Where's My Inference Dots?

Jim

Shouldn't this produce inference dots? It's only a slightly modified linetool.rb.


require 'sketchup'

class JimTool
    def activate
        @ip = Sketchup;;InputPoint.new
        @ip1 = Sketchup;;InputPoint.new
    end
    def onMouseMove(flags, x, y, view)
        @ip.pick(view, x, y)
        if @ip != @ip1
            view.invalidate if @ip.display? or @ip1.display?
            @ip1.copy!(@ip)
            view.tooltip = @ip1.tooltip
        end
    end
end

Sketchup.active_model.select_tool(JimTool.new)

thomthom

No, you're not drawing anything - so nothing should appear. Are you getting inference dots?

thomthom

I see, you want to draw the inference points. You must call the .draw method for the InputPoint in the Tool's draw event.


require 'sketchup'

class JimTool
    def activate
        @ip = Sketchup;;InputPoint.new
        @ip1 = Sketchup;;InputPoint.new
    end
    def onMouseMove(flags, x, y, view)
        @ip.pick(view, x, y)
        if @ip != @ip1
            view.invalidate if @ip.display? or @ip1.display?
            @ip1.copy!(@ip)
            view.tooltip = @ip1.tooltip
        end
    end
    def draw(view)
        @ip1.draw if @ip1.valid?
    end
end

Sketchup.active_model.select_tool(JimTool.new)

Jim

Thank you. I just wish the answer wasn't so obvious!

/me smacks forehead.

thomthom

I'm not sure if you need to use two InputPoints...
The Docs says that the pick method returns true only if the picked entity is different from the last pick. So I'd think it should be enough to just use the one and invalidate only when pick returns true. Think I'm doing this with my current tool I'm working on.

Chris Fullmer

I could be way off, but I was thinking it was an optimization thing. I think they are just checking to see if the inputpoint changed, and only if it changes do they refire the draw method. Otherwise each pixel move of the mouse creates a new IP point, and therefore refires the draw method with each pixel movement, even if the IPpoint is already drawn. So testing to see if its a new point will make it only redraw it each time there is a new point to draw. Not each pixel the mouse moves. Again, that is untested recently but that has been my understanding of the example they provide.

Chris

thomthom

@chris fullmer said:

I could be way off, but I was thinking it was an optimization thing. I think they are just checking to see if the inputpoint changed, and only if it changes do they refire the draw method.
Chris

But as the manual says:

@unknownuser said:

true if a valid InputPoint was picked and it is different than it was before.

From that, it sounds like the InputPoint object is performing the check for you. It returns true only if it's different from the last time you called pick.]
(Note: I haven't tested that the implementation actually works as the manual says it should. We have enough examples of deviance... )