Enterprise-grade turtle graphics library for abap intended for business-oriented children or bored adults.
The graphics are generated in the svg format.
Import the repository to your system using abapGit.
REPORT zabapturtle.
DATA(turtle) = NEW zcl_turtle( height = 800 width = 800 ).
turtle->set_pen( VALUE #( stroke_width = 2 ) ).
turtle->goto( x = 200 y = 200 ).
DATA(i) = 0.
DATA(n) = 15.
WHILE i < n.
turtle->polygon( num_sides = 10 side_length = 50 ).
turtle->right( 360 / n ).
i += 1.
ENDWHILE.
turtle->show( ).You can also save the image using turtle->download().
see zcl_turtle_examples for more
zcl_turtle
movement:
- forward, back
- left,right (rotate by x degrees)
- pen up/down (only considered when moving, not when outputting svg directly)
styling:
- background color
- stroke width
- stroke color
- fill color
zcl_turtle_svg
Generate svg primitives:
- line
- circle
- polyline
- polygon
- text
Note that this only returns the svg string. Add these shapes to a turtle using turtle->append_svg.
Color schemes:
A random color is used for each line. You can use turtle->set_color_scheme( ) to change the colors.
Define an initial state, a number of iterations and a set of replacement rules. These will be applied in each iteration. Finally, the symbols are translated into instructions and executed.
- movement
- rotation
- stack push/pop
See zcl_turtle_lsystem=>instruction_kind.
DATA(turtle) = zcl_turtle=>new( height = 800 width = 600 ).
turtle->goto( x = 200 y = 200 ).
DATA(parameters) = VALUE zcl_turtle_lsystem=>params(
initial_state = `F`
instructions = VALUE #(
( symbol = 'F' kind = zcl_turtle_lsystem=>instruction_kind-forward amount = 10 )
( symbol = '+' kind = zcl_turtle_lsystem=>instruction_kind-right amount = 90 )
( symbol = '-' kind = zcl_turtle_lsystem=>instruction_kind-left amount = 90 ) )
num_iterations = 3
rewrite_rules = VALUE #(
( from = `F` to = `F+F-F-F+F` )
)
).
DATA(lsystem) = zcl_turtle_lsystem=>new(
turtle = turtle
parameters = parameters ).
lsystem->execute( ).
lsystem->show( ).
The stack can be used to generate plants or trees:
DATA(turtle) = zcl_turtle=>new( height = 800 width = 600 ).
turtle->goto( x = 300 y = 600 ).
turtle->set_angle( -90 ).
DATA(parameters) = VALUE zcl_turtle_lsystem=>params(
initial_state = `F`
instructions = VALUE #(
( symbol = `F` kind = zcl_turtle_lsystem=>instruction_kind-forward amount = 10 )
( symbol = `+` kind = zcl_turtle_lsystem=>instruction_kind-right amount = 25 )
( symbol = `-` kind = zcl_turtle_lsystem=>instruction_kind-left amount = 25 )
( symbol = `[` kind = zcl_turtle_lsystem=>instruction_kind-stack_push )
( symbol = `]` kind = zcl_turtle_lsystem=>instruction_kind-stack_pop )
)
num_iterations = 5
rewrite_rules = VALUE #(
( from = `F` to = `F[+F]F[-F][F]` )
)
).
DATA(lsystem) = zcl_turtle_lsystem=>new(
turtle = turtle
parameters = parameters ).
lsystem->execute( ).
lsystem->show( ).
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