@tig said:

You could pick your points in 3d, so the possibilities could get muddied.

It's flat, so that's one obstacle out of the way.

@tig said:

You need to collect each newly made edge into another array called @edges

Ok, so instead of connecting points using lines, should I do something like:

 
edge = Sketchup.active_model.entities.add_line(@pts[@n-1], @pts[@n])
line = edge.line

Sorry to say, but I lost you after that

Hi all, I'm really enjoying this forum. Thanks to all contributors.
Ok, so I created a line tool that saves the coordinates of each point clicked. Find the code below:

class PVSketch   
	def activate
		@model = Sketchup.active_model  
		@ents = @model.active_entities
		@view = @model.active_view
		result = Sketchup.send_action "viewTop;"	
		@ip = Sketchup;;InputPoint.new
		@pts = []
		@n = 0
    end

	def onLButtonUp(flags,x,y,view)
		@ip.pick(view,x,y)
		if not @pts[0]
			@pts << @ip.position
		else
			@pts << @ip.position
			line = @ents.add_line @pts[@n-1], @pts[@n]
		end
		if @pts[0] && @ip.position==@pts[0] && @n != 0
			tools = Sketchup.active_model.tools
			tool = tools.pop_tool
		end
		@n = @n + 1
	end
end

click2_cmd = UI;;Command.new("PV Sketch") {
	Sketchup.active_model.select_tool PVSketch.new
}

tool_menu = UI.menu "Tools"
tool_submenu = tool_menu.add_submenu "DrawLine"
tool_submenu.add_separator
tool_submenu.add_item click2_cmd

It works perfectly, the next step is that I want to automatically fill the shape that the user drew with the maximum amount of rectangles, let's say 24cmx48cm. Can someone help me with that?

Thank you so much, Dan. Your tips solved the problem.
Now, I have the program running, but I don't get the correct coordinates.
I was expecting to get some positive and some negative, according to where I am from the axes.
I clicked the 4 corners of the screen and I got the following, which doesn't look right:

@unknownuser said:

x: 46 y: 48 z: 48
x: 53 y: 52 z: 46
x: 54 y: 57 z: 46
x: 52 y: 46 z: 56

Thanks, TIG. I think I mixed up with the logic of Sketchup.
(1) Does count=faces.length count all faces on the screen OR in the array I made?
(2) If a user deletes a face manually, will it be removed from the array? OR only from the screen?
(3) If the answer to (2) is "only from the screen" does this mean that if I re-draw the array, will the shape that the user deleted get re-drawn?
Thanks, again.

Thank you so much, Dan. Your tips solved the problem.
Now, I have the program running, but I don't get the correct coordinates.
I was expecting to get some positive and some negative, according to where I am from the axes.
I clicked the 4 corners of the screen and I got the following, which doesn't look right:

@unknownuser said:

x: 46 y: 48 z: 48
x: 53 y: 52 z: 46
x: 54 y: 57 z: 46
x: 52 y: 46 z: 56

After I got your comments I worked on my program, I wrote the following code:

class MyTool
	
		# Initialization
	def activate
		@input = Sketchup;;InputPoint.new
		@pts[]
	end

	# Respond to left click
	def onLButtonDown flags, x, y, view
		@input.pick view, x, y
		sketchup;;set_status_text "Left click ", SB_VCB_LABEL
		pos = @input.position
		@pts << pos
		str = "%.2f, %.2f,%.2f" % [pos.x, pos.y, pos.z]
		Sketchup;;set_status_text str, SB_VCB_VALUE
	end
	
end

# Create Command object
simple_cmd = UI;;Command.new("Click") {
	Sketchup.active_model.select_tool MyTool.new
}
	
#Add command to tools menu
tool_menu = UI.menu "Tools"
tool_menu.add_separator
tool_menu.add_item simple_cmd	

But still something is not right! I'm getting the following error:

@unknownuser said:

Error: #<NoMethodError: undefined method <<' for nil:NilClass> C:/Program Files/Google/Google SketchUp 8/Plugins/click.rb:14:in onLButtonDown'
C:/Program Files/Google/Google SketchUp 8/Plugins/click.rb:14

Can you please help me out? Thanks!

Thanks for your reply, TIG. I apologize if I wasn't clear.
My program actually draws some rectangles, then the user deletes some of them.
I need to count the number of rectangles left.

@tig said:

Are the rectangles four edges each or faces or groups or component instances?

Faces. I'll add faces using:

rect = Sketchup.active_model.entities
rect.add_face ([x1,y1,0],[x2,y2,0],[x3,y3,0],[x4,y4,0])

@tig said:

If edges/faces are they ever joined together?

No.

@tig said:

Are they arranged so the edges are parallel to the axes?

No. I was actually going to ask if there is a code to change the axes to make it parallel to the rectangles.

@tig said:

Is a rectangle 100x50 the same as one 50x100 ?

Yes, but all rectangles are oriented the same direction. So, if 50x100 then all are 50x100, if 100x50 then all are 100x50.

@tig said:

Are the sizes you gave in inches - i.e. 100" and 50" - or some other units?

It should be inchesI would like to make it inches, but in the code I put above, shouldn't the x's and y's be in pixels.
Thanks TIG

Hi all,
I have a model that is full of different shapes. I need a function that would only count the number of rectangles with dimensions 100x50. Can someone help me with this? Thanks.

Really, Dan, I can't thank you enough. I think I now have my feet on the right path.
I believe I will be a regular here on this forum. Again, many thanks to you and TIG.