Sketcher ConstrainAngle/en: Difference between revisions

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<languages/>
{{GuiCommand|Name=Constraint InternalAngle|Workbenches=[[Sketcher Workbench|Sketcher]], [[PartDesign Workbench|PartDesign]]|Shortcut=A|MenuLocation=Sketch → Sketcher constraints → Constrain angle|SeeAlso=[[Constraint Length|Constraint Length]], [[Constraint Perpendicular|Constraint Perpendicular]]}}


{{Docnav
====Description====
|[[Sketcher_ConstrainDiameter|Diameter]]
This tool constrains the angle between two selected lines in a sketch to be a specified value. By default, the internal angle, the smaller of the angles formed at the intersection of two lines (or their extensions) is constrained.<br />
|[[Sketcher_ConstrainLock|Lock]]
If a single line is selected, the angle is constrained relative to the horizontal axis of the selected sketcher plane
|[[Sketcher_Workbench|Sketcher]]
|IconL=Sketcher_ConstrainDiameter.svg
|IconR=Sketcher_ConstrainLock.svg
|IconC=Workbench_Sketcher.svg
}}


{{GuiCommand
====Operation====
|Name=Sketcher ConstrainAngle
Select any two lines in the sketch by clicking on them in sequence. They will change colour to dark green when selected. The direction of the line form the first point created to the end point is significant in calculation of the angle between the lines.<br /><br />
|MenuLocation=Sketch → Sketcher constraints → Constrain angle
[[File:ConstrainAngle1.png|256px|<span title="Selected lines"></span>]]<br /><br />
|Workbenches=[[Sketcher_Workbench|Sketcher]]
Then click on the ConstraintAngle icon([[Image:Constraint_InternalAngle.png|16px]]) in the Sketcher or Part Design toolbar or select the ConstrainAngle menu item from the Sketcher constraints sub menu of either the Sketcher (Sketcher workbench) or Part Design (Part Design workbench)menu item to add the constraint. <br /><br />
|Shortcut={{KEY|K}} {{KEY|A}}
The constraint is initially set to the current internal angle between the lines and the Constraint is added to the Tasks tab in the Combo View panel. <br /><br />
|SeeAlso=[[Sketcher_ConstrainPerpendicular|Sketcher ConstrainPerpendicular]]
[[File:ConstrainAngle2.png|256px|<span title="Constraint applied"></span>]]<br /><br />
}}
Doubleclicking on the Constraint in the Tasks tab will bring up a pop-up dialog box in which this value may be edited to set it to a desired value. Alternatively, the datum text in the 3D view may be double clicked to bring up the pop-up dialog to set the value.<br /><br />
[[File:ConstrainAngle3.png|256px|<span title="Editing value"></span>]]<br /><br />
[[File:ConstrainAngle4.png|256px|<span title="Constraint applied"></span>]]<br /><br />
The value can be set to values greater than 180 (or even 360), in which case it becomes a constraint on the external angle and the angle is interpreted as modulo 360 degrees.<br /><br />
The absolute mode is invoked by only selecting one line before applying the constraint.<br /><br />
[[File:ConstrainAngle5.png|256px|<span title="Constraint applied"></span>]]<br /><br />
Applying the constraint, the angle is constrained relative to the horizontal axis of the selected sketch plane.<br /><br />
[[File:ConstrainAngle6.png|256px|<span title="Constraint applied"></span>]]<br /><br />
Selecting the second line which was drawn from the upper right to lower left.<br /><br />
[[File:ConstrainAngle7.png|256px|<span title="Constraint applied"></span>]]<br /><br />
And applying the constraint as before,<br /><br />
[[File:ConstrainAngle8.png|256px|<span title="Constraint applied"></span>]]<br /><br />
the line is now constrained to have a value relative to the direction of the horizontal axis in the clockwise direction (angle values are restricted to 180 degrees anticlockwise or clockwise).<br /><br />
As before by double clicking on the constraint in either the Tasks tab of the Combo view or on the constraint in the 3D view will allow editing of the value of the constrained angle.


==Description==
<languages/>

The [[Image:Sketcher_ConstrainAngle.svg|24px]] [[Sketcher_ConstrainAngle|Sketcher ConstrainAngle]] tool fixes the angle between two edges (lines are then treated as infinite, and open curves are virtually extended as well), the angle of a line with the X axis, or the aperture angle of a circular arc.

==Usage==

See also: [[Sketcher_Workbench#Drawing_aids|Drawing aids]].

===[[Sketcher_Workbench#Continue_modes|Continue mode]]===

# Make sure there is no selection.
# There are several ways to invoke the tool:
#* {{Version|1.0}}: If the {{MenuCommand|Dimensioning constraints}} [[Sketcher_Preferences#General|preference]] is set to {{Value|Single tool}} (default): press the down arrow to the right of the {{Button|[[Image:Sketcher_Dimension.svg||x16px]][[Image:Toolbar_flyout_arrow.svg|x16px]]}} button and select the {{MenuCommand|[[Image:Sketcher_ConstrainAngle.svg|16px]] Constrain angle}} option from the dropdown.
#* If this preference has a different value (and in {{VersionMinus|0.21}}): press the {{Button|[[Image:Sketcher_ConstrainAngle.svg|16px]] [[Sketcher_ConstrainAngle|Constrain angle]]}} button.
#* Select the {{MenuCommand|Sketch → Sketcher constraints → [[Image:Sketcher_ConstrainAngle.svg|16px]] Constrain angle}} option from the menu.
#* {{Version|1.0}}: Right-click in the [[3D_view|3D view]] and select the {{MenuCommand|Dimension → [[Image:Sketcher_ConstrainAngle.svg|16px]] Constrain angle}} option from the context menu.
#* Use the keyboard shortcut: {{KEY|K}} then {{KEY|A}}.
# The cursor changes to a cross with the tool icon.
# Do one of the following:
#* Select two lines.
#* Select a point and two edges (in that order).
#* Select an edge, a point and an edge (idem).
# If a [[Sketcher_ToggleDrivingConstraint|driving dimensional constraint]] is created, depending on the [[Sketcher_Preferences#Display|preferences]], a dialog opens to [[Sketcher_Workbench#Edit_constraints|edit its value]]. A negative value will reverse the angle direction.
# An Angle constraint is added. If a point and two edges have been selected, up to two [[Sketcher_ConstrainPointOnObject|Point to object constraints]] can also be added. See [[#Between_two_edges_at_point|Examples]].
# Optionally keep creating constraints.
# To finish, right-click or press {{KEY|Esc}}, or start another geometry or constraint creation tool.

===Run-once mode===

# Do one of the following:
#* Select a single line.
#* Select a single circular arc.
#* Select two lines.
#* Select a point and two edges (in any order).
# Invoke the tool as explained above.
# Optionally [[Sketcher_Workbench#Edit_constraints|edit the constraint value]].
# An Angle constraint is added. If a point and two edges have been selected, up to two [[Sketcher_ConstrainPointOnObject|Point on object constraints]] can also be added. See [[#Between_two_edges_at_point|Examples]].

==Examples==

===Single line===

[[Image:Sketcher_ConsraintAngle_mode1.png|400px]]

The angle of the line with the positive X axis of the sketch is fixed.

===Single circular arc===

[[Image:Sketcher_ConsraintAngle_mode2.png|400px]]

The aperture angle of the arc is fixed.

===Between two lines===

[[Image:Sketcher_ConsraintAngle_mode3.png|400px]]

The angle between the two lines is fixed. It is not required that the lines intersect.

===Between two edges at point===

[[Image:Sketcher_ConsraintAngle_mode4.png|400px]]

The angle between the two edges at a given point is fixed. The point can be any point, e.g. the center of a circle, the endpoint of an edge, or the origin, it can belong to either or both edges, and it can also be a [[Sketcher_CreatePoint|Point object]]. If required [[Sketcher_ConstrainPointOnObject|Point on object constraint(s)]] are added to ensure the point lies on both (extended) edges. These additional constraints are called [[Sketcher_helper_constraint|helper constraints]].

==Scripting==

Angle Constraint can be created from [[Macros|macros]] and from the [[Python|Python]] console by using the following:
{{Code|code=
# line slope angle
Sketch.addConstraint(Sketcher.Constraint('Angle',iline,angle))

# angular span of arc
Sketch.addConstraint(Sketcher.Constraint('Angle',iarc,angle))

# angle between lines
Sketch.addConstraint(Sketcher.Constraint('Angle',iline1,pointpos1,iline2,pointpos2,angle))

# angle-via-point (no helper constraints are added automatically when from python)
Sketch.addConstraint(Sketcher.Constraint('AngleViaPoint',icurve1,icurve2,geoidpoint,pointpos,angle))
}}
where:
:* {{incode|Sketch}} is a sketch object
:* {{incode|iline, iline1, iline2}} are integers specifying the lines by their ordinal numbers in {{incode|Sketch}}.
:* {{incode|pointpos1, pointpos2}} should be 1 for start point and 2 for end point. The choice of endpoints allows to set internal angle (or external), and it affects how the constraint is drawn on the screen.
:* {{incode|geoidpoint}} and {{incode|pointpos}} in {{incode|AngleViaPoint}} are the indexes specifying the point of intersection.
:* {{incode|angle}} is the angle value in radians. The angle is counted between tangent vectors in counterclockwise direction. Tangent vectors are pointing from start to end for the lines (or vice versa if ending point is supplied in angle between lines mode), and along counterclockwise direction for circles, arcs and ellipses. Quantity is also accepted as an angle (e.g. {{incode|App.Units.Quantity('45 deg')}})

The [[Sketcher_scripting|Sketcher scripting]] page explains the values which can be used for {{incode|iline}}, {{incode|iline1}}, {{incode|iline2}}, {{incode|pointpos1}}, {{incode|pointpos2}}, {{incode|geoidpoint}} and {{incode|pointpos}} and contains further examples on how to create constraints from Python scripts.


{{Docnav
|[[Sketcher_ConstrainDiameter|Diameter]]
|[[Sketcher_ConstrainLock|Lock]]
|[[Sketcher_Workbench|Sketcher]]
|IconL=Sketcher_ConstrainDiameter.svg
|IconR=Sketcher_ConstrainLock.svg
|IconC=Workbench_Sketcher.svg
}}

{{Sketcher_Tools_navi{{#translation:}}}}
{{Userdocnavi{{#translation:}}}}

Revision as of 15:19, 23 April 2024

Sketcher ConstrainAngle

Menu location
Sketch → Sketcher constraints → Constrain angle
Workbenches
Sketcher
Default shortcut
K A
Introduced in version
-
See also
Sketcher ConstrainPerpendicular

Description

The Sketcher ConstrainAngle tool fixes the angle between two edges (lines are then treated as infinite, and open curves are virtually extended as well), the angle of a line with the X axis, or the aperture angle of a circular arc.

Usage

See also: Drawing aids.

Continue mode

  1. Make sure there is no selection.
  2. There are several ways to invoke the tool:
    • introduced in version 1.0: If the Dimensioning constraints preference is set to Single tool (default): press the down arrow to the right of the button and select the Constrain angle option from the dropdown.
    • If this preference has a different value (and in version 0.21 and below): press the Constrain angle button.
    • Select the Sketch → Sketcher constraints → Constrain angle option from the menu.
    • introduced in version 1.0: Right-click in the 3D view and select the Dimension → Constrain angle option from the context menu.
    • Use the keyboard shortcut: K then A.
  3. The cursor changes to a cross with the tool icon.
  4. Do one of the following:
    • Select two lines.
    • Select a point and two edges (in that order).
    • Select an edge, a point and an edge (idem).
  5. If a driving dimensional constraint is created, depending on the preferences, a dialog opens to edit its value. A negative value will reverse the angle direction.
  6. An Angle constraint is added. If a point and two edges have been selected, up to two Point to object constraints can also be added. See Examples.
  7. Optionally keep creating constraints.
  8. To finish, right-click or press Esc, or start another geometry or constraint creation tool.

Run-once mode

  1. Do one of the following:
    • Select a single line.
    • Select a single circular arc.
    • Select two lines.
    • Select a point and two edges (in any order).
  2. Invoke the tool as explained above.
  3. Optionally edit the constraint value.
  4. An Angle constraint is added. If a point and two edges have been selected, up to two Point on object constraints can also be added. See Examples.

Examples

Single line

The angle of the line with the positive X axis of the sketch is fixed.

Single circular arc

The aperture angle of the arc is fixed.

Between two lines

The angle between the two lines is fixed. It is not required that the lines intersect.

Between two edges at point

The angle between the two edges at a given point is fixed. The point can be any point, e.g. the center of a circle, the endpoint of an edge, or the origin, it can belong to either or both edges, and it can also be a Point object. If required Point on object constraint(s) are added to ensure the point lies on both (extended) edges. These additional constraints are called helper constraints.

Scripting

Angle Constraint can be created from macros and from the Python console by using the following:

# line slope angle
Sketch.addConstraint(Sketcher.Constraint('Angle',iline,angle))

# angular span of arc
Sketch.addConstraint(Sketcher.Constraint('Angle',iarc,angle))

# angle between lines
Sketch.addConstraint(Sketcher.Constraint('Angle',iline1,pointpos1,iline2,pointpos2,angle))

# angle-via-point (no helper constraints are added automatically when from python)
Sketch.addConstraint(Sketcher.Constraint('AngleViaPoint',icurve1,icurve2,geoidpoint,pointpos,angle))

where:

  • Sketch is a sketch object
  • iline, iline1, iline2 are integers specifying the lines by their ordinal numbers in Sketch.
  • pointpos1, pointpos2 should be 1 for start point and 2 for end point. The choice of endpoints allows to set internal angle (or external), and it affects how the constraint is drawn on the screen.
  • geoidpoint and pointpos in AngleViaPoint are the indexes specifying the point of intersection.
  • angle is the angle value in radians. The angle is counted between tangent vectors in counterclockwise direction. Tangent vectors are pointing from start to end for the lines (or vice versa if ending point is supplied in angle between lines mode), and along counterclockwise direction for circles, arcs and ellipses. Quantity is also accepted as an angle (e.g. App.Units.Quantity('45 deg'))

The Sketcher scripting page explains the values which can be used for iline, iline1, iline2, pointpos1, pointpos2, geoidpoint and pointpos and contains further examples on how to create constraints from Python scripts.