Vtech Power Zone Edge User Manual - Page 36

clearscreen (cs) erase the graphics screen, returns the turtle to the centre of the screen, and sets the turtle's heading to 0. CLEARSCREEN does not affect the pen state or screen colours. xcor output the X coordinate of the turtle. ycor output the Y coordinate of the turtle. heading output the turtle's degree. turtlestate (ts) output 4 turtle properties: pen down? turtle visible? background colour pen colour wrap make the turtle remain inside the graphics window no matter how large a movement command is given. Any time the turtle moves off the window borders, it wraps around the window and reappears on the opposite edge. window remove the boundaries from the turtle's field of movement. If the turtle moves beyond the borders of the graphics window, it continues to move, but cannot be seen. fence prevent the turtle from moving beyond the edge of the graphics window. If you try to move the turtle off the window, it does not move and Logo displays a message. 2. Mathematics Commands abs n output the absolute value of its input. arctan n output the arctangent of its input. cos n output the cosine of its input. expn n calculate the natural base e (2.71828. . .) raised to the power specified by its input. int n output the integer portion of its input by removing the decimal portion, if any. No rounding occurs. log n output the natural logarithm of its input. log10 n output the base 10 logarithm of its input. product m n output the product of its inputs. PRODUCT expects two inputs, but will accept more if it and all its inputs are enclosed in parentheses. quotient m n output the result of dividing the first input by the second input. random n output a randomly selected number from 1 through its input. 28