code: def zoomTo(self, bbox):
          'set visible area to bbox, maintaining aspectRatio if applicable'
          self.fixPoint(self.plotviewBox.xymin, bbox.xymin)
          self.zoomlevel=max(bbox.w/self.canvasBox.w, bbox.h/self.canvasBox.hf zoomTo(self, bbox):
          'set visible area to bbox, maintaining aspectRatio if applicable'
          self.fixPoint(self.plotviewBox.xymin, bbox.xymin)
          self.zoomlevel=max(bbox.w/self.canvasBox.w, bbox.h/self.canvasBox.h)
docs: set visible area to bbox, maintaining aspectRatio if applicable