Import some particular shape in to Cadence layout L

Hi EF

How about using "Edit->Advanced->Convert to Polygon" to convert your circle into a polygon?

Best regards
Quek

Hi Quek,

 Yes, it will turn the circle to a polgon with 20 sides. But the angle between the sides are not 45 degree or 90 degree so there are still some DRC problems.

 Thanks,

EF

Sounds like you would want to create a list of points from your Matlab result and then run dbCreatePolygon with that list of points. If you output the points as a list of coordinate pairs you could read the file using Skill and build your list, or simply create the coordinate pair list as a valid Skill file like this:

skillFileCreatedByMatlab.il:
pts = list(
x1:y1
x2:y2
x3:y3
...
xn:yn
)

load("skillFileCreatedByMatlab.il")
dbCreatePolygon(geGetEditCellView() list("metal1" "drawing") pts)

Derek

Hi Derek,

 The method works, thanks a lot for your code!

EF

Although I'm sure building the points in SKILL would be pretty straightforward - it seems a little excessive to have to do it in Matlab. But hey, pragmatism rules OK!

Andrew.

Hi Derek,

Currently I have a complicated shape in matlab generated matrix. And where it is metal I marked as '1'. And I marked SiO2 as '0'. So I have all the coordinate pair. But it is not marking the start point and ending points for the polygon. If I inport this file by the 'dbCreatePolygon' command it showed error. I would like to know for my situation, whether there is any method to successfully plot that shape quickly in Cadence layout. (such as other function, parameters or software)

Thank you.

Best,

Liu

In a simple word, I would like to draw many single points in the layout in one time. Or I can use nested loops. But I know nothing with the SKILL language. So I need the related functions. 

 Thank you.

Unfortunately, I don't completely understand what you are looking for. It sounds like you want to create polygons on different layers. Since I have no idea what your output looks like I don't know how to help.

The dbCreatePolygon is very straightforward. It takes three arguments: cellView id, layer, list of points

If you need to create polygons on various layers you'll need to call this command multiple times.

Derek

Hi Derek,

The pattern is indicated by a matrix (array) containing only 0 and 1. I want to import such matrix into the layout. (0 is blank, 1 is metal)

To use the function ' dbCreatePolygon'. I generate a list of points file. The list of points I have comes from this matrix where the number is '1'. It contains all the points inside the polygon not only the edges of the polygon.  

But 'dbCreatePolygon' creates the ploygon's edge and then fill the area inside it. (that is, 'dbCreatePolygon' cannot  draw a straight line or single point)

So is there any way to import such point matrix (array) into the layout?

Thank you.

Liu

Hi Derek,

 Liu is my friend and we are working on the same thing. What Liu basically means the matlab coordinate data are not listed in a good sequence for the command of dbCreatePolygon. For example, if we make a circle function in matlab and fit the coordinates of the points on the brim of circle to integer number, the data list generated from matlab will list the data with a stupid sequence, like X increasing or decreasing while Y is constant, then increase Y by 1 and then do the X increasing or decreasing again, and follow this loop. I basically want to say if I want Matlab to list the points long the brim of circle (precisely, not circle anymore) clockwise or anti-clockwise seems a little difficult.

 I am custom circuit designer and as I know if I want to draw a polygon I must click the vertices of the shape one by one with a sequence which can make it a close shape. And even skill language does the same thing. What Liu wants to know is, whether Cadence layout designer has a function which will not draw the points by sequence but stream in the matrix first then draw it without thinking which point is the first and which point is the second.

 In sum, as I discussed, I think the way "CreatePolygon" works determines it cannot draw a shape with the points in the list are not in sequence. Or is there any other commands can draw a shape in the layout, we don't know?

 Or, can Matlab generate a list of the cooridnates with a clockwise or anti-clockwise sequence, we need to figure out that?

 EF