librelist archives

Help with coding

From:

DeAndrea Monroe

Date:

2010-03-24 @ 16:28

Hi, I am having problems with some code I have written. Everytime I run it,
I get a blank box. Here is the code:

Shoes.app(:title => "Coplanar Points", :width => 550, :height
=> 400) do

   @beex = (@betax.text.to_f-@alphax.text.to_f)
   @beey = (@betay.text.to_f-@alphay.text.to_f)
   @beez = (@betaz.text.to_f-@alphaz.text.to_f)
   @ceex = (@gammax.text.to_f-@alphax.text.to_f)
   @ceey = (@gammay.text.to_f-@alphay.text.to_f)
   @ceez = (@gammaz.text.to_f-@alphaz.text.to_f)
   @deex = (@deltax.text.to_f-@alphax.text.to_f)
   @deey = (@deltax.text.to_f-@alphay.text.to_f)
   @deez = (@deltax.text.to_f-@alphaz.text.to_f)

   def calculate
      ((@beex.text.to_f*((@ceey.text.to_f*@deez.text.to_f)-
(@ceez.text.to_f*@deey.text.to_f)))-(@beey.text.to_f*
((@ceex.text.to_f*@deez.text.to_f)-
(@ceez.text.to_f*@deex.text.to_f)))+(@beez.text.to_f*
((@ceex.text.to_f*@Dy.text.to_f))-
(@ceey.text.to_f*@deex.text.to_f)))
   end
   stack(:width => '100%', :margin => 20) do
      para('Calculate Coplanar Points')
      para('                           x
y                       z')
   end

      flow(:width => '100%' ) do
         para('Point A: ')
      @alphax = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      @alphay = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      @alphaz = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      end
      flow(:width => '100%' ) do
         para('Point B: ')
      @betax = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      @betay = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      @betaz = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      end
      flow(:width => '100%' ) do
         para('Point C: ')
      @gammax = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      @gammay = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      @gammaz = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      end
      flow(:width => '100%' ) do
         para('Point D: ')
      @deltax = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      @deltay = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}
      @deltaz = edit_line(:width => 100, height => 35)
{@coplanar.text <%7B@coplanar.text> = calculate}

      @button = button "Configure" do
         c = calculate==0
            case c
            when true
            alert("Points are coplanar, equation is")
            when false
            alert("Points are NOT coplanar")

         end
      end
   end
end

Can someone help me try to figure out what's wrong?

Hey DeAndrea-

It seems like i5m has given you some good advice, I just wanted to point you
to either pastebin.org or http://gist.github.com/ . Both are really good
tools for sharing code snippets; email tends to screw up the formatting and
make it really hard to read.

Not that you have to use them... just wanted to let you know such a thing
exists!

-Steve

And, also http://pastie.org/... Gist and Pastie are my faves.

On Wed, Mar 24, 2010 at 10:42 AM, Steve Klabnik <steve@steveklabnik.com>wrote:

> Hey DeAndrea-
>
> It seems like i5m has given you some good advice, I just wanted to point
> you to either pastebin.org or http://gist.github.com/ . Both are really
> good tools for sharing code snippets; email tends to screw up the formatting
> and make it really hard to read.
>
> Not that you have to use them... just wanted to let you know such a thing
> exists!
>
> -Steve
>



-- 
   ~devyn

Hi DeAndrea,

edit_line with block is cool. I like it. :)

Look at a tiny sample snippet:
http://shoes-tutorial-note.heroku.com/html/00536_edit_line_with_block.html

Hope this helps,
ashbb

ps. I confirmed i5m's revised code (http://gist.github.com/339896).
    It works very well. Great!
    If you add `@coplanar = para` into i5m's code.
    You can get the result of calculation every time one of the values gets
changed. ;-)

I appreciate all of the help from you guys. I am kind of new to Shoes but
it's something I am getting to understand in a class I am taking. I have
another question though. If I want to just the numerical value of the method
calculate, how would I go about doing that and putting the number into the
form of an equation?

On Wed, Mar 24, 2010 at 6:15 PM, Satoshi Asakawa <ashbbb@gmail.com> wrote:

> Hi DeAndrea,
>
> edit_line with block is cool. I like it. :)
>
> Look at a tiny sample snippet:
> http://shoes-tutorial-note.heroku.com/html/00536_edit_line_with_block.html
>
> Hope this helps,
> ashbb
>
> ps. I confirmed i5m's revised code (http://gist.github.com/339896).
>     It works very well. Great!
>     If you add `@coplanar = para` into i5m's code.
>     You can get the result of calculation every time one of the values gets
> changed. ;-)
>
>

DeAndrea,

not sure I understand you, do you mean something like this?

    x = calculate
    y = 2*x + 5

If so, this is what you are already doing with your

@coplanar.text = calculate

I'm guessing what you might want to do is redefine the calculate method so
you can pass arguments to it:

    def calculate(alphax, alphay, alphaz, betax, ... and so on)
        beex = (betax-alphax)
        ....
    end

Although probably easier to use arrays as arguments:

    def calculate(alpha, beta, gamma, delta)
        beex = (beta[0]-alpha[0])
        ...
    end

alpha, beta, etc are arrays containing three values, x, y and z. So you
could use the method like this

    alpha = [@alphax.text.to_f, @alphay.text.to_f, @alphaz.text.to_f]
    ...
    x = calculate(alpha, beta, gamma, delta)
    y = 2*x+5


-----------------------
i5m.co.uk
GPG Key: 0xA18A602B


On Wed, Mar 24, 2010 at 10:49 PM, DeAndrea Monroe <dmonroe4919@gmail.com>wrote:

> I appreciate all of the help from you guys. I am kind of new to Shoes but
> it's something I am getting to understand in a class I am taking. I have
> another question though. If I want to just the numerical value of the method
> calculate, how would I go about doing that and putting the number into the
> form of an equation?
>
>
>
>

I'm trying to just get the value of what def calculate produces. I know that
after it does all of its calculations, it gives out one number. I would like
to just get that number and use it in the following sentence: The equation
is : "the number from def calculate".

Ok,

in this application you probably want to do:

    def calculate
         .... all your calculations
         ....
         @result = ((@beex*((@ceey*@deez)-.... etc
     end

Then you can use this in an alert or para:

     para "The equation is #{@result}"


-----------------------
i5m.co.uk
GPG Key: 0xA18A602B


On Thu, Mar 25, 2010 at 2:58 PM, DeAndrea Monroe <dmonroe4919@gmail.com>wrote:

> I'm trying to just get the value of what def calculate produces. I know
> that after it does all of its calculations, it gives out one number. I would
> like to just get that number and use it in the following sentence: The
> equation is : "the number from def calculate".
>

Thank you again, that worked perfectly!

How do you find the square root of a number using shoes?

In Ruby, so in Shoes as well, like follows: Math.sqrt(2)

On 6 Apr 2010, at 21:46, DeAndrea Monroe <dmonroe4919@gmail.com> wrote:

> How do you find the square root of a number using shoes?

I'm sorry, I meant the absolute value?

On Tue, Apr 6, 2010 at 4:54 PM, i5m <i5ivem@googlemail.com> wrote:

> In Ruby, so in Shoes as well, like follows: Math.sqrt(2)
>
> On 6 Apr 2010, at 21:46, DeAndrea Monroe <dmonroe4919@gmail.com> wrote:
>
> > How do you find the square root of a number using shoes?
>

Just use #abs.

> -200.abs
=> 200

On Tue, Apr 6, 2010 at 4:55 PM, DeAndrea Monroe <dmonroe4919@gmail.com>wrote:

> I'm sorry, I meant the absolute value?
>
>
> On Tue, Apr 6, 2010 at 4:54 PM, i5m <i5ivem@googlemail.com> wrote:
>
>> In Ruby, so in Shoes as well, like follows: Math.sqrt(2)
>>
>> On 6 Apr 2010, at 21:46, DeAndrea Monroe <dmonroe4919@gmail.com> wrote:
>>
>> > How do you find the square root of a number using shoes?
>>
>
>

Shoes apps are just Ruby. Math.sqroot() away.

On Tue, Apr 6, 2010 at 4:46 PM, DeAndrea Monroe <dmonroe4919@gmail.com>wrote:

> How do you find the square root of a number using shoes?
>

Also, forgot to mention, looks like there is a typo in the calculate method:

    ((@ceex.text.to_f*@Dy.text.to_f))-

I've assumed @Dy is meant to be @deey

-----------------------
i5m.co.uk
GPG Key: 0xA18A602B


On Wed, Mar 24, 2010 at 4:28 PM, DeAndrea Monroe <dmonroe4919@gmail.com>wrote:

> Hi, I am having problems with some code I have written. Everytime I run it,
> I get a blank box. Here is the code:
>
>

Hi,

you get the blank box because you have the list of

    @beex = (@betax.text.to_f ...

defined at the start of the Shoes app, but at this point you haven't created
any of the edit_lines to get the "text" from. If you move those lines inside
the def calculate method it solves that problem.

Did you know you could press "ALT + /" to open up a Shoes console window? If
you do that you'd see the error "undefined method 'text' for nil:NilClass"
and it even gives you the line number the error occurs on.

The next one that occurs is with the calculate method. For instance, you
have

    @beex.text.to_f* ...

The ".text.to_f" is not required as you've already done this in calculating
@beex. @beex is just a number.

See here: http://gist.github.com/339896

-----------------------
i5m.co.uk
GPG Key: 0xA18A602B


On Wed, Mar 24, 2010 at 4:28 PM, DeAndrea Monroe <dmonroe4919@gmail.com>wrote:

> Hi, I am having problems with some code I have written. Everytime I run it,
> I get a blank box. Here is the code:
>
>