Simple drawing
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newpath()
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moveto(x,y)
moveto([x,y])
moveto(P)
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lineto(x,y)
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stroke(c)
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fill(c)
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box(w, h)
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box(x, y, w, h)
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bbox(llx, lly, urx, ury)
Simple coordinate changes
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translate(x,y)
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center()
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scale(s)
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scale(s, t)
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rotate(a)
rotate(P, a)
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atransform(t)
Squares and ...
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