fdda.graphics.java2d
Class Component

java.lang.Object
  |
  +--fdda.graphics.java2d.Component

All Implemented Interfaces:

Cloneable, Component

Direct Known Subclasses:

Container, LineSegment, Message, Node, Point

public abstract class Component

extends Object

implements Component

Implementation of the component interface. Provides several standard implementations of abstract methods. Most notably implements a mechanism for the calculation of the shape: calcShape() is _only_ called by getShape(), and _only_ if the shape has changed. A change of the shape is signalled by the attribute dirtyShape.

Author:

Jörg Rüdenauer

Field Summary

protected static Color	COLOR_NORMAL normal drawing color
protected static Color	COLOR_SELECTED color for selected elements
protected boolean	dirtyShape must the shape be recalculated?
protected boolean	selected whether the component is selected
protected Shape	shape the shape of the component
protected double	x the x coordinate
protected double	y the y coordinate

Fields inherited from interface fdda.graphics.Component

SEL_ALL, SEL_EQUALS, SEL_MOVABLES, SEL_NOTHING

Constructor Summary

Component(double x, double y)
Default constructor.

Component(double x, double y, boolean selected)
Constructor.

Method Summary

protected abstract void	calcShape() Recalculates the shape.
Object	clone() Clones the component
void	deselect() Unsets the selected flag.
abstract void	draw(Graphics2D graphContext) Draws the component, using the given graphics.
GraphicalSystem	getGraphicalSystem() Returns the system which includes the component.
Shape	getShape() Returns the shape of the component.
double	getX() Returns the x coordinate of the component (or its most prominent point).
double	getY() Returns the y coordinate of the component (or its most prominent point).
boolean	isSelected() Returns whether the component is currently selected.
void	recalculateShape() Recalculates the shape of the component.
void	select() Sets the selected flag.
void	setGraphicalSystem(GraphicalSystem graphicalSystem) Sets the system which includes the component
void	setXY(double x, double y) Sets the coordinates of the component (or of its most prominent point).

Methods inherited from class java.lang.Object

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

Methods inherited from interface fdda.graphics.Component

isMovable, move, selectableWith, visit

Field Detail

x

protected double x

the x coordinate

y

protected double y

the y coordinate

shape

protected Shape shape

the shape of the component

selected

protected boolean selected

whether the component is selected

COLOR_NORMAL

protected static final Color COLOR_NORMAL

normal drawing color

COLOR_SELECTED

protected static final Color COLOR_SELECTED

color for selected elements

dirtyShape

protected boolean dirtyShape

must the shape be recalculated?

Constructor Detail

Component

public Component(double x,
                 double y)

Default constructor. Component is not selected.

Parameters:

x - the x coordinate

y - the y coordinate

Component

public Component(double x,
                 double y,
                 boolean selected)

Constructor.

Parameters:

x - the x coordinate

y - the y coordinate

selected - whether the component is selected

Method Detail

clone

public Object clone()

Description copied from interface: Component

Clones the component

Specified by:

clone in interface Component

Overrides:

clone in class Object

Returns:

the clone

select

public void select()

Sets the selected flag. Doesn't repaint the component. This method should be overriden by subclasses if the shape changes.

Specified by:

select in interface Component

See Also:

Component.select()

deselect

public void deselect()

Unsets the selected flag. Doesn't repaint the component. This method should be overriden by subclasses if the shape changes.

Specified by:

deselect in interface Component

See Also:

Component.deselect()

getX

public double getX()

Description copied from interface: Component

Returns the x coordinate of the component (or its most prominent point).

Specified by:

getX in interface Component

Returns:

the x coordinate

getY

public double getY()

Description copied from interface: Component

Returns the y coordinate of the component (or its most prominent point).

Specified by:

getY in interface Component

Returns:

the y coordinate

setXY

public void setXY(double x,
                  double y)

Description copied from interface: Component

Sets the coordinates of the component (or of its most prominent point).

Specified by:

setXY in interface Component

Parameters:

x - the x coordinate

y - the y coordinate

getShape

public Shape getShape()

Description copied from interface: Component

Returns the shape of the component. This may actually be bigger than the shape seen on screen. It is the shape that is redrawn by the graphic system.

Specified by:

getShape in interface Component

Returns:

the shape of the component

recalculateShape

public void recalculateShape()

Description copied from interface: Component

Recalculates the shape of the component. Needs not be called explicitly if the change of the shape is made by other member functions.

Specified by:

recalculateShape in interface Component

calcShape

protected abstract void calcShape()

Recalculates the shape. Is called by getShape if the flag dirtyShape is set. Must unset the flag after calculation.

isSelected

public boolean isSelected()

Description copied from interface: Component

Returns whether the component is currently selected.

Specified by:

isSelected in interface Component

Returns:

the selection state.

draw

public abstract void draw(Graphics2D graphContext)

Draws the component, using the given graphics. The graphics should have the same attributes (color, pen, etc.) after the call as before the call.

Parameters:

graphContext - the graphics

getGraphicalSystem

public GraphicalSystem getGraphicalSystem()

Description copied from interface: Component

Returns the system which includes the component.

Specified by:

getGraphicalSystem in interface Component

Returns:

the graphical system

setGraphicalSystem

public void setGraphicalSystem(GraphicalSystem graphicalSystem)

Description copied from interface: Component

Sets the system which includes the component

Specified by:

setGraphicalSystem in interface Component

Parameters:

graphicalSystem - the graphical system