Programming with MSWlogo

MSWLogo is an interpreter language based on Logo, with a GUI front end. Its core is the same as UCBLogo by Brian Harvey. It is free software, with source available, in Borland C++.

The Turtle:

Why a "Turtle"? - The original idea behind Logo was that a small robot device would be connected to the computer and made to move around the floor, drawing as it goes. The first such robot was a domed perspex device with wheels. It’s domed "shell' made it look like an electronic turtle. The robot 'turtle' has evolved into a graphical turtle on the screen. In some logos a representation of a turtle remains as the 'pointer'. In MSW Logo it has been reduced to a triangular pointer.

Logo Commands:

Command	Abbreviation	Result
FORWARD n	FD	moves the turtle forward n units
BACK n	BK	moves the turtle back n units
RIGHT n	RT	turns the turtle n degrees to the right
LEFT n	LT	turns the turtle n degrees to the left
HOME	none	Returns the turtle to its origin
CLEARSCREEN	CS	Erases the screen
HIDETURTLE	HT	Hide the turtle
SHOWTURTLE	ST	Show the turtle
REPEAT n[commands]	none	Repeats the commands n times
PENUP	PU	Lifts the pen as the turtle moves. The turtle stops drawing.
PENDOWN	PD	The turtle continues to draw as it moves.
PENERASE	PE	Sets the pen's position to DOWN and the mode to erase.
PENPAINT	PPT	Sets the pen's position to DOWN and the mode to PAINT. (PAINT is the normal mode.)
SETPENCOLOR [Red, Green, Blue]	setPC	Changes the pencolor. eg SETPENCOLOR [255, 0, 0] = Red, SETPENCOLOR [0, 255,0] = Green, SETPENCOLOR [0, 0, 255] = Blue

Things can do with logo:

Move multiple turtles at once

Produce fonts

Color objects

Cut and paste

Give status reports

Make sounds

Work in 3D and view in 3D

Create solids

MSWLogo in an interpreter of Logo programming language. This easy to use language was created for educational matters. Its interface is simple and easy to use. With a window where may see the outcome of our program, and another one for introducing commands. The programs allows to introduce changes in the way that graphics are created (the color and width of each stroke, and the size and type of foundation, etc.). Also it lets you adjust the area that is visible,

Programming with MSW Logo

Triangle

Repeat 3[fd 200 rt 120]

Hexagon

Repeat 6[fd 200 rt 60]

Square

Repeat 4[fd 200 rt 90]   

Rectangle

Repeat 2[fd 100 rt 90 fd 200 rt 90]

Figure 1

rt 45

fd 250

setpc 3

repeat 4[rt 90 fd 100]

setpc 0

bk 250

rt 45

pu fd 100

lt 135

pd fd 250

setpc 5

repeat 4[rt 90 fd 100]

setpc 0

bk 250

                                                              Figure 2

setpc 2

Repeat 4[fd 100 rt 90]

setpc 13

Repeat 4[fd 200 rt 90]

setpc 4

Repeat 4[fd 300 rt 90]