'Dynamic' array

Jorgensen

Hi

I'm not sure if this is the right forum for asking ruby questions, so please feel free to move my topic.

I'm trying to create a simple function that collects the areas of the face inside groups and puts a text note that shows the totals.

But I'm having some problems figure out how to store the areas.

I have some groups. Every group consist of one face. The face has a name eg. Office home etc.

I then would like to collect the areas as:
Office 50.000 m2
Home 24.000 m2
Disp. 3.000 m2
Total 77.000 m2

I thought I could use something like AreaTotal[name] = AreaTotal[name] + object.area, and then run through the array and list the name of the key and value, but it seems arrays don't accept variables as keys.

Can anyone please help me to find a solution?

Ps. I know there might be a plugin that does the job, but I find it somehow exciting to create it myself.

Thanks
Jorgensen
Denmark

TIG

You need a hash {} to store the space as the key and the value.
You can then get an array [] of the key-names, sort that in order and then get the hash key value that matches each sorted array element.
The names need to be unrepeated.
To get the total at the end simply add up the values and assign it to a hash key 'Total'...
areas={} groups.each{|group| faces=group.entities.to_a.find_all{|e|e.class==Sketchup::Face} areas[group.name]=faces[0].area }### assuming only ever one face and its area is in sqm already names=[] areas.each_key{|k|names << k} names.sort! tot=0 names.each{|name| tot+=areas[name] puts name+" "+areas[name].to_s } puts puts "Total "+tot.to_s

You can sort hashes etc but I felt you might be happier just remembering everything in a hash and using an array to process it

sdmitch

The API says that face.area returns the area in current units but my experience is that it always returns square inches. So area would need to be divided by inches/meter squared.

TIG

You are right about face.area arriving in sq".
But it's easy enough to convert to sqm and then to fix it at say 3dp using

area_text = sprintf("%.3f", face.area*0.00064516)

I was concentrating on the array[] versus hash{} issue...

sdmitch

Not to step on TIG's toes but to find the groups

groups=Sketchup.active_model.active_entities.find_all{|e| e.class==Sketchup;;Group}

and to total area of multiple faces

 areas[group.name]=0 if !areas[group.name]
 areas[group.name] += faces[0].area

Dan Rathbun

And this:
names=[] areas.each_key{|k|names << k} names.sort!

can be replaced with:
names = areas.keys.sort!

Dan Rathbun

BTW.. the following thread has a code example for getting the volumes of multiple groups.
You can copy it rename the outer and inner modules, to something like: Jorgensen::MultiArea and modify it to return areas instead of volumes.
Volume of Multiple Groups

sdmitch

If you look back at my previous post, the second code snippit has the answer to your problem.

Jorgensen

Hi all

I think I'm a bit lost here.

Could this part somehow be split up? I think that could help me to understand whats going on
groups.each{|group|faces=group.entities.to_a.find_all{|e|e.class==Sketchup::Face} areas[group.name]=faces[0].area

Because I can't figure out where to place this part areas[group.name]=0 if !areas[group.name], and when I add the += I get an error saying Error: #<NoMethodError: undefined method+' for nil:NilClass>`.

Right now my (your) code looks like this:

<span class="syntaxdefault">def tmArea<br /><br />    groups</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_model</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_entities</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">find_all</span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">|</span><span class="syntaxdefault"> e</span><span class="syntaxkeyword">.class==</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Group</span><span class="syntaxkeyword">}<br /><br /></span><span class="syntaxdefault">    areas </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">{}<br /></span><span class="syntaxdefault">    groups</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">each</span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">group</span><span class="syntaxkeyword">|</span><span class="syntaxdefault">faces</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">group</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">entities</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">to_a</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">find_all</span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">|</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">.class==</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">Face</span><span class="syntaxkeyword">}<br /></span><span class="syntaxdefault">    areas</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">group</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">name</span><span class="syntaxkeyword">]</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">+=</span><span class="syntaxdefault"> faces</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">0</span><span class="syntaxkeyword">].</span><span class="syntaxdefault">area    </span><span class="syntaxkeyword">}<br /><br /></span><span class="syntaxdefault">names </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> areas</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">keys</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">sort</span><span class="syntaxkeyword">!<br /><br /></span><span class="syntaxdefault">tot</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">0<br />names</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">each</span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">name</span><span class="syntaxkeyword">|<br /></span><span class="syntaxdefault">tot</span><span class="syntaxkeyword">+=</span><span class="syntaxdefault">areas</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">name</span><span class="syntaxkeyword">]<br /></span><span class="syntaxdefault">puts name</span><span class="syntaxkeyword">+</span><span class="syntaxstring">" "</span><span class="syntaxkeyword">+</span><span class="syntaxdefault">areas</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">name</span><span class="syntaxkeyword">].</span><span class="syntaxdefault">to_s<br /></span><span class="syntaxkeyword">}<br /></span><span class="syntaxdefault">puts<br />puts </span><span class="syntaxstring">"Total "</span><span class="syntaxkeyword">+</span><span class="syntaxdefault">tot</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">to_s<br /><br />end<br /><br /></span><span class="syntaxkeyword">if(</span><span class="syntaxdefault">not file_loaded</span><span class="syntaxkeyword">?(</span><span class="syntaxstring">"TM_Area.rb"</span><span class="syntaxkeyword">))<br /></span><span class="syntaxdefault">  Mejeriet_menu </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> UI</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">menu</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"Plugins"</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">add_submenu</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"TM"</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">add_submenu</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"Arealer"</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  Mejeriet_menu</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">add_item</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"On"</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">{</span><span class="syntaxdefault">  tmArea </span><span class="syntaxkeyword">}<br /></span><span class="syntaxdefault">end<br />file_loaded</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"TM_Area.rb"</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> </span>

Sorry for my noob questions.

Jorgensen

First thanks to your both for the fast reply.

@TIG
the code looks far more professional than my code would look like, I'm not sure if coding in Ruby/SU has change a lot since my last attemt three years ago.

As I understand your code, if two groups has the same name e.g. Office - it won't be saved as a total, but only the area of the last object will be saved.

Do I need something like areas[group.name] += areas[group.name] + faces[0].area to sum the areas?

I have added
model = Sketchup.active_model groups = model.active_entities

Is this still the right way of getting the groups?

Thanks

Jorgensen

Hi sdmitch

How do you fit in 'areas[group.name]=0 if !areas[group.name]
areas[group.name] += faces[0].area' into

groups.each{|group|faces=group.entities.to_a.find_all{|e|e.class==Sketchup::Face}
areas[group.name]=faces[0].area

?

Sorry I'm a noob but I'll try to learn

sdmitch

by simply adding the line above the areas[group.name] += faces[0].area line like this

groups.each{|group|
 faces=group.entities.to_a.find_all{|e|e.class==Sketchup;;Face}
 areas[group.name]=0 if !areas[group.name]
 areas[group.name]+=faces[0].area
}### assuming only one face in group

Jorgensen

Works like a charm now

Thanks !