[Crash] Sketcher: Trimming slot results in crasher

[chrisb]

If we consider point-on-curve to be overlapping, then I don't see why coincident should not be considered overlapping.

I am no friend of too fancy and tricky functions. So I am all with Gene here. If you want to delete an arc, delete it. If you want to trim a line trim it. But don't use some other function for it. There may be users who will appreciate it, but there will also be users, who don't.

There is something fundamentally different between point-on-object and coincidence. In the general case point on object means that one line ends there, while the other doesn't; so there is something which can be trimmed. Coincidence means the both coincident elements end there and nothing is to be trimmed.

The wiki may describe things wrong, then either the wiki or the implementation should be fixed. I hope we can agree that we cannot derive from this, that anything coded is questionable.

Errors can in many cases be handled more gracefully, and perhaps this should at most throw a warning. But it shouldn't do anything with the sketch.

[davidosterberg]

I am no friend of too fancy and tricky functions. So I am all with Gene here. If you want to delete an arc, delete it. If you want to trim a line trim it. But don't use some other function for it. There may be users who will appreciate it, but there will also be users, who don't.

You guys are consistently old school

There is something fundamentally different between point-on-object and coincidence. In the general case point on object means that one line ends there, while the other doesn't; so there is something which can be trimmed. Coincidence means the both coincident elements end there and nothing is to be trimmed.

I guess what you mean is, there is nothing left after trimming?

In this video you can see that Fusion 360 allows to trim away complete segments: https://youtu.be/6Jl82sKd5L8?t=243. I will check what Creo does tomorrow at work. I know you don't consider that an argument in itself. But at least it looked convenient in the video.

[abdullah]

The Trim function does awkward things. Irrespective of whether refusing to trim may or may not be the intended behaviour, it has problems regarding wrapping around 2*pi. Chrisb's is a good example of that. Which is motivating me to work on it.

I am currently working towards refactoring the trim function and adding some goodies (that are convenient for testing the functionality).

Screenshot_20210114_084411.png (3.31 KiB) Viewed 941 times

[chrisb]

You guys are consistently old school

Thanks! We call it experience.

In this video you can see that Fusion 360 allows to trim away complete segments: https://youtu.be/6Jl82sKd5L8?t=243.

The continuous mode looks indeed interesting. You may have noted that the author warns not to touch any unwanted part though. I still dare to claim, that it is in most cases unwanted to remove a whole geometric element, because in most cases it wouldn't have been created in the first place.

I mean we are in Sketcher, we construct a new sketch, and in some cases what we did is wrong, and has to be removed. But this is not the most common use case when trimming.

[davidosterberg]

I still dare to claim, that it is in most cases unwanted to remove a whole geometric element, because in most cases it wouldn't have been created in the first place.

Disagree. I think that if the user clicked on the line it was because he wanted it gone. Why else would he click on it with the trim tool active. For sure he is careful where he clicks when using this tool.

[abdullah]

Well, the new trimming handler shows where it is going to cut before clicking, so that you know what to expect...

[davidosterberg]

Well, the new trimming handler shows where it is going to cut before clicking, so that you know what to expect...

Awesome Abdullah. Keep them coming!

[davidosterberg]

I will check what Creo does tomorrow at work. I know you don't consider that an argument in itself. But at least it looked convenient in the video.

Ok, not quite tomorrow. But here it goes. As you can see, Creo 7 supports trimming whole segments. Both in click mode, and continuous mode.
Really there is nothing strange about it. It is how it is done.