - http://drgeo.eu
iStoa - http://istoa.drgeo.eu

HilaireFernandes

Re: inaccuracy in drawing?

Le 08/10/2014 20:08, Alexandre Bergel a écrit :
> Humm… Good question
> It cannot be a point fraction? But maybe things may break because of this.
>

I guess so, but in my situation Rectangle attributes are already Float,
so it does not change.

Anyway it improves the accuracy in my case to redefine this center
method in my Morph context.

And it looks like Athens works with Float.

Hilarie

--
Dr. Geo - http://drgeo.eu
iStoa - http://istoa.drgeo.eu

http://drgeo.eu

abergel

Re: inaccuracy in drawing?

Yes, Athens works with Floats. But not with Fractions I think

Alexandre

--
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

On Oct 8, 2014, at 4:43 PM, Hilaire <[hidden email]> wrote:

Le 08/10/2014 20:08, Alexandre Bergel a écrit :
Humm… Good question
It cannot be a point fraction? But maybe things may break because of this.

I guess so, but in my situation Rectangle attributes are already Float,
so it does not change.

Anyway it improves the accuracy in my case to redefine this center
method in my Morph context.

And it looks like Athens works with Float.

Hilarie

--
Dr. Geo - http://drgeo.eu
iStoa - http://istoa.drgeo.eu