描述Regular polygon 13 annotated.svg	English: Regular tridecagon (triscaidecagon) with annotation.
日期	2013年7月19日, 12:24:18
来源	自己的作品
作者	László Németh
其他版本	Regular 3-gon Regular 4-gon Regular 5-gon Regular 6-gon Regular 7-gon Regular 8-gon Regular 9-gon Regular 10-gon Regular 11-gon Regular 12-gon Regular 13-gon Regular 14-gon Regular 15-gon Regular 16-gon Regular 17-gon Regular 18-gon Regular 19-gon Regular 20-gon
SVG开发 InfoField	该SVG的源代码为有效代码。   本矢量图使用OpenOffice.org创作。

; Created in LibreOffice 4 with this LibreLogo program.
; Usage: Copy it in an English language document in LibO Writer,
; and click on the Start icon of the View»Toolbar»Logo toolbar.

TO superior num prevnum
  s = “”
  FOR i IN STR num [
    s = s + “⁰¹²³⁴⁵⁶⁷⁸⁹”[INT i]
  ]
  IF NOT prevnum % 10 = 1 [ s = “ ” + s ] ; narrow space
  OUTPUT s
END

TO inferior num
  s = “”
  FOR i IN STR num [
    s = s + “₀₁₂₃₄₅₆₇₈₉”[INT i]
  ]
  OUTPUT s
END

CLEARSCREEN HIDETURTLE FONTSIZE 18 FONTFAMILY “DejaVu Sans”
FOR vertices IN [7, 11, 13, 14, 16, 17, 19] [
;    PICTURE “poly/regular_polygon_%d_annotated.svg” % vertices [ ; from LibO 4.1.1
    PICTURE [
        HOME FILLCOLOR “WHITE” PENCOLOR “SILVER” 
        PENDOWN PENSIZE 2 CIRCLE 400
        β = 360/vertices
        q = vertices // 4
        CIRCLE [80 + vertices * 14, 80 + vertices * 14, β * q, β * (q + 1)]
        FONTCOLOR “SILVER”
        IF vertices > 18 [ f = 0.004 ] [ f = 0.005 ]
        HEADING β * q + β * 0.5 PENUP
        FORWARD (80 + vertices * 14) * (0.3 + (f * vertices))
        HEADING 0
	  s1 = superior (360 % vertices, 360 // vertices)
        s2 = inferior vertices
        LABEL “%d%s⁄%s°” % (β, s1, s2)
        HOME HEADING 0 PENDOWN
        dots = []
        REPEAT vertices [
                FORWARD 200
                where = POSITION
                dots = dots + [where]
                BACK 200 RIGHT β
        ]
        HOME PENSIZE 2 CIRCLE 10
        PENCOLOR “BLACK” FONTCOLOR “BLACK”
        α = ((vertices-2)/vertices)*180
        PENUP FORWARD 200 PENDOWN
        CIRCLE [100 + 105/vertices, 100 + 105/vertices, 180 – α/2, 180 + α/2]
	  s1 = superior ((vertices-2) * 180 % vertices, INT α)
        PENUP BACK 20 + 70/vertices LABEL “%d%s⁄%s°” %  (α, s1, s2)
        HOME PENUP PENSIZE 4 PENUP
        FOR i IN dots + dots[0:1] [ POSITION i PENDOWN ] PENSIZE 2
        FOR i IN dots [ PENUP POSITION i PENDOWN CIRCLE 10 ]
    ]
]

László Németh，本作品著作权人，特此采用以下许可协议发表本作品：

	本作品采用知识共享CC0 1.0 通用公有领域贡献许可协议授权。
	采用本宣告发表本作品的人，已在法律允许的范围内，通过在全世界放弃其对本作品拥有的著作权法规定的所有权利（包括所有相关权利），将本作品贡献至公有领域。您可以复制、修改、传播和表演本作品，将其用于商业目的，无需要求授权。 http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse