Class DrawingObject

java.lang.Object

DrawingObject

Direct Known Subclasses:

DrawingEllipse, DrawingLine, DrawingSquare, DrawingX

public abstract class DrawingObject
extends java.lang.Object

This abstract class defines the four functions that all of the DrawingObject derived classes must have. The four abstract functions defined in this class must be implemented in the classes that extend this one.

Constructor Summary

Constructors

Constructor and Description
DrawingObject()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	clickHitEllipse(int px, int py, int x1, int y1, int x2, int y2) This utility function makes it easy to check whether the coordinates of the user's mouse click (px,py) are on (or very close to) the ellipse defined by the bounding box with corners at (x1,y1) and (x2,y2).
static boolean	clickHitLine(int px, int py, int x1, int y1, int x2, int y2) This utility function makes it easy to check whether the coordinates of the user's mouse click (px,py) are on (or very close to) the line between the two points, (x1,y1) and (x2,y2).
abstract void	drawObject(java.awt.Graphics2D g2) This function is called to request that the object draw itself using the provided Graphics2D context.
abstract java.awt.Rectangle	getBoundingBox() This function returns a Rectangle object that describes the 'bounding box'.
abstract void	resizeObject(int x1, int y1, int x2, int y2) This function changes the coordinates that define the location and size of the object.
abstract boolean	wasClicked(int px, int py) This function returns a boolean that indicates whether the provided coordinate (px,py) hits any part of the object.

Methods inherited from class java.lang.Object

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

Constructor Detail

DrawingObject

public DrawingObject()

Method Detail

resizeObject

public abstract void resizeObject(int x1,
                int y1,
                int x2,
                int y2)

This function changes the coordinates that define the location and size of the object.

wasClicked

public abstract boolean wasClicked(int px,
                 int py)

This function returns a boolean that indicates whether the provided coordinate (px,py) hits any part of the object.

getBoundingBox

public abstract java.awt.Rectangle getBoundingBox()

This function returns a Rectangle object that describes the 'bounding box'. The bounding box is the smallest rectange that contains the object.

drawObject

public abstract void drawObject(java.awt.Graphics2D g2)

This function is called to request that the object draw itself using the provided Graphics2D context.

clickHitLine

public static boolean clickHitLine(int px,
                   int py,
                   int x1,
                   int y1,
                   int x2,
                   int y2)

This utility function makes it easy to check whether the coordinates of the user's mouse click (px,py) are on (or very close to) the line between the two points, (x1,y1) and (x2,y2).

clickHitEllipse

public static boolean clickHitEllipse(int px,
                      int py,
                      int x1,
                      int y1,
                      int x2,
                      int y2)

This utility function makes it easy to check whether the coordinates of the user's mouse click (px,py) are on (or very close to) the ellipse defined by the bounding box with corners at (x1,y1) and (x2,y2).