This function creates a set of polygons characterized by their vertices and places them by their reference onto a given set of 2D coordinates in a GDSII file. The connection between polygon type and position is accomplished through a map. In the GDS file the polygon references are united in a single cell which is situated on a given layer.
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Syntax |
Description |
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gdsaddmultipoly(f, cell_name, layer, polygon_vertices, x, y, map); |
Adds a cell with multiple types of polygons to a layer at specific positions. The polygon types corresponding to the different positions. |
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Parameter |
Type |
Description |
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f |
string |
A file handle that was previously opened with gdsopen. |
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cell_name |
string |
Name of the cell. |
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layer |
string or number |
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polygon_vertices |
cell |
Cell of polygon 2D vertex matrices. The number of cell entries corresponds to the number of different types of polygons. For a polygon with n vertices, the vertex matrix has the dimension nx2 where the first column represents x coordinate and the second column represents y coordinate, e.g., [x1,y1; x2,y2;…; xn,yn]. |
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x |
matrix |
x positions of the polygons |
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y |
matrix |
y positions of the polygons |
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map |
matrix |
Matrix of non-negative integers mapping the different polygon types to the given coordinates (x, y) where each entry corresponds to a polygon in the polygon_vertices cells in the order of occurrence e.g., for polygon vertices {p1, p2, p3} the number '2' corresponds to polygon p2. The map can either be a 1d-array where the length corresponds to the length of x and y. Or it can be a 2d-array of dimension K x L where K==length( x ) and L==length( y ). The special value "0" indicates that there is no structure at this position. |
Example
The following script command creates the polygons using an 1D-array map where length(map) = length(x) = length(y).
unit = 1e-6;
# Rhombus (identifier 1)
x1 = [-unit; 0; unit; 0];
y1 = [0; -unit; 0; unit];
v1 = [x1, y1];
# Square (identifier 2)
x2 = [-unit; -unit; unit; unit];
y2 = [unit; -unit; -unit; unit];
v2 = [x2, y2];
# Hexagon (identifier 3)
x3 = [-unit; -0.5*unit; 0.5*unit; unit; 0.5*unit; -0.5*unit];
y3 = [0; -unit; -unit; 0; unit; unit];
v3 = [x3, y3];
polygons = {v1, v2, v3};
x = [0, 4.4*unit, 6.6*unit, 8.8*unit];
y = [0, unit, -unit, 0];
# Map containing polygon identifiers:
map = [1, 2, 3, 2];
layer = 1;
f = gdsopen('polygons.gds');
gdsaddmultipoly(f, 'POLYGONS', layer, polygons, x, y, map);
gdsclose(f);
Alternatively, one can use a 2D-array map where length(map) = length(x)*length(y) for the same result.
x = linspace(0, 10*unit, 5);
y = linspace(2*unit, 0, 3);
# Map containing polygon identifiers:
map = [0, 0, 2, 0, 0;
1, 0, 0, 0, 2;
0, 0, 0, 3, 0];