Estimate a value inside a rectangle from the four corner values.
Last updated: June 2026 | By Patchworkr Team
f(x, y) = q11(1 - t)(1 - u) + q21t(1 - u) + q12(1 - t)u + q22tu
t = (x - x1) / (x2 - x1), u = (y - y1) / (y2 - y1)
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