On Sat, 28 May 2005 11:18:36 +0200
Joerg Lehmann <[EMAIL PROTECTED]> wrote:
> You could just define a new style deriving from the arrow style and
> replace the drawpoint function to do what you want. Just have a look at
> the code (in pyx/graph/style.py), it's pretty straightforward.
>
Here it is:
class arrow(graph.style.arrow):
def drawpoint(self, privatedata, sharedata, graph, point):
if privatedata.lineattrs is not None and privatedata.arrowattrs is not None
and sharedata.vposvalid:
linelength_pt = unit.topt(self.linelength)
x_pt, y_pt = graph.vpos_pt(*sharedata.vpos)
try:
angle = point["angle"] + 0.0
size = point["size"] + 0.0
except:
pass
else:
if point["size"] > self.epsilon:
dx = math.cos(angle*math.pi/180)
dy = math.sin(angle*math.pi/180)
x1 = x_pt #-0.5*dx*linelength_pt*size
y1 = y_pt #-0.5*dy*linelength_pt*size
x2 = x_pt+1.0*dx*linelength_pt*size
y2 = y_pt+1.0*dy*linelength_pt*size
privatedata.arrowcanvas.stroke(path.line_pt(x1, y1, x2, y2),
privatedata.lineattrs +
[deco.earrow(privatedata.arrowattrs, size=self.arrowsize*size)])
Can I suggest that these numbers (-0.5 and +0.5, which I changed to 0.0 and 1.0)
become parameters ?
Simon.
--
Simon Burton, B.Sc.
Licensed PO Box 8066
ANU Canberra 2601
Australia
Ph. 61 02 6249 6940
http://arrowtheory.com
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