pgtrans

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Shift, scale and/or rotate a polygon.

Usage
pgtrans(X, IX {, DX, DY), KX, KY, A})
X
a closed point-list or a polygon-stream defining one or more polygons.
IX
The index of the polygon of X to be tested; 0 <= IX < pgget(X)
DX, DY
shift values for x and y (default=0, no shift)
  • shift the center point <xc,yc> of XIX
<x[i] , y[i]> -> <x[i]+DX , y[i]+DY>
KX, KY
scaling factors; both factors must be greater than zero (default=1, no scaling)
  • scale the distances of corners of XIX to the center point
<x[i] , y[i]> -> <(x[i]-xc)*KX+xc , (y[i]-yc)*KY'+yc>
A
rotation angle in degree (default=0, no rotation); a scaling factors (default=1)
  • rotate the polygon around the center point
Result
The result r is a polygon-stream containing the transformed XIX.
See also
pginit, pgget, pgitest, pgxgrid, pgsplit, pgtrans, pghull

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