Marking edges

Imported geometry often has defects that are invisible at full scale: a step of a thousandth, or an outline that stops just short of its start. px.Plot marks such edges at their midpoints, and it marks any edges you choose in the same way. Three options do this:

• mark_edges_smaller=d marks every edge shorter than d;

• mark_free_edges=True marks every edge with an end that no other edge shares;

• highlight marks the edges given, as ids, selected edges or faces, or edge indices.

import planex as px

An imported outline with defects

The example is an outline read as a polyline, with two defects: a step of 0.001 that should not be there, and an end that does not reach the start. px.FromPolyline makes a wire of lines through the points. The step is the only edge shorter than 1, and the first and the last edge each end in nothing.

outline = px.FromPolyline([(0, 0), (100, 0), (100, 1e-3), (200, 1e-3), (200, 100), (2, 100)])
outline.Plot(mark_edges_smaller=1, mark_free_edges=True);

Chosen edges

The example marks the edges of the outline whose centers lie above y = 50, selected with edges[px.y > 50]:

outline.Plot(highlight=outline.edges[px.y > 50]);

Colors from the edges

With line_col="property", each edge is drawn in its own color, col. The example is the flow channel from Names and colors, with the inlet in blue and the outlet in orange:

sketch = px.QuickSketch().Line(2.2, name="wall").Line(0, 0.41, name="outlet", col=(0.9, 0.3, 0.1))
channel = sketch.Line(-2.2, 0, name="wall").Close(name="inlet", col=(0.1, 0.4, 0.9)).Face()
fluid = channel - px.Circle((0.2, 0.2), 0.05).Face()
fluid.Plot(line_col="property");

Sketches have plots of their own, with their constraint states, signs and ids. See Sketch plots for details.