Klayout

* Editing capabilities. "klayout" in it's basic form still operates as pure
viewer. However, a mode is available that enables editing capabilities.
See Editor mode quickstart manual for a more detailed description
* Some RBA extensions: i.e. conversion from "double" type polygons to "integer"
type ones.
* A default layer table can be configured in the "Application" tab of the
setup dialog. This table will be loaded whenever a layout is opened or
created.
* A installer for Windows is provided now.
* Properties are supported on instances now as well.
* Code is compatible with gcc 4.3.0 now.
* Enhanced compatibility with SunStudio 11 compiler (in particular in RBA).
* Various bug fixes (i.e. in GDS reader and OASIS writer).

* Several RBA extensions: i.e. alternative methods replacing different 'new'
variants by one 'new'. Markers now can be filled.
* Fixes for the bugs mentioned in the issues list.
* OASIS and GDS writing capabilities. Menu functions are provided to save a
layout and single cells as well as RBA extensions that allow to write a
layout. See Saving a layout or parts of it for details.
* Rulers and markers are drawn with a thin halo in background color to
enhance their visibility. This can be switched off in the setup dialog if
this is not desired. The screenshots illustrate the differences.

* A couple of RBA extensions: API's for shape properties, rulers and geometry
selections.
* A bugfix for the OASIS reader (sometimes crashing the reader on
CBLOCK-compressed input)
* A function to descend into a cell in the hierarchy but keeping the context,
which is shown in dimmed colors. This function can be found in the "Display"
menu and is called "Descend". To use this function, select a shape or instance
inside the cell into which to descend. "Descend" then enters the next cell
along the path that leads to the selected shape or instance.
* The mouse wheel can be used to zoom in and out.
* Shift+right mouse button pressed now allows to "drag" layout in a "Google maps" fashion.
* Copy & paste now is available for layers as well.
* A ruby console is provided where ruby commands can be executed interactively.
* The way how the selection is displayed can be configured now (color, line width
and vertex size).
* The interrupt signal now is enabled again even if Ruby is activated (Ctrl+C
now works again).

* Support for arbitrary angles on cell instances.
* A bugfix for the OASIS reader (CTRAPEZOIDS have not been read in some
cases). The OASIS reader now uses shape arrays to achieve are smaller
memory footprint in some cases.
* Multiple transformations are now allowed on layer source expressions
(see Transforming views and property selectors for a detailed description).
* Rulers now are configurable to a large extent. Multiple ruler templates may
be defined from which a certain ruler type can be chosen. Some of the new
ruler styles are no longer "rulers" but rather "annotations". See Ruler
properties for a description of that feature.
* Last, but not least: KLayout now can be scripted to some extend using Ruby
as the scripting language. For more information about this feature, see
RBA introduction.

* Some bugs were fixed in the OASIS implementation. CBLOCK compression now
is supported. Forward cell name references (numerical ID is used before
being associated with a string) are supported as now. File global properties
are now read correctly. A bug reading certain CTRAPEZOID objects was fixed.
(Still, forward references are not allowed for text/property strings or
property names).
* A layout properties dialog has been added that shows basic properties of
the layout such as top cells, layers and others.
* The "Select Cell" dialog has been enhanced with the capability to hide
and show multiple cells in the cell list.
* A "zoom fit" mouse gesture was implemented: moving the mouse up and right
with the right mouse button pressed now fits the current cell into the window.
Moving up and left still zooms out.
* A bug in the GDS2 reader, dropping polygon points in rare cases, was fixed

* The build script has been enhanced and supports Qt installations with
different locations for binaries, libraries and headers. See the Build
section for details about this.
* OASIS files can be read as well now. The reader automatically determines
the kind of file. OASIS layer names are supported. Due to the complexity
of the OASIS specification, or more precisely the effort required to test
a reader for meeting the specification, OASIS support currently is regarded
to be in "beta" state.
* Layers can now be organized hierarchically. Layers can be grouped which
allows to control visibility and other properties for the group as a whole.
Layers can be removed from the layer view list or new layer views can be created.
* The layout can be transformed (rotated, shifted, mirrored) now. This
transformation is specified in the layer panel as a part of the layer
source specification. An optional transformation can be applied per layer
or layer group. This way for example, different layouts can be aligned
over each other.
* Shape properties now are supported. Each shape may carry optional
properties that are read from GDS or OASIS files. A property selector
can be applied per layer view, so that a layer only shows these shapes
that match the given property selection.
* As an experimental feature, the inverse layout tree can be visualised
by allowing the minimum hierarchy level to go into the negative range.
The effect of this is, that a cell is shown in the context of all of
it's direct parents, if the first hierarchy level is set to -1. If set
to -2, the cell is shown in the context of all of it's parents and
grandparents and so on. Since there is no particular optimization for
this feature, performance may be poor, if a cell must be painted in a
huge number of contexts. In addition, the context displayed does not
participate in selection or ruler snapping.