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com.vistech.shapes
Class Box

java.lang.Object
  |
  +--com.vistech.shapes.Shapes
        |
        +--com.vistech.shapes.Box
All Implemented Interfaces:
java.lang.Cloneable, Drawable, Fillable, java.io.Serializable
public class Box
extends Shapes
implements Fillable

Represents an interactively drawable rectangle. Although the Box shape is a rectangle, it is drawn as a polygon in this implementation. The drawing of a rectangle requires the upper left hand corner coordinates as the starting position. So the drawRect will draw the rectangle from top to bottom and left to right. If the current position moves up or right with respect to the starting position, the rectangle will not be drawn because the width and height values are negative. So there are two options. 1. Switch the starting and current positions whenever the rectangle is drawn from bottom to top or right to left. 2. Use the drawPolygon method. We chose the second option because it involved less programming.

Version:
1.0 30 July 1999
Author:
Larry Rodrigues
See Also:
Serialized Form

Field Summary
protected  int[] xp
          xp the x coordinates of the Box corners
protected  int[] yp
          yp the y coordinates of the Box corners
 
Fields inherited from class com.vistech.shapes.Shapes
basicStroke, cur, drawingColor, fillColor, fillOn, font, path, shapeCount, smallRectsOn, st
 
Fields inherited from interface com.vistech.shapes.Drawable
ANNOTEXT, ARROW, BOX, CUBIC_CURVE, CURVE, DOUBLE_HEADED_ARROW, ELLIPSE, LINE, NONE, POLYGON
 
Constructor Summary
Box()
           
 
Method Summary
 boolean contains(java.awt.Graphics2D g, int x, int y)
          Vhecks whether the specified point contained in the shape.
 void draw(java.awt.Graphics2D g)
          Draws the shape permanently, which happens when the mouse is released.
 void drawInteractive(java.awt.Graphics2D g)
          Draws interactively on a Graphics context g.
 void drawPolygon(java.awt.Graphics2D g, int[] x, int[] y)
          Draws the box with the specified vertices.
 void drawSmallRects(java.awt.Graphics2D g)
          Draws small rectangle at the shape corners to indicate that the shape is active.
 void erase(java.awt.Graphics2D g)
          Erases the box
 void fill(java.awt.Graphics2D g, java.awt.Color color)
          Fills with a given color.
 void fillPolygon(java.awt.Graphics2D g, int[] x, int[] y)
          Fills the box.
 void init(int x, int y)
          Initializes the Box parameters.
 void move(java.awt.Graphics2D g, int diffx, int diffy)
          Moves the shape by a specified displacement.
 void setCurrentPosition(java.awt.Point cp)
          Sets the current position.
 
Methods inherited from class com.vistech.shapes.Shapes
contains, copy, getCurrentPosition, getDrawingColor, getFillColor, getFillOn, getFont, getGeneralPath, getShapeCount, getSmallRectsOn, getStartPosition, getStroke, setDrawingColor, setFillColor, setFillOn, setFont, setGeneralPath, setShapeCount, setSmallRectsOn, setStartPosition, setStroke
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

xp

protected int[] xp
xp the x coordinates of the Box corners

yp

protected int[] yp
yp the y coordinates of the Box corners
Constructor Detail

Box

public Box()
Method Detail

init

public void init(int x,
                 int y)
Initializes the Box parameters. The arguments provide the starting point of the box which may be the upper left hand corner(ULHC) or bottom righthand corner coordinates(BRHC) of the Box.
Specified by:
init in interface Drawable
Overrides:
init in class Shapes
Parameters:
x - the x coordinate of the starting position.
y - the y coordinate of the starting poistion.

setCurrentPosition

public void setCurrentPosition(java.awt.Point cp)
Sets the current position.
Specified by:
setCurrentPosition in interface Drawable
Overrides:
setCurrentPosition in class Shapes
Parameters:
x - the x coordinate of the current position.
y - the y coordinate of the current poistion.

drawInteractive

public void drawInteractive(java.awt.Graphics2D g)
Draws interactively on a Graphics context g. This API does not check whether the Box overflows the borders of the component. This method uses the XOR paint mode. It erases the previously drawn shape and draws a new shape in its place.
Specified by:
drawInteractive in interface Drawable
Parameters:
g - the graphics object on which the shape is to be drawn.

draw

public void draw(java.awt.Graphics2D g)
Description copied from interface: Drawable
Draws the shape permanently, which happens when the mouse is released.
Specified by:
draw in interface Drawable
Following copied from interface: com.vistech.shapes.Drawable
Parameters:
g - the graphcs context on which the shape is drawn.

move

public void move(java.awt.Graphics2D g,
                 int diffx,
                 int diffy)
Description copied from interface: Drawable
Moves the shape by a specified displacement.
Specified by:
move in interface Drawable
Following copied from interface: com.vistech.shapes.Drawable
Parameters:
x - the displacement.
y - the displacement.

erase

public void erase(java.awt.Graphics2D g)
Erases the box
Specified by:
erase in interface Drawable
Parameters:
g - the graphics object on which the shape is drawn.

fill

public void fill(java.awt.Graphics2D g,
                 java.awt.Color color)
Fills with a given color.
Specified by:
fill in interface Fillable
Parameters:
g - the graphics object on which the shape is to be drawn.
color - the filling color.

contains

public boolean contains(java.awt.Graphics2D g,
                        int x,
                        int y)
Description copied from class: Shapes
Vhecks whether the specified point contained in the shape.
Overrides:
contains in class Shapes
Following copied from class: com.vistech.shapes.Shapes
Parameters:
g - the graphics context on which the shape was drawn.
x - the coordinate of the point that is being checked for containment.
y - the coordinate of the point that is being checked for containment.

drawSmallRects

public void drawSmallRects(java.awt.Graphics2D g)
Description copied from class: Shapes
Draws small rectangle at the shape corners to indicate that the shape is active. For example, a shape that is being moved is surrounded by small rectagles at the shape corners. small rectab
Overrides:
drawSmallRects in class Shapes
Following copied from class: com.vistech.shapes.Shapes
Parameters:
g - the graphics context on which the shape was drawn.

drawPolygon

public void drawPolygon(java.awt.Graphics2D g,
                        int[] x,
                        int[] y)
Draws the box with the specified vertices.
Parameters:
g - the graphics object on which the shape is to be drawn.
x - an array of x coordinates.
y - an array of y coordinates.

fillPolygon

public void fillPolygon(java.awt.Graphics2D g,
                        int[] x,
                        int[] y)
Fills the box.
Parameters:
g - the graphics object on which the shape is to be drawn.
x - an array of x coordinates.
y - an array of y coordinates.
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