Turtle Pen Commands
from: http://en.flossmanuals.net/TurtleArt/PenCommands
Click on the tab for the pen to see the following tools:
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pu = pen up – Picks up the pen so that the turtle does not draw.
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pd = pen down – Puts the pen down so that the turtle can draw.
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Set pensize – Sets the width of the pen. The larger the number the fatter the line.
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Set color – Sets the color of the line that will be drawn. The value can be 0 to 99. See the table for colors.
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Set shade – Sets the brightness of the color. 0 will make it blacker. 99 will make it whiter.The example shows color 0 at shade of 0, 50 and 99.
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Fill screen – Fills the entire screen with the color and shade shown.
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