M3IDENT

M3IDENT BYREF M

Creates a 3x3 Identity matrix M:

    |1  0  0|
M = |0  1  0|
    |0  0  1|

The Identy matrix can be used with M3TRANS, M3SCALE, M3ROTATE and M3APPLY to perform 2D transformations of a poly-line.

Example

DIM M(2,2)

Rectangle = [-1,-1, 1,-1, 1,1, -1,1, -1,-1]  ' Create a rectangular polygon

M3IDENT M                                    ' Create Identity Matrix

M3Trans M, 100,100                           ' Move rectangle to position (100,100) 
M3SCALE M, 0, 0, 50, 50                      ' Scale rectangle by factor 50 in x and y
M3ROTATE M, 45*pi/180                        ' Rotate by 45°

M3APPLY M, Rectangle                         ' Transform the rectangle

DRAWPOLY Rectangle

ABS ABSMAX ABSMIN ACOS ACOSH ACOT ACOTH ACSC ACSCH ASEC ASECH ASIN ASINH ATAN ATAN2 ATANH ATN CEIL COS COSH COT COTH CSC CSCH DEG DERIV DETERM DIFFEQN EXP EXPRSEQ FIX FLOOR FRAC INT INTERSECT INVERSE LINEQN LOG LOG10 M3APPLY M3IDENT M3ROTATE M3SCALE M3TRANS MAX MIN POLYAREA POLYCENT POLYEXT POW PTDISTLN PTDISTSEG PTSIGN RAD RND ROOT ROUND SEC SECH SEGCOS SEGLEN SEGSIN SEQ SGN SIN SINH SQR STATMEAN STATMEANDEV STATMEDIAN STATSPREADP STATSPREADS STATSTD SUM SUMSQ TAN TANH TRANSPOSE

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M3IDENT

Example