How do I select individual entities from within a sketch?

thom_smith895

Hi,
This is a very basic question, but I've struggled to find examples to move me past this problem.  
I'd like to take two circles from a sketch and extrude one of them upwards, and one downwards.  

The only example I have managed to find extrudes the whole sketch:

<div>opExtrude(context, id + "extrude2", {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "entities" : qSketchRegion(id + "sketch2", true),</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "direction" : -connectorNormal,</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "endBound" : BoundingType.BLIND,</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "endDepth" : cDepth * millimeter</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; });</div>

I need to query for "circle1" within "sketch2", and separately "circle2" within the same sketch.  

Can anyone help?

kevin_o_toole_1

You can query for individual sketch entities (that is, edges) with sketchEntityQuery().

Here's an example of that:
https://cad.onshape.com/documents/f4e19ad0a844db1cee04d131/w/f5ff2d97514cf25db4341773/e/a7e5fd093af8c6918096d9fc

However (and this often trips up FeatureScript authors), this only works for the sketch edges, not sketch regions. When you create a sketch with a collection of edges, Onshape creates a region for every bounded area (so, 3 regions for two overlapping circles) and there's no way to say after-the-fact that one region was "created" by one edge, since there's no mapping between those things in the general case.

This means the simplest way to query for separate regions is to just make two sketches and use qSketchRegion(). If you do need a single sketch (say, with regions that overlap), the second simplest thing to do is to query a single region with qContainsPoint().

Let us know if you have more questions!

kevin_o_toole_1

You can query for individual sketch entities (that is, edges) with sketchEntityQuery().

Here's an example of that:
https://cad.onshape.com/documents/f4e19ad0a844db1cee04d131/w/f5ff2d97514cf25db4341773/e/a7e5fd093af8c6918096d9fc

However (and this often trips up FeatureScript authors), this only works for the sketch edges, not sketch regions. When you create a sketch with a collection of edges, Onshape creates a region for every bounded area (so, 3 regions for two overlapping circles) and there's no way to say after-the-fact that one region was "created" by one edge, since there's no mapping between those things in the general case.

This means the simplest way to query for separate regions is to just make two sketches and use qSketchRegion(). If you do need a single sketch (say, with regions that overlap), the second simplest thing to do is to query a single region with qContainsPoint().

Let us know if you have more questions!

emagdalenaC2i

Why you don't create a sketch for each circle?

thom_smith895

Kevin, emagdalena,

Many thanks.  For simplicity I have created the features I need with separate sketches.  

Kevin, thanks for the coded example of sketchEntityQuery().  An index of coded examples like yours (perhaps linked to from the Standard Library) would be a massive step forward in speeding up the learning this language.  

Thanks again.

EricZ

kevin_o_toole_1 said:

You can query for individual sketch entities (that is, edges) with sketchEntityQuery().

Here's an example of that:
https://cad.onshape.com/documents/f4e19ad0a844db1cee04d131/w/f5ff2d97514cf25db4341773/e/a7e5fd093af8c6918096d9fc

However (and this often trips up FeatureScript authors), this only works for the sketch edges, not sketch regions. When you create a sketch with a collection of edges, Onshape creates a region for every bounded area (so, 3 regions for two overlapping circles) and there's no way to say after-the-fact that one region was "created" by one edge, since there's no mapping between those things in the general case.

This means the simplest way to query for separate regions is to just make two sketches and use qSketchRegion(). If you do need a single sketch (say, with regions that overlap), the second simplest thing to do is to query a single region with qContainsPoint().

Let us know if you have more questions!

however qContainsPoint() has to use a vector in 3D point, but on the 2D sketch is there some other simple way? 

NeilCooke

You can use toWorld() to convert a point location on your sketch to a 3D point.