Programmer Guide/Command Reference/EVAL/pgtrans: Difference between revisions
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(Created page with '{{DISPLAYTITLE:{{SUBPAGENAME}}}} Shift, scale and/or rotate a polygon. ;Usage: :<code>pgtrans(<var>X</var>, <var>IX</var> {, <var>DX</var>, <var>DY</var>), <var>KX</var>, <var>KY…') |
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:;<var>IX</var>:The index of the polygon of ''X'' to be tested; 0 <= <var>IX</var> < <code>[[../pgget|pgget]](''X'')</code> | :;<var>IX</var>:The index of the polygon of ''X'' to be tested; 0 <= <var>IX</var> < <code>[[../pgget|pgget]](''X'')</code> | ||
:;<var>DX, DY</var>: shift values for x and y (default=0, no shift) | :;<var>DX, DY</var>: shift values for x and y (default=0, no shift) | ||
::shift the center point <code><XC,YC></code> of polygon ''X<sub>IX</sub>'' to <code><XC+''DX'',YC+''YC''> | ::-> shift the center point <code><XC,YC></code> of polygon ''X<sub>IX</sub>'' to <code><XC+''DX'',YC+''YC''> | ||
:;<var>KX, KY</var>: scaling factors; both factors must be greater than zero (default=1, no scaling) | :;<var>KX, KY</var>: scaling factors; both factors must be greater than zero (default=1, no scaling) | ||
:;<var>A</var>: rotation angle in degree (default=0, no rotation); a scaling factors (default=1) | :;<var>A</var>: rotation angle in degree (default=0, no rotation); a scaling factors (default=1) | ||
Revision as of 10:02, 20 April 2011
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 polygon XIX to<XC+DX,YC+YC> - KX, KY
- scaling factors; both factors must be greater than zero (default=1, no scaling)
- A
- rotation angle in degree (default=0, no rotation); a scaling factors (default=1)
- rotate the polygon around the center point
