Functional Problem Solving (CSC 151 2014F) : Reference
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Sections: [Assignments] [EBoards] [Examples] [Handouts] [Labs] [Outlines] [Readings]
Reference: [Setup] - [Functions A-Z] [Functions By Topic] - [Racket] [Scheme Report (R5RS)] [R6RS] [TSPL4]
Related Courses: [Davis (2013F)] [Rebelsky (2014S)] [Weinman (2014F)]
Misc: [Submit Questions] - [SamR] [Glimmer Labs] [CS@Grinnell] [Grinnell] - [Issue Tracker (Course)]
(turtle-new
image
)
image
.
(turtle-clone
turtle
)
turtle
(same position, direction, color, brush, etc.).
(turtle-forward!
turtle
distance
)
turtle
forward by the specified distance.
(turtle-teleport!
turtle
col
row
)
turtle
to
(col
,row
).
Do not draw along the way.
(turtle-face!
turtle
angle
)
turtle
face the direction specified by
angle
(clockwise
from right).
(turtle-turn!
turtle
angle
)
turtle
clockwise by
angle
degrees.
(turtle-down!
turtle
)
turtle
's brush down. When the turtle
moves forward, it draws with the brush.
(turtle-up!
turtle
)
turtle
's brush. When
turtle
moves forward, it
will not draw.
(turtle-set-brush!
turtle
brush
)
turtle
draws with.
(turtle-set-brush!
turtle
brush
size
)
turtle
draws with. The brush must
be one of the resizable brushes.
(turtle-set-color!
turtle
color
)
turtle
draws.
(turtle-angle
turtle
)
(turtle-point
turtle
)
(turtle-row
turtle
)
(turtle-world
turtle
)
turtle
resides.
(turtle-brush
turtle
)
(turtle-brush-size
turtle
)
(turtle-color
turtle
)
(turtle-show!
turtle
angle
)
turtle
visible, so that it is
displayed after each call to
turtle-forward!
,
turtle-turn!
,
turtle-teleport!
, and
turtle-face!
.
Visible turtles are generally much slower.
Useful primarily for novices and for generating interesting
patterns.
(turtle-hide!
turtle
angle
)
turtle
invisible, so that it is
not displayed. (That is, undoes turtle-show!
.)