Issue #7061: Added a 'Turtle star' sidebar
This commit is contained in:
Alexander Belopolsky
parent
922e904cca
commit
14fb79977b
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from turtle import *
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color('red', 'yellow')
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begin_fill()
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while True:
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forward(200)
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left(170)
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if abs(pos()) < 1:
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break
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end_fill()
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done()
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Binary file not shown.
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After Width: | Height: | Size: 39 KiB |
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@ -0,0 +1,447 @@
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%!PS-Adobe-3.0 EPSF-3.0
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%%Creator: Tk Canvas Widget
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%%For: Alexander Belopolsky
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%%Title: Window .4315905424
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%%CreationDate: Tue Nov 9 12:54:06 2010
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%%XBoundingBox: -172 -52 785 845
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%%BoundingBox: 290 290 520 520
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%%Pages: 1
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%%DocumentData: Clean7Bit
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%%Orientation: Portrait
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%%EndComments
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%%BeginProlog
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/CurrentEncoding [
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/space/space/space/space/space/space/space/space
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/space/space/space/space/space/space/space/space
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/space/space/space/space/space/space/space/space
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/space/space/space/space/space/space/space/space
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/space/exclam/quotedbl/numbersign/dollar/percent/ampersand/quotesingle
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/parenleft/parenright/asterisk/plus/comma/hyphen/period/slash
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/zero/one/two/three/four/five/six/seven
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/eight/nine/colon/semicolon/less/equal/greater/question
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/at/A/B/C/D/E/F/G
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/H/I/J/K/L/M/N/O
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/P/Q/R/S/T/U/V/W
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/X/Y/Z/bracketleft/backslash/bracketright/asciicircum/underscore
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/grave/a/b/c/d/e/f/g
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/h/i/j/k/l/m/n/o
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/p/q/r/s/t/u/v/w
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/x/y/z/braceleft/bar/braceright/asciitilde/space
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/space/space/space/space/space/space/space/space
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/space/space/space/space/space/space/space/space
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/space/space/space/space/space/space/space/space
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/space/space/space/space/space/space/space/space
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/space/exclamdown/cent/sterling/currency/yen/brokenbar/section
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/dieresis/copyright/ordfeminine/guillemotleft/logicalnot/hyphen/registered/macron
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/degree/plusminus/twosuperior/threesuperior/acute/mu/paragraph/periodcentered
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/cedilla/onesuperior/ordmasculine/guillemotright/onequarter/onehalf/threequarters/questiondown
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/Agrave/Aacute/Acircumflex/Atilde/Adieresis/Aring/AE/Ccedilla
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/Egrave/Eacute/Ecircumflex/Edieresis/Igrave/Iacute/Icircumflex/Idieresis
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/Eth/Ntilde/Ograve/Oacute/Ocircumflex/Otilde/Odieresis/multiply
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/Oslash/Ugrave/Uacute/Ucircumflex/Udieresis/Yacute/Thorn/germandbls
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/agrave/aacute/acircumflex/atilde/adieresis/aring/ae/ccedilla
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/egrave/eacute/ecircumflex/edieresis/igrave/iacute/icircumflex/idieresis
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/eth/ntilde/ograve/oacute/ocircumflex/otilde/odieresis/divide
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/oslash/ugrave/uacute/ucircumflex/udieresis/yacute/thorn/ydieresis
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] def
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50 dict begin
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% This is a standard prolog for Postscript generated by Tk's canvas
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% widget.
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% RCS: @(#) $Id$
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% The definitions below just define all of the variables used in
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% any of the procedures here. This is needed for obscure reasons
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% explained on p. 716 of the Postscript manual (Section H.2.7,
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% "Initializing Variables," in the section on Encapsulated Postscript).
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/baseline 0 def
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/stipimage 0 def
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/height 0 def
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/justify 0 def
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/lineLength 0 def
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/spacing 0 def
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/stipple 0 def
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/strings 0 def
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/xoffset 0 def
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/yoffset 0 def
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/tmpstip null def
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/cstringshow {
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{
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dup type /stringtype eq
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{ show } { glyphshow }
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ifelse
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}
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forall
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} bind def
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/cstringwidth {
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0 exch 0 exch
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{
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dup type /stringtype eq
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{ stringwidth } {
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currentfont /Encoding get exch 1 exch put (\001) stringwidth
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}
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ifelse
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exch 3 1 roll add 3 1 roll add exch
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}
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forall
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} bind def
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% font ISOEncode font
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% This procedure changes the encoding of a font from the default
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% Postscript encoding to current system encoding. It's typically invoked just
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% before invoking "setfont". The body of this procedure comes from
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% Section 5.6.1 of the Postscript book.
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/ISOEncode {
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dup length dict begin
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{1 index /FID ne {def} {pop pop} ifelse} forall
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/Encoding CurrentEncoding def
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currentdict
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end
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% I'm not sure why it's necessary to use "definefont" on this new
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% font, but it seems to be important; just use the name "Temporary"
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% for the font.
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/Temporary exch definefont
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} bind def
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% StrokeClip
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%
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% This procedure converts the current path into a clip area under
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% the assumption of stroking. It's a bit tricky because some Postscript
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% interpreters get errors during strokepath for dashed lines. If
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% this happens then turn off dashes and try again.
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/StrokeClip {
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{strokepath} stopped {
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(This Postscript printer gets limitcheck overflows when) =
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(stippling dashed lines; lines will be printed solid instead.) =
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[] 0 setdash strokepath} if
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clip
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} bind def
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% desiredSize EvenPixels closestSize
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%
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% The procedure below is used for stippling. Given the optimal size
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% of a dot in a stipple pattern in the current user coordinate system,
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% compute the closest size that is an exact multiple of the device's
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% pixel size. This allows stipple patterns to be displayed without
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% aliasing effects.
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/EvenPixels {
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% Compute exact number of device pixels per stipple dot.
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dup 0 matrix currentmatrix dtransform
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dup mul exch dup mul add sqrt
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% Round to an integer, make sure the number is at least 1, and compute
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% user coord distance corresponding to this.
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dup round dup 1 lt {pop 1} if
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exch div mul
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} bind def
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% width height string StippleFill --
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%
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% Given a path already set up and a clipping region generated from
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% it, this procedure will fill the clipping region with a stipple
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% pattern. "String" contains a proper image description of the
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% stipple pattern and "width" and "height" give its dimensions. Each
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% stipple dot is assumed to be about one unit across in the current
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% user coordinate system. This procedure trashes the graphics state.
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/StippleFill {
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% The following code is needed to work around a NeWSprint bug.
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/tmpstip 1 index def
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% Change the scaling so that one user unit in user coordinates
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% corresponds to the size of one stipple dot.
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1 EvenPixels dup scale
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% Compute the bounding box occupied by the path (which is now
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% the clipping region), and round the lower coordinates down
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% to the nearest starting point for the stipple pattern. Be
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% careful about negative numbers, since the rounding works
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% differently on them.
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pathbbox
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4 2 roll
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5 index div dup 0 lt {1 sub} if cvi 5 index mul 4 1 roll
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6 index div dup 0 lt {1 sub} if cvi 6 index mul 3 2 roll
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% Stack now: width height string y1 y2 x1 x2
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% Below is a doubly-nested for loop to iterate across this area
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% in units of the stipple pattern size, going up columns then
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% across rows, blasting out a stipple-pattern-sized rectangle at
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% each position
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6 index exch {
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2 index 5 index 3 index {
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% Stack now: width height string y1 y2 x y
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gsave
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1 index exch translate
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5 index 5 index true matrix tmpstip imagemask
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grestore
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} for
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pop
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} for
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pop pop pop pop pop
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} bind def
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% -- AdjustColor --
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% Given a color value already set for output by the caller, adjusts
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% that value to a grayscale or mono value if requested by the CL
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% variable.
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/AdjustColor {
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CL 2 lt {
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currentgray
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CL 0 eq {
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.5 lt {0} {1} ifelse
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} if
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setgray
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} if
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} bind def
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% x y strings spacing xoffset yoffset justify stipple DrawText --
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% This procedure does all of the real work of drawing text. The
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% color and font must already have been set by the caller, and the
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% following arguments must be on the stack:
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%
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% x, y - Coordinates at which to draw text.
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% strings - An array of strings, one for each line of the text item,
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% in order from top to bottom.
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% spacing - Spacing between lines.
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% xoffset - Horizontal offset for text bbox relative to x and y: 0 for
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% nw/w/sw anchor, -0.5 for n/center/s, and -1.0 for ne/e/se.
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% yoffset - Vertical offset for text bbox relative to x and y: 0 for
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% nw/n/ne anchor, +0.5 for w/center/e, and +1.0 for sw/s/se.
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% justify - 0 for left justification, 0.5 for center, 1 for right justify.
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% stipple - Boolean value indicating whether or not text is to be
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% drawn in stippled fashion. If text is stippled,
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% procedure StippleText must have been defined to call
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% StippleFill in the right way.
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%
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% Also, when this procedure is invoked, the color and font must already
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% have been set for the text.
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/DrawText {
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/stipple exch def
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/justify exch def
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/yoffset exch def
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/xoffset exch def
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/spacing exch def
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/strings exch def
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% First scan through all of the text to find the widest line.
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/lineLength 0 def
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strings {
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cstringwidth pop
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dup lineLength gt {/lineLength exch def} {pop} ifelse
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newpath
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} forall
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% Compute the baseline offset and the actual font height.
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0 0 moveto (TXygqPZ) false charpath
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pathbbox dup /baseline exch def
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exch pop exch sub /height exch def pop
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newpath
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% Translate coordinates first so that the origin is at the upper-left
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% corner of the text's bounding box. Remember that x and y for
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% positioning are still on the stack.
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translate
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lineLength xoffset mul
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strings length 1 sub spacing mul height add yoffset mul translate
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% Now use the baseline and justification information to translate so
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% that the origin is at the baseline and positioning point for the
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% first line of text.
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justify lineLength mul baseline neg translate
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% Iterate over each of the lines to output it. For each line,
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% compute its width again so it can be properly justified, then
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% display it.
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strings {
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dup cstringwidth pop
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justify neg mul 0 moveto
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stipple {
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% The text is stippled, so turn it into a path and print
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% by calling StippledText, which in turn calls StippleFill.
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% Unfortunately, many Postscript interpreters will get
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% overflow errors if we try to do the whole string at
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% once, so do it a character at a time.
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gsave
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/char (X) def
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{
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dup type /stringtype eq {
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% This segment is a string.
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{
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char 0 3 -1 roll put
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currentpoint
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gsave
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char true charpath clip StippleText
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grestore
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char stringwidth translate
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moveto
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} forall
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} {
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% This segment is glyph name
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% Temporary override
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currentfont /Encoding get exch 1 exch put
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currentpoint
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gsave (\001) true charpath clip StippleText
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grestore
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(\001) stringwidth translate
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moveto
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} ifelse
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} forall
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grestore
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} {cstringshow} ifelse
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0 spacing neg translate
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} forall
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} bind def
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%%EndProlog
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%%BeginSetup
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/CL 2 def
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%%EndSetup
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%%Page: 1 1
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save
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306.0 396.0 translate
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0.9995 0.9995 scale
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4 -449 translate
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-483 898 moveto 475 898 lineto 475 0 lineto -483 0 lineto closepath clip newpath
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gsave
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grestore
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gsave
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0 445 moveto
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200 445 lineto
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3.03844939755837 479.729635533386 lineto
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-1.70530256582424e-13 445 lineto
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0 445 lineto
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1.000 1.000 0.000 setrgbcolor AdjustColor
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eofill
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grestore
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gsave
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0 445 moveto
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200 445 lineto
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3.03844939755837 479.729635533386 lineto
|
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190.97697355474 411.325606868252 lineto
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17.7718927978523 511.325606868252 lineto
|
||||
170.980781421648 382.768084930944 lineto
|
||||
42.42325948434 535.97697355474 lineto
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142.42325948434 362.771892797852 lineto
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74.0192308192062 550.710416955034 lineto
|
||||
108.748866352592 353.748866352592 lineto
|
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108.748866352592 553.748866352592 lineto
|
||||
74.0192308192064 356.787315750151 lineto
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||||
142.42325948434 544.725839907333 lineto
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||||
42.4232594843401 371.520759150445 lineto
|
||||
170.980781421648 524.72964777424 lineto
|
||||
17.7718927978524 396.172125836932 lineto
|
||||
190.97697355474 496.172125836933 lineto
|
||||
3.03844939755834 427.768097171799 lineto
|
||||
200 462.497732705185 lineto
|
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-1.13686837721616e-13 462.497732705185 lineto
|
||||
196.961550602442 427.768097171799 lineto
|
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9.02302644525972 496.172125836932 lineto
|
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182.228107202148 396.172125836933 lineto
|
||||
29.0192185783518 524.72964777424 lineto
|
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157.57674051566 371.520759150445 lineto
|
||||
57.5767405156596 544.725839907332 lineto
|
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125.980769180794 356.787315750151 lineto
|
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91.2511336474073 553.748866352592 lineto
|
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91.2511336474079 353.748866352592 lineto
|
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125.980769180793 550.710416955034 lineto
|
||||
57.5767405156601 362.771892797852 lineto
|
||||
157.57674051566 535.97697355474 lineto
|
||||
29.0192185783522 382.768084930944 lineto
|
||||
182.228107202148 511.325606868253 lineto
|
||||
9.02302644525994 411.325606868252 lineto
|
||||
196.961550602442 479.729635533386 lineto
|
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-1.70530256582424e-13 445 lineto
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1 setlinecap
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1 setlinejoin
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1 setlinewidth
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[] 0 setdash
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1.000 0.000 0.000 setrgbcolor AdjustColor
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stroke
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grestore
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gsave
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grestore
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gsave
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-1.70530256582424e-13 445 moveto
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-9.00000000000019 450 lineto
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-7.00000000000017 445 lineto
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-9.00000000000015 440 lineto
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-1.70530256582424e-13 445 lineto
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1.000 1.000 0.000 setrgbcolor AdjustColor
|
||||
eofill
|
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-1.70530256582424e-13 445 moveto
|
||||
-9.00000000000019 450 lineto
|
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-7.00000000000017 445 lineto
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-9.00000000000015 440 lineto
|
||||
-1.70530256582424e-13 445 lineto
|
||||
1 setlinejoin 1 setlinecap
|
||||
1 setlinewidth
|
||||
[] 0 setdash
|
||||
1.000 0.000 0.000 setrgbcolor AdjustColor
|
||||
stroke
|
||||
grestore
|
||||
restore showpage
|
||||
|
||||
%%Trailer
|
||||
end
|
||||
%%EOF
|
||||
|
||||
|
|
@ -23,6 +23,16 @@ command ``turtle.forward(15)``, and it moves (on-screen!) 15 pixels in the
|
|||
direction it is facing, drawing a line as it moves. Give it the command
|
||||
``turtle.left(25)``, and it rotates in-place 25 degrees clockwise.
|
||||
|
||||
.. sidebar:: Turtle star
|
||||
|
||||
Turtle can draw intricate shapes using programs that repeat simple
|
||||
moves.
|
||||
|
||||
.. image:: turtle-star.*
|
||||
:align: center
|
||||
|
||||
.. literalinclude:: ../includes/turtle-star.py
|
||||
|
||||
By combining together these and similar commands, intricate shapes and pictures
|
||||
can easily be drawn.
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue