Abstract: According to an embodiment, the invention relates to a computer implemented method for grading a pattern from a first size to a second size, the pattern comprising one or more panels, the method comprising the steps of a representation step comprising representing each panel of the one or more panels by a contour, wherein a contour comprises one or more segments, a constraint step comprising imposing constraints on segments for grading to the second size; generating a mesh of each panel of the one or more panels thereby obtaining a first set of meshes; combining the first set of meshes with the constraints into a system of equations; solving the system of equations into a second set of meshes, wherein the contours of the second meshes correspond to the pattern in the second size and representing the contours of the second set of meshes.