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get extreme values.
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nx, ny : number of dvision in each axis
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the transData of the axes to the world coordinate.
locator1, locator2 : grid locator for 1st and 2nd axis.
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transform : transfrom from the image coordinate (which will be
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or transform = (transform_xy, inv_transform_xy)
locator1, locator2 : grid locator for 1st and 2nd axis.
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