Drawing in color

Page 5

Why does the turtle only draw with a black pen? Always drawing with the same color is boring. That's why he has more than one pen. He has 16 pens, all in different colors! He has numbered them 0 to 15. These are the colors of the pens:

All Logo's pens

Why does the turtle call the first pen number 0 and not number 1? He just likes to start counting at 0. He's a little strange that way, but he has his reasons.

Now let's change pen. Tell the turtle SETPC and then a number between 0 and 15. For example, if we write:

SETPC 3
FD 100
RT 90
SETPC 4
FD 100
RT 90
SETPC 1
FD 100
RT 90
SETPC 12
FD 100
RT 90

Then he draws this:

A colored box

Now you can draw in color too! You can draw green grass. And blue water. And other colored things. Think of something in color that you like. Then try to draw it.

These are all the words we have learnt now. SETPC is new:

Logo word What it means
FD 100 Walk forward 100 steps
BK 100 Walk backward 100 steps
LT 90 Turn left (good for drawing squares)
RT 90 Turn right (good for drawing squares)
LT 120 Turn left (good for drawing triangles)
RT 120 Turn right (good for drawing triangles)
CS Remove everything you have drawn
HOME Move back to the starting point (and draw a line)
PU Lift the pen so you won't draw when you walk
PD Put the pen towards the screen again
REPEAT 10 [       ] Repeat what's in the box 10 times
SETPC 4 Change the pen to pen number 4

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