Diario pedagógico n° 2

Having created a panel, the PLOO geometry may be modified by moving, adding and deleting vertices, edges and arcs. The vertices may also be expanded or contracted by a specified amount.

A group of vertices may be selected to be copied and inserted in a different part of the loop. Tools are provided to modify the group, e.g. move the origin or mirroring, before the group is inserted.

With the panel to be modified as the CE, selecting

Modify>Extrusion/Panel… from the main menu displays the Loop Vertex Editor form.

7.5.1 The Loop Vertex Editor form

As with many of the forms used in PDMS, the Loop Vertex Editor form fulfils several functions. The form is divided into several areas which are described in the following sections.

7.5.1.1 The Form Menu

The form menu contains the following options:

• Control>CE - When the form is displayed, the CE name is displayed beneath the form menu. Navigating to another panel and selecting this option makes the new CE the panel being edited by the form. The new CE name is displayed on the form.

• Control>Close - This option dismisses the form.

• Settings>Confirm - This is a toggle option. When set On the user must click the Create or Modify button at the bottom of the form to implement each creation or modification, depending which mode is current. When set Off, each creation or modification is implemented immediately.

• Settings>Confirm on delete – This is a toggle option. When set On, the user must confirm each deletion in order to complete the command. When set Off, deletions are implemented immediately. • Settings>Tag edges - This is a toggle option. When set On, each edge is tagged with the number of the

vertex at its start.

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reason (e.g. zero thickness).

• Settings>Free rotate - This is a toggle option. When set On this option allows groups of vertices to be oriented automatically when they are positioned relative, to say one edge, and are then moved to a different edge.

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vertices have the same position.

7.5.1.2 Mode Selection

The options in the Mode Selection area of the form enable the user to select a single vertex, an edge or a group of vertices to be modified or create a new vertex.

Select all – allows the user to select all vertices in the loop allowing them to be modified as a group. Select group to modify – allows the user to select any number of individual vertices so they can be modified as a group.

Select edge to modify – allows the user to pick an edge to be modified. The adjacent Edge gadget shows the current edge number (i.e. the number of the vertex at its start).

Select point to modify – allows the user to pick a vertex to be modified. The adjacent Vertex gadget shows the current vertex number

Create points – allows the user to create a new vertex, which will be allocated the next number in the sequence after the current vertex.

7.5.1.3 Vertex/Edge

The Vertex/Edge area of the form contains a Select button and a counter that shows the current vertex or edge, depending on the current mode. If the Select edge to modify button is clicked, the counter label will change to Edge and the counter will show the current edge.

The Select vertex/edge button allows the user pick a vertex in the 3D View. The adjacent Vertex/Edge counter shows the current vertex/edge number, which is also tagged in the 3D View. The user can navigate to a specific vertex/edge by typing its number in the textbox or by using the up/down arrows to step through the list.

7.5.1.4 Group Definition

When a group of vertices are modified, the buttons in the Group area of the form become active. These options let the user modify the current group in the following ways.

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loop. A Group may be the entire loop if the Select all button has been used.

Reverse group definition - reverses the group definition by implicitly renumbering all of the group vertices in the opposite sense (i.e., clockwise or anticlockwise). The origin moves to the other side of the ‘gap’. The sense of the current vertex sequence is shown by the aid arrow in the 3D View.

Move start forwards - moves the ‘open-side’ of the group, and the origin, one position ‘forwards’; that is, in the sense of the vertex numbering.

Move start backwards - moves the ‘open-side’ of the group, and the origin, one position backwards; that is, in the opposite sense to the vertex numbering.

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7.5.1.5 Group Expand/Contract

A Group may be expanded or contracted by the value specified in the textbox adjacent to the buttons. Expand group - expands the group area by moving each edge outwards, by the distance specified in the adjacent Expand/Contract textbox, normal to its own direction.

Contract group - contracts the group area by moving each edge inwards, by the distance specified in the adjacent Expand/Contract textbox, normal to its own direction.

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excessive expansion or contraction may lead to invalid loop geometry.

7.5.1.6 Line

If an edge is modified, the buttons in the Line area of the form become active. These options enable the user to modify the current edge in the following ways.

Extend start of line - moves the Start vertex along the edge direction to align it through a picked position. Use the Positioning Control options to pick the required position.

Alternatively, if a line is selected, the Start vertex will be moved along the edge direction until it intersects the picked line. These operations can change the edge length.

Extend end of line - moves the End vertex along the edge direction to align it through a picked position. Use the Positioning Control options to pick the required position.

Alternatively, if a line is selected, the End vertex will be moved along the edge direction until it intersects the picked line. These operations can change the edge length.

Make line parallel - moves the free vertex (lowercase tagging) around the reference vertex to align the edge with a picked line (another edge, a Pline etc.). This operation maintains the edge length.

7.5.1.7 Rotate

The options in the Rotate area of the form enable the user to rotate groups of vertices in the following ways. Rotate anti-clockwise - rotates the edge anticlockwise, through the rotation angle specified in the Angle textbox, about the reference end (uppercase tagging). This operation maintains the edge length.

Rotate clockwise - rotates the edge clockwise, through the rotation angle specified in the Angle textbox about the reference end (uppercase tagging). This operation maintains the edge length.

7.5.1.8 Modify

The options in the Modify area of the form enable the user to carry out the following operations on the current Group selection.

Insert selected – enables the user to move a vertex group by inserting it at a different position in the loop sequence. Use the Vertex selector to navigate to the required point in the

sequence; the group will be inserted after the current vertex.

Mirror – enables the user to move the current vertex, edge or group such that the new positions are derived by reflecting the original positions about a picked line (an edge, Pline, etc.).

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When this button is selected the Modify Arc form will be displayed and the Loop Vertex Editor form will become temporarily inactive.

7.5.1.9 Vertex/Edge/Group Coordinates

The bottom area of the Loop Vertex Editor form displays co-ordinate data about the current vertex, edge or group, depending on the Selection Mode, together with radius information where applicable.

For a vertex the X and Y (East and North) co-ordinates, with respect to the panel origin, are displayed. There is no Z co-ordinate as the panel loop is a 2D object. The Radius textbox allows the user to specify a radius to be applied to the loop at that vertex. This value is applied to the Fradius attribute of the vertex and may be positive or negative value.

A value of 0, the default, will produce a ‘sharp’ corner at the vertex.

A positive value will produce a convex radius at the vertex.

A negative value will produce a concave radius at the vertex.

For an edge the co-ordinates are given for the start or end of the edge. An aid is displayed in the 3D View showing which is the start and which is the end. By default the START of the edge, i.e. the vertex with the lowest number that forms the edge, is shown in uppercase and the end shown in lowercase. This means that any modifications made to the currently displayed co-ordinates will affect the START only.

The options list in this area of the form becomes active when an edge is selected and enables various options of how the edge is to behave to be selected.

Selecting the End option displays the END of the edge in uppercase and the start of the edge in lowercase. Modifications made will apply to the END of the edge only. It should be noted that modifying the length in either of these cases will move the edge start or end accordingly.

The Aligned option displays both the START and the END of the edge in uppercase. Generally the user will only be able to modify an orthogonal edge in a direction normal to the edge itself. Care should be taken when modifying a non-orthogonal edge as unexpected results may occur.

The Modify or Create button at the bottom of the form depend on the mode. In Modify mode clicking the button will change the current vertex or edge using the values in the X, Y, Radius or Length textboxes. In Create mode, i.e. when adding a new vertex, clicking the button will create a new vertex with the values displayed in the X, Y or Radius text-boxes.

7.5.2 Moving the Panel Origin

When creating a panel the Origin is placed at the first vertex by default and the X and Y co-ordinates of all other vertices in the panel relate to this position.

Selecting Position>Panel Origin from the main menu and selecting a different vertex when prompted enables the user to use a different vertex in the PLOO as the panel origin.

If the origin is redefined in this way, the coordinates of all vertices owned by the current panel loop are recalculated relative to the new origin such that their positions in the design model remain unchanged.

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7.5.3 Modifying Panel Thickness

Although the panel thickness is set during creation it can be modified at any time.

Make the panel to be modified the CE and select

Modify>Thickness… from the main menu to display the Panel Thickness form.

Entering a value in the textbox and clicking the Apply button modifies the panel thickness.

7.5.4 Modifying Panel Justification

Although the panel justification is set during panel creation it can be modified at any time.

Make the panel to be modified the CE and select

Modify>Justification… from the main menu. This displays the Set Justification form.

Selecting Bottom, Centre or Top from the Justification list and clicking the Apply button modifies the panel justification.

The in/out checkbox enables the user to set the direction relative to the plane used to justify the panel as shown in the following diagram.

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