DETERMINACION DE PRIORIDADES
128 Determinantes Relacionados a la Oferta del Sistema de Salud
Many PDMS elements have a Position attribute, e.g. SITE, ZONE, EQUI, SUBE, STRU, PANE, Primitives, etc.
Positions in PDMS are expressed in terms of 3D co-ordinates, i.e. X, Y and Z. As PDMS assigns cardinal directions to these three axes, i.e. X is East, Y is North and Z is Up, positions are often expressed in terms E, N, U rather than X,Y,Z.
The Position attribute gives the elements position with respect to its owner, however, where the elements owner does not have a Position attribute, the position is given with respect to its owner’s owner. For example, a PANE is owned by a FRMW, however, a FRMW does not have a Position attribute; therefore, the PANE’s position is given with respect to the FRMW’s owner, a STRU, which does have a Position attribute.
Positions may be queried with respect to any other element that has a Position attribute by entering Q POS WRT <element name> or <element type> in the Command Window. For example, Q POS WRT /E1301
will give the position with respect to the origin of element /E1301 or Q POS WRT SITE will give the position with respect to the elements owning Site.
Frequently the position is required with respect to the World origin. Entering Q POS WRT /* will give this position.
Forms that create or modify elements often enable the position to be expressed with respect to other elements although the Position attribute always gives the value with respect to its owner, no matter how it was derived. In other cases forms only allow positions to be expressed with respect to their owner or the World.
www.aveva.com
6.2.1 The Positioning Control ToolbarIn EDG mode positions may be picked using other elements in the graphics display. Whenever this is applicable the Positioning Control toolbar is activated.
The Positioning Control toolbar enables the user to specify how cursor picks are interpreted as positions, using a combination of Pick Type and Pick Method.
L
It must be emphasised that the Positioning Control toolbar is only active when applications are inEvent Driven Graphics (EDG) mode.
6.2.1.1 Pick Type
The Pick Type pull-down offers the following options: • Any – uses any appropriate pick type.
• Element - picking is restricted to elements.
• Aid - picking is restricted to 3D Aid Constructs, including User Grid Systems.
• Pline - picking is restricted to structural Plines.
• Ppoint - picking is restricted to Ppoints or panel vertices.
• Screen - enables pick anywhere in the graphical view, which identifies two co-ordinates, the third co- ordinate being taken from the current Working Plane or normal to the view direction if there is no active Working Plane.
• Graphics – enables edge, surface and corner picks on any graphical element displayed in the graphical view.
6.2.1.2 Pick Method
The Positioning Control Method determines how the position will be derived from subsequent cursor picks.
The Pick Method pull-down offers the following options:
• Snap - Selects the snap point nearest to the cursor pick point. This means nearest start, end or other valid snap point on a SCTN.
AVEVA Plant (12 Series) PDMS Foundations TM-1001
www.aveva.com
• Distance -applies the offset value entered in the textbox adjacent to the Method pull-down. For examplea +ve value of 500derives a point 500 mm from the nearest snap point, measured towards the cursor
position, whereas, a –ve value of 500 derives a point 500 mm from the nearest snap point, measured
away from the cursor position.
• Mid-Point - derives the mid-point between two snap points along a linear item.
• Fraction - subdivides the distance between two snap points into a specified number of parts, entered in the textbox adjacent to Method pull-down. The derived position is the fractional position closest to the cursor pick.
• Proportion - derives the point whose proportional position between two snap points has been entered in the textbox adjacent to the Method pull-down. For example, a value of 0.25 gives a point 25% along the line joining the first snap point to the second snap point.
www.aveva.com
• Intersect – requires two picked lines (any directional items) or three planes and then derives theirintersection point.
• Cursor - places the derived point exactly where the cursor picks on the element. 6.2.2 Positioning Explicitly
Elements may be positioned explicitly, i.e. at the specified co-ordinates, using the various methods. The Positioning Control Toolbar has an Explicit Position button that displays the Explicit Position form:
An explicit position may be defined by entering values in the appropriate text boxes. As the text boxes only allow E, N and U values, for a position requiring, say, a West ordinate, a negative value would need to be entered in the E textbox.
The Design applications have an Explicit Position form, displayed by selecting Position>Explicitly (AT)…
from the main menu, via which the explicit position of an element may be defined.
The explicit position is defined by entering the required co-ordinates in the East/West, North/South and Up/Down textboxes, using the option buttons to set the appropriate direction in each case. If required, the Lock checkboxes may be used to fix the current co- ordinate along any axis.
The wrt (with respect to) textbox can be used to identify an element whose coordinate system is to be used for the Position data.
The Datum pull-down allows identification of the specific point on the element to which the position is to apply. The options for this pull- down vary depending on the selected element type.
The Select form menu options change the focus of the form, i.e. if a new CE is selected in Design Explorer, selecting the CE or Owner option displays the position of the CE or its owner, respectively, on the form.
The Pick and Pick Owner options prompts for an item to be picked and the selected item or its owner’s position, respectively, is displayed on the form.
L
Picking a position with the Positioning Control Toolbar in conjunction with the Explicit Position formAVEVA Plant (12 Series) PDMS Foundations TM-1001
www.aveva.com
When the form is opened or a new element selected, a ‘bounding box’ is placed around the extremities of the element to be moved, whether it is displayed or not. On entering new coordinates the bounding box is moved to the new location as a preview of the changes to be made. An axis aid is also displayed at the Datum point showing the cardinal directions.Clicking the Apply button on the form moves the element to the specified location. Clicking the Dismiss
button removes the bounding box and dismisses the form.
An explicit position may also be specified by using the AT syntax in the Command Window, e.g. AT E 5000 N 4500 U 2975 positions the element at specified coordinates.
6.2.3 Positioning Relatively
Elements may be positioned relatively, i.e. from their current position by a specified direction and distance, using different methods.
The Design applications have a Position By form, displayed by selecting Position>Relatively (BY)… from the main menu, via which an element may be moved relatively from its current position.
The offsets from the current position are defined by entering the required distances in the East/West, North/South and Up/Down textboxes, using the option buttons to set the appropriate direction in each case. If required, the Lock checkboxes may be used to fix the current position along any axis. The default offsets 0, 0, 0 represent the current position of the element.
The wrt (with respect to) textbox can be used to identify an element whose coordinate system is to be used for the Position data.
A different element may be selected for relative position by using the pull-down at the top of the form: The options list has the following choices:
www.aveva.com
• Pick – this option allows an element to be selected from a graphical view.• List – this option uses the elements in the current list. All elements in the list are re- positioned.
When the form is first opened, or a new selection made, an axes aid, showing the cardinal directions, is placed at the elements current position. When offsets are entered aid lines show the offsets, true distance and the new position.
Clicking the Apply button on the form moves the element(s) by the specified offsets. The aids are still displayed showing the new position id the Apply button was clicked again. Clicking the Dismiss button removes the aids and dismisses the form.
L
In addition to these methods of positioning elements, the Design applications have other functionalityto move, drag and perform planar moves affect an elements position. Similarly, the Model Editor enables elements to be moved graphically.
Relative positioning may also be specified by using the BY syntax in the Command Window, e.g. BY E 1500 N 2200 U 945 moves the element by the specified offsets in the specified direction. Only one or two offsets and directions need to be specified, e.g. BY D 1250 or BY W 750 D 1000.