Sketcher ConstrainAngle: Difference between revisions
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==Examples== |
==Examples== |
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===Single line=== <!--T:31--> |
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</translate> |
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[[Image:Sketcher_ConsraintAngle_mode1.png|400px]] |
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'''Accepted selection:''' line |
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<translate> |
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[[Image:Sketcher ConsraintAngle mode1.png|600px]] |
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The constraint sets the polar angle of line's direction. It is the angle between the line and X axis of the sketch. |
The constraint sets the polar angle of line's direction. It is the angle between the line and X axis of the sketch. |
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=== |
===Single circular arc=== <!--T:33--> |
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</translate> |
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[[Image:Sketcher_ConsraintAngle_mode2.png|400px]] |
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'''Accepted selection:''' arc of circle |
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<translate> |
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[[Image:Sketcher ConsraintAngle mode2.png|600px]] |
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In this mode, the constraint fixes angular span of a circular arc. |
In this mode, the constraint fixes angular span of a circular arc. |
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===Between lines=== <!--T:34--> |
===Between two lines=== <!--T:34--> |
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</translate> |
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[[Image:Sketcher_ConsraintAngle_mode3.png|400px]] |
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'''Accepted selection:''' line + line |
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<translate> |
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[[Image:Sketcher ConsraintAngle mode3.png|600px]] |
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In this mode, the constraint sets the angle between two lines. It is not required that the lines intersect. |
In this mode, the constraint sets the angle between two lines. It is not required that the lines intersect. |
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===Between |
===Between two edges at point (angle-via-point)=== <!--T:35--> |
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'''Accepted selection:''' any line/curve + any line/curve + any point |
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</translate> |
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[[Image:Sketcher_ConsraintAngle_mode4.png|400px]] |
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Revision as of 18:22, 8 March 2024
Sketcher ConstrainAngle |
Menu location |
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Sketch → Sketcher constraints → Constrain angle |
Workbenches |
Sketcher |
Default shortcut |
K A |
Introduced in version |
- |
See also |
Sketcher Constrain distance, Sketcher Constraint Perpendicular |
Description
The Sketcher ConstrainAngle tool is a datum constraint intended to fix angles in a sketch. It is capable of setting slopes of individual lines, angles between lines, angles of intersections of curves, and angle spans of circular arcs. Lines are treated as infinite, and arcs are treated as full circles/ellipses.
Usage
See also: Drawing aids.
Continue mode
- Make sure there is no selection.
- There are several ways to invoke the tool:
- introduced in version 0.22: 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 0.22: Right-click in the 3D view and select the Dimension → Constrain angle option from the context menu.
- Use the keyboard shortcut: K then A.
- introduced in version 0.22: If the Dimensioning constraints preference is set to
- The cursor changes to a white 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 driving constraint is created, and the Ask for value after creating a dimensional constraint preference is selected (default):
- A dialog opens to edit the constraint value.
- Press the OK button to confirm.
- A constraint is added.
- Optionally keep creating constraints.
- To finish, right-click or press Esc, or start another geometry or constraint creation tool.
Once-only mode
- Do one of the following:
- Select a single line.
- Select a single arc.
- Select two lines.
- Select a point and two edges (in any order).
- Invoke the tool as explained above.
- Edit and/or confirm the constraint value as explained above.
- A constraint is added.
Examples
Single line
The constraint sets the polar angle of line's direction. It is the angle between the line and X axis of the sketch.
Single circular arc
In this mode, the constraint fixes angular span of a circular arc.
Between two lines
In this mode, the constraint sets the angle between two lines. It is not required that the lines intersect.
Between two edges at point (angle-via-point)
In this mode, angle between two curves is constrained at the point of their intersection. The intersection point can be on curves' extensions. The point should be specified explicitly, since curves typically intersect in more than one point.
For the constraint to work correctly, the point must be on both curves. So, as the constraint is invoked, the point will be automatically constrained onto both curves (helper constraints will be added, if necessary), and the angle between curves will be constrained at the point. These helper constraints are plain regular constraints. They can be added manually, or deleted. There are no helper constraints on the example picture above, because the point selected is already the intersection of curves.
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 objectiline, iline1, iline2
are integers specifying the lines by their ordinal numbers inSketch
.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
andpointpos
inAngleViaPoint
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.
- General: Create sketch, Edit sketch, Map sketch to face, Reorient sketch, Validate sketch, Merge sketches, Mirror sketch, Leave sketch, View sketch, View section, Toggle grid, Toggle snap, Configure rendering order, Stop operation
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- Dimensional constraints: Lock, Horizontal distance, Vertical distance, Distance, Radius or weight, Diameter, Auto radius/diameter, Angle, Refraction (Snell's law)
- Constraint tools: Toggle driving/reference constraint, Activate/deactivate constraint
- Sketcher tools: Select unconstrained DoF, Select associated constraints, Select associated geometry, Select redundant constraints, Select conflicting constraints, Show/hide internal geometry, Select origin, Select horizontal axis, Select vertical axis, Symmetry, Clone, Copy, Move, Rectangular array, Remove axes alignment, Delete all geometry, Delete all constraints
- Sketcher B-spline tools: Show/hide B-spline degree, Show/hide B-spline control polygon, Show/hide B-spline curvature comb, Show/hide B-spline knot multiplicity, Show/hide B-spline control point weight, Convert geometry to B-spline, Increase B-spline degree, Decrease B-spline degree, Increase knot multiplicity, Decrease knot multiplicity, Insert knot, Join curves
- Sketcher virtual space: Switch virtual space
- Additional: Sketcher Dialog, Preferences, Sketcher scripting
- Getting started
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