Sketcher CreateEllipseBy3Points: Difference between revisions
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{{Docnav |
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|[[Sketcher_CreateEllipseByCenter|Ellipse by center]] |
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|[[Sketcher_CreateArcOfEllipse|Arc of ellipse]] |
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|[[Sketcher_Workbench|Sketcher]] |
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|IconL=Sketcher_CreateEllipseByCenter.svg |
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|IconR=Sketcher_CreateArcOfEllipse.svg |
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|IconC=Workbench_Sketcher.svg |
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{{GuiCommand |
{{GuiCommand |
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|Name=Sketcher |
|Name=Sketcher CreateEllipseBy3Points |
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|MenuLocation=Sketch → Sketcher geometries → Create ellipse by 3 points |
|MenuLocation=Sketch → Sketcher geometries → Create ellipse by 3 points |
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|Shortcut={{KEY|G}} {{KEY|3}} {{KEY|E}} |
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|Version=0.15 |
|Version=0.15 |
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|SeeAlso=[[Sketcher_CreateEllipseByCenter|Sketcher |
|SeeAlso=[[Sketcher_CreateEllipseByCenter|Sketcher CreateEllipseByCenter]] |
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}} |
}} |
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==Description== <!--T:2--> |
==Description== <!--T:2--> |
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This tool draws an ellipse by picking three points : (1) the Periapsis ( First crossing of longer diameter with ellipse), (2) the apoapsis ( Second crossing of longer diameter with ellipse), (3) one point on a side of the longer diameter (a) defining the minor radius (b). (c) is the resulting center and (f) are the focal points. |
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The [[Image:Sketcher_CreateEllipseBy3Points.svg|24px]] [[Sketcher_CreateEllipseBy3Points|Sketcher CreateEllipseBy3Points]] tool creates an ellipse by the endpoints of one of its axes and a point along the ellipse. {{Version|1.0}}: This is the same tool as [[Sketcher_CreateEllipseByCenter|Sketcher CreateEllipseByCenter]] but with a different initial mode. |
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When starting the tool, the mouse pointer changes to a white cross with a red ellipse icon. |
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[[Image:Ellipse_3Point.png|none]] |
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''The sequence of clicks is indicated by yellow arrows with numbers. 1 is the periapsis, 2 is the apoapsis, 3 is the defining point for minor diameter, green lines are major and minor diameters. Blue lines are random construction lines just for illustration purpose.'' |
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==Usage== <!--T:4--> |
==Usage== <!--T:4--> |
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* Invoke the command by clicking a toolbar button, picking the menu item, or by using keyboard shortcut (needs to be assigned first in [[Interface Customization]]). |
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* First click in 3D view sets a point that defines the crossing of the major diameter with the ellipse ( periapsis ). Second click in 3D view sets a point that defines the crossing of the major diameter with the ellipse opposite to the center point( apoapsis ). Third click sets a point on the ellipsis defining the minor radius. |
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See also: [[Sketcher_Workbench#Drawing_aids|Drawing aids]]. |
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* After the third click, the ellipse is created, together with a set of construction geometry aligned to it (major diameter, minor diameter, two foci). The construction geometry can be manually deleted if not needed, and recreated later. See [[Sketcher ConstrainInternalAlignment|Internal Alignment Constraint]] and [[Sketcher RestoreInternalAlignmentGeometry|Sketcher Show Hide Internal Geometry]]. |
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* Pressing {{KEY|ESC}} or clicking the right mouse button cancels the function. |
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# There are several ways to invoke the tool: |
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* Major and minor axes of ellipses are strict and cannot be swapped by resizing the ellipse. This is a consequence of the solver parametrization used (center (x,y), focus1 (x,y) and minor radius length (b)) and the same strict behavior of OpenCascade. The ellipse must be rotated to swap the axes. |
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#* Press the {{Button|[[Image:Sketcher_CreateEllipseBy3Points.svg|16px]] [[Sketcher_CreateEllipseBy3Points|Ellipse by axis endpoints, rim point]]}} button. |
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* Ellipse can function as a circle when its major and minor diameter lines are deleted, and one of the foci is constrained to coincide with the center. But radius constraint won't work on such a circle. |
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#* Select the {{MenuCommand|Sketcher → Sketcher geometries → [[Image:Sketcher_CreateEllipseBy3Points.svg|16px]] Create ellipse by 3 points}} option from the menu. |
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* Moving the ellipse by edge is the same as moving ellipse's center. |
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#* Use the keyboard shortcut: {{KEY|G}} then {{KEY|3}}, then {{KEY|E}}. |
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# For further steps see [[Sketcher_CreateEllipseByCenter#Usage|Sketcher CreateEllipseByCenter]]. |
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==Notes== <!--T:18--> |
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See [[Sketcher_CreateEllipseByCenter#Notes|Sketcher CreateEllipseByCenter]]. |
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{{Docnav |
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|[[Sketcher_CreateEllipseByCenter|Ellipse by center]] |
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|[[Sketcher_CreateArcOfEllipse|Arc of ellipse]] |
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|[[Sketcher_Workbench|Sketcher]] |
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|IconL=Sketcher_CreateEllipseByCenter.svg |
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|IconR=Sketcher_CreateArcOfEllipse.svg |
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|IconC=Workbench_Sketcher.svg |
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Revision as of 10:57, 23 April 2024
Sketcher CreateEllipseBy3Points |
Menu location |
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Sketch → Sketcher geometries → Create ellipse by 3 points |
Workbenches |
Sketcher |
Default shortcut |
G 3 E |
Introduced in version |
0.15 |
See also |
Sketcher CreateEllipseByCenter |
Description
The Sketcher CreateEllipseBy3Points tool creates an ellipse by the endpoints of one of its axes and a point along the ellipse. introduced in version 1.0: This is the same tool as Sketcher CreateEllipseByCenter but with a different initial mode.
Usage
See also: Drawing aids.
- There are several ways to invoke the tool:
- Press the Ellipse by axis endpoints, rim point button.
- Select the Sketcher → Sketcher geometries → Create ellipse by 3 points option from the menu.
- Use the keyboard shortcut: G then 3, then E.
- For further steps see Sketcher CreateEllipseByCenter.
Notes
See Sketcher CreateEllipseByCenter.
Sketcher
- 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
- Sketcher geometries: Point, Line, Arc, Arc by 3 points, Circle, Circle by 3 points, Ellipse, Ellipse by 3 points, Arc of ellipse, Arc of hyperbola, Arc of parabola, B-spline by control points, Periodic B-spline by control points, B-spline by knots, Periodic B-spline by knots, Polyline, Rectangle, Centered rectangle, Rounded rectangle, Triangle, Square, Pentagon, Hexagon, Heptagon, Octagon, Regular polygon, Slot, Fillet, Corner-preserving fillet, Trim, Extend, Split, External geometry, Carbon copy, Toggle construction geometry
- Sketcher constraints:
- Geometric constraints: Coincident, Point on object, Vertical, Horizontal, Parallel, Perpendicular, Tangent, Equal, Symmetric, Block
- 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
User documentation
- Getting started
- Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
- Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate
- Help: Tutorials, Video tutorials
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