Package edu.cnu.mdi.item

Class LineItem

java.lang.Object

edu.cnu.mdi.item.AItem

edu.cnu.mdi.item.LineItem

All Implemented Interfaces:

IFeedbackProvider, IDrawable, EventListener

public class LineItem
extends AItem

A simple AItem representing a world-coordinate line segment.

The line geometry is stored in AItem._line (world coordinates). Rendering and hit-testing are performed in screen space via the supplied IContainer transforms.

This item supports ItemModificationType DRAG and ItemModificationType RESIZE modifications. Rotation is currently a no-op (consistent with the prior implementation).

Field Summary

Fields inherited from class edu.cnu.mdi.item.AItem

_connectable, _deletable, _dirty, _displayName, _doubleClickable, _draggable, _enabled, _focus, _FOCUSFILL, _lastDrawnPolygon, _layer, _line, _locked, _modification, _path, _popupMenu, _resizable, _resizePolicy, _rightClickable, _rotatable, _selectable, _selected, _style, _styleEditable, _visible, rotateIcon, RPSIZE, RPSIZE2, SPSIZE, SPSIZE2

Constructor Summary

Constructors

Constructor	Description
LineItem(Layer layer, Point2D.Double wp0, Point2D.Double wp1)	Create a world line object.
LineItem(Layer layer, Point2D.Double wp0, Point2D.Double wp1, Object... keyVals)	Create a world line object.

Method Summary

Modifier and Type	Method	Description
boolean	contains(IContainer container, Point screenPoint)	Check whether the (rendered) item contains the given screen point.
void	drawItem(Graphics2D g2, IContainer container)	Custom drawer for the item.
Point[]	getSelectionPoints(IContainer container)	Obtain the selection points used to indicate this item is selected.
Rectangle2D.Double	getWorldBounds()	Get the world bounding rectangle of the item.
void	modify()	A modification such as a drag, resize or rotate is continuing.
boolean	shouldDraw(Graphics2D g2, IContainer container)	Checks whether the item should be drawn.
void	translateWorld(double dx, double dy)	Translate this item by (dx, dy) in world coordinates.
protected void	updateFocus()	Hook called when geometry changes and the focus should be recomputed.

Methods inherited from class edu.cnu.mdi.item.AItem

acceptModification, applyGeometryProperties, applyProperties, applyStyleProperties, createPopupMenu, doubleClicked, draw, drawSelections, enclosed, equals, focusFill, geometryChanged, getAzimuth, getBounds, getContainer, getDisplayName, getFeedbackStrings, getFocus, getFocusPoint, getItemModification, getLastDrawnPolygon, getLayer, getLine, getPath, getPopupMenu, getResizePolicy, getRotatePoint, getStyle, getStyleSafe, getView, hashCode, inASelectRect, inRotatePoint, inSelectPoint, isConnectable, isDeletable, isDirty, isDoubleClickable, isDraggable, isEnabled, isLocked, isResizable, isRightClickable, isRotatable, isSelectable, isSelected, isStyleEditable, isTrackable, isVisible, modificationRejected, prepareForPopup, prepareForRemoval, setAzimuth, setConnectable, setDeletable, setDirty, setDisplayName, setDoubleClickable, setDraggable, setEnabled, setFillFocus, setFocus, setLocked, setModification, setResizable, setResizePolicy, setRightClickable, setRotatable, setSelectable, setSelected, setStyle, setStyleEditable, setVisible, startModification, stopModification, translateLocal

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.cnu.mdi.graphics.drawable.IDrawable

getName

Constructor Details

LineItem

public LineItem(Layer layer,
 Point2D.Double wp0,
 Point2D.Double wp1)

Create a world line object.

Parameters:

layer - the layer this item is on.

wp0 - start of the line.

wp1 - end of the line of the line.

LineItem

public LineItem(Layer layer,
 Point2D.Double wp0,
 Point2D.Double wp1,
 Object... keyVals)

Create a world line object.

Parameters:

layer - the layer this item is on.

wp0 - start of the line.

wp1 - end of the line of the line.

keyVals - optional key-value pairs to set on the item. For example, you could use this to set the display name, style, or other properties at construction time. The keys should be from the set of standard keys defined in PropertyUtils, or any custom keys recognized by this item or its style.

Method Details

contains

public boolean contains(IContainer container,
 Point screenPoint)

Check whether the (rendered) item contains the given screen point.

Overrides:

contains in class AItem

Parameters:

container - the graphical container rendering the item.

screenPoint - a pixel location.

Returns:

true if the item, as rendered on the given container, contains the given screen point.

drawItem

public void drawItem(Graphics2D g2,
 IContainer container)

Custom drawer for the item.

Specified by:

drawItem in class AItem

Parameters:

g2 - the graphics context.

container - the graphical container being rendered.

shouldDraw

public boolean shouldDraw(Graphics2D g2,
 IContainer container)

Checks whether the item should be drawn. This is an additional check, beyond the simple visibility flag check. For example, it might check whether the item intersects the area being drawn.

Specified by:

shouldDraw in class AItem

Parameters:

g2 - the graphics context.

container - the graphical container being rendered.

Returns:

true if the item passes any and all tests, and should be drawn.

getSelectionPoints

public Point[] getSelectionPoints(IContainer container)

Obtain the selection points used to indicate this item is selected.

Overrides:

getSelectionPoints in class AItem

Parameters:

container - the container rendering this item

Returns:

the selection points used to indicate this item is selected.

modify

public void modify()

A modification such as a drag, resize or rotate is continuing.

Specified by:

modify in class AItem

updateFocus

protected void updateFocus()

Description copied from class: AItem

Hook called when geometry changes and the focus should be recomputed. The default implementation is a no-op.

Overrides:

updateFocus in class AItem

getWorldBounds

public Rectangle2D.Double getWorldBounds()

Get the world bounding rectangle of the item.

Specified by:

getWorldBounds in class AItem

Returns:

the world box containing the item.

translateWorld

public void translateWorld(double dx,
 double dy)

Description copied from class: AItem

Translate this item by (dx, dy) in world coordinates.

Specified by:

translateWorld in class AItem

Parameters:

dx - the world-coordinate offset along the X axis

dy - the world-coordinate offset along the Y axis