com.partnersoft.geometry.xy

Class XyTurtle

java.lang.Object

com.partnersoft.geometry.xy.XyTurtle

public class XyTurtle
extends java.lang.Object

A turtle-graphics geometry builder for (x, y) space.

Turtle graphics were popular when I was in middle school as a teaching tool. It was a part of the LOGO teaching language. It uses a relative, vector style of graphics programming based on moving a virtual "turtle" around and giving it drawing commands. This style feels natural when building a sequence of geometries (e.g. while reading them from some streaming format).

Copyright 2007 Partner Software, Inc.

Author:

Paul Reavis

Constructor Summary

Constructors

Constructor and Description
XyTurtle()

Method Summary

Methods

Modifier and Type	Method and Description
void	forward(double distance)
XyDirection	getDirection() Gets the turtle's current direction.
double	getMinimumSegmentLength() Get the current minimum segment length setting.
XyPoint	getPoint() Gets the turtle's current location.
java.util.List<XyPolyline>	getResults()
boolean	isPenDown()
void	left(XyAngle angle)
void	moveTo(XyPoint point) Moves the virtual pen.
void	penDown() Puts the pen down, starting drawing.
void	penUp() Pulls the pen up, stopping drawing.
void	right(XyAngle angle)
void	rotate(XyRotation rotation)
void	setDirection(XyDirection newDirection)
void	setMinimumSegmentLength(double newLength) Sets the current minimum segment length.
void	setPenDown(boolean tizit)
void	setPoint(XyPoint newPoint)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XyTurtle

public XyTurtle()

Method Detail

moveTo

public void moveTo(XyPoint point)

Moves the virtual pen. If the pen is down, draws a line.

penUp

public void penUp()

Pulls the pen up, stopping drawing.

penDown

public void penDown()

Puts the pen down, starting drawing.

rotate

public void rotate(XyRotation rotation)

left

public void left(XyAngle angle)

right

public void right(XyAngle angle)

forward

public void forward(double distance)

getResults

public java.util.List<XyPolyline> getResults()

getMinimumSegmentLength

public double getMinimumSegmentLength()

Get the current minimum segment length setting. Zero means there is no minimum length.

setMinimumSegmentLength

public void setMinimumSegmentLength(double newLength)

Sets the current minimum segment length. Zero means there is no minimum length.

getPoint

public XyPoint getPoint()

Gets the turtle's current location.

setPoint

public void setPoint(XyPoint newPoint)

getDirection

public XyDirection getDirection()

Gets the turtle's current direction.

setDirection

public void setDirection(XyDirection newDirection)

isPenDown

public boolean isPenDown()

setPenDown

public void setPenDown(boolean tizit)