Std Placement
Std Placement |
Menu location |
---|
Edit → Placement... |
Workbenches |
All |
Default shortcut |
None |
Introduced in version |
- |
See also |
Std Alignment, Tasks Placement, Placement |
Description
The Std Placement command displays the Placement task panel for a selected object.
The Placement task panel
Usage
- Select a single object that has a DataPlacement property in the property editor.
- Select the Edit → Placement... option from the menu.
- Change one or more of the translation and rotation parameters.
- Do one of the following:
- Press the OK button to apply the changes and close the task panel.
- Press the Apply button to apply the changes, but keep the task panel open for further changes.
- Press Esc or the Cancel button to abort the operation. This will undo any changes that have not been applied.
The dialog can also be launched by clicking on the ellipsis button ... that appears in the property editor when you click on the DataPlacement property.
Notes
- For more information about the placement parameters see the Tasks Placement and Placement pages, and the Aeroplane tutorial.
Scripting
See also: FreeCAD Scripting Basics.
See the Python scripting tutorial.
A placement is internally defined by a matrix; in many cases it is simpler to represent it by means of two components, a Base
point (vector), and a Rotation
value. The Rotation
itself has different representations; it can be entirely defined by the value of a "quaternion" (xi + yj + zk + w)
, but it can also be described by a rotation Axis
(unit vector) and a rotation Angle
(radians).
import FreeCAD as App
doc = App.newDocument()
obj = doc.addObject("Part::Cylinder", "Cylinder")
print(obj.Placement)
# Placement [Pos=(0,0,0), Yaw-Pitch-Roll=(0,0,0)]
print(obj.Placement.Base)
# Vector (0.0, 0.0, 0.0)
print(obj.Placement.Rotation)
# Rotation (0.0, 0.0, 0.0, 1.0)
print(obj.Placement.Rotation.Angle)
# 0.0
print(obj.Placement.Rotation.Axis)
# Vector (0.0, 0.0, 1.0)
print(obj.Placement.Rotation.Q)
# (0.0, 0.0, 0.0, 1.0)
Move the base point of the object, then rotate the object 45 degrees around the X axis.
import math
obj.Placement.Base = App.Vector(5, 3, 1)
obj.Placement.Rotation.Axis = App.Vector(1, 0, 0)
obj.Placement.Rotation.Angle = math.radians(45)
print(obj.Placement)
# Placement [Pos=(5,3,1), Yaw-Pitch-Roll=(0,0,45)]
print(obj.Placement.Rotation.Q)
# (0.3826834323650898, 0.0, 0.0, 0.9238795325112867)
print(obj.Placement.Matrix)
# Matrix ((1,0,0,5),(0,0.707107,-0.707107,3),(0,0.707107,0.707107,1),(0,0,0,1))
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