com.kitfox.svg.pathcmd

Class Arc

java.lang.Object

com.kitfox.svg.pathcmd.PathCommand

com.kitfox.svg.pathcmd.Arc

public class Arc
extends PathCommand

This is a little used SVG function, as most editors will save curves as Beziers. To reduce the need to rely on the Batik library, this functionallity is being bypassed for the time being. In the future, it would be nice to extend the GeneralPath command to include the arcTo ability provided by Batik.

Author:

Mark McKay, Mark McKay

Field Summary

Fields

Modifier and Type	Field and Description
boolean	largeArc
float	rx
float	ry
boolean	sweep
float	x
float	xAxisRot
float	y

Fields inherited from class com.kitfox.svg.pathcmd.PathCommand

isRelative

Constructor Summary

Constructors

Constructor and Description
Arc() Creates a new instance of MoveTo
Arc(boolean isRelative, float rx, float ry, float xAxisRot, boolean largeArc, boolean sweep, float x, float y)

Method Summary

Modifier and Type	Method and Description
void	appendPath(GeneralPath path, BuildHistory hist)
void	arcTo(GeneralPath path, float rx, float ry, float angle, boolean largeArcFlag, boolean sweepFlag, float x, float y, float x0, float y0) Adds an elliptical arc, defined by two radii, an angle from the x-axis, a flag to choose the large arc or not, a flag to indicate if we increase or decrease the angles and the final point of the arc.
static Arc2D	computeArc(double x0, double y0, double rx, double ry, double angle, boolean largeArcFlag, boolean sweepFlag, double x, double y) This constructs an unrotated Arc2D from the SVG specification of an Elliptical arc.
int	getNumKnotsAdded()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

rx

public float rx

ry

public float ry

xAxisRot

public float xAxisRot

largeArc

public boolean largeArc

sweep

public boolean sweep

x

public float x

y

public float y

Constructor Detail

Arc

public Arc()

Creates a new instance of MoveTo

Arc

public Arc(boolean isRelative,
           float rx,
           float ry,
           float xAxisRot,
           boolean largeArc,
           boolean sweep,
           float x,
           float y)

Method Detail

appendPath

public void appendPath(GeneralPath path,
                       BuildHistory hist)

Specified by:

appendPath in class PathCommand

getNumKnotsAdded

public int getNumKnotsAdded()

Specified by:

getNumKnotsAdded in class PathCommand

arcTo

public void arcTo(GeneralPath path,
                  float rx,
                  float ry,
                  float angle,
                  boolean largeArcFlag,
                  boolean sweepFlag,
                  float x,
                  float y,
                  float x0,
                  float y0)

Adds an elliptical arc, defined by two radii, an angle from the x-axis, a flag to choose the large arc or not, a flag to indicate if we increase or decrease the angles and the final point of the arc.

Parameters:

path - The path that the arc will be appended to.

rx - the x radius of the ellipse

ry - the y radius of the ellipse

angle - the angle from the x-axis of the current coordinate system to the x-axis of the ellipse in degrees.

largeArcFlag - the large arc flag. If true the arc spanning less than or equal to 180 degrees is chosen, otherwise the arc spanning greater than 180 degrees is chosen

sweepFlag - the sweep flag. If true the line joining center to arc sweeps through decreasing angles otherwise it sweeps through increasing angles

x - the absolute x coordinate of the final point of the arc.

y - the absolute y coordinate of the final point of the arc.

x0 - - The absolute x coordinate of the initial point of the arc.

y0 - - The absolute y coordinate of the initial point of the arc.

computeArc

public static Arc2D computeArc(double x0,
                               double y0,
                               double rx,
                               double ry,
                               double angle,
                               boolean largeArcFlag,
                               boolean sweepFlag,
                               double x,
                               double y)

This constructs an unrotated Arc2D from the SVG specification of an Elliptical arc. To get the final arc you need to apply a rotation transform such as: AffineTransform.getRotateInstance (angle, arc.getX()+arc.getWidth()/2, arc.getY()+arc.getHeight()/2);

Parameters:

x0 - origin of arc in x

y0 - origin of arc in y

rx - radius of arc in x

ry - radius of arc in y

angle - number of radians in arc

largeArcFlag -

sweepFlag -

x - ending coordinate of arc in x

y - ending coordinate of arc in y

Returns:

arc shape

toString

public String toString()

Overrides:

toString in class Object