DXF, SVG and STEP viewer

DXF

From a DXF file the viewer takes the model space: lines, arcs, circles, polylines with their arc segments, splines and ellipses, and the entities inside block references. Text, hatches, dimensions and points are left out, as is the paper space. Each layer of the file becomes an entry in the legend, so a click hides or shows it.

planex2d joins ends that meet and cuts the edges against each other where they cross, as it does for every drawing it reads. A circle crossed by its center lines therefore shows as four arcs when the edges are colored by type, and the crossing points show as edge ends.

SVG

From an SVG file the viewer takes paths and shapes. Lines and circular arcs stay lines and arcs, Bézier curves become exact splines, and elliptical arcs become exact rational splines. Transforms are applied, and the y axis points up as in a drawing. Groups labeled as Inkscape layers become legend entries. Text and images are left out.

STEP and BREP

STEP and BREP files are read as planar parts: flat faces with their edges, which may be lines, arcs, circles, ellipses or B-splines. The faces are filled, and the names and colors a STEP file gives its parts are kept by the reader. The viewer opens planar files only. See STEP and BREP in the docs for the readers and their options.

Units

Sizes are shown in millimeters where the file names its length unit, converted from inches or meters where needed: a DXF file names it in its header, an SVG file in its width and height, a STEP file always. A file that names no unit shows its numbers as written, marked u. BREP files carry no unit, and an SVG file without one counts in CSS pixels (px).

1. Load

   The page loads Python and planex2d into this tab. Your browser keeps both in its cache, so later visits start faster.

2. Read

   When you open a file, the browser reads it from your disk into memory. No request carries it to a server.

3. Convert

   planex2d reads the file into exact geometry. Lines, arcs, circles and splines stay curves, and ends that touch are joined into wires.

4. Draw

   Plotly draws the geometry finely enough to stay smooth when you zoom in about ten times. A click on a layer in the legend hides or shows it.

Supported files

Run it in Python

Everything the viewer does is available in the library. Install it and see Files in the docs for every reader.

$ pip install planex2d

import planex as px

plate = px.FromStep("slotted-plate.step")
px.Plot(plate, backend="plotly")

Privacy

Limits

• The viewer opens planar STEP and BREP files only.
• In the browser, planex2d runs in one thread, so large drawings take longer than in Python on your machine.
• A file that does not open? Open an issue on GitHub and attach the file if you can.