LibreLogo

LibreLogo is a simple, localized, Logo-like programming environment with turtle vector graphics for teaching of computing (programming and word processing), DTP and graphic design. See http://www.numbertext.org/logo/librelogo.pdf.

Панель инструментов LibreLogo

The LibreLogo toolbar (View - Toolbars - Logo) contains turtle moving, program start, stop, home, clear screen, program editor/syntax highlighting/translating icons and an input bar (command line).

Turtle moving icons

They are equivalents of the Logo commands “FORWARD 10”, “BACK 10”, “LEFT 15”, “RIGHT 15”. Clicking on one of the icons will also focus the turtle shape scrolling the page to its position.

Start Logo program

Click on the icon “Start Logo program” to execute the text (or only the selected) text of the Writer document as a LibreLogo program. In an empty document an example program will be inserted and executed.

Нажмите на кнопку "Стоп" для остановки выполнения программы.

Home

Click on the icon “Home” to reset the position and settings of the turtle.

Oчистить экран

Щёлкните значок «Очистить экран», чтобы удалить рисунки документа.

Редактор программ/Подсветка синтаксиса/Перевод

The “magic wand” icon sets 2-page layout for program editing, expands and converts to uppercase the abbreviated, lowercase Logo commands in the Writer document. Change the language of the document ( - Languages and Locales - General - Western) and click on this icon to translate the Logo program to the selected language.

Kомандная строка

Нажмите Enter в командной строке, чтобы выполнить её содержимое. Для остановки программы используйте значок «Стоп».

Удерживайте клавишу Enter для повторения командной строки, например, для следующих команд:

 FORWARD 200 LEFT 89

Чтобы сбросить командную строку, трижды щёлкните по ней или нажмите +A для выбора предыдущих и ввода новых команд.

Graphical user interface of basic turtle settings

Turtle shape of LibreLogo is a normal fixed size drawing object. You can position and rotate it on standard way, too, using the mouse and the Rotate icon of the Drawing Object Properties toolbar. Modify Line Thickness, Line Color and Area Color settings of the turtle shape to set PENSIZE, PENCOLOR and FILLCOLOR attributes of LibreLogo.

Редактирование программы

LibreLogo drawings and programs use the same Writer document. The LibreLogo canvas is on the first page of the Writer document. You can insert a page break before the LibreLogo programs and set page zoom using the “magic wand” icon of the Logo toolbar, also change the font size for a comfortable 2-page layout for LibreLogo programming: left (first) page is the canvas, right (second) page is the LibreLogo program editor.

Язык программирования LibreLogo

LibreLogo is an easily localizable, Logo-like programming language, localized in several languages by LibreOffice native language communities. It is back-compatible with the older Logo systems in the case of the simple Logo programs used in education, eg.

 TO triangle :size
REPEAT 3 [
FORWARD :size
LEFT 120
]
END

triangle 10 triangle 100 triangle 200

Отличия от языка программирования Logo

Другие возможности LibreLogo

Команды LibreLogo

Синтаксис Basic

Регистрозависимость

Commands, color constants are case insensitive:

 PRINT “Hello, World!”
print “Hello, World, again!”

Variable names are case sensitive:

 a = 5
A = 7
PRINT a
PRINT A

Program lines

Lines of a LibreLogo program are paragraphs in the Writer document. A program line can contain multiple commands:

 PRINT “Hello, World!” PRINT “LibreLogo”

Комментарии

Lines or line parts are comments from a semicolon to the end of the line (paragraph):

 ; some comments
PRINT 5 * 5 ; some comments

Break program lines to multiple paragraphs

It’s possible to break a program line for more paragraphs using the character tilde at the end of the line:

 PRINT “This is a very long ” + ~
“warning message”

Turtle moving

ВПЕРЁД (в)

 FORWARD 10 ; move forward 10pt (1pt = 1/72 inch)
FORWARD 10pt ; see above
FORWARD 0.5in ; move forward 0.5 inch (1 inch = 2.54 cm)
FORWARD 1" ; see above
FD 1mm
FD 1cm

НАЗАД (н)

 BACK 10 ; move back 10pt

ВЛЕВО (л)

 LEFT 90 ; turn counterclockwise 90 degrees
LEFT 90° ; see above
LT 3h ; see above (clock position)
LT any ; turn to a random position

ВПРАВО (п)

 RIGHT 90 ; turn clockwise 90 degrees

ПОДНЯТЬ_ПЕРО (пп)

 PENUP ; turtle will move without drawing

ОПУСТИТЬ_ПЕРО (оп)

 PENDOWN ; turtle will move with drawing

ПОЗИЦИЯ (поз)

 POSITION [0, 0] ; turn and move to the top-left corner
POSITION PAGESIZE ; turn and move to the bottom-right corner
POSITION [PAGESIZE[0], 0] ; turn and move to the top-right corner
POSITION ANY ; turn and move to a random position

ЗАГОЛОВОК (заг)

 HEADING 0 ; turn north
HEADING 12h ; see above
HEADING [0, 0] ; turn to the top-left corner
HEADING ANY ; turn to a random direction

Other turtle commands

СКРЫТЬ_ЧЕРЕПАХУ (сч)

 HIDETURTLE ; hide turtle (until the showturtle command)

ПОКАЗАТЬ_ЧЕРЕПАХУ (пч)

 SHOWTURTLE ; show turtle

HOME

 HOME ; reset initial turtle position

ОЧИСТИТЬ_ЭКРАН (оэ)

 CLEARSCREEN ; remove drawing objects of the document

FILL and CLOSE

 FILL ; close and fill the actual line shape or points
CLOSE ; close the actual line shape or join the actual points

Example: filling a regular triangle:

 FORWARD 50 LEFT 120 FORWARD 50 FILL

Example: drawing a regular triangle:

 FORWARD 50 LEFT 120 FORWARD 50 CLOSE

Pen settings

РАЗМЕР_ПЕРА (тл)

 PENSIZE 100 ; line thickness is 100 points
PENSIZE ANY ; equivalent of PENSIZE RANDOM 10

ЦВЕТ_ПЕРА (ц)

 PENCOLOR “red” ; set red pen color (by color name, see color constants)
PENCOLOR [255, 255, 0] ; set yellow color (RGB list)
PENCOLOR 0xffff00 ; set yellow color (hexa code)
PENCOLOR 0 ; set black color (0x000000)
PENCOLOR ANY ; random color
PENCOLOR [5] ; set red color (by color identifier, see color constants)
PENCOLOR “invisible” ; invisible pen color for shapes without visible outline
PENCOLOR “~red” ; set random red color

ПРОЗР_ПЕРА

 PENTRANSPARENCY 80 ; set the transparency of the actual pen color to 80%

УГОЛ_ПЕРА/УГОЛ_ЛИНИИ

 PENCAP “none” ; without extra line end (default)
PENCAP “round” ; rounded line end
PENCAP “square” ; square line end

СОЕДИНИТЬ_ПЕРО/СОЕДИНИТЬ_ЛИНИИ

 PENJOINT “rounded” ; rounded line joint (default)
PENJOINT “miter” ; sharp line joint
PENJOINT “bevel” ; bevel line joint
PENJOINT “none” ; without line joint

СТИЛЬ_ПЕРА

 PENSTYLE “solid” ; solid line (default)
PENSTYLE “dotted” ; dotted line
PENSTYLE “dashed” ; dashed line

; custom dot–dash pattern specified by a list with the following arguments:
; – number of the neighbouring dots
; – length of a dot
; – number of the neighbouring dashes
; – length of a dash
; – distance of the dots/dashes
; – type (optional):
; 0 = dots are rectangles (default)
; 2 = dots are squares (lengths and distances are relative to the pensize)

PENSTYLE [3, 1mm, 2, 4mm, 2mm, 2] ; ...––...––...––

Fill settings

ЦВЕТ_ЗАЛИВКИ (цз)

 FILLCOLOR “blue” ; fill with blue color, see also PENCOLOR
FILLCOLOR “invisible” CIRCLE 10 ; unfilled circle
FILLCOLOR [“blue”, “red”] ; gradient between red and blue
FILLCOLOR [[255, 255, 255], [255, 128, 0]] ; between white and orange
FILLCOLOR [“blue”, “red”, 1, 0, 0] ; set axial gradient (with the required rotation and border settings), possible values: 0-5 = linear, axial, radial, elliptical, square and rectangle gradients
FILLCOLOR [“red”, “blue”, 0, 90, 20] ; linear with 20% border, rotated with 90 degrees from the actual heading of the turtle
FILLCOLOR [“red”, “blue”, 0, 90, 20, 0, 0, 200, 50] ; from 200% to 50% intensity
FILLCOLOR [ANY, ANY, 2, 0, 0, 50, 50] ; radial gradient with random colors and 50-50% horizontal and vertical positions of the center

ПРОЗР_ЗАЛИВКИ (пз)

 FILLTRANSPARENCY 80 ; set the transparency of the actual fill color to 80%
FILLTRANSPARENCY [80] ; set linear transparency gradient from 80% to 0%
FILLTRANSPARENCY [80, 20] ; set linear transparency gradient from 80% to 20%
FILLTRANSPARENCY [80, 20, 1, 90] ; set axial transparency gradient rotated with 90 degrees from the actual heading of the turtle
FILLTRANSPARENCY [80, 20, 2, 0, 20, 50, 50] ; set radial transparency gradient from outer 80% to inner 20% transparency with 20% border and with 50-50% horizontal and vertical positions of the center

СТИЛЬ_ЗАЛИВКИ

 FILLSTYLE 0 ; fill without hatches (default)
FILLSTYLE 1 ; black single hatches (horizontal)
FILLSTYLE 2 ; black single hatches (45 degrees)
FILLSTYLE 3 ; black single hatches (-45 degrees)
FILLSTYLE 4 ; black single hatches (vertical)
FILLSTYLE 5 ; red crossed hatches (45 degrees)
FILLSTYLE 6 ; red crossed hatches (0 degrees)
FILLSTYLE 7 ; blue crossed hatches (45 degrees)
FILLSTYLE 8 ; blue crossed hatches (0 degrees)
FILLSTYLE 9 ; blue triple crossed
FILLSTYLE 10 ; black wide single hatches (45 degrees)

; custom hatches specified by a list with the following arguments:
; – style (1 = single, 2 = double, 3 = triple hatching)
; – color
; – distance
; – degree

FILLSTYLE [2, “green”, 3pt, 15°] ; green crossed hatches (15 degrees)

Рисунки

КРУГ

 CIRCLE 100 ; draw a circle shape (diameter = 100pt)

ЭЛЛИПС

 ELLIPSE [50, 100] ; draw an ellipse with 50 and 100 diameters
ELLIPSE [50, 100, 2h, 12h] ; draw an elliptical sector (from 2h clock position to 12h)
ELLIPSE [50, 100, 2h, 12h, 2] ; draw an elliptical segment
ELLIPSE [50, 100, 2h, 12h, 3] ; draw an elliptical arc

КВАДРАТ

 SQUARE 100 ; draw a square shape (size = 100pt)

ПРЯМОУГОЛЬНИК

 RECTANGLE [50, 100] ; draw a rectangle shape (50×100pt)
RECTANGLE [50, 100, 10] ; draw a rectangle with rounded corners

ТОЧКА

 POINT ; draw a point with size and color of the pen

CLOSE can join the last points, FILL can fill the shape defined by points. For example, it’s easy to draw a “flat” star starting from its center:

 PENUP
REPEAT 5 [
FORWARD 80
POINT
BACK 80
RIGHT 36
FORWARD 50
POINT
BACK 50
RIGHT 120
] FILL

LABEL

 LABEL “text” ; print text in the turtle position
LABEL 'text' ; see above
LABEL "text ; see above (only for single words)

ТЕКСТ

 CIRCLE 10 TEXT “text” ; set text of the actual drawing object

Font settings

ЦВЕТ_ШРИФТА/ЦВЕТ_ТЕКСТА

 FONTCOLOR “green” ; set font color

СЕМЕЙСТВО_ШРИФТОВ

 FONTFAMILY “Linux Libertine G” ; set font (family)
FONTFAMILY “Linux Libertine G:smcp=1” ; set also font feature (small caps)
FONTFAMILY “Linux Libertine G:smcp=1&onum=1” ; small caps + old figures

КЕГЛЬ

 FONTSIZE 12 ; set 12pt

ТОЛЩИНА_ШРИФТА

 FONTWEIGHT “bold” ; set bold font
FONTWEIGHT “normal” ; set normal weight

СТИЛЬ_ШРИФТА

 FONTSTYLE “italic” ; set italic variant
FONTSTYLE “normal” ; set normal variant

ИЗОБРАЖЕНИЕ (изо)

PICTURE is for

Shape grouping

 ; PICTURE [ LibreLogo_commands ]
PICTURE [ FORWARD 100 CIRCLE 100 ] ; tree-like grouped shape

See also “Group” in LibreOffice Writer Help.

 TO tree location
PENUP POSITION location HEADING 0 PENDOWN
PICTURE [ FORWARD 100 CIRCLE 100 ] ; tree-like grouped shape
END

PICTURE [ tree [230, 400] tree [300, 400] ] ; grouped shapes in a grouped shape

Starting new line shapes

 PICTURE ; start a new line shape
FORWARD 10 PICTURE FORWARD 10 ; two line shapes

Saving SVG images

 PICTURE “example.svg” [ CIRCLE 5 ] ; save the picture as an SVG image file in the user folder
PICTURE “Desktop/example.svg” [ FORWARD 100 CIRCLE 5 ] ; as above, with a relative path
PICTURE “/home/user/example.svg” [ CIRCLE 5 ] ; absolute path for Unix/Linux
PICTURE “C:\example.svg” [ CIRCLE 5 ] ; absolute path for Windows

Saving SVG/SMIL animations (drawings with SLEEP commands)

 PICTURE “animation.svg” [ CIRCLE 5 SLEEP 1000 CIRCLE 99 ] ; save as an SVG/SMIL animation (see also SLEEP)
PICTURE “animation2.svg” [ CIRCLE 5 SLEEP 1000 CIRCLE 99 SLEEP 2000 ] ; as above, but using SLEEP after the last object will result looping: after 2 seconds the SVG animation restarts in SMIL-conformant browsers

Consistency at the left border

Use PICTURE to keep the consistency of positions and line shapes at the left border of Writer:

 PICTURE [ CIRCLE 20 POSITION [-100, 100] CIRCLE 20 ]

Инструкции циклов

ПОВТОРЯТЬ

 ; REPEAT number [ commands ]

REPEAT 10 [ FORWARD 10 LEFT 45 CIRCLE 10 ] ; repeat 10 times
 ; number is optional

REPEAT [ POSITION ANY ] ; endless loop

ПОВТОРИТЬ

Loop variable (also in the FOR and WHILE loops).

 REPEAT 100 [ FORWARD REPCOUNT LEFT 90 ]

FOR IN

Loop for the list elements:

 FOR i IN [1, 5, 7, 9, 11] [
FORWARD i
LEFT 90
]

Loop for the characters of a character sequence:

 FOR i IN “text” [
LABEL i
FORWARD 10
]

WHITE

 WHILE TRUE [ POSITION ANY ] ; endless loop
WHILE REPCOUNT <= 10 [ FORWARD 50 LEFT 36 ] ; as REPEAT 10 [ ... ]

ПРЕРВАТЬ

Stop the loop.

 REPEAT [ ; endless loop
POSITION ANY
IF REPCOUNT = 100 [ BREAK ] ; equivalent of the REPEAT 100 [ ... ]
]

ПРОДОЛЖИТЬ

Jump into the next iteration of the loop.

 REPEAT 100 [
POSITION ANY
IF REPCOUNT % 2 = 0 [ CONTINUE ]
CIRCLE 10 ; draw circles on every 2nd positions
]

Условия

ЕСЛИ

 ; IF condition [ true block ]
; IF condition [ true block ] [ false block ]

IF a < 10 [ PRINT “Small” ]
IF a < 10 [ PRINT “Small” ] [ PRINT “Big” ]

И, ИЛИ, НЕ

Logical operators.

 IF a < 10 AND NOT a = 5 [ PRINT “0, 1, 2, 3, 4, 6, 7, 8 or 9” ]
IF a < 10 AND a != 5 [ PRINT “0, 1, 2, 3, 4, 6, 7, 8 or 9” ] ; as above

Subroutines

TO, END

New word (or procedure).

 TO triangle
REPEAT 2 [ FORWARD 100 RIGHT 120 ] FILL
END

REPEAT 10 [ triangle PENUP POSITION ANY PENDOWN ]

ВЫВОД

Return value of the function.

 TO randomletter
OUTPUT RANDOM “qwertzuiopasdfghjklyxcvbnm”
END

PRINT randomletter + randomletter + randomletter ; print 3-letter random character sequence

СТОП

Return from the procedure.

 TO example number
IF number < 0 [ STOP ]
PRINT SQRT number ; print square root
]

example 100
example -1 ; without output and error
example 25

Default variables

ЛЮБОЙ

Default random value of colors, etc.

 PENCOLOR ANY ; random pen color

ИСТИНА

Логическое значение.

 WHILE TRUE [ POSITION ANY ] ; endless loop
PRINT TRUE ; print true

ЛОЖЬ

Логическое значение.

 WHILE NOT FALSE [ POSITION ANY ] ; endless loop
PRINT FALSE ; print false

РАЗМЕР_СТРАНИЦЫ

 PRINT PAGESIZE ; print list of the page sizes in points, eg. [595.30, 841.89]

ПИ/PI/π

 PRINT PI ; print 3.14159265359

Input/Output

ПЕЧАТЬ

 PRINT “text” ; print “text” in a dialog box
PRINT 5 + 10 ; print 15

ВВОД

 PRINT INPUT “Input value?” ; ask and print a string by a query dialog box
PRINT FLOAT (INPUT “First number?”) + FLOAT (INPUT “Second number?”) ; simple calculator

ЖДАТЬ

 SLEEP 1000 ; wait for 1000 ms (1 sec)

ОБЩЕЕ

Set global variables used in procedures.

 GLOBAL about
about = “LibreLogo”

TO example
PRINT about
GLOBAL about ; when we want to add a new value
about = “new value for the global variable”
END

example
PRINT about

Функции

СЛУЧАЙНО

 PRINT RANDOM 100 ; random float number (0 <= x < 100)
PRINT RANDOM “text” ; random letter of the “text”
PRINT RANDOM [1, 2] ; random list element (1 or 2)

ЦЕЛОЕ

 PRINT INT 3.8 ; print 3 (integer part of 3.8)
PRINT INT RANDOM 100 ; random integer number (0 <= x < 100)
PRINT INT “7” ; convert the string parameter to integer

ДРОБНОЕ

 ; convert the string parameter to float number
PRINT 2 * FLOAT “5.5” ; print 11.0

СТРОКА

 ; convert the number parameter to string
PRINT “Result: ” + STR 5 ; print “Result: 5”
PRINT 10 * STR 5 ; print 5555555555

КОРЕНЬ

 PRINT SQRT 100 ; print 10, square root of 100

SIN

 PRINT SIN 90 * PI/180 ; print 1.0 (sinus of 90° in radians)

COS

 PRINT COS 0 * PI/180 ; print 1.0 (cosinus of 0° in radians)

LOG10

 PRINT LOG10 100 ; print 2.0 (common logarithm of 100)

ОКРУГЛ

 PRINT ROUND 3.8 ; print 4 (rounding 3.8)
PRINT ROUND RANDOM 100 ; random integer number (0 <= x <= 100)

ABS

 PRINT ABS -10 ; print 10, absolute value of -10

СЧЁТ

 PRINT COUNT “text” ; print 4, character count of “text”
PRINT COUNT [1, 2, 3] ; print 3, size of the list

УСТАНОВИТЬ

 ; Convert list to Python set
PRINT SET [4, 5, 6, 6] ; print {4, 5, 6}
PRINT SET [4, 5, 6, 6] | SET [4, 1, 9] ; print {1, 4, 5, 6, 9}, union
PRINT SET [4, 5, 6, 6] & SET [4, 1, 9] ; print {4}, intersection
PRINT SET ([4, 5, 6, 6]) - SET [4, 1, 9] ; print {5, 6}, difference
PRINT SET [4, 5, 6, 6] ^ SET [4, 1, 9] ; print {1, 5, 6, 9}, symmetric difference

ДИАПАЗОН

 ; Python-like list generation
PRINT LIST RANGE 10 ; print [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
PRINT LIST RANGE 3 10 ; print [3, 4, 5, 6, 7, 8, 9]
PRINT LIST RANGE 3 10 3 ; print [3, 6, 9]

FOR i IN RANGE 10 50 10 [ ; loop for [10, 20, 30, 40]
FORWARD i
LEFT 90
]

СПИСОК

 ; remove the repeating elements of a list using set and list conversion
PRINT LIST (SET [1, 3, 5, 5, 2, 1]) ; print [1, 3, 5, 2]

КОРТЕЖ

Conversion to Python tuple (non-modifiable list)

 PRINT TUPLE [4, 5]

ОТСОРТИРОВАНО

It returns with a sorted list.

 PRINT SORTED [5, 1, 3, 4] ; print [1, 3, 4, 5]

SUB

Substitute character sequences using regex (regular expression) patterns.

 PRINT SUB (“t”, “T”, “text”) ; print “Text”, replacing “t” with “T”
PRINT SUB (“(.)”, “\\1\\1”, “text”) ; print “tteexxtt”, doubling every characters

ПОИСК

Search character sequences patterns using regex patterns.

 IF SEARCH (“\w”, "word") [ PRINT “Letter in the word.” ]

НАЙТИ_ВСЁ

Find all character sequences in the input string matching the given regex pattern.

 PRINT FINDALL(“\w+”, “Dogs, cats.”) ; print [“Dogs”, “cats”], the list of the words.

МИН

 PRINT MIN [1, 2, 3] ; print 1, the lowest element of the list

МАКС

 PRINT MAX [1, 2, 3] ; print 3, the greatest element of the list

Color constants

 PENCOLOR “SILVER” ; set by name
PENCOLOR [1] ; set by identifiers
PENCOLOR “~SILVER” ; random silver color

Идентификатор

Имя

0

BLACK

1

SILVER

2

GRAY/GREY

3

WHITE

4

MAROON

5

RED

6

PURPLE

7

FUCHSIA/MAGENTA

8

GREEN

9

LIME

10

OLIVE

11

YELLOW

12

NAVY

13

BLUE

14

TEAL

15

AQUA

16

PINK

17

TOMATO

18

ORANGE

19

GOLD

20

VIOLET

21

SKYBLUE

22

CHOCOLATE

23

BROWN

24

INVISIBLE


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