You also have a monitor, CURR-COLOR-SEP, which will display that variable's value, so that you know when it has been altered, and by how much. The INCREASE-COLOR? switch determines if CURR-COLOR-SEP is increased (true) or decreased (false). This number is changed by a small random amount. Thus the slider value itself isn't changed, but the number the turtles look at is constantly changing. The COLOR-SHIFT button will either increment or decrement the value of COLOR-SEP used by the turtles - saved internally as CURR-COLOR-SEP. PATTERN-1 has the arms of the kaleidoscope all spiraling clockwise, while PATTERN-2 has the arms of the kaleidoscope spiral in both clockwise and counterclockwise directions, giving a slightly more complicated design.įinally, you have the power to change the color distribution exhibited by this model. Each pattern has its own forever-button that controls it. When you have set both NUM-TURTLES and COLOR-SEP, press the SETUP button to get your model ready for drawing. This inverse relation between COLOR-SEP and the color range is due to the fact that COLOR-SEP acts as a constant to divide a turtle's color by. For a nice, three-colored kaleidoscope, set COLOR-SEP to 25. The higher the value, the smaller the range. COLOR-SEP determines the range of colors that the turtles (and hence the kaleidoscope) will take on. Begin by setting this slider to the desired value (10 is fine). The NUM-TURTLES slider really determines the number of "arms" or "petals" that the kaleidoscope will have. While there are two built-in patterns for the model, both follow the same set of rules, with the only difference being that half of the drawing turtles in PATTERN-2 draw circles counterclockwise while all of the turtles in PATTERN-1 draw circles clockwise. In between hatchings, the only thing the original turtles are doing is slowly rotating. At each tick, every original turtle hatches a new "drawing turtle" whose only job is to draw a circle and then immediately die. A number of turtles are created with their pen's down (wherever they move, they will draw a trail). The inner workings of the model are quite simple. It is a demonstration of how a set of simple agent rules can give rise to complex and beautiful patterns.
This model uses NetLogo turtles to repeatedly draw circles, turning periodically so that the display gives the impression of a kaleidoscope or pinwheel. You can also Try running it in NetLogo Web
#Kaleidoscope drawing simple download#
If you download the NetLogo application, this model is included. Beginners Interactive NetLogo Dictionary (BIND)
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