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We start with a Java 1.0 version of an applet that reports the mouse.
frilled.cs.indiana.edu%pwd
/nfs/grouchy/home/user2/www/classes/a348-dger/t540/lectures/four
frilled.cs.indiana.edu%ls -ld *
-rw-r--r-- 1 dgerman 1430 Nov 5 18:23 MouseTest.java
-rw-r--r-- 1 dgerman 285 Nov 5 18:27 Nine.html
frilled.cs.indiana.edu%cat MouseTest*
import java.applet.*;
import java.awt.*;
public class MouseTest extends Applet {
Font courierFont;
String testString = "Test the mouse in here!";
public void init() {
courierFont = new Font("Courier",Font.BOLD+Font.ITALIC,14);
}
public void paint(Graphics g) {
g.setFont(courierFont);
// center the string
FontMetrics m = g.getFontMetrics();
int stringWidth = m.stringWidth(testString);
int width = (bounds().width - stringWidth )/2;
int height = bounds().height / 2;
// draw the string
g.setColor(Color.blue);
g.drawString(testString,width,height);
}
public boolean mouseDown(Event e,int x,int y) {
System.out.println("mouseDown at (" + x + "," + y + ")" );
return true;
}
public boolean mouseUp(Event e,int x,int y) {
System.out.println("mouseUp at (" + x + "," + y + ")" );
return true;
}
public boolean mouseMove(Event e,int x,int y) {
System.out.println("mouseMove at (" + x + "," + y + ")" );
return true;
}
public boolean mouseDrag(Event e,int x,int y) {
System.out.println("mouseDrag at (" + x + "," + y + ")" );
return true;
}
public boolean mouseEnter(Event e,int x,int y) {
System.out.println("mouseEnter at (" + x + "," + y + ")" );
return true;
}
public boolean mouseExit(Event e,int x,int y) {
System.out.println("mouseExit at (" + x + "," + y + ")" );
return true;
}
}
frilled.cs.indiana.edu%cat Mouse*.html
No match
frilled.cs.indiana.edu%ls
MouseTest.java Nine.html
frilled.cs.indiana.edu%clear
frilled.cs.indiana.edu%pwd
/nfs/grouchy/home/user2/www/classes/a348-dger/t540/lectures/four
frilled.cs.indiana.edu%ls -ld *
-rw-r--r-- 1 dgerman 1430 Nov 5 18:23 MouseTest.java
-rw-r--r-- 1 dgerman 285 Nov 5 18:27 Nine.html
frilled.cs.indiana.edu%cat Mouse*.java
import java.applet.*;
import java.awt.*;
public class MouseTest extends Applet {
Font courierFont;
String testString = "Test the mouse in here!";
public void init() {
courierFont = new Font("Courier",Font.BOLD+Font.ITALIC,14);
}
public void paint(Graphics g) {
g.setFont(courierFont);
// center the string
FontMetrics m = g.getFontMetrics();
int stringWidth = m.stringWidth(testString);
int width = (bounds().width - stringWidth )/2;
int height = bounds().height / 2;
// draw the string
g.setColor(Color.blue);
g.drawString(testString,width,height);
}
public boolean mouseDown(Event e,int x,int y) {
System.out.println("mouseDown at (" + x + "," + y + ")" );
return true;
}
public boolean mouseUp(Event e,int x,int y) {
System.out.println("mouseUp at (" + x + "," + y + ")" );
return true;
}
public boolean mouseMove(Event e,int x,int y) {
System.out.println("mouseMove at (" + x + "," + y + ")" );
return true;
}
public boolean mouseDrag(Event e,int x,int y) {
System.out.println("mouseDrag at (" + x + "," + y + ")" );
return true;
}
public boolean mouseEnter(Event e,int x,int y) {
System.out.println("mouseEnter at (" + x + "," + y + ")" );
return true;
}
public boolean mouseExit(Event e,int x,int y) {
System.out.println("mouseExit at (" + x + "," + y + ")" );
return true;
}
}
frilled.cs.indiana.edu%cat Nine*.html
<html>
<head><title>Testing the mouse...</title></head>
<body bgcolor=white>
Open up a Java console and test your mouse inside. <p>
<applet code="MouseTest.class" width=300 height=300>
</applet>
<p> Dedicated to Mighty Mouse.
</body>
</html>
frilled.cs.indiana.edu%
Here's the
applet in action (don't forget that you
need to open up a console). You obviously need to use your A201 knowledge to turn this (and what follows) into the 1.1 AWT.
frilled.cs.indiana.edu%pwd
/nfs/grouchy/home/user2/www/classes/a348-dger/t540/lectures/four
frilled.cs.indiana.edu%ls -ld MouseSta*.java Ten*
-rw-r--r-- 1 dgerman 1442 Nov 5 18:55 MouseStatus.java
-rw-r--r-- 1 dgerman 324 Nov 5 18:48 Ten.html
frilled.cs.indiana.edu%cat MouseStatus.java
import java.applet.*;
import java.awt.*;
public class MouseStatus extends Applet {
Font courierFont;
String testString = "Status reports mouse movement!";
public void init() {
courierFont = new Font("Courier",Font.BOLD+Font.ITALIC,12);
setBackground(Color.white);
}
public void paint(Graphics g) {
g.setFont(courierFont);
// center the string
FontMetrics m = g.getFontMetrics();
int stringWidth = m.stringWidth(testString);
int width = (bounds().width - stringWidth )/2;
int height = bounds().height / 2;
// draw the string
g.setColor(Color.red);
g.drawString(testString,width,height);
}
public boolean mouseDown(Event e,int x,int y) {
showStatus("mouseDown at (" + x + "," + y + ")" );
return true;
}
public boolean mouseUp(Event e,int x,int y) {
showStatus("mouseUp at (" + x + "," + y + ")" );
return true;
}
public boolean mouseMove(Event e,int x,int y) {
showStatus("mouseMove at (" + x + "," + y + ")" );
return true;
}
public boolean mouseDrag(Event e,int x,int y) {
showStatus("mouseDrag at (" + x + "," + y + ")" );
return true;
}
public boolean mouseEnter(Event e,int x,int y) {
showStatus("mouseEnter at (" + x + "," + y + ")" );
return true;
}
public boolean mouseExit(Event e,int x,int y) {
showStatus("mouseExit at (" + x + "," + y + ")" );
return true;
}
}
frilled.cs.indiana.edu%frilled.cs.indiana.edu%cat Ten.html
<html>
<head><title>This applet is more expressive...</title></head>
<body bgcolor=white>
<p> This mouse-watching applet is more expressive... </p>
<applet code="MouseStatus.class" width=300 height=300>
</applet>
<p> Mouse position is shown in the status bar. </p>
</body>
</html>
frilled.cs.indiana.edu%javac MouseStatus.java
Note: MouseStatus.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.
frilled.cs.indiana.edu%I guess, so far so good. Let's use the mouse input to make changes in the applet.
Here's a
different program that does just that.
There are only two new classes:
frilled.cs.indiana.edu%pwd
/nfs/grouchy/home/user2/www/classes/a348-dger/t540/lectures/four
frilled.cs.indiana.edu%ls -ld *.java
-rw-r--r-- 1 dgerman 1525 Nov 5 21:17 Drag.java
-rw-r--r-- 1 dgerman 721 Nov 5 21:13 DragRect.java
-rw-r--r-- 1 dgerman 1442 Nov 5 18:55 MouseStatus.java
-rw-r--r-- 1 dgerman 1430 Nov 5 18:23 MouseTest.java
-rw-r--r-- 1 dgerman 735 Nov 5 21:14 RectSprite.java
-rw-r--r-- 1 dgerman 758 Nov 5 21:16 Sprite.java
-rw-r--r-- 1 dgerman 400 Nov 5 21:14 Sprite2D.java
frilled.cs.indiana.edu%cat Drag.java
import java.applet.*;
import java.awt.*;
public class Drag extends Applet {
Font courierFont;
String testString = "Drag the Rectangle!";
DragRect r = new DragRect(0,0,107,103,Color.red);
public void init() {
courierFont = new Font("Courier",Font.BOLD+Font.ITALIC,14);
setBackground(Color.white);
}
public void paint(Graphics g) {
g.setFont(courierFont);
// center the string
FontMetrics m = g.getFontMetrics();
int stringWidth = m.stringWidth(testString);
int width = (bounds().width - stringWidth )/2;
int height = bounds().height / 2;
// draw the string
g.setColor(Color.blue);
g.drawString(testString,width,height);
r.paint(g);
}
// if user clicks in the rectangle, make rectangle draggable
int oldx,oldy; // stores old mouse location
public boolean mouseDown(Event e,int x,int y) {
if (r.inside(x,y)) {
oldx = x;
oldy = y;
r.setDraggable(true);
}
return true;
}
// if mouseUp, rectangle is no longer draggable
public boolean mouseUp(Event e,int x,int y) {
r.setDraggable(false);
return true;
}
// translate the rectangle by the difference between
// the new mouse position and the old one
public boolean mouseDrag(Event e,int x,int y) {
if (r.isDraggable()) {
r.translate(x-oldx,y-oldy); // move rectangle
oldx = x; // store old mouse position
oldy = y;
repaint(); // redraw screen
}
return true;
}
}
frilled.cs.indiana.edu%cat DragRect.java
import java.applet.*;
import java.awt.*;
public class DragRect extends RectSprite {
protected boolean draggable; // is rectangle draggable?
public DragRect(int x,int y,int w,int h,Color c) {
super(x,y,w,h,c);
fill = true;
draggable = false; // initially not draggable
}
// check if (x,y) is inside rectangle
public boolean inside(int x,int y) {
return (locx <= x && locy <= y &&
(locx + width >= x) &&
(locy + height >= y));
}
// modify draggable
public void setDraggable(boolean b) {
draggable = b;
}
public boolean isDraggable() {
return draggable;
}
public void translate(int x,int y) {
locx += x;
locy += y;
}
}
frilled.cs.indiana.edu%cat Eleven.html
<html>
<head><title>Mouse Input Changes Applet</title></head>
<body bgcolor=white>
You can use your mouse to drag the red rectangle around. <p>
<applet code="Drag.class" width=300 height=300>
</applet>
<p> White on white you won't know when the rectangle is clipped
ahead of time. <p> Dedicated to Clifford, the Big Red Dog. <p>
</body>
</html>
frilled.cs.indiana.edu%javac Drag.java
Note: Drag.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.
frilled.cs.indiana.edu%Now let's add keyboard input, to change the size of the rectangle.
Start with a simple case (ignore the version, update the code):
frilled.cs.indiana.edu%pwd
/nfs/grouchy/home/user2/www/classes/a348-dger/t540/lectures/four
frilled.cs.indiana.edu%ls -ld Bisc*.java Twelv*.html
-rw------- 1 dgerman 1651 Nov 5 22:55 Biscayne.java
-rw-r--r-- 1 dgerman 329 Nov 5 22:57 Twelve.html
frilled.cs.indiana.edu%cat Bisc*.java
import java.applet.*;
import java.awt.*;
public class Biscayne extends Applet {
Font courierFont;
String testString = "Test keys and mouse in here!";
public void init() {
courierFont = new Font("Courier",Font.BOLD+Font.ITALIC,14);
}
public void paint(Graphics g) {
g.setFont(courierFont);
// center the string
FontMetrics m = g.getFontMetrics();
int stringWidth = m.stringWidth(testString);
int width = (bounds().width - stringWidth )/2;
int height = bounds().height / 2;
// draw the string
g.setColor(Color.blue);
g.drawString(testString,width,height);
}
public boolean mouseDown(Event e,int x,int y) {
System.out.println("mouseDown at (" + x + "," + y + ")" );
return true;
}
public boolean mouseUp(Event e,int x,int y) {
System.out.println("mouseUp at (" + x + "," + y + ")" );
return true;
}
public boolean mouseMove(Event e,int x,int y) {
System.out.println("mouseMove at (" + x + "," + y + ")" );
return true;
}
public boolean mouseDrag(Event e,int x,int y) {
System.out.println("mouseDrag at (" + x + "," + y + ")" );
return true;
}
public boolean mouseEnter(Event e,int x,int y) {
System.out.println("mouseEnter at (" + x + "," + y + ")" );
return true;
}
public boolean mouseExit(Event e,int x,int y) {
System.out.println("mouseExit at (" + x + "," + y + ")" );
return true;
}
public boolean keyDown(Event e,int key) {
System.out.println("keyDown is " + key );
return true;
}
public boolean keyUp(Event e,int key) {
System.out.println("keyUp is " + key );
return true;
}
}
frilled.cs.indiana.edu%cat Twelve*
<html>
<head><title>Test of Keys in Applet with Mouse... </title></head>
<body bgcolor=white>
Open up a console window and start using the mouse and the keyboard. <p>
<applet code="Biscayne.class" width=300 height=300>
</applet>
<p> Dedicated to Sergei Rachmaninov. <p>
</body>
</html>
frilled.cs.indiana.edu%We now move to the last part of Chapter Four, with the next set of notes.