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Turtle graphics are often associated with the Logo programming language. [2] Seymour Papert added support for turtle graphics to Logo in the late 1960s to support his version of the turtle robot, a simple robot controlled from the user's workstation that is designed to carry out the drawing functions assigned to it using a small retractable pen set into or attached to the robot's body.
The first working Logo turtle robot was created in 1969. A display turtle preceded the physical floor turtle. Modern Logo has not changed very much from the basic concepts predating the first turtle. The first turtle was a tethered floor roamer, not radio-controlled or wireless. At BBN Paul Wexelblat developed a turtle named Irving that had ...
The algorithm that draws the spiral (in pseudocode): f(.01, 89.5, .01, 184) f( dist , angle , incr , segs /*(number of segments)*/) { start in the center of a square view-space, facing east repeat segs times: go dist * (60% the view-space width) in the current direction turn angle degrees clockwise (to your right) increment dist by incr }
The curve that has a catacaustic forming a circle. Approximates the Archimedean spiral. [11] Atomic spiral: 2002 = This spiral has two asymptotes; one is the circle of radius 1 and the other is the line = [12] Galactic spiral: 2019
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An Archimedean spiral is, for example, generated while coiling a carpet. [5] A hyperbolic spiral appears as image of a helix with a special central projection (see diagram). A hyperbolic spiral is some times called reciproke spiral, because it is the image of an Archimedean spiral with a circle-inversion (see below). [6]
A logarithmic spiral, equiangular spiral, or growth spiral is a self-similar spiral curve that often appears in nature. The first to describe a logarithmic spiral was Albrecht Dürer (1525) who called it an "eternal line" ("ewige Linie").
Long dragon or mang dragon: 3-clawed dragons/ 4-clawed dragons, also called mang (蟒, lit. "python")/ 5-clawed dragons Zhenglong (正龙)/ sitting dragon Lilong (立龙)/ standing dragon Shenglong (升龙) / ascending dragon Jianglong (降龙)/ descending dragon Xinglong (行龙)/ travelling dragon Dragon playing with pearl