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function ge_set_winsize(a)
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//Author : Serge Steer 2002
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rect=ge_dig_bound(GraphList);
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w=max(rect(3)-rect(1),1);
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h=max(rect(4)-rect(2),1);
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if rhs==0 then j=1.5;a=max(600/(j*w),400/(j*h),j); end
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w=600;h=400;rect=[0,0,w,h];
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if rhs==0 then a=1.5; end
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width=EGdata.Zoom*w*a;height=EGdata.Zoom*h*a
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xset('wdim',width,height);
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xsetech([b,b,1/a,1/a],rect)
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%XSHIFT=max((width-r(1))/2,0)
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%YSHIFT=max((height-r(2))/2,0)
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xset('viewport',%XSHIFT,%YSHIFT)