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Python module for creating/importing/merging GDSII files.

Project Description


[![Boost Software License - Version 1.0](]( [![Documentation Status](](

Gdspy is a Python module for creating/importing/merging GDSII stream files. It includes key libraries for creating complex CAD layouts:

  • Boolean operations on polygons (AND, OR, NOT, XOR) based on clipping algorithm
  • Polygon offset (inward and outward rescaling of polygons)
  • Efficient point-in-polygon solutions for large array sets

Gdspy also includes a simple layout viewer.

Typical applications of gdspy are in the fields of electronic chip design, planar lightwave circuit design, and mechanical engineering.

## Installation

### Dependencies:

### Linux / OS X

Option 1: using [pip](

`sh pip install gdspy `

Option 2: download the source from [github]( and build/install with:

`sh python install `

### Windows

The preferred option is to install pre-compiled binaries from [here]( for 32 and 64-bit systems.

Installation via pip and building from source as above are also possible, but an appropriate [build environment]( is required for compilation of the C extension modules.

## Usage

The file []( in the example folder is a sample script to show the features provided by this module.

The complete module reference can be built from the sources in the docs folder with [Sphinx]( It is also available [on-line](

## Support

Help support gdspy development by [donating via PayPal](

## History of changes

### Version 1.1.2 (Mar 19, 2017) * Update clipper library to 6.4.2 to fix bugs introduced in the last update. * License change to Boost Software License v1.0.

### Version 1.1.1 (Jan 27, 2017) * Patch to fix installation issue (missing README file in zip).

### Version 1.1 (Jan 20, 2017) * Introduction of GdsLibrary to allow user to work with multiple library simultaneously. * Deprecated GdsImport in favor of GdsLibrary. * Renamed gds_print to write_gds and GdsPrint to GdsWriter. * Development changed to Python 3 (Python 2 supported via [python-future]( * Added photonics example. * Added test suite. * Clipper library updated to last version. * Fixed inside function sometimes reversing the order of the output. * Fixed rounding error in fast_boolean. * Fixed argument deep_copy being inverted in Cell.copy. * Bug fixes introduced by numpy (thanks to Adam McCaughan for the contribution).

### Version 1.0 (Sep 11, 2016) * Changed to “new style” classes (thanks to Adam McCaughan for the contribution). * Added a per-point radius specification for Polygon.fillet (thanks to Adam McCaughan for the contribution). * Added inside fucntion to perform point-in-polygon tests (thanks to @okianus for the contribution). * Moved from distutils to setuptools for better Windows support.

### Version 0.9 (Jul 17, 2016) * Added option to join polygons before applying an offset. * Added a translate method to geometric entities (thanks John Bell for the commit). * Bug fixes.

### Version 0.8.1 (May 6, 2016) * New fast_boolean function based on the [Clipper]( library with much better performance than the old boolean. * Changed offset signature to also use the [Clipper]( library (this change breaks compatibility with previous versions). * Bug fix for error when importing some labels from GDSII files.

### Version 0.7.1 (June 26, 2015) * Rebased to GitHub. * Changed source structure and documentation.

### Version 0.7 (June 12, 2015) * New feature: offset function. * New GdsPrint class for incremental GDSII creation (thanks to Jack Sankey for the contribution).

### Version 0.6 (March 31, 2014) * Default number of points for Round, Path.arc, and Path.turn changed to resolution of 0.01 drawing units. * Path.parametric accepts callable final_distance and final_width for non-linear tapering. * Added argument ends to PolyPath. * Added (limited) support for PATHTYPE in GdsImport. * A warning is issued when a Path curve has width larger than twice its radius (self-intersecting polygon). * Added a random offset to the patterns in LayoutViewer. * LayoutViewer shows cell labels for referenced cells. * get_polygons returns (referenced) cell name if depth < 1 and by_spec is True. * Bug fix in get_bounding_box when empty cells are referenced. * Bug fixes in GdsImport and many speed improvements in bounding box calculations (thanks to Gene Hilton for the patch).

### Version 0.5 (October 30, 2013) - NOT COMPATIBLE WITH PREVIOUS VERSIONS * Major LayoutViewer improvements (not backwards compatible). * The layer argument has been repositioned in the argument list in all functions (not backwards compatible). * Renamed argument by_layer to by_spec (not backwards compatible). * Error is raised for polygons with more vertices than possible in the GDSII format. * Removed the global state variable for default datatype. * Added get_datatypes to Cell. * Added argument single_datatype to Cell.flatten. * Removed gds_image and dropped the optional PIL dependency.

### Version 0.4.1 (June 5, 2013) * Added argument axis_offset to Path.segment allowing creation of asymmetric tapers. * Added missing argument x_reflection to Label. * Created a global state variable to override the default datatype. * Bug fix in CellArray.get_bounding_box (thanks to George McLean for the fix)

### Version 0.4 (October 25, 2012) * Cell.get_bounding_box returns None for empty cells. * Added a cache for bounding boxes for faster computation, especially for references. * Added support for text elements with Label class. * Improved the emission of warnings. * Added a tolerance parameter to boolean. * Added better print descriptions to classes. * Bug fixes in boolean involving results with multiple holes.

### Version 0.3.1 (May 24, 2012) * Bug fix in the fracture method for PolygonSet.

### Version 0.3a (May 03, 2012) * Bug fix in the fracture method for Polygon and PolygonSet.

### Version 0.3 (April 25, 2012) * Support for Python 3.2 and 2.7 * Further improvements to the boolean function via caching. * Added methods get_bounding_box and get_layers to Cell. * Added method top_level to GdsImport. * Added support for importing GDSII path elements. * Added an argument to control the verbosity of the import function. * Layer -1 (referenced cells) sent to the bottom of the layer list by default in LayoutViewer * The text and background of the layer list in LayoutViewer now reflect the colors of the outlines and canvas backgroung. * Changed default background color in LayoutViewer * Thanks to Gene Hilton for the contributions!

### Version 0.2.9 (December 14, 2011) * Attribute Cell.cell_list changed to Cell.cell_dict. * Changed the signature of the operation in boolean. * Order of cells passed to LayoutViewer is now respected in the GUI. * Complete re-implementation of the boolean function as a C extension for improved performance. * Removed precision argument in boolean. It is fixed at 1e-13 for merging close points, otherwise machine precision is used. * gds_image now accepts cell names as input. * Added optional argument depth to get_polygons * Added option to convert layers and datatypes in imported GDSII cells. * Argument exclude_layers from LayoutViewer changed to hidden_layers and behavior changed accordingly. * Shift + Right-clicking on a layer the layer-list of LayoutVIewer hides/unhides all other layers. * New buttons to zoom in and out in LayoutViewer. * Referenced cells below a configurable depth are now represented by theirs bounding boxes in LayoutViewer.

### Version 0.2.8 (June 21, 2011) * GDSII file import * GDSII output automatically include required referenced cells. * gds_print also accepts file name as input. * Outlines are visible by default in LayoutViewer. * Added background color option in LayoutViewer. * Right-clicking on the layer list hides/unhides the target layer in LayoutViewer. * Cell.cell_list is now a dictionary indexed by name, instead of a list. * Added option to exclude created cells from the global list of cells kept in Cell.cell_list. * CellReference and CellArray accept name of cells as input. * Submodules lost their own __version__.

### Version 0.2.7 (April 2, 2011) * Bug fixed in the boolean, which affected the way polygons with more vertices then the maximum were fractured. * gds_image accepts an extra color argument for the image background. * Screenshots takes from LayoutViewer have the same background color as the viewer. * The functions boolean and slice now also accept CellReference and CellArray as input. * Added the method fracture to Polygon and PolygonSet to automatically slice polygons into parts with a predefined maximal number of vertices. * Added the method fillet to Polygon and PolygonSet to round corners of polygons.

### Version 0.2.6 (February 28, 2011) * When saving a GDSII file, ValueError is raised if cell names are duplicated. * Save screenshot from LayoutViewer. * gds_image accepts cells, instead of lists. * Outlines supported by gds_image. * LayoutViewer stores bounding box information for all visited layers to save rendering time.

### Version 0.2.5 (December 10, 2010) * Empty cells no longer break the LayoutViewer. * Removed the gds_view function, superseded by the LayoutViewer, along with all dependencies to matplotlib. * Fixed a bug in boolean which affected polygons with series of collinear vertices. * Added a function to slice polygons along straight lines parallel to an axis.

### Version 0.2.4 (September 04, 2010) * Added shortcut to Extents in LayoutViewer: Home or a keys. * PolygonSet is the new base class for Round, which might bring some incompatibility issues with older scripts. * Round elements, PolyPath, L1Path, and Path arc, turn and parametric sections are now automatically fractured into pieces defined by a maximal number of points. * Default value for max_points in boolean changed to 199. * Removed the flag to disable the warning about polygons with more than 199 vertices. The warning is shown only for Polygon and PolygonSet. * Fixed a bug impeding parallel parametric paths to change their distance to each other.

### Version 0.2.3 (August 09, 2010) * Added the PolyPath class to easily create paths with sharp corners. * Allow None as item in the colors parameter of LayoutViewer to make layers invisible. * Added color outline mode to LayoutViewer (change outline color with the shift key pressed) * Increased the scroll region of the LayoutViewer canvas * Added a fast scroll mode: control + drag 2nd mouse button * Created a new sample script

### Version 0.2.2 (July 29, 2010) * Changed the cursor inside LayoutViewer to standard arrow. * Fixed bugs with the windows version of LayoutViewer (mouse wheel and ruler tool).

### Version 0.2.1 (July 29, 2010) * Bug fix: gds_image displays an error message instead of crashing when PIL is not found. * Added class LayoutViewer, which uses Tkinter (included in all Python distributions) to display the GDSII layout with better controls then the gds_view function. This eliminates the matplotlib requirement for the viewer functionality. * New layer colors extending layers 0 to 63.

### Version 0.2.0 (July 19, 2010) * Fixed a bug on the turn method of Path. * Fixed a bug on the boolean function that would give an error when not using Polygon or PolygonSet as input objects. * Added the method get_polygons to Cell, CellReference and CellArray. * Added a copy method to Cell. * Added a flatten method to Cell to remove references (or array references) to other cells. * Fracture boolean output polygons based on the number of vertices to respect the 199 GDSII limit.

### Version 0.1.9 (June 04, 2010) * Added L1Path class for Manhattan geometry (L1 norm) paths.

### Version 0.1.8 (May 10, 2010) * [![Documentation Status](]( the argument fill from gds_view and added a more flexible one: style. * Fixed a rounding error on the boolean operator affecting polygons with holes. * Added a rotate method to PolygonSet. * Added a warning when PolygonSet has more than 199 points * Added a flag to disable the warning about polygons with more than 199 points. * Added a turn method to Path, which is easier to use than arc. * Added a direction attribute to Path to keep the information used by the segment and turn methods.

### Version 0.1.7 (April 12, 2010) * New visualization option: save the geometry directly to an image file (lower memory use). * New functionality added: boolean operations on polygons (polygon clipping). * All classes were adapted to work with the boolean operations. * The attribute size in the initializer of class Text does not have a default value any longer. * The name of the argument format in the function gds_view was changed to fill (to avoid confusion with the built-in function format).

### Version 0.1.6 (December 15, 2009) * Sample script now include comments and creates an easier to understand GDSII example. * Improved floating point to integer rounding, which fixes the unit errors at the last digit of the precision in the GDSII file. * Fixed the font for character 5. * Added a flag to gds_view to avoid the automatic call to * In gds_view, if a layer number is greater than the number of formats defined, the formats are cycled.

### Version 0.1.5a (November 15, 2009) * Class Text correctly interprets \n and \t characters. * Better documentation format, using the Sphinx engine and the numpy format.

### Version 0.1.4 (October 5, 2009) * Class Text re-written with a different font with no overlaps and correct size.

### Version 0.1.3a (July 29 2009) * Fixed the function to_gds of class Rectangle.

### Version 0.1.3 (July 27, 2009) * Added the datatype field to all elements of the GDSII structure.

### Version 0.1.2 (July 11, 2009) * Added the gds_view function to display the GDSII structure using the matplotlib module. * Fixed a rotation bug in the CellArray class. * Module published under the GNU General Public License (GPL)

### Version 0.1.1 (May 12, 2009) * Added attribute cell_list to class Cell to hold a list of all Cell created. * Set the default argument cells=Cell.cell_list in the function gds_print. * Added member to calculate the area for each element type. * Added member to calculate the total area of a Cell or the area by layer. * Included the possibility of creating objects in user-defined units, not only nanometers.

### Version 0.1.0 (May 1, 2009) * Initial release.

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