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What's Good About Allegro PCB Editor Polygon Selection? Look at SPB16.3 and See!

Comments(4)Filed under: PCB design, SPB, Allegro PCB Editor, Allegro, PCB Editor, PCB, SPB 16.3, Allegro 16.3, layout, PCB Capture, SPB16.3, polygon

The Allegro PCB Editor allows selection of items by several means. In preselect mode, a single object or group of objects can be selected using a SHIFT left mouse button window select or by using a right mouse button Selection Set — Object browser. In the verb-noun mode, multiple items can be selected by windowing around the items to operate on, or by creating a temporary group of items to operate on. The window mechanism is conventional in that it requires a few steps in order to select multiple items. However, the window is orthogonal.

The Allegro PCB Editor SPB16.3 release now includes the ability to select elements by drawing a polygon around them. With this release, an enhanced windowing operation is available that permits a polygon selection window. Select-by-polygon is available in both the preselect and legacy mode. In verb-noun mode it's available on the right mouse button whenever a temp group is available. In preselect mode, it's available on the right mouse button as a submenu of the Selection Set menu (Selection Set — Select by Polygon).

When "Select by Polygon" is invoked, you are placed into a vertex entry mode. With each pick in the canvas, a line is drawn from the prior pick to the current pick. A dynamic line is displayed from the current cursor position to the initial pick maintaining a closed polygon at all times.

Read on for more details …


Using Polygon Select Example

A common request for polygon selection is related to via replacement; especially on components rotated 45 degrees.

1.    Select General Edit application mode
2.    Set the Super Filter to Via
3.    Invoke the polygon window selection. Right mouse button Selection Set — Select by Polygon

4.    Enter picks around the BGA. Use right mouse button "Done" to close the polygon

5.    Hover over a via and use the right mouse button Replace Padstack — Selected Instance(s)

6.    You will be presented with the "Select Padstack GUI" to chose a replacement padstack from.

Please share your thoughts on using this new Allegro PCB Editor feature!

Jerry "GenPart" Grzenia


By Dashtop on September 10, 2010
I couldn't open .brd file from  Allegro Free Physical Viewer version 16.3. Anything I need to do?

By Jerry GenPart on September 10, 2010
Hi "Dashtop",
Please contact our Cadence Customer Support team - they will be able to help you resolve this.

By kkw on April 2, 2013
Can we use that new feature in skill code?

By Jerry GenPart on April 3, 2013
Hi "kkw",
I believe you can,
Jerry G.

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