HFJava_393_396.pdf

getting gui

public MidiEvent makeEvent(int comd, int chan, int one, int two, int tick) {

MidiEvent event = null;

try {

ShortMessage a = new ShortMessage();

a.setMessage(comd, chan, one, two);

event = new MidiEvent(a, tick);

}catch(Exception e) { }

return event;

} // close method

class MyDrawPanel extends JPanel implements ControllerEventListener {

boolean msg = false;

public void controlChange(ShortMessage event) {

msg = true;

repaint();

}

public void paintComponent(Graphics g) {

if (msg) {

Graphics2D g2 = (Graphics2D) g;

int r = (int) (Math.random() * 250);

int gr = (int) (Math.random() * 250);

int b = (int) (Math.random() * 250);

g.setColor(new Color(r,gr,b));

int ht = (int) ((Math.random() * 120) + 10);

int width = (int) ((Math.random() * 120) + 10);

int x = (int) ((Math.random() * 40) + 10);

int y = (int) ((Math.random() * 40) + 10);

g.ﬁllRect(x,y,ht, width);

msg = false;

} // close if

} // close method

} // close inner class

} // close class

you are here 4 393

puzzle: Pool Puzzle

import javax.swing.*;

import java.awt.*;

public class Animate {

int x = 1;

int y = 1;

public static void main (String[] args) {

Animate gui = new Animate ();

gui.go();

}

public void go() {

JFrame _________ = new JFrame();

frame.setDefaultCloseOperation(

JFrame.EXIT_ON_CLOSE);

______________________________________;

_________.getContentPane().add(drawP);

__________________________;

_________.setVisible(true);

for (int i=0; i<124; _______________) {

_____________________;

try {

Thread.sleep(50);

} catch(Exception ex) { }

}

class MyDrawP extends JPanel {

public void paintComponent (Graphic

_________) {

__________________________________;

}

Pool Puzzle

Your job is to take code snippets from

the pool and place them into the blank

lines in the code. You may use the

same snippet more than once,

and you won’t need to use all the

snippets. Your goal is to make a

class that will compile and run

and produce the output listed.

Output

The Amazing, Shrinking, Blue Rectangle.

This program will produce a blue

rectangle that will shrink and shrink and

disappear into a ﬁeld of white.

Note: Each snippet

from the pool can be

used more than once!

g.fillRect(x,y,x-500,y-250)

g.fillRect(x,y,500-x*2,250-y*2)

g.fillRect(500-x*2,250-y*2,x,y)

g.fillRect(0,0,250,500)

g.fillRect(0,0,500,250)

draw

frame

panel

i++

i++, y++

i++, y++, x++

Animate frame = new Animate()

MyDrawP drawP = new MyDrawP()

ContentPane drawP = new ContentPane()

x++

y++

g.setColor(blue)

g.setColor(white)

g.setColor(Color.blue)

g.setColor(Color.white)

drawP.paint()

draw.repaint()

drawP.repaint()

drawP.setSize(500,270)

frame.setSize(500,270)

panel.setSize(500,270)

396 chapter 12

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