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Quantify directive Large in graphics?

Mirek M

Posted 5 years ago

Hi, During my work with mathematics, I came across a problem with how to quantify directive Large etc. I need to quantify the directive to export my graphics to an external vector format. I copied an example from the help command Graphics. Graphics[{Thick, Green, Rectangle[{0, -1}, {2, 1}], Red, Disk[], Blue, Circle[{2, 0}], Yellow, Polygon[{{2, 0}, {4, 1}, {4, -1}}], Purple, Arrowheads[Large], Arrow[{{4, 3/2}, {0, 3/2}, {0, 0}}], Black, Dashed, Line[{{-1, 0}, {4, 0}}]}] I tried FullForm to look inside, but no result. Graphics[List[Thickness[Large],RGBColor[0,1,0],Rectangle[List[0,-1],List[2,1]],RGBColor[1,0,0],Disk[List[0,0]],RGBColor[0,0,1],Circle[List[2,0]],RGBColor[1,1,0],Polygon[List[List[2,0],List[4,1],List[4,-1]]],RGBColor[0.5`,0,0.5`],Arrowheads[Large],Arrow[List[List[4,Rational[3,2]],List[0,Rational[3,2]],List[0,0]]],GrayLevel[0],Dashing[List[Small,Small]],Line[List[List[-1,0],List[4,0]]]]] I guess the problem is related to evaluating graphics by FrontEnd, but I don't know how to convince Mathematica to return an evaluated expression with substution by numbers. Do you how to get result?

Hi,

During my work with mathematics, I came across a problem with how to quantify directive Large etc. I need to quantify the directive to export my graphics to an external vector format. I copied an example from the help command Graphics.

Graphics[{Thick, Green, Rectangle[{0, -1}, {2, 1}], Red, Disk[], Blue,
Circle[{2, 0}], Yellow, Polygon[{{2, 0}, {4, 1}, {4, -1}}], Purple,
Arrowheads[Large], Arrow[{{4, 3/2}, {0, 3/2}, {0, 0}}], Black, 
Dashed, Line[{{-1, 0}, {4, 0}}]}]

I tried FullForm to look inside, but no result.

Graphics[List[Thickness[Large],RGBColor[0,1,0],Rectangle[List[0,-1],List[2,1]],RGBColor[1,0,0],Disk[List[0,0]],RGBColor[0,0,1],Circle[List[2,0]],RGBColor[1,1,0],Polygon[List[List[2,0],List[4,1],List[4,-1]]],RGBColor[0.5`,0,0.5`],Arrowheads[Large],Arrow[List[List[4,Rational[3,2]],List[0,Rational[3,2]],List[0,0]]],GrayLevel[0],Dashing[List[Small,Small]],Line[List[List[-1,0],List[4,0]]]]]

I guess the problem is related to evaluating graphics by FrontEnd, but I don't know how to convince Mathematica to return an evaluated expression with substution by numbers.

Do you how to get result?

POSTED BY: Mirek M

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Henrik Schachner

Henrik Schachner, Radiation Therapy Center, Weilheim, Germany

Posted 5 years ago

Maybe this is what you want: gr = Graphics[(* your graphics )]; AbsoluteOptions[gr] EDIT:* Probably better is to avoid directives like `Large` at all, e.g.: Graphics[{AbsoluteThickness[3], Green, Rectangle[{0, -1}, {2, 1}], Red, Disk[], Blue, Circle[{2, 0}], Yellow, Polygon[{{2, 0}, {4, 1}, {4, -1}}], Purple, Arrowheads[.1], Arrow[{{4, 3/2}, {0, 3/2}, {0, 0}}], Black, AbsoluteDashing[{10, 20}], Line[{{-1, 0}, {4, 0}}]}] Does that help?

Maybe this is what you want:

gr = Graphics[(* your graphics *)];
AbsoluteOptions[gr]

EDIT:

Probably better is to avoid directives like Large at all, e.g.:

Graphics[{AbsoluteThickness[3], Green, Rectangle[{0, -1}, {2, 1}], 
  Red, Disk[], Blue, Circle[{2, 0}], Yellow, 
  Polygon[{{2, 0}, {4, 1}, {4, -1}}], Purple, Arrowheads[.1], 
  Arrow[{{4, 3/2}, {0, 3/2}, {0, 0}}], Black, 
  AbsoluteDashing[{10, 20}], Line[{{-1, 0}, {4, 0}}]}]

Does that help?

POSTED BY: Henrik Schachner

Mirek M

Posted 5 years ago

Thank you for your advice. AbsoluteOptions[gr] in this case doesn't work because Thickness[Large] is not Options. AbsoluteOptions get numerical value for Axes, Frame, Ticks ... but not for graphics primitives. I agree with you that better is not to use directives like Large, Tiny, ...

POSTED BY: Mirek M

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