Test should not be testing against the polygonization error; if done
correctly that should all be on the correct side of the shape. Use an
epsilon instead (I chose polygonization error / 10, but the value isn't
terribly important).
Fixes https://gitlab.com/kicad/code/kicad/issues/10724
The existing algorithm nicely handled the error being on the inside (where
the segment ends are error-free), but not when it was on the outside (where
the segment midpoints are error-free).
In any case, we want error-free points at each end of the arc so we don't
get ears or divots.
- allows setting a minimal seg count for circles and rounded end segments.
- When using ERROR_OUTSIDE, ensure the arc correction is the actual value
needed by the segment count, not the max value allowed
- Some are related to shape errors when the allowed error to approximate circle
by segment is large and arc radius small.
- fix the actual error used in ConvertToPolyline().
- Use SHAPE_ARC::DefaultAccuracyForPCB() instead of a fixed value as extra margin
in zones. It should not change something, because it is also a fixed value
(5 micrometers), but it is not a magic number.
-TransformArcToPolygon() fix some issues and add a new algo, based on the arc actual
outline shape (initial algo is still available in code, just in case).
Note also the transform is still not good: the same parameters are applied
to convert inner arc, outer arc and middle arc of a thick arc to segments.
But these parameters depend on arc radius (or circle radius) value.
The error between the "right" shape and the polygon is slightly smaller.
The approximations of the inner arc and the outer arc are better, but not perfect.
Also add (for test and debug purpose only) the code to show the polygon when
drawing a PCB_ARC (currently disabled)
Segment approximation for arcs leaves small "indents" where the rounded
edges of two segments don't quite meet.
This gives closer approximation by calculating the inner and outer joint
points based on the radius, eliminating the indents.
For round rect pads, when the arc error was OUTSIDE, the shape was too big and creates
bad shape for chamfered round rect pads.
For chamfered pads, when the clearance value was not 0, the chamfer was not at the
right place.
Start, mid and end are the "real" properties and come with less
error.
Also collapses two arc polygonization routines into one.
Also fixes DRC checks to be cognizant of arc approximation error.
Fixes https://gitlab.com/kicad/code/kicad/issues/6039
1) For a while now we've been using a calculated seg count from a given
maxError, and a correction factor to push the radius out so that all
the error is outside the arc/circle. However, the second calculation
(which pre-dates the first) is pretty much just the inverse of the first
(and yields nothing more than maxError back). This is particularly
sub-optimal given the cost of trig functions.
2) There are a lot of old optimizations to reduce segcounts in certain
situations, someting that our error-based calculation compensates for
anyway. (Smaller radii need fewer segments to meet the maxError
condition.) But perhaps more importantly we now surface maxError in the
UI and we don't really want to call it "Max deviation except when it's
not".
3) We were also clamping the segCount twice: once in the calculation
routine and once in most of it's callers. Furthermore, the caller
clamping was inconsistent (both in being done and in the clamping
value). We now clamp only in the calculation routine.
4) There's no reason to use the correction factors in the 3Dviewer;
it's just a visualization and whether the polygonization error is
inside or outside the shape isn't really material.
5) The arc-correction-disabling stuff (used for solder mask layer) was
somewhat fragile in that it depended on the caller to turn it back on
afterwards. It's now only exposed as a RAII object which automatically
cleans up when it goes out of scope.
6) There were also bugs in a couple of the polygonization routines where
we'd accumulate round-off error in adding up the segments and end up with
an overly long last segment (which of course would voilate the error
max). This was the cause of the linked bug and also some issues with vias
that we had fudged in the past with extra clearance.
Fixes https://gitlab.com/kicad/code/kicad/issues/5567
the old calculations was creating a slightly too small shape for rounded corners.
Now the polygon is outside the perfect shape (as required to create a shape with clearance)
Fixes#4805https://gitlab.com/kicad/code/kicad/issues/4805
There were a lot of plotters, exporters, etc. that were rolling their
own implementations.
This also introduces a lazily-built set of SHAPE objects for doing
collision detection and some forms of rendering (and later DRC).
- Fix non optimal shape of solid polygons after inflate transform.
- Add a small extra clearance ((2 microns) when creating clearance areas
(especially, convert arc to polygons create small differences)
- Add a small threshold (1 micron) in drc test distances to avoid false positives
- fix a minor issue in TransformOvalToPolygon that created sometimes a not perfect shape
Fixes#3812https://gitlab.com/kicad/code/kicad/issues/3812
* Split up the thirdparty code into the thirdparty folder (#3637)
* Create a new kimath static library containing all the math functions
This is part of cleaning the build system for #1906.
2020-01-07 17:12:59 +00:00
Renamed from common/convert_basic_shapes_to_polygon.cpp (Browse further)
Jeff Young
Marek Roszko
david-beinder
Wayne Stambaugh
jean-pierre charras
Seth Hillbrand
Ian McInerney