def charge_all(self,values):
for r in range(0,self.rows):
for c in range(0,self.cols):
#self.matrix[r][c].draw()
spot = self.matrix[r][c]
if values[c][r] > threshold:
spot.setValue(spot.value + values[c][r]/255.0*charge_factor)
def charge(self,row,col,cvalue):
spot = self.matrix[row][col]
spot.setValue(spot.value + cvalue)