Re: FlowLayout and lightweight IDEs

On Aug 9, 11:08 pm, bH <bherbs...@hotmail.com> wrote:


:


I can't


reating


e


layed


 may not


o


ml>


2?


e


s


Hi All,
This is the corrected program fixing the errors
that I questioned about above. It is no longer
quirky.
Andrew, I have tried to limit it to the correct text
width. With the fix and the notes in place, it is no longer
a small program. I also tried to take the suggestions
of others to make it happen.

bH
The program:
/* demo taken from :
 http://www.cs.stir.ac.uk/~sbj/examples/Java-applications
  /DrawImageDemo/
 With this program the user can adjust measures, colors
 when downloading a pentagon shape from Google.
 The Google Developers Guide site is:
 http://code.google.com/apis/chart/
 */
import java.text.*;
import java.awt.image.*;
import java.net.*;
import java.util.Date;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.imageio.*;
import java.io.*; // For IOException

public class DrawImageCentered extends JFrame
  implements ActionListener {

  // Start up the application
  public static void main(String args[]) {
    DrawImageCentered app = new DrawImageCentered();
    app.setSize(800,500); //explicitly sets the size
    // app.pack(); // app.pack() makes the window
    // exactly the right size for its laid out contents
    app.setVisible(true);
  } // main
  private BufferedImage image;

  private ClassLoader cl = getClass().getClassLoader();
   // So we can load image resources

  private JButton choice1 =
    new JButton("Google Draw Image"),
    choice2 = new JButton("Save Image"),
    choice3 = new JButton("Close");
  private JTextField addressField = new JTextField
    ("http://chart.apis.google.com/chart?"),
    appendFieldcht = new JTextField("r"),
    appendFieldchs = new JTextField("400x400"),
    appendFieldchd = new JTextField("t:70,70,70,70,70,70"),
    appendFieldchm = new JTextField("B,FF0000,0,0,5"),
    appendFieldchf = new JTextField("c,s,000000");
  private JLabel lblhttp = new JLabel ("http:"),
    lblcht = new JLabel("cht:"),lblchs = new JLabel("chs:"),
    lblchd = new JLabel("chd:"),lblchm = new JLabel("chm:"),
    lblchf = new JLabel("chf:");

  private MyCanvas thePicture = new MyCanvas();
  // Widget for displaying the image

  // Constructor: lays out the display
  public DrawImageCentered() {
    Container contentPane = getContentPane();
    contentPane.setLayout(new FlowLayout());
    contentPane.add(lblhttp); contentPane.add(addressField);
    contentPane.add(lblcht); contentPane.add(appendFieldcht);
    contentPane.add(lblchs); contentPane.add(appendFieldchs);
    contentPane.add(lblchd); contentPane.add(appendFieldchd);
    contentPane.add(lblchm); contentPane.add(appendFieldchm);
    contentPane.add(lblchf); contentPane.add(appendFieldchf);
    contentPane.add(thePicture);

    contentPane.add(choice1);
    choice1.addActionListener(this);

    contentPane.add(choice2);
    choice2.addActionListener(this);

    contentPane.add(choice3);
    choice3.addActionListener(this);
  } // DrawImage constructor

  // actionPerformed: get picture to display and notify
  // the canvas
  public void actionPerformed(ActionEvent e) {

    if(e.getSource() == choice1){ // get image from google
      // address
      String urlGoogleDrw = addressField.getText()+"cht="+
        appendFieldcht.getText().trim()+"&chs="+
        appendFieldchs.getText().trim()+"&chd="+
        appendFieldchd.getText().trim()+"&chm="+
        appendFieldchm.getText().trim()+"&chf="+
        appendFieldchf.getText().trim();

      try {
        // Read from assembled URL
        System.out.println(urlGoogleDrw);
        URL url = new URL(urlGoogleDrw);
        image = ImageIO.read(url);
        thePicture.setImage(image);
      }
      catch (IOException em) {
        System.out.println("import Data: I/O exception");
      }
      System.out.println
      ("Now press Save Image Button if you want to save it");

    } //choice 1
    if(e.getSource() == choice2){
      try {
        System.out.println("inside of Save it");
        Date dNow = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat
        ("yyMMddHHmmssZ");
        String df = new String(formatter.format(dNow));
        File file =
        new File("C:/Documents and Settings/bH/Desktop/"
           + df + " imageFromGoogle.png");
        ImageIO.write(image, "png", file);
        System.out.println
        ("finished writing, see Desktop file");
      }
      catch (IOException et) {
      }
    } //choice 2
    if(e.getSource() == choice3){
      System.exit(0);

    } //choice 3
  } // action draw picture

  /* Class MyCanvas: to display a chosen image.
   The image to be displayed is notified to this class by
   calling its setImage method.

   Constructor: only need to set up the size here,
   so the layout manager knows
   */
  class MyCanvas extends Canvas {

    public MyCanvas() {
      setBackground(Color.pink);
      // This let us see how big the canvas is!
      setSize(300,400);
    } // MyCanvas constructor

    private Image image; // The image on display just
    //now (nothing initially)

    // Set a new image to be displayed, and
    // refresh the canvas on-screen
    public void setImage(Image newImage) {
      image = newImage;
      repaint();
    } // setImage

    // And this actually draws the image, centered in
    // the canvas
    public void paint(Graphics g) {
      if (image != null) {
        // Make sure that there is an image
        int xOffset = (getWidth()-image.getWidth(this))/2;
        // x and y offsets to center the image in the
        // canvas
        int yOffset =
        (getHeight()-image.getHeight(this))/2;
        g.drawImage(image, xOffset, yOffset, this);
        // Note: Coordinates relative to this Canvas widget
      }
    } // paint
  } // class MyCanvas
}