package cannon;
/*########################################################################
*
* Auth: Sean E. Russell
* University of Oregon, CIS
* Date: Thu Aug 10 10:34:06 PDT 1995
*
* Synopsis:
*
* - Mon Aug 14 15:23:46 PDT 1995
* It's not my fault. I started this when Java was in it's Alpha-3
* release, when the documentation was non-existant, examples were
* scarce, and the AWT package was primative. I refuse to take any
* blame for injuries incurred while reading this code.
* That said, cannon is a Java class for HotJava which is supposed
* to provide an example of a simple gravity/velocity environment. The
* user has a cannon which he may shoot. He is able to vary the angle
* of the cannon and the velocity of the projectile, and view the
* results of his input. That's all it does so far, and it doesn't
* do it well. AWT is a nightmare.
*
* - Thu Aug 17 17:41:59 PDT 1995
* Well, considering what I had to go through to figure out how the
* layout engine behaves, the code doesn't look *too* bad. Sound and
* rudimentry animation has been added. As it is, I would consider
* this a usable app.
* Needing to be done: explosion for target and sounds for a miss.
* There are numerous cosmetic features that can be worked on, but
* I'll leave those until someone requests them.
*
* - Sun Aug 20 00:34:18 PDT 1995
* Ha! Perfection! The animation, the smoke trail; the sound...
* it even refreshes correctly. I don't like the way the code looks;
* it's very messy, and a lot of things are hardcode that shouldn't be.
* Due to the need for my services on a number of other projects, I'm
* not going to fix things like the dependancy on a small font size in
* the UI. Maybe later.
* I was harsh on AWT. Its not poorly designed; its just poorly
* documented. All in all, not bad for an Alpha release, even if the
* layout engine is unpredictable at times.
*
######################################################################*/
import java.awt.*;
import java.net.*;
import java.lang.Math;
import java.lang.Integer;
public class cannon extends java.applet.Applet
{
double dx, dy, theta, velocity, gravity, windage;
int xmax, ymax, numshots;
Color black, erase;
double x, y;
double xo[] = new double[4];
double yo[] = new double[4];
double rads;
boolean dosound;
CannonFrame frame;
Graphics drawarea;
Image can, shot, targ, targ2,
bang1, puff1, puff2, puff3, puff4;
public void more()
{
numshots = 4;
repaint();
}
public void shootShot()
{
if (numshots > 0)
{
numshots--;
play(getCodeBase(), "sounds/cannon.au");
dosound = true;
repaint();
}
}
public void loadImages()
{
can = getImage(getCodeBase(), "images/cannon.gif");
shot = getImage(getCodeBase(), "images/ammo.gif");
targ = getImage(getCodeBase(), "images/target.gif");
targ2 = getImage(getCodeBase(), "images/target2.gif");
bang1 = getImage(getCodeBase(), "images/bang1.gif");
puff1 = getImage(getCodeBase(), "images/puff1.gif");
puff2 = getImage(getCodeBase(), "images/puff2.gif");
puff3 = getImage(getCodeBase(), "images/puff3.gif");
puff4 = getImage(getCodeBase(), "images/puff4.gif");
}
public void init()
{
loadImages();
numshots = 4;
rads = 57.29577866f;
xmax = 600;
ymax = 300;
resize(xmax,ymax+20);
theta = 60; // degrees
theta /= rads; // -> radians
velocity = 3; // m/s x 10^-1
gravity = .098f; // m/s^2 x 10^-2
windage = 0;
black = Color.black;
erase = Color.blue;
frame = new CannonFrame(this);
}
public void changeAngle(int val)
{
Integer temp = new Integer(val);
theta = (double)val; // degrees
theta /= rads; // -> radians
frame.ang.setText(temp.toString());
}
public void changeVelocity(int val)
{
Integer temp = new Integer(val);
velocity = (double)val / 5;
frame.vel.setText(temp.toString());
}
public void changeGravity(int val)
{
Float temp = new Float((float)val / 10);
gravity = (double)val / 1000;
frame.grav.setText(temp.toString());
}
public void changeWindage(int val)
{
Integer temp = new Integer(val);
windage = (double)val / 200;
frame.wind.setText(temp.toString());
}
public void paint(Graphics g)
{
if (can == null) {
return;
}
drawarea = g;
//##### Cannon part
//##### Draw images
g.drawImage(can, 20, ymax - can.getHeight(this), this);
g.drawImage(targ, xmax - (targ.getWidth(this) + 10), ymax - targ.getHeight(this), this);
if (numshots > 3) g.drawImage(shot, 0, ymax - ((2*shot.getHeight(this))+2), this);
if (numshots > 2) g.drawImage(shot, 2 + shot.getWidth(this),
ymax - ((2*shot.getHeight(this))+2), this);
if (numshots > 1) g.drawImage(shot, 0, ymax - shot.getHeight(this), this);
if (numshots >0) g.drawImage(shot, 2 + shot.getWidth(this), ymax - shot.getHeight(this), this);
if (numshots < 4)
{
//##### Shoot da shot
x = 65;
y = ymax-55;
dx = velocity * Math.cos(theta);
dy = velocity * Math.sin(theta);
g.setColor(Color.gray);
while ((x > 0) && (x < xmax) && (y < ymax))
{
if (xo[3] != 0)
g.clearRect((int)xo[3] - 4, (int)yo[3] - 4, 8, 7);
if (xo[0] != 0)
g.drawRect((int)xo[0]-1, (int)yo[0]-1, 2, 2);
g.drawImage(shot, (int)x - 4, (int)y - 4, this);
if (x < 75) g.drawImage(can, 20, ymax - can.getHeight(this), this);
if ((x>xmax-(targ.getWidth(this)+10)) && (y>ymax-targ.getHeight(this)))
g.drawImage(targ, xmax - (targ.getWidth(this)+10),
ymax - targ.getHeight(this), this);
if (dosound)try {Thread.sleep(5);} catch (InterruptedException e){}
xo[0] = xo[1]; xo[1] = xo[2]; xo[2] = xo[3];
yo[0] = yo[1]; yo[1] = yo[2]; yo[2] = yo[3];
xo[3] = x; yo[3] = y;
x += dx;
dx -= windage/2;
y -= dy;
dy -= gravity/2;
//##### Check for hit
if ((x>(xmax-43)) && (x<(xmax-27)) &&
(y>(ymax-40)) && (y<(ymax-25)))
{
if (dosound)
{
play(getCodeBase(), "sounds/explosion.au");
//##### Draw FX
// Bang over full target
g.drawImage(bang1, xmax - (targ.getWidth(this)+10),
ymax - targ.getHeight(this), this);
// puff1 over targ2
try {Thread.sleep(75);} catch (InterruptedException e){}
g.clearRect(xmax-(targ.getWidth(this)+10), ymax-targ2.getHeight(this),
(targ.getWidth(this)+10), targ2.getHeight(this));
g.drawImage(targ2, xmax - (targ.getWidth(this)+10),
ymax - targ2.getHeight(this), this);
play(getCodeBase(), "sounds/applause.au");
g.drawImage(puff1, xmax - (targ.getWidth(this)+15),
ymax - (targ.getHeight(this)+40), this);
// Puff2 over targ2
try {Thread.sleep(75);} catch (InterruptedException e){}
g.clearRect(xmax-(targ.getWidth(this)+15),
ymax-(targ.getHeight(this)+40),
(targ.getWidth(this)+15), (targ.getHeight(this)+40));
g.drawImage(targ2, xmax - (targ.getWidth(this)+10),
ymax - targ2.getHeight(this), this);
g.drawImage(puff2, xmax - (targ.getWidth(this)+15),
ymax - (targ.getHeight(this)+40), this);
// puff3 over targ2
try {Thread.sleep(75);} catch (InterruptedException e){}
g.clearRect(xmax-(targ.getWidth(this)+15),
ymax-(targ.getHeight(this)+40),
(targ.getWidth(this)+15), (targ.getHeight(this)+40));
g.drawImage(targ2, xmax - (targ.getWidth(this)+10),
ymax - targ2.getHeight(this), this);
g.drawImage(puff3, xmax - (targ.getWidth(this)+10),
ymax - (targ.getHeight(this)+40), this);
// puff4 over targ2
try {Thread.sleep(75);} catch (InterruptedException e){}
g.clearRect(xmax-(targ.getWidth(this)+15),
ymax-(targ.getHeight(this)+40),
(targ.getWidth(this)+15), (targ.getHeight(this)+40));
g.drawImage(targ2, xmax - (targ.getWidth(this)+10),
ymax - targ2.getHeight(this), this);
g.drawImage(puff4, xmax - (targ.getWidth(this)+10),
ymax - (targ.getHeight(this)+40), this);
dosound = false;
try {Thread.sleep(75);} catch (InterruptedException e){}
}
// targ2
g.clearRect(xmax-(targ.getWidth(this)+15), ymax-(targ.getHeight(this)+40),
(targ.getWidth(this)+15), (targ.getHeight(this)+40));
g.drawImage(targ2, xmax - (targ.getWidth(this)+10),
ymax - targ2.getHeight(this), this);
x=0;
}
}
for (int i=0; i<4; i++) xo[i] = yo[i] = 0;
}
}
public void start()
{
if (frame != null)
{
frame.show();
}
}
public void stop()
{
if (frame != null)
{
frame.hide();
}
}
public void destroy()
{
if (frame != null)
{
frame.dispose();
frame = null;
}
}
}
class CannonFrame extends Frame {
cannon can;
TextField ang;
TextField vel;
TextField grav;
TextField wind;
Scrollbar s_ang;
Scrollbar s_vel;
Scrollbar s_grav;
Scrollbar s_wind;
CannonFrame(cannon can) {
this.can = can;
setTitle("Cannon");
Panel p;
add("North", p = new Panel());
p.add(new Label("Ang:"));
p.add(ang = new TextField("60", 4));
ang.setEditable(false);
p.add(new Label("Vel:"));
p.add(vel = new TextField("15", 4));
vel.setEditable(false);
p.add(new Label("Grav:"));
p.add(grav = new TextField("9.8", 4));
grav.setEditable(false);
p.add(new Label("Wind:"));
p.add(wind = new TextField("0", 4));
wind.setEditable(false);
add("Center", p = new Panel());
p.setLayout(new GridLayout(4, 0));
p.add(s_ang = new Scrollbar(Scrollbar.HORIZONTAL));
s_ang.setValues(60, 10, 1, 90);
p.add(s_vel = new Scrollbar(Scrollbar.HORIZONTAL));
s_vel.setValues(10, 2, 1, 30);
p.add(s_grav = new Scrollbar(Scrollbar.HORIZONTAL));
s_grav.setValues(98, 10, 40, 200);
p.add(s_wind = new Scrollbar(Scrollbar.HORIZONTAL));
s_wind.setValues(0, 1, -10, 10);
add("South", p = new Panel());
p.add(new Button("Shoot"));
p.add(new Button("More Ammo"));
pack();
//list();
}
public boolean handleEvent(Event evt) {
//System.out.println("evt = " + evt);
if (evt.target == s_ang) {
can.changeAngle(((Integer)evt.arg).intValue());
return true;
}
if (evt.target == s_vel) {
can.changeVelocity(((Integer)evt.arg).intValue());
return true;
}
if (evt.target == s_grav) {
can.changeGravity(((Integer)evt.arg).intValue());
return true;
}
if (evt.target == s_wind) {
can.changeWindage(((Integer)evt.arg).intValue());
return true;
}
if ("Shoot".equals(evt.arg)) {
can.shootShot();
return true;
}
if ("More Ammo".equals(evt.arg)) {
can.more();
return true;
}
return super.handleEvent(evt);
}
}
