java.awt.geom outdated/update?

Question

I am using the sun java tutorials, which make use of the java.awt.geom file. (Im using the NetBeans compiler). When I am typing, it shows up the errors as I go. When I type g2.draw(new Rectangle2D(100, 100, 200, 300))
it says that it cant find it in the java.awt.geom package. It is there as Line2D works, but I think it is outdated.
How do I get the new version of it, and how do I then use it in my program?

PS. Simple answers please. Ich bin ein noob.

Answer 1

You have to cast the Graphics g to Graphics2D, then you can use Rectangle2D as a Shape. FYI Rectangle2D has two static constructors. Rectangle2D.Float and Rectangle2D.Double.



Shape is an interface, you would g2.fill( r ) or g2.stroke( r ); after you g2.setPaint( Color.red ); g2.setStroke( 2f ); Graphics2D is a whole new way of making graphics, more than I can explain here. In fact, the Graphics2D is a separate tutorial from the Java tuts.



IIWY, stick with the simple .awt Rectagle( x, y, w, h ); using int and Graphics. Graphics2D is fabulous (Adobe wrote the code), but also Graphics2D is a whole different way of composing graphics at type double precision.



You already have Graphics2D.



The easiest way to see Graphics2D... make a JFrame and add this



import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import java.awt.Shape;

import java.awt.geom.Rectangle2D;

import javax.swing.BorderFactory;

import javax.swing.JPanel;

import javax.swing.border.BevelBorder;



public class PrettyPanel

extends JPanel {



public PrettyPanel() {



setBorder( BorderFactory

.createBevelBorder(

BevelBorder.RAISED));

setBackground( Color.magenta );

setOpaque( true );

}

protected void paintComponent( Graphics g ) {

super.paintComponent(g);

Graphics2D g2 = (Graphics2D)g;

Rectangle r1 = getBounds();

Rectangle2D r2 = r1.getBounds2D();

double xLoc = r2.getWidth() / 2;

double yLoc = r2.getHeight() / 2;

double wide = 166;

double tall = 103;

xLoc -= wide / 2;

yLoc -= tall / 2;

r2.setRect(xLoc,yLoc,wide,tall);



g2.setPaint(Color.red);

g2.fill(r2);

g2.setStroke( new BasicStroke(3f));

g2.setColor( Color.cyan );

g2.draw(r2);

}

}

Answer 2

From the API:



This is an abstract class that cannot be instantiated directly.



http://java.sun.com/javase/7/docs/api/java/awt/geom/Rectangle2D.html#Rectangle2D()



(In object-oriented programming, abstract classes are "base" classes which provide structure and methods/variables to be inherited and built upon by "subclasses". An example might be a "shape" class - you can't really instantiate a shape, but you can instantiate a subclass of it, perhaps RectangularPrism.).



Instead, use Rectangle:



g2.draw(new Rectangle(100, 100, 200, 300));



http://java.sun.com/javase/7/docs/api/java/awt/Rectangle.html#Rectangle(int,%20int,%20int,%20int)



The API can be very helpful in figuring out your errors:

http://java.sun.com/javase/7/docs/api/

Answer 3

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