Package edu.macalester.graphics

Class Arc

java.lang.Object

edu.macalester.graphics.GraphicsObject

edu.macalester.graphics.Arc

All Implemented Interfaces:

Strokable

public class Arc
extends GraphicsObject
implements Strokable

A partial section of an ellipse.

Constructor Summary

Constructors

Constructor	Description
Arc(double x, double y, double width, double height, double startAngle, double sweepAngle)	This is an arc, based on Java's Arc2D.Double, which Java describes as follows: The arc is a partial section of a full ellipse which inscribes the framing rectangle of its parent RectangularShape.

Method Summary

Modifier and Type	Method	Description
protected void	drawInLocalCoordinates(Graphics2D gc)	For internal use.
Rectangle2D	getBounds()	Returns the bounding box of this graphics object in its local coordinates.
protected Object	getEqualityAttributes()	For internal use only.
Paint	getStrokeColor()	Returns the color to strokeColor that will be used to stroke this shape if it is stroked.
double	getStrokeWidth()	Returns the thickness of the stroke in pixels.
boolean	isStroked()	Returns true if the interior of this shape will be stroked with the stroke color.
void	setStrokeColor(Paint strokeColor)	Sets the stroke color to the given color.
void	setStroked(boolean stroked)	Causes the shape to be stroked with the stroke color when it is drawn.
void	setStrokeWidth(double width)	Sets how thick the stroke is.
boolean	testHitInLocalCoordinates(double x, double y)	Tests whether the given point is inside the boundary or interior of this object’s shape.

Methods inherited from class edu.macalester.graphics.GraphicsObject

addObserver, changed, equals, getAnchor, getBoundsInParent, getCanvas, getCenter, getElementAt, getElementAtLocalCoordinates, getEmbeddedComponent, getHeight, getPosition, getRotation, getScale, getScaleX, getScaleY, getSize, getSizeInParent, getWidth, getX, getY, hashCode, isInBounds, moveBy, moveBy, removeObserver, renderToBuffer, rotateBy, setAnchor, setAnchor, setCenter, setCenter, setPosition, setPosition, setRotation, setScale, setScale, setScale, setX, setY, testHit

Methods inherited from class java.lang.Object

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

Constructor Details

Arc

public Arc(double x,
 double y,
 double width,
 double height,
 double startAngle,
 double sweepAngle)

This is an arc, based on Java's Arc2D.Double, which Java describes as follows:

The arc is a partial section of a full ellipse which inscribes the framing rectangle of its parent RectangularShape. The angles are specified relative to the non-square framing rectangle such that 45 degrees always falls on the line from the center of the ellipse to the upper right corner of the framing rectangle. As a result, if the framing rectangle is noticeably longer along one axis than the other, the angles to the start and end of the arc segment will be skewed farther along the longer axis of the frame. Note that 0 degrees is the positive x axis along the center of the ellipse, making the 90 degree point on a line from the center of the ellipse to the top center point of the upper arc of the ellipse.

Parameters:

sweepAngle - angle to sweep around from the starting angle, e.g. 180 would create a 1/2 ellipse

Method Details

drawInLocalCoordinates

protected void drawInLocalCoordinates(Graphics2D gc)

Description copied from class: GraphicsObject

For internal use. Draws this graphics object on the screen in its local coordinates, without rotation or scaling.

Specified by:

drawInLocalCoordinates in class GraphicsObject

getStrokeColor

public Paint getStrokeColor()

Description copied from interface: Strokable

Returns the color to strokeColor that will be used to stroke this shape if it is stroked. Note that there will still be no stroke if isStroked() is false or the stroke width is zero.

Specified by:

getStrokeColor in interface Strokable

setStrokeColor

public void setStrokeColor(Paint strokeColor)

Description copied from interface: Strokable

Sets the stroke color to the given color. Automatically calls setStroked(true).

Specified by:

setStrokeColor in interface Strokable

getStrokeWidth

public double getStrokeWidth()

Description copied from interface: Strokable

Returns the thickness of the stroke in pixels.

Specified by:

getStrokeWidth in interface Strokable

setStrokeWidth

public void setStrokeWidth(double width)

Description copied from interface: Strokable

Sets how thick the stroke is. Automatically calls setStroked(true).

Specified by:

setStrokeWidth in interface Strokable

isStroked

public boolean isStroked()

Description copied from interface: Strokable

Returns true if the interior of this shape will be stroked with the stroke color.

Specified by:

isStroked in interface Strokable

setStroked

public void setStroked(boolean stroked)

Description copied from interface: Strokable

Causes the shape to be stroked with the stroke color when it is drawn.

Specified by:

setStroked in interface Strokable

testHitInLocalCoordinates

public boolean testHitInLocalCoordinates(double x,
 double y)

Description copied from class: GraphicsObject

Tests whether the given point is inside the boundary or interior of this object’s shape. The point is in this object’s local coordinates.

Specified by:

testHitInLocalCoordinates in class GraphicsObject

getBounds

public Rectangle2D getBounds()

Description copied from class: GraphicsObject

Returns the bounding box of this graphics object in its local coordinates.

Specified by:

getBounds in class GraphicsObject

getEqualityAttributes

protected Object getEqualityAttributes()

Description copied from class: GraphicsObject

For internal use only. Used to compute equals() and hashCode(). Returns an object whose equals() and hashCode() methods encompass the subclass-specific values that should be used to compute equality for the whole GraphicsObject.

Specified by:

getEqualityAttributes in class GraphicsObject