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| The
previous scaling transformation leaves the origin |
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| unaltered. If the point (xf,yf)
is to be the fixed point, the |
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| transformation is: |
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x' = xf + (x - xf) Sx |
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y' = yf + (y - yf) Sy |
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| This can be rearranged to give: |
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x' = x Sx +
(1 - Sx) xf |
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y' = y Sy +
(1 - Sy) yf |
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