Inkscape

Inkscape 0.48.2, showing a rectangle (selected with the select tool), an ellipse, a star and two text objects

Inkscape workflow is based around vector objects. Tools allow manipulating primitive vector shapes: simple ones like rectangles, ellipses and arcs, as well as more complex objects like 3D boxes with adjustable perspectives, stars, polygons and spirals. Rendering feature that can create objects like barcodes, calendars, grids, gears and roulette curves (using the spirograph tool). These objects may be filled with solid colors, patterns, radial or linear color gradients and their borders may be stroked, both with adjustable transparency. All of those can be further edited by transformations—such as moving, rotating, scaling and skewing—or by editing paths.

Other tools allow creating Bézier curves, freehand drawing of lines (pencil), or calligraphic (brush-like) strokes which support a graphics tablet.[15]

Inkscape is able to write and edit text with tools available for changing font, spacing, kerning, rotation, flowing along the path or into a shape. Text can be converted to paths for further editing. The program also has a layers (as well as an objects) feature that allows the user to organize objects in a preferred stacking order in the canvas. Objects can be made visible/invisible and locked/unlocked through these features.

Symbol libraries enable Inkscape to use existing symbols like logic-gate symbols or DOT pictograms. Additional libraries can be included by the user.[16]

Inkscape supports image tracing, the process of extracting vector graphics from raster sources.

Clones are child objects of an original parent object. Different transformations can be applied to them, such as: size, position, rotation, blur, opacity, color and symmetry. Clones are updated live whenever the parent object changes.

Every object in the drawing can be subjected to arbitrary affine transformations: moving, rotating, scaling, skewing and a configurable matrix. Transformation parameters can be specified numerically. Transformations can snap to angles, grids, guidelines and nodes of other objects, or be aligned in specified direction, spaced equally, scattered at random.

Objects can be grouped together. Groups of objects behave similarly to objects. Objects in a group can be edited without having to ungroup them first.

The Z-order determines the order in which objects are drawn on the canvas. Objects with a high Z-order are drawn on top of objects lower in the Z-order. Order of objects can be managed either using layers, or by manually moving the object up and down in the Z-order. Layers can be locked or hidden, preventing modifying and accidental selection.

The Create Tiled Clones tool allows symmetrical or grid-like drawings using various plane symmetries.

Appearance of objects can be further changed by using masks and clipping paths, which can be created from arbitrary objects, including groups.

The style attributes are 'attached' to the source object, so after cutting/copying an object onto the clipboard, the style's attributes can be pasted to another object.

Objects can also be moved by manually entering the location coordinates in the top toolbar. Even additions and subtractions can be done this way.

Inkscape has a comprehensive tool set to edit paths (as they are the basic element of a vector file):

• Edit Path by Node tool: allows for the editing of single or multiple paths and or their associated node(s). There are four types of path nodes; Cusp (corner), Smooth, Symmetric and Auto-Smooth. Editing is available for the positioning of nodes and their associated handles (angle and length) for Linear and Bézier paths or Spiro curves. A path segment can also be adjusted by dragging (left click + hold). When multiple nodes are selected, they can be moved, scaled and rotated using keyboard shortcut or mouse controls.[17] Additional nodes can be inserted into paths at arbitrary or even placements, and an effect can be used to insert nodes at predefined intervals. When nodes are deleted, the handles on remaining ones are adjusted to preserve the original shape as closely as possible.
• Tweak tool (sculpting/painting): provides whole object(s) or node editing regions (parts) of an object. It can push, repel/attract, randomize positioning, shrink/enlarge, rotate, copy/delete selected whole objects. With parts of a path you can push, shrink/enlarge, repel/attract, roughen edges, blur and color. Nodes are dynamically created and deleted when needed while using this tool, so it can also be used on simple paths without pre-processing.
• Path-Offsets; Outset, Inset, Linked or Dynamic: can create a Linked or Dynamic (unlinked) Inset and or an Outset of an existing path which can then be fine tuned using the given Shape or Node tool. Creating a Linked Offset of a path will update whenever the original is modified. Making symmetrical (i.e., picture frame) graphics easier to edit.
• Path-Conversion; Object to Path: conversions of Objects; Shapes (square, circle, etc.) or Text into paths.
• Path-Conversion; Stroke to Path: conversions of the Stroke of a shape to a path.
• Path-Simplify: a given path's node count will reduce while preserving the shape.
• Path-Operations (boolean operations): use of multiple objects to Union, Difference, Intersection, Exclusion, Division and Cut Path.

Inkscape includes a feature called Live Path Effects (LPE), which can apply various modifiers to a path. Envelope Deformation is available via the Path Effects and provides a perspective effect. There are more than a dozen of these live path effects. LPE can be stacked onto a single object and have interactive live on canvas and menu-based editing of the effects.

Inkscape's primary format is SVG 1.1, meaning that it can create and edit with the abilities and within the constraints of this format. Any other format must either be imported (converted to SVG) or exported (converted from SVG). The SVG format is using the Cascading Style Sheets (CSS) standard internally. Inkscape's implementation of SVG and CSS standards is incomplete. Most notably, it does not support animation natively.[18] Inkscape has multilingual support, particularly for complex scripts. Formats that used the UniConvertor library are not supported beyond the 1.0 release. A workaround is to have a parallel installation of version 0.92.x.[19]

• XML Editor for direct manipulation of the SVG XML structure
• Support for SVG filter effects
• Editing of Resource Description Framework (RDF), a World Wide Web Consortium (W3C) metadata information model
• Command-line interface, exposes format conversion functions and full-featured GUI scripting
• More than sixty interface languages
• Extensible to new file formats, effects and other features
• Mathematical diagramming, with various uses of LaTeX[20]
• Experimental support for scripting
• lib2Geom is now also external usable. 2Geom is a computational geometry library, originally developed for Inkscape. While developed for Inkscape it is a library that can be used from any application. It provides support for basic geometric algebra, paths, distortions, boolean operations, plotting implicit functions, non-uniform rational B-spline (NURBS) and more. 2Geom is free software released under LGPL 2.1 or MPL 1.1.[21][22]