Hi Forum,
I am using matplotlib in a PyQt4 App.
I wanted to add a watermark-type pictures to the standard white background
of the canvas.
My current version of this is :
def getwatermark(self):
factor=1.0 #factor for scaling image
im1=QtGui.QPixmap(':/watermark.png')
im=im1.toImage()
self.watermark_ratio=(im.height()/factor)/(im.width()/factor)
ival0=[]
for i in range(im.width()):#range(2): #range(im.width()):
for j in range(im.height()):#range(3): #range(im.height()):
if int(im.pixel(i,j))==0:
ival0.append(43)
else:
ival0.append(40)
self.watermark=reshape(ival0,(im.width(),im.height()))
def placewatermark(self,canvas,axes):
try:
if self.version=='1':
grayfactor=24 #factor for grayscale
canvassize=canvas.size()
if canvas.__class__.__name__=='MyPFCanvas':
#for PF, the IV canvas is split in two figures...
bottom=self.IVTab.IVcanvas.vert[0]._scalable_size
spacing=self.IVTab.IVcanvas.vert[1]._scalable_size
top=self.IVTab.IVcanvas.vert[2]._scalable_size
correctionY=top/(top+spacing+bottom)
else:
correctionY=1
origaxes=axes.axis()
xrange=origaxes[1]-origaxes[0]
yrange=origaxes[3]-origaxes[2]
xcanvas=canvassize.width()
ycanvas=canvassize.height()*correctionY
if (xcanvas/float(ycanvas))>self.watermark_ratio:
yfig=yrange
centery=origaxes[2]
xfig=self.watermark_ratio*yrange
xfig=(yfig*self.watermark_ratio)*(xrange/yrange)*(ycanvas/float(xcanvas))
centerx=origaxes[0]+(xrange-xfig)/2
else:
xfig=xrange
centerx=origaxes[0]
yfig=(xfig/self.watermark_ratio)*(yrange/xrange)/(ycanvas/float(xcanvas))
centery=origaxes[2]+(yrange-yfig)/2
axes.imshow(self.watermark,origin='lower',extent=(centerx,centerx+xfig,centery,centery+yfig),vmin=0,vmax=43,cmap=cm.gray)
#,extent=(centerx,centerx+xfig,centery,centery+yfig),,
axes.axis('auto')
axes.axis(origaxes)
canvas.draw()
except:
## print "no watermark placeD"
pass
What is the best way to do this ?
Regards,
Dimitri
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