Zoom Window Tool [REQUEST]

[JClements]

Is there a way to replace SU's native Zoom Window Tool with a new graphic which is a crosshair so that the starting corner of the tool can be accurately placed?

OR

Could a script create a tool identical to the functioning of the native SU Zoom Window Tool which uses a cross hair graphic?

[Jim]

Entirely possible - I have the code already to make the selection with cross-hairs. Just need help calculating where to move the camera. Ideas, anyone?

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[Dan Rathbun]

Make a class Rect inside your tool class (which is instantiated with the picked rectangle.)
Have instance methods return it's height and center (in screen pixels.)

Save a ref to the current camera eye:
cam = view.camera eye = cam.eye

Calculate a new target as the center of the pick rectangle:
target = view.inputpoint(*rect.center).position

Calulate the new up vector from the directional vector
dir_vec = eye.vector_to(target) up = ? # use trig ?

Set the camera:
view.camera.set( eye, target, up )

Set the zoom factor, by:
dividing the view.vpheight by the pickrect's height to get the zoom factor to pass as the argument to view.zoom( view.vpheight / rect.height )

[Jim]

Here is the non-working tool which needs the do_zoom() method filled in.

zoom-crosshairs-tool.rb

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