Hello.
I am new at matplotlib and am trying to modify the
lasso demo so that a line is drawn aound the polygon
made of selected points, and so that this polygon area
is shaded. Ive added the following code to the
callback function but receive the error: CXX : Error
creating object of type N2Py7SeqBaseINS_6ObjectEEE.
Im sure this is a simple modification. Can anyone
offer suggestions?
def callback(self, verts):
ind = nx.nonzero(points_inside_poly(self.xys,
verts))
for i in range(self.Nxy):
if i in ind:
self.facecolors[i] = Datum.colorin
else:
self.facecolors[i] = Datum.colorout
xyo=list()
for i in ind:
xyo.append(self.xys[i])
col = RegularPolyCollection(fig.dpi, 7, sizes = 3,
offsets=xyo, transOffset=ax.transData)
ax.add_collection(col, autolim=True)
trans =
transforms.scale_transform(fig.dpi/transforms.Value(72.),fig.dpi/transforms.Value(72.))
col.set_transform(trans) # the points to pixels
transform
colors = [colorConverter.to_rgba(c) for c in
('r','g','b','c','y','m','k')]
col.set_color(colors)
self.canvas.draw_idle()
self.canvas.widgetlock.release(self.lasso)
del self.lasso
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