Maintainer | Michael Sloan <mgsloan at gmail>, Deepak Jois <deepak.jois@gmail.com> |
---|---|
Safe Haskell | None |
Authors : Michael Sloan at gmail, Deepak Jois deepak.jois@gmail.com
A module consisting of core types and functions to represent and operate on a "turtle".
More info about turtle graphics: http://en.wikipedia.org/wiki/Turtle_graphics
- data Turtle = Turtle {}
- data TurtlePath = TurtlePath {}
- data PenStyle = PenStyle {}
- forward :: Double -> Turtle -> Turtle
- backward :: Double -> Turtle -> Turtle
- left :: Double -> Turtle -> Turtle
- right :: Double -> Turtle -> Turtle
- setPenColor :: Colour Double -> Turtle -> Turtle
- setPenColour :: Colour Double -> Turtle -> Turtle
- setPenWidth :: Double -> Turtle -> Turtle
- startTurtle :: Turtle
- setHeading :: Double -> Turtle -> Turtle
- towards :: P2 -> Turtle -> Turtle
- setPenPos :: P2 -> Turtle -> Turtle
- penUp :: Turtle -> Turtle
- penDown :: Turtle -> Turtle
- penHop :: Turtle -> Turtle
- closeCurrent :: Turtle -> Turtle
- traceTurtle :: Turtle -> Turtle
- getTurtleDiagram :: Renderable (Path R2) b => Turtle -> Diagram b R2
Turtle data types and accessors
Core turtle data type. A turtle needs to keep track of its current position, like its position, heading etc., and all the paths that it has traversed so far.
We need to record a new path, everytime an attribute like style, pen position etc changes, so that we can separately track styles for each portion of the eventual path that the turtle took.
Turtle | |
|
data TurtlePath Source
Turtle path type that captures a list of paths and the style attributes associated with them
Style attributes associated with the turtle pen
Motion commands
Move the turtle forward by x
units
Move the turtle backward by x
units
Turn the turtle anti-clockwise (left)
Turn the turtle clockwise (right)
Pen style commands
alias of setPenColour
Set a new pen color for turtle.
If pen is down, this adds the current trail to paths
and starts a new empty
trail.
Set a new pen width for turtle.
If pen is down, this adds the current trail to paths
and starts a new empty
trail.
State setters
The initial state of turtle. The turtle is located at the origin, at an
orientation of 0 degrees with its pen position down. The pen style is
defaultPenStyle
.
Turn the turtle to the given orientation, in degrees
Sets the turtle orientation towards a given location.
Set the turtle X/Y position.
If pen is down and the current trail is non-empty, this will also add the
current trail to the paths
field.
Drawing control
Puts the turtle pen in “Up” mode. Turtle movements will not draw anything
Does nothing if the pen was already up. Otherwise, it creates a turtle with
the current trail added to paths
.
Puts the turtle pen in “Down” mode. Turtle movements will cause drawing to happen
Does nothing if the pen was already down. Otherwise, starts a new trail starting at the current position.
closeCurrent :: Turtle -> TurtleSource
Debugging
traceTurtle :: Turtle -> TurtleSource
Prints out turtle representation and returns it. Use for debugging
Diagram related
getTurtleDiagram :: Renderable (Path R2) b => Turtle -> Diagram b R2Source
Creates a diagram from a turtle
Applies the styles to each trails in paths
separately and combines them
into a single diagram