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4 Scaling
The size of L
A
TEX picture objects may be uniformly scaled by preceding them with:
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\setlength{\unitlength}{x\unitlength}
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where
x
the desired scale factor is a decimal number.
The
\scaleput
s in
\RAFsixE
position the curves using the scale factors
\xscale
,
\xscaley
,
\yscale
and
\yscalex
. The drawing commands use the same scale factors.
curve
initially sets these scale factors to 1, 0, 1 and 0 respectively.
\renewcommand
may reset them to any decimal number. These factors can rotate pictures. The factors following rotate the RAF 6E through 12
clockwise about its
(0,0)
co-ordinate:
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\renewcommand{\xscale}{0.9781}
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\renewcommand{\xscaley}{0.2079}
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\renewcommand{\yscale}{0.9781}
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\renewcommand{\yscalex}{-0.2079}
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\put(0,20){\RAFsixE}
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This draws:
The RAF 6E has maximum lift at angles of attack over 12
.
Note that
and
Axonometric projection is another scaling application. Circles become ellipses and circular arcs become elliptical arcs. The commands drawing the ellipse and arc in the following washer are:
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\put(20,5){
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\renewcommand{\xscale}{1}
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\renewcommand{\xscaley}{-1}
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\renewcommand{\yscale}{0.6}
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\renewcommand{\yscalex}{0.6}
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\scaleput(10,10){\bigcircle{10}}
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\put(0,-2){
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\scaleput(10,10){\arc(5,0){121}}
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\scaleput(10,10){\arc(5,0){-31}}
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}
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}
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(20,5)
are the drawing coordinates of the upper vertex of the washer closest to the reader. The angles for the
\arc
s were found by trial and error.
Square washers are sometimes preferred for soft materials.