Cart on a Ramp

while

a command that takes a reporter and a set of commands as input and runs the commands repeatedly as long as the reporter reports true; if the reporter ever reports false, it stops repeating the commands

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turtles-on

a reporter that takes a set of agents (patches or turtles) as input and reports a set of all the turtles that are on (or standing on) the same patch(es)

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tan

a reporter that takes an angle (a number) as input and reports the tangent of that angle

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show

a command that takes a value as input and prints that value in the Command Center

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pen-size

a built-in turtle variable that holds the width of the line that the turtle will draw (or erase)

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pen-down, pen-erase, pen-up

a command that changes turtle’s mode to drawing lines (pen-down), removing lines (pen-erase), or neither (pen-up)

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patch-ahead

a reporter that takes a distance (a number) as input and reports the patch that is that distance ahead of the current turtle (along the turtle’s current heading)

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