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The meanings of and relationships between the parameters are:
If tvpe parameter is O(as specified or by default), SC defines antisotropic
sealin,g;the first form of the command is assumed and the last two param-
eters,
l and bottotn.are ignoredeven ifpresent;xmin, ]!rnin becometheuser
coordinates of P1,and xmax,)’ma.r,the coordinates of P2.
If t?ywparameter is 1, SC defines isotropic scaling; the first form of the
command is assumed, and parameters leji and bottom (or defaults) are used;
.vnin, ymin become the user coordinates of point Q1,and .mw, lmax, the
user coordinates of point Q2, defined as follows:
● the rectangle whose diagonal isQ1– Q2 is the largest which iscontained
in the rectangle whose diagonal is P1 – P2.
● if the plotter coordinates of Q1and Q2 are xq 1,yq1and xq2, yq2, then:
(xql – xq2)/(xmin - xmax) = (yql - yq2)/(ymin - ymax)
● if the two rectangles do not coincide:
if abs(xql – xq2) = abs(xp 1– xp2)
then, yql = yp 1+ bottorn/100 * abs(yq 1– yq2)
and left is disregarded
if abs(yq I – yq2) = abs(ypl – yp2)
then, xq 1= xpl + left/100 Yabs(xq1– xq2)
and bottom is disregarded
If
type parameter is2, SC defines point-factorscaling;the second form of the
cdmmand is used (Igfiand bottom are notused);xmin, ymin become the user
coordinates of P1,and the user coordinates of P2 are set to:
xmin + (xp2 – xp 1)/xfact, ymin + (yp2 – yp1)/yfact
Without parameters, this command eliminates scaling and sets the user
coordinate system to the plotter coordinate system.
If there are less than 4, exactly 6. or more than 7 parameters, this command
is ignored.
If.rministhe same asxmux, or ifymin isthe same as~max, orifx~actor}~act
is 0, the command is ignored.
When appropriate, the scaling defined by SC has priorityover that obtained
from the ratio: [size of picture frame]/[plot size]
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