ShapesTest
getting an error that i don't understand. it's on the line that adds panel
to the JFrame application
.
import javax.swing.JFrame;
import javax.swing.JOptionPane;
publicclass ShapesTest
{
publicstaticvoid main(String[] args)
{
//obtain user choice
String input = JOptionPane.showInputDialog("Enter 1 to draw rectagles\n" +
"Enter 2 to draw ovals");
int choice = Integer.parseInt(input);//convert input to int
//create the panel w/ input
Shapes panel =new Shapes(choice);
JFrame application =new JFrame();//creates a new JFrame
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
application.add(panel);//add the panel to the frame
application.setSize(300,300);
application.setVisible(true);
}//end main
}//end class ShapesTest
error says something like: method add() is not applicable for the arguments (Shapes)
anyone?
[1716 byte] By [
drapakia] at [2007-11-26 14:26:34]
Yea, you cant add Shapes to a Container.
Shapes are just drawable shapes. Theyre not actual components
or containers.
You need to create a JPanel (which is a container + a component) and
add that to the JFrame - preferably set it as the content pane.
JPanel panel = new JPanel(){
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D gfx = (Graphics2D)g;
gfx.setPaint(Color.RED);
gfx.fill(shape)
gfx.setPaint(Color.BLACK);
gfx.setStroke(new BasicStroke(3));
gfx.draw(shape);
}
}
frame.setContentPane(panel)
or
frame.getContentPane().add(panel)
in the future ask these questions in the Swing section.
duke?
Here is something for you to play with.
Im not sure what your Shapes class is though?
Are you trying to use Shape or is this Class from a school class or something?
You need to import java.awt.geom.* for the Shape Class.
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class ShapeTest{
public static void main(String[] args){
new ShapeTest();
}
public ShapeTest(){
panel = new DrawPanel();
frame = new JFrame("Shapes");
frame.setSize(400, 400);
frame.setContentPane(panel);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public class DrawPanel extends JPanel{
public DrawPanel(){
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D gfx = (Graphics2D)g;
Shape shape = new Ellipse2D.Double(20, 20, 20, 20);
gfx.setPaint(Color.RED);
gfx.fill(shape);
gfx.setPaint(Color.BLACK);
gfx.setStroke(new BasicStroke(3));
gfx.draw(shape);
}
}
JFrame frame;
JPanel panel;
}
believe it or not, i was copying this code out of the book to see if i could get it to work.. and got an error! here is the class code: cause i think i'm still confused...
import java.awt.Graphics;
import javax.swing.JPanel;
public class Shapes
{
private int choice;//user's choice of which shape
//consturctor
public Shapes(int userChoice)
{
choice = userChoice;
}//end constructor
//draws cascade of shpaes
public void paintComponent(Graphics g)
{
super.paintComponent( g );
for(int i=0; 1<10; i++)
{
//pick the shape
switch (choice)
{
case 1: //rectangles
g.drawRect(10+i*10, 10+i*10, 50+i*10, 50+i*10 );
break;
case 2: //ovals
g.drawOval(10+i*10, 10+i*10, 50+i*10, 50+i*10);
break;
}//end switch
}//end for
}//end method
}//end class
