def getSVG(shape, opts=None):
"""
Export a shape to SVG
"""
d = {'width': 800, 'height': 240, 'marginLeft': 200, 'marginTop': 20}
if opts:
d.update(opts)
# need to guess the scale and the coordinate center
uom = guessUnitOfMeasure(shape)
width = float(d['width'])
height = float(d['height'])
marginLeft = float(d['marginLeft'])
marginTop = float(d['marginTop'])
hlr = HLRBRep_Algo()
hlr.Add(shape.wrapped)
projector = HLRAlgo_Projector(gp_Ax2(gp_Pnt(), DEFAULT_DIR))
hlr.Projector(projector)
hlr.Update()
hlr.Hide()
hlr_shapes = HLRBRep_HLRToShape(hlr.GetHandle())
visible = []
visible_sharp_edges = hlr_shapes.VCompound()
if not visible_sharp_edges.IsNull():
visible.append(visible_sharp_edges)
visible_smooth_edges = hlr_shapes.Rg1LineVCompound()
if not visible_smooth_edges.IsNull():
visible.append(visible_smooth_edges)
visible_contour_edges = hlr_shapes.OutLineVCompound()
if not visible_contour_edges.IsNull():
visible.append(visible_contour_edges)
hidden = []
hidden_sharp_edges = hlr_shapes.HCompound()
if not hidden_sharp_edges.IsNull():
hidden.append(hidden_sharp_edges)
hidden_contour_edges = hlr_shapes.OutLineHCompound()
if not hidden_contour_edges.IsNull():
hidden.append(hidden_contour_edges)
# Fix the underlying geometry - otherwise we will get segfaults
for el in visible:
breplib.BuildCurves3d(el, TOLERANCE)
for el in hidden:
breplib.BuildCurves3d(el, TOLERANCE)
# convert to native CQ objects
visible = list(map(Shape, visible))
hidden = list(map(Shape, hidden))
(hiddenPaths, visiblePaths) = getPaths(visible, hidden)
# get bounding box -- these are all in 2-d space
bb = Compound.makeCompound(hidden + visible).BoundingBox()
# width pixels for x, height pixesl for y
unitScale = min(width / bb.xlen * 0.75, height / bb.ylen * 0.75)
# compute amount to translate-- move the top left into view
(xTranslate, yTranslate) = ((0 - bb.xmin) + marginLeft / unitScale,
(0 - bb.ymax) - marginTop / unitScale)
# compute paths ( again -- had to strip out freecad crap )
hiddenContent = ""
for p in hiddenPaths:
hiddenContent += PATHTEMPLATE % p
visibleContent = ""
for p in visiblePaths:
visibleContent += PATHTEMPLATE % p
svg = SVG_TEMPLATE % ({
"unitScale": str(unitScale),
"strokeWidth": str(1.0 / unitScale),
"hiddenContent": hiddenContent,
"visibleContent": visibleContent,
"xTranslate": str(xTranslate),
"yTranslate": str(yTranslate),
"width": str(width),
"height": str(height),
"textboxY": str(height - 30),
"uom": str(uom)
})
# svg = SVG_TEMPLATE % (
# {"content": projectedContent}
#)
return svg
anEdge1OnSurf1 = BRepBuilderAPI_MakeEdge(Handle_Geom2d_Curve(anArc1),
Handle_Geom_Surface(aCyl1))
anEdge2OnSurf1 = BRepBuilderAPI_MakeEdge(aSegment.Value(),
Handle_Geom_Surface(aCyl1))
anEdge1OnSurf2 = BRepBuilderAPI_MakeEdge(Handle_Geom2d_Curve(anArc2),
Handle_Geom_Surface(aCyl2))
anEdge2OnSurf2 = BRepBuilderAPI_MakeEdge(aSegment.Value(),
Handle_Geom_Surface(aCyl2))
threadingWire1 = BRepBuilderAPI_MakeWire(anEdge1OnSurf1.Edge(),
anEdge2OnSurf1.Edge())
threadingWire2 = BRepBuilderAPI_MakeWire(anEdge1OnSurf2.Edge(),
anEdge2OnSurf2.Edge())
# Compute the 3D representations of the edges/wires
breplib.BuildCurves3d(threadingWire1.Shape())
breplib.BuildCurves3d(threadingWire2.Shape())
# Create the surfaces of the threading
aTool = BRepOffsetAPI_ThruSections(True)
aTool.AddWire(threadingWire1.Wire())
aTool.AddWire(threadingWire2.Wire())
aTool.CheckCompatibility(False)
myThreading = aTool.Shape()
# Build the resulting compound
aRes = TopoDS_Compound()
aBuilder = BRep_Builder()
aBuilder.MakeCompound(aRes)
aBuilder.Add(aRes, myBody.Shape())
aBuilder.Add(aRes, myThreading)