Questions about realization of tools

thomthom

#1. You make special cases for that. When you don´t hit any geometry, Make a pickray and see if it intersects any of the XY, XZ, YZ planes.

#2. Don´t think you can with just pure Ruby. The native tools do that because they are done in C++ and capture the mouse. Unfortunatly there is no way to capture the mouse from the Ruby API.

dacastror

@thomthom said:

#1. You make special cases for that. When you don´t hit any geometry, Make a pickray and see if it intersects any of the XY, XZ, YZ planes.

Thomthom thank you very much!, That's what I'll do

@thomthom said:

#2. Don´t think you can with just pure Ruby. The native tools do that because they are done in C++ and capture the mouse. Unfortunatly there is no way to capture the mouse from the Ruby API.

It is a pity. I thought this might serve me

require 'Win32API'
 
getCursorPos = Win32API.new("user32", "GetCursorPos", ['P'], 'V')
lpPoint = " " * 8 # store two LONGs
getCursorPos.Call(lpPoint)
x, y = lpPoint.unpack("LL") # get the actual values
coor_mouse = " y = #{x},  x = #{y}"

but at the end I think can not because onMouseMove only respond within the drawing window.

any suggestions to prevent my tool display incomplete?

.

thomthom

What if you also hook into the event callback of when the cursor moves? Ignoring the Tool class' events?

thomthom

@dacastror said:

any suggestions to prevent my tool display incomplete?

?

Jim

@thomthom said:

@dacastror said:

any suggestions to prevent my tool display incomplete?

?

getExtents, maybe.

http://www.sketchup.com/intl/en/developer/docs/ourdoc/tool#getExtents

dacastror

@jim said:

getExtents, maybe.

thank you very much Jim!, this solved the problem, cost me a bit to understand how to implement it, but it goes

@thomthom said:

What if you also hook into the event callback of when the cursor moves? Ignoring the Tool class' events?

I tried but it works very slow when the cursor is outside the window of Sketchup,

thomthom

Got a bare bone example that shows this slowness?

dacastror

@thomthom said:

Got a bare bone example that shows this slowness?

Yes,

require 'Win32API'
 
Thread.new {
   x=1 
   while (x<1000) do
     getCursorPos = Win32API.new("user32", "GetCursorPos", ['P'], 'V')
     lpPoint = " " * 8 # store two LONGs
     getCursorPos.Call(lpPoint)
     x, y = lpPoint.unpack("LL") # get the actual values
     coor_mouse = "  #{x},  #{y}"
     Sketchup;;set_status_text coor_mouse, SB_VCB_VALUE
   end
}

Note : to see how slow returns coordinates, should be small the Sketchup window and put the cursor outside it, to stop the program move the cursor to the right until x >1000

(Google Translator)

thomthom

Threads doesn't work well in SketchUp Ruby. It's Ruby 1.8 and they are not true threads.

And I see you are polling GetCursorPos. I was thinking if there might be a callback function you could register instead.

dacastror

@thomthom said:

Threads doesn't work well in SketchUp Ruby. It's Ruby 1.8 and they are not true threads.

I did not know this , thanks

dacastror

I give up, I can not understand how to use view.pickray x, y for the intersection with the XY, XZ and YZ, and thereby be able to guide a tool, really I can not see how this is done

I could only understand that returns two points, one coincides with the point of view and the other (I think) is a vector pointing toward the cursor, but do not understand how to use this to get the intersection with the respective flat front or behind me

Dan Rathbun

View.pickray() can take ANY screen co-ordinate (it can be, or may not be the mouse position.)

It returns a ray

@unknownuser said:

A ray is a two element array containing a point and a vector [ Geom::Point3d, Geom::Vector3d ]. The point defines the start point of the ray and the vector defines the direction.

Dan Rathbun

Perhaps you wish to use model#raytest ?

It can return objects it hits.

View#pickray() does not, by itself, "hit" anything, but could be used for the 1st argument to Model#raytest().

dacastror

Guys, how to remove an observer of tools? I created an observer slightly modifying the example shown in the API


class MyToolsObserver < Sketchup;;ToolsObserver
   def onActiveToolChanged(tools, tool_name, tool_id)
      if tool_id == 21100
         puts "tool x"
      end
   end
end

Sketchup.active_model.tools.add_observer(MyToolsObserver.new)

I thought you could with something like this:

Sketchup.active_model.tools.remove_observer(MyToolsObserver)

What is the correct way to remove this observer?

thomthom

Keep a reference to the observer instance.

<span class="syntaxdefault"><br /></span><span class="syntaxkeyword">@</span><span class="syntaxdefault">tool_observer&nbsp;</span><span class="syntaxkeyword">=&nbsp;</span><span class="syntaxdefault">MyToolsObserver</span><span class="syntaxkeyword">.new<br /><br /></span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_model</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">tools</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">add_observer</span><span class="syntaxkeyword">(@</span><span class="syntaxdefault">tool_observer</span><span class="syntaxkeyword">)<br /><br /></span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_model</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">tools</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">remove_observer</span><span class="syntaxkeyword">(@</span><span class="syntaxdefault">tool_observer</span><span class="syntaxkeyword">)<br />&nbsp;</span><span class="syntaxdefault"></span>

dacastror

@dan rathbun said:

A ray is a two element array containing a point and a vector [ Geom::Point3d, Geom::Vector3d ]. The point defines the start point of the ray and the vector defines the direction.

Thanks Dan, I now understand better

@dan rathbun said:

Perhaps you wish to use model#raytest ?
It can return objects it hits.
View#pickray() does not, by itself, "hit" anything, but could be used for the 1st argument to Model#raytest().

I've never used it, looks interesting I'll give a look.
For now solve the problem using the parametric form of the line;

x = x0 + ta
y = y0 + tb
z = z0 + t*c

in my case a, b, c is associated with Geom :: Vector3D (parallel to the line)
and x0, y0, z0 is associated with Geom :: Point3D (content in the line)
the intersection with plane z=0 (XY plane), for example would be


ray = view.pickray x, y  #ray[0] -> Point3D, ray[1] -> Vector3d
if ray[1].z.abs>0
   z1 = 0 #Interesting plane
   t1 = (z1-ray[0].z)/ray[1].z
   x1 = ray[0].x + t1*ray[1].x
   y1 = ray[0].y + t1*ray[1].y 
end
#x1,y1,z1 are coordinates of the point of intersection with the plane

For the other two planes is very similar, although in my case I want to compare the different distances of the planes to the point of "eye" for this I did the following


ray = view.pickray x, y

if ray[1].z.abs>0
   z1 = 0 #Interesting plane
   t1 = (z1-ray[0].z)/ray[1].z
   d1 = (t1*ray[1].x)**2 + (t1*ray[1].y)**2 + (z1-ray[0].z)**2
end
#d1 is the square of the distance from the eye to the plane

dacastror

Thom thank you very much, really I could not understand how to do this

thomthom

The API doc examples are confusing. One learn the hard way.

dacastror

is true, on several occasions have been very frustrating these examples

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