def run(self, ips, snap, img, para = None):
if para == None: para = self.para
a = para['ang']/180.0*np.pi
o = np.array(ips.size)*0.5
if ips.roi!=None:
box = ips.roi.get_box()
o = np.array([box[1]+box[3],box[0]+box[2]])*0.5
trans = np.array([[np.cos(a),-np.sin(a)],[np.sin(a),np.cos(a)]])
offset = o-trans.dot(o)
nimg.affine_transform(snap, trans, output=img, offset=offset)
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