TechDraw LengthDimension/pl

Opis
Narzędzie Wstaw wymiar długości dodaje wymiar liniowy do widoku. Wymiar może być odległością między dwoma wierzchołkami, długością jednej krawędzi lub odległością między 2 krawędziami. Wymiar będzie początkowo wyświetlał przewidywaną odległość (tj. jak pokazano na rysunku). Jeśli wymiar jest oparty na odniesieniach 3D, można go zmienić na rzeczywistą odległość 3D, ustawiając właściwość na.



Użycie

 * 1) Wybierz punkty lub krawędzie, które definiują pomiar. Geometria może być wybrana na rysunku lub w oknie widoku 3D.
 * 2) Istnieje kilka sposobów wywołania narzędzia:
 * 3) * Naciśnij przycisk.
 * 4) * Wybierz z menu opcję.
 * 5) Wymiar zostanie dodany do widoku. Wymiar można przeciągnąć do żądanej pozycji.
 * 6) W razie potrzeby dodaj tolerancje zgodnie z opisem na stronie Wymiarowanie geometrii i tolerancja.

Aby zmienić właściwości obiektu wymiaru, kliknij go dwukrotnie na rysunku lub w oknie widoku Drzewa. Spowoduje to otwarcie okna dialogowego wymiaru:



Okno dialogowe
Okno dialogowe wymiaru oferuje następujące ustawienia:



Tolerancja

 * W teorii dokładnie: Jeśli to pole jest zaznaczone, wymiar jest określony jako teoretycznie dokładny. W związku z tym nie powinien mieć żadnych tolerancji. Wymiar będzie wyświetlany z ramką wokół wartości: [[Image:TechDraw_theoretically_exact.png|100px]].


 * Tolerancja symetryczna: Jeśli to pole jest zaznaczone, tolerancja nadmierna i tolerancja niedostateczna są równe, a zanegowana wartość tolerancji nadmiernej jest używana jako tolerancja niedostateczna. Wyświetlany będzie symbol [[Image:TechDraw_equal-tolerance.png|100px]], w przeciwnym razie będzie to [[Image:TechDraw_Non-equal-tolerance.png|80px]].


 * Powyżej tolerancji:: Wielkość, o jaką wymiar może być większy.


 * Poniżej tolerancji:: Wielkość, o jaką wymiar może być mniejszy.

Formatowanie

 * Określenie formatu: sposób formatowania wartości wymiaru. Domyślnie specyfikatorem jest, gdzie to liczba miejsc dziesiętnych. Składnia formatowania znajduje się na stronie tej strony Wikipedii. Istnieje również dodatkowy format , który wyświetla określoną liczbę cyfr po separatorze dziesiętnym i usuwa końcowe zera. Na przykład  oznacza, że wypisane zostaną co najwyżej 2 cyfry po przecinku, a końcowe zera zostaną odcięte.


 * Arbitrary Text: If checked, the dimension is replaced by the content of the Format Specifier field.


 * OverTolerance Format Specifier: How the overtolerance value will be formatted. By default the specifier is where  is the number of decimals. For the formatting syntax see this Wikipedia page.


 * UnderTolerance Format Specifier: How the undertolerance value will be formatted. By default the specifier is where  is the number of decimals. For the formatting syntax see this Wikipedia page.


 * Arbitrary Tolerance Text: If checked, the tolerances are replaced by the content of the OverTolerance Format Specifier UnderTolerance Format Specifier fields.

Display Style

 * Flip Arrowheads: Flips the direction of the dimension line arrows. By default they are inside the dimension line/arc and point outwards.


 * Color: The color for lines and text.


 * Font Size: The dimension text size.


 * Drawing Style: The standard (and its style) according to which the dimension is drawn. See the property Standard And Style for details.

Lines

 * Override Angles: If checked, the usual angles for the dimension line and extension lines will be overridden by the specified values.


 * Dimension line angle: Override value for angle of dimension line with view X axis (in degrees).


 * Use default: Set dimension line angle to the usual angle.


 * Use selection: Set dimension line angle to match the angle of the selected edge (or 2 vertices) in the view.


 * Extension line angle: Override value for angle of extension lines with view X axis (in degrees).


 * Use default: Set extension line angle to the usual angle.


 * Use selection: Set extension line angle to match the angle of the selected edge (or 2 vertices) in the view.

Dane

 * : The 2D drawing View object(s) on which the measurement is based. Used if is.
 * : The 3D object(s) on which the measurement is based. Used if is.
 * : Length, radius, diameter, etc. Not normally manipulated by the end user.
 * : How the measurement is performed.
 * - based on 3D geometry.
 * - based on 2D drawing View geometry.


 * : Specifies a theoretically exact (or basic) dimension.
 * - a common dimension by default, possibly with tolerances.
 * - a theoretical value. As such, it shall not bear any tolerances. The dimension will be displayed by a frame around the value: [[Image:TechDraw_theoretically_exact.png|100px]]


 * : If over- and undertolerance are equal. Then the negated value of the overtolerance is used as undertolerance.
 * - the negated value of the is used as . The display will be [[Image:TechDraw_equal-tolerance.png|100px]]
 * - the is taken into account. The display will be [[Image:TechDraw_Non-equal-tolerance.png|80px]]


 * : The amount by which the dimension may be larger.
 * : The amount by which the dimension may be smaller.
 * : Marks whether the dimension represents a common or an inverted value.
 * - the ordinary value is used. For length it is a positive number, for angle the oblique value (0° - 180°).
 * - the inverted value is used. For length a negative number, for angle the reflex value (180° - 360°).


 * : Horizontal position of the dimension text relative to the View.
 * : Vertical position of the dimension text relative to the View.
 * : Locks the position of the dimension text when.
 * : Read only.
 * : Read only.
 * : Read only.
 * : Not used.


 * : How the dimension value will be formatted. See Formatting.
 * : Like, but for overtolerances.
 * : Like, but for undertolerances.
 * : Whether the dimension is replaced by the content of the Format Spec field.
 * - the content of the Format Spec is used to format the actual dimensional value.
 * - the content of the Format Spec will be displayed as text instead of the dimension value.


 * : Like, but for the tolerance.


 * : Whether the direction of dimension and extension lines is overridden.
 * - the directions are computed as usual.
 * - the directions are overridden by LineAngle and ExtensionAngle property values.


 * : angle of dimension line with view X axis (in degrees).
 * : angle of extension line(s) with view X axis (in degrees).

Widok

 * : Color for lines and text.
 * : By default the value inside the dimension line/arc means the arrows pointing outwards. If placed outside the dimension line/arc, the arrows point inwards the dimension line/arc.
 * - Let the direction of arrows to be selected automatically according to the rule above.
 * - Override the automatically chosen direction and force the opposite one.


 * : The name of the font to use for the dimension text.
 * : Dimension text size.
 * : Adjusts the gap between the dimension points and the start of the extension lines. The gap is this value times the line width.
 * : Adjusts the gap between the dimension points and the start of the extension lines. The gap is this value times the line width.
 * : Dimension line weight.
 * : Rather universal property specifying how much space the dimension drawing may take up:
 * - no lines or arrows are drawn, only the bare dimension value is displayed.
 * - for lengths and angles a single headed line connecting the dimensional value and the end point's virtual extension line is drawn. The extension line itself is not added.
 * Diameters are rendered following  extent, radii following   extent.
 * - for lengths and angles a double headed line (or arc) connecting the start and end point's virtual extension lines is drawn, though the extension lines themselves are not added.
 * Diameters are drawn with a minimal single headed line from dimensional value to the closest point on circle, radii as with  extent.
 * - for lengths and angles a single headed line connecting the dimensional value and the end point's extension line is drawn along with the extension line itself.
 * Diameters are drawn with a single headed line from the center to the closest point on circle, radii with a minimal single headed line from dimensional value to the closest arc point.
 * - the default value. For lengths and angles a double headed line (or arc) connecting the start and end point's extension lines is drawn, the extension lines themselves as well.
 * Diameters are drawn as double headed lines striking the center and connecting the closest and farthest points on the circle.
 * Radii are drawn as a single headed line from center to the closest arc point.
 * - Only diameters support this value, rendering them in a horizontal or vertical length-like way. Other dimension types are rendered as with  extent.


 * : Specifies the standard (and its style) according to which the dimension is drawn:
 * TechDraw_Dimension_standardization.png
 * - drawn according to the standard ISO 129-1, text is rotated to be parallel with the dimension line tangent.
 * - drawn in compliance with ISO 129-1, text is always horizontal, above the shortest possible reference line.
 * - drawn according to the standard ASME Y14.5M, text is horizontal, inserted in a break within the dimension line or arc.
 * - drawn in compliance with ASME Y14.5M, text is horizontal, short reference line is attached to one side's vertical center.

Ograniczenia
Dimension objects are vulnerable to the "topological naming problem". This means that if you modify the 3D geometry the faces and edges of the model may be renamed internally; if a dimension is attached to an edge that is then modified, the dimension may break. In general, it is not possible to keep the projected 2D dimensions synchronized with the actual 3D objects.

Therefore, it is recommended that dimensions be added when the 3D model is no longer being modified.

Workaround
If you want to keep a TechDraw view with dimensions that won't break, you need to dimension an object that won't change.
 * Select the object that you want to project, then switch to the [[Image:Workbench_Part.svg|24px]] Part Workbench and use . This will create a single object that is not parametric, that is, no longer editable.
 * Select this copy, then use TechDraw View, and add the desired dimensions.
 * If the original 3D model is modified, the modifications won't affect the simple copy, nor the dimensions in the TechDraw view.

See Landmark Dimensions for another approach to circumventing the topological naming issue.

Tworzenie skryptów
Zobacz również stronę: Dokumentacja API generowana automatycznie oraz Podstawy pisania skryptów dla FreeCAD.

Narzędzie Wymiar długości może być używane w makrodefinicjach i z konsoli Python za pomocą następujących funkcji:

Uwagi

 * Edge selection. Edges can be difficult to select. You can adjust the selection area for edges using the parameter "/Mod/TechDraw/General/EdgeFuzz" (see Std_DlgParameter). This is a dimension-less number. The default is 10.0. Values in the 20-30 range will make it noticeably easier to select edges. Large numbers will cause overlaps with other drawing elements.
 * Decimal places. Dimensions use the global decimal places setting by default. This can be changed via preferences or by changing the FormatSpec property.
 * Multiple objects. Views may contain multiple 3D objects as Source. Dimensions may be applied to geometry from any object(s) in the View (ex from Object1.Vertex0 to Object2.Vertex3).