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Draft: split svg.get_path function for paths that are BSplines

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If it's not a circle nor ellipse nor straight line
convert the curve to BSpline. Move into a subfunction.

Improve a few varible names to be more verbose, like `vertex`
and `edge`.
This commit is contained in:
vocx-fc
2020-09-17 00:35:25 -05:00
committed by Yorik van Havre
parent d3cbfa4071
commit 5465726b85
1 changed files with 55 additions and 48 deletions
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103
src/Mod/Draft/draftfunctions/svg.py
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@@ -656,6 +656,42 @@ def _get_path_circ_ellipse(plane, edge, vertex, edata,
return "edata", edata
def _get_path_bspline(plane, edge, edata):
"""Convert the edge to a BSpline and discretize it."""
bspline = edge.Curve.toBSpline(edge.FirstParameter, edge.LastParameter)
if bspline.Degree > 3 or bspline.isRational():
try:
bspline = bspline.approximateBSpline(0.05, 50, 3, 'C0')
except RuntimeError:
_wrn("Debug: unable to approximate bspline from edge")
if bspline.Degree <= 3 and not bspline.isRational():
for bezierseg in bspline.toBezier():
if bezierseg.Degree > 3: # should not happen
_wrn("Bezier segment of degree > 3")
raise AssertionError
elif bezierseg.Degree == 1:
edata += 'L '
elif bezierseg.Degree == 2:
edata += 'Q '
elif bezierseg.Degree == 3:
edata += 'C '
for pole in bezierseg.getPoles()[1:]:
v = get_proj(pole, plane)
edata += '{} {} '.format(v.x, v.y)
else:
_msg("Debug: one edge (hash {}) "
"has been discretized "
"with parameter 0.1".format(edge.hashCode()))
for linepoint in bspline.discretize(0.1)[1:]:
v = get_proj(linepoint, plane)
edata += 'L {} {} '.format(v.x, v.y)
return edata
def get_path(obj, plane,
fill, pathdata, stroke, linewidth, lstyle,
fill_opacity=None,
@@ -684,40 +720,40 @@ def get_path(obj, plane,
egroups = []
first = True
for w in wires:
w1 = w.copy()
wire = w.copy()
if first:
first = False
else:
# invert further wires to create holes
w1 = DraftGeomUtils.invert(w1)
wire = DraftGeomUtils.invert(wire)
w1.fixWire()
egroups.append(Part.__sortEdges__(w1.Edges))
wire.fixWire()
egroups.append(Part.__sortEdges__(wire.Edges))
for egroupindex, edges in enumerate(egroups):
for _, _edges in enumerate(egroups):
edata = ""
vs = () # skipped for the first edge
vertex = () # skipped for the first edge
for edgeindex, e in enumerate(edges):
previousvs = vs
for edgeindex, edge in enumerate(_edges):
previousvs = vertex
# vertexes of an edge (reversed if needed)
vs = e.Vertexes
vertex = edge.Vertexes
if previousvs:
if (vs[0].Point - previousvs[-1].Point).Length > 1e-6:
vs.reverse()
if (vertex[0].Point - previousvs[-1].Point).Length > 1e-6:
vertex.reverse()
if edgeindex == 0:
v = get_proj(vs[0].Point, plane)
v = get_proj(vertex[0].Point, plane)
edata += 'M {} {} '.format(v.x, v.y)
else:
if (vs[0].Point - previousvs[-1].Point).Length > 1e-6:
if (vertex[0].Point - previousvs[-1].Point).Length > 1e-6:
raise ValueError('edges not ordered')
iscircle = DraftGeomUtils.geomType(e) == "Circle"
isellipse = DraftGeomUtils.geomType(e) == "Ellipse"
iscircle = DraftGeomUtils.geomType(edge) == "Circle"
isellipse = DraftGeomUtils.geomType(edge) == "Ellipse"
if iscircle or isellipse:
_type, data = _get_path_circ_ellipse(plane, e, vs,
_type, data = _get_path_circ_ellipse(plane, edge, vertex,
edata,
iscircle, isellipse,
fill, stroke,
@@ -728,42 +764,13 @@ def get_path(obj, plane,
# else the `edata` was properly augmented, so re-assing it
edata = data
elif DraftGeomUtils.geomType(e) == "Line":
v = get_proj(vs[-1].Point, plane)
elif DraftGeomUtils.geomType(edge) == "Line":
v = get_proj(vertex[-1].Point, plane)
edata += 'L {} {} '.format(v.x, v.y)
else:
# If it's not a circle nor ellipse nor straight line
# convert the curve to BSpline
bspline = e.Curve.toBSpline(e.FirstParameter, e.LastParameter)
if bspline.Degree > 3 or bspline.isRational():
try:
bspline = bspline.approximateBSpline(0.05, 50, 3, 'C0')
except RuntimeError:
_wrn("Debug: unable to approximate bspline from edge")
if bspline.Degree <= 3 and not bspline.isRational():
for bezierseg in bspline.toBezier():
if bezierseg.Degree > 3: # should not happen
_wrn("Bezier segment of degree > 3")
raise AssertionError
elif bezierseg.Degree == 1:
edata += 'L '
elif bezierseg.Degree == 2:
edata += 'Q '
elif bezierseg.Degree == 3:
edata += 'C '
for pole in bezierseg.getPoles()[1:]:
v = get_proj(pole, plane)
edata += '{} {} '.format(v.x, v.y)
else:
_msg("Debug: one edge (hash {}) "
"has been discretized "
"with parameter 0.1".format(e.hashCode()))
for linepoint in bspline.discretize(0.1)[1:]:
v = get_proj(linepoint, plane)
edata += 'L {} {} '.format(v.x, v.y)
edata = _get_path_bspline(plane, edge, edata)
if fill != 'none':
edata += 'Z '