Planes

[TIG]

You define a transformation, then you apply it to an object.
There are several types of transformation for placing, translating, rotating, scale/mirroring etc

So
tr=Geom::Transformation.rotation(point, vector, angle)
sets up a rotation transformation, then
master_group.transform!(tr)
transforms the master_group using 'tr'...
'point' is the Point3d you want as the rotation's anchor.
'vector' is the vector around which the rotation will take place.
'angle' is the angle in radians - if you have calculated it [as an angle_between vectors for example] it's already in radians - if you are typing it there is a user friendly method 90.degrees instead of the equivalent Math::PI/2...
So to rotate it 90 degrees around the z-axis anchored at the origin it'd be
tr=Geom::Transformation.rotation(ORIGIN, Z_AXIS, 90.degrees)
or
tr=Geom::Transformation.rotation([0,0,0], [0,0,1], 90.degrees)
If you are rotating something 'on' a face the point is on the face and the face.normal is the vector around which the rotation is made - the angle is arbitrary.
The if test I added was to check if the object needed rotation...
rotationangle = Z_AXIS.angle_between(face.normal) perpvector = Z_AXIS.cross(face.normal) tr = Geom::Transformation.rotation(@ip1,perpvector,angle) if perpvector.length!=0
The cross method returns a vector at right-angles to the two vectors - useful for a rotations like you want... the if...length...not... test is to check that the perpvector is valid - i.e. if the 'cross' fails because the two vectors 'crossed' don't have a right-angled result [i.e. no rotation is needed?]...

[lasersage]

looks good thanks Tig.
I'm off for the weekend now, but I've just sent all the files to my home email so I'll see if I can find time to have a bash at it in my own time.
I'll let you know how it goes on monday.
Thanks again for the help so far, I'd be stuck without it

[lasersage]

OK I've had a look at it but not really got anywhere
I've tried both:
tr=Geom::Transformation.rotation(point, vector, angle)
tr=Geom::Transformation.rotation(ORIGIN, Z_AXIS, 90.degrees)

just to make sure there wasn't a problem here, and had
puts "transformation " + tr.to_s
put what looks like a reasonable output into the console.
All OK, but whenever I run the program it bugs out to the old click drag click error message and the console shows:

Error: #<TypeError: no implicit conversion to Transformation>
C:/Program Files/Google/Google SketchUp 7/Plugins/test5.rb:117:in transform!' C:/Program Files/Google/Google SketchUp 7/Plugins/test5.rb:117:in onLButtonDown'

So what it wrong with my transform! bit?
I've tried it as:
master_group = master_group.transform!(tr)
&
master_group.transform! tr

after the loop and before it (straight after master_group is defined). None of it works, it always gives me this daft conversion message. But I'm convinced the first bit of code does give a valid transformation, so why does it then think it the wrong type or something?
It can't just be down to where I'm placing the
master_group.transform! tr
line in the code can it?

[TIG]

You make a transformation and apply it to the group.
...So...
define or get point, vector and angle
...then...
tr=Geom::Transformation.rotation(point,vector,angle)
...then...
master_group.transform!(tr)
The ! at the end of the transform method changes the original object if tr is a transformation.
If you add puts tr.class what do you get - it looks like it's not a real transformation to me ...
The second one with the values set shouldwork OK ?
Pre-set the variables you use outside of all of your 'do loops' or {} blocks - e.g point=[], vector=[], angle=0.0, tr=nil etc near the start of the script...
It might be that they are not getting transfered between the loops - setting them first means they will be...

[lasersage]

when I added the =0.0, =nil etc. line of code nothing changed,
and when I tried "trans class " + tr.class
it gave me a cannot be displayed as string message, so I did tr.class.to_s and that gave me:
point (503.690114mm, 371.165908mm, 943.266108mm)
angle 1.5707963267949
perpvector (1.0, -6.27276008913213e-015, 0.0)
transformation #Geom::Transformation:0xba74610
trans class Geom::Transformation
Error: #<TypeError: no implicit conversion to Transformation>
C:/Program Files/Google/Google SketchUp 7/Plugins/test5.rb:170:in transform!' C:/Program Files/Google/Google SketchUp 7/Plugins/test5.rb:170:in onLButtonDown'

So it looks like the transformation is OK, but it doesn't like it when it calls transform! .
My geom::transformation line is just after the first click but before the loop, my transform! line is after the loops.
Any ideas?

[TIG]

Add these lines after the transformation ' tr' is supposedly made
puts tr.class return nil
The Ruby Console should shown what tr is - don't mess on with t o_s etc.
It should just say it's a Geom::Transformation - nothing else...
The return nil just stops execution at that point so you don't have to wait for a later failure...
You seem to be messing up something called trans and something called tr here can you publish the part of the code so we can see what is going wrong ?
What is trans ?
Are you somehow putting stuff into an array (==[]) in error ?

[lasersage]

Here's the code in full, I'd only held off posting it till now as I was keen to learn enough to fix it myself, but as this is getting frustrating I'll welcome any solutions

the initialization of the variables is hashed out because I changed it to initialize in the def initialize sub, rather than here. Not sure if that's good or not though as they might need to be "@point" to carry the value over.

Hope you can decipher it with all the wordwraping, I tend to leave long lines and comments, I was going to tidy up the defunct code hashed out when I finally got it working.

def onLButtonDown(flags, x, y, view)
    # When the user clicks the first time, we switch to getting the
    # second point.  When they click a second time we create the line
	
		#point=[], perpvector=[], angle=0.0, tr=nil
    if( @state == 0 )
        @ip1.pick view, x, y
        if( @ip1.valid? )
            @state = 1
            Sketchup;;set_status_text $exStrings.GetString("Select second point (top right)"), SB_PROMPT
            @xdown = x
            @ydown = y
			face = @ip1.face
			puts "facenormal " + face.normal.to_s
			angle = Z_AXIS.angle_between(face.normal)
			perpvector = Z_AXIS.cross(face.normal)
			point = @ip1.position
			tr = Geom;;Transformation.rotation(point,perpvector,angle) if perpvector.length!=0
			#tr=Geom;;Transformation.rotation(ORIGIN, Z_AXIS, 90.degrees)
			puts "point " + point.to_s, "angle " + angle.to_s, "perpvector " + perpvector.to_s, "transformation " + tr.to_s, "trans class " + tr.class.to_s, tr.class
			
			if face == nil
				UI.messagebox "The points must be on the face of an object"
				self.reset
			end
        end
    else
        # create the line on the second click
        if( @ip2.valid? )
            self.create_geometry(@ip1.position, @ip2.position,view)
			@ip2.pick view, x, y
			
				model = Sketchup.active_model
				entities = model.entities
				master_group = entities.add_group()
				#master_group = master_group.transform!(tr)
				
				numsquaresX = 10 	#number of squares in the X direction
				xsize = 30			#size of squares in the X direction (mm)
				xsize = xsize/25.4  #converts xsize into mm (from inches)
				numsquaresY = 10	#number of squares in the Y direction
				#ysize = 3			#size of squares in the Y direction
				#ysize = ysize/25.4 #converts ysize into mm (from inches)
				ysize = xsize		#as we're generally only dealing with squares, edit this line out and reinstate the two above lines for rectangles
				zsize = xsize
				z = 0
				
				x1 = @ip1.position.x
				y1 = @ip1.position.y
				z1 = @ip1.position.z
				
				xfinal = @ip2.position.x
				yfinal = @ip2.position.y
				zfinal = @ip2.position.z
				
				#puts x1, y1, z1, xfinal, yfinal, zfinal
				if (xfinal - x1) > (25 * xsize)
					largetest = UI.messagebox "You have selected a large area, this may make the program unstable. Suggest multiple smaller areas", MB_OKCANCEL
					if largetest == 2
						self.reset
					end
				end

				while y1 < yfinal
					y2 = y1 + ysize
					while x1 < xfinal
						x2 = x1 + xsize
						pt1 = [x1, y1, z]									#plot the first line
						pt2 = [x1, y2, z]									#plot the second line
						pt3 = [x2, y2, z]									#plot the third line
						pt4 = [x2, y1, z]									#plot the fourth line, back to start
						#new_face = entities.add_face pt1, pt2, pt3, pt4	#plot a face on the square to make it visible
						#group.entities.add_face pt1, pt2, pt3, pt4

						group = master_group.entities.add_group
						face = group.entities.add_face pt1, pt2, pt3, pt4
												
						x1 = x2 - (xsize * 0.08) #let the next spot begin at 92% of the way across the previous
						Sketchup;;set_status_text $exStrings.GetString("Working"), SB_PROMPT
						#puts "Point1 " + pt1.to_s, "Point2 " + pt2.to_s, "Point3 " + pt3.to_s, "Point4 " + pt4.to_s
					end
					y1 = y2 - (ysize * 0.08) #let the next spot begin at 92% of the way across the previous
					#x1 = x1 - (xsize * 0.92 * xstep) #go back to initial x position for next line in y
					x1 = @ip1.position.x
				end
			master_group.transform! tr
			self.reset(view)
        end #end click 2
    end
    
    # Clear any inference lock
    view.lock_inference
end

let me know if you want me to send the complete .rb files, as this chunk of code wont run without the other def's around it

[TIG]

Looks like you need to have tr defined no matter what e.g.
tr=Geom::Transformation.rotation(ORIGIN, Z_AXIS, 0.degrees) if not perpvector
so that transform!(tr) always has something to work on ?

[lasersage]

Well I added that line:
tr=Geom::Transformation.rotation(ORIGIN, Z_AXIS, 0.degrees) if not perpvector
right next to the other tr = Geom::..... line but its still doing the same thing.
Do you think it'd help if I just sent you the full .rb file so you could where it runs too?

It always seems to give the class as geom::transformation in the console, but whenever I uncomment the transform! line then it has trouble

[TIG]

PM me the ruby and I'll try and look at it later today...

[cjthompson]

I think the problem is that you define tr in a seperate place than you use it. try replacing tr with @tr.

[lasersage]

Well I thought that was a long shot as it was defined and used in the same def, but I'd forgotten about the initialize def. Sure enough @tr has got it!!!!
Thanks very much.

So its rotating and displaying it just as you'd expect, off floating in space to the side.
I'll have a go at the translation code and see how that goes.

Thanks very much guys, really pleased this is coming together.