GeezerVison

The World Wide Web, restored to 800 pixels of glory.

GeezerVison is showing smallbasic.github.io — SmallBASIC | M3APPLY

Edit History

M3APPLY

M3APPLY M, BYREF poly

Home > Reference > Math

Apply 2D transformation matrix M to poly-line poly. Transformation matrix M is a 3x3 matrix.

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

M3TRANS, M3SCALE and M3ROTATE perform a matrix multiplication. When performing matrix multiplication, then last matrix is applied first. In the example above, the rectangle is first rotated, then scaled and in the last step translated. If the order is changed, the outcome might be different.

Math

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

This page was last edited on Tue, 6 Jun 2023 15:46:53 +0200 | Markdown processed with pandoc 3.1.12.1

You are visitor 01402503 — GeezerVison does not store the pages you look up.
Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required.