Transformation Matrices (2x2)
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stretch (parallel to y axis, scale factor k)
( 1 0 ) ( 0 k )
shear (parallel to y axis)
( 1 0 ) ( k 1 )
shear (parallel to x axis)
( 1 k ) ( 0 1 )
stretch (parallel to x axis, scale factor k)
( k 0 ) ( 0 1 )