Ticket #3981 - Missing possibilities to enter expressions

[chrisb]

There are several places in FreeCAD where I would expect the possibility to enter an expression. If there isn't a special reason why this should be so, then I would collect all of these places and create a ticket. I would guess to fix them one after another is easier than doing it intermittingly.

This is probably rather a 0.19 topic than 0.18, because there is no show stopper among them.

• Placement panel: all input fields should have expressions like they have in the property panel.
• PartDesign: additive and subtractive primitives, their individual values such as radius, height, width, length as well as pitch, yaw, roll
• Part.Extrude; all numeric input fields.
• Part.Revolve; all numeric input fields.
• Part.Mirror; x, y, z
• Part.Fillet; start and end radius. This might be difficult, as the values are somehow copied to a list.
• Part.Chamfer; same situation as with fillets.
• Part.Thickness.

Edit: Updated list:

Mod Edit: Modified thread summary by adding appropriate ticket number

[uwestoehr]

• Placement panel: all input fields should have expressions like they have in the property panel.
• PartDesign: additive and subtractive primitives, their individual values such as radius, height, width, length as well as pitch, yaw, roll
• Part.Extrude; all numeric input fields.
• Part.Revolve; all numeric input fields.
• Part.Mirror; x, y, z
• Part.Fillet; start and end radius. This might be difficult, as the values are somehow copied to a list.
• Part.Chamfer; same situation as with fillets.
• Part.Thickness.

I also vote to add them. However in the first step the fillet and chamfer dialog should should be postponed (the other ones are straight forward).

I also stumbled over some missing expressions today: https://forum.freecadweb.org/viewtopic.php?f=3&t=36458

[Vincent B]

I agree, except for fillet and chamfer, it seems probably never useful and working right

[DeepSOIC]

To support an equation, there must be a direct relation between the value of an input field and a property of some object.

Placement panel: all input fields should have expressions like they have in the property panel.

Hard to do, as the placement dialog has some values that don't directly relate to properties. Placement dialog offers things like center of rotation, yaw-pitch-roll values and "apply incremental changes" checkbox, which break/don't have a direct relation to properties.

PartDesign: additive and subtractive primitives, their individual values such as radius, height, width, length as well as pitch, yaw, roll

Doable, except for roll-pitch-yaw. Roll-pitch-yaw is a little difficult beast, it may be possible to bind expressions to them, but I'm not sure.

Part.Extrude; all numeric input fields.
Part.Revolve; all numeric input fields.

Doable. I think...

Part.Thickness.

Already has one, doesn't it?

Part.Mirror; x, y, z
Part.Fillet; start and end radius. This might be difficult, as the values are somehow copied to a list.
Part.Chamfer; same situation as with fillets.

probably doable, but I'm not sure.


Please don't assume that I have just promised to add that myself

[chrisb]

• Placement panel: all input fields should have expressions like they have in the property panel.
• PartDesign: additive and subtractive primitives, their individual values such as radius, height, width, length as well as pitch, yaw, roll
• Part.Extrude; all numeric input fields.
  ...

I also stumbled over some missing expressions today: https://forum.freecadweb.org/viewtopic.php?f=3&t=36458

This is covered by bullet point two, or isn't it?

[openBrain]

This is covered by bullet point two, or isn't it?

My guess is that it is.

[chrisb]

Updated list from first post, removed thickness and Placement, even X, Y, Z are not directly connected to properties, the depend on the rotation.

• PartDesign: additive and subtractive primitives, their individual values such as radius, height, width, length as well as pitch, yaw, roll
• Part.Extrude; all numeric input fields.
• Part.Revolve; all numeric input fields.
• Part.Mirror; x, y, z
• Part.Fillet; start and end radius. This might be difficult, as the values are somehow copied to a list.
• Part.Chamfer; same situation as with fillets.

[chrisb]

And here is the ticket: issue #3981.

[openBrain]

PartDesign: additive and subtractive primitives, their individual values such as radius, height, width, length as well as pitch, yaw, roll

Doable, except for roll-pitch-yaw. Roll-pitch-yaw is a little difficult beast, it may be possible to bind expressions to them, but I'm not sure.

@DeepSOIC, just want to clearly understand something. AFAIK rotations are internally stored as quaternion (which is fine). And I see that expressions are supported in the Placement property of objects where rotation is expressed as Angle + Axis.
Why should it be more difficult to support expressions on Yaw/Pitch/Roll than on Angle+Axis ? Thx.

[DeepSOIC]

Why should it be more difficult to support expressions on Yaw/Pitch/Roll than on Angle+Axis ? Thx.

Problem is, property editor displays AttachmentOffset's rotation as axis+angle. You can bind expressions there. If I just let bind them to euler angles, the expressions will not show up in property editor, and one will be able to bind other expressions there, creating a conflict. Apart from this "bug", I see nothing difficult about it.