fireworks
/* ---------------------------------------------------------------------------------
* Fireworks applet, Copyright (c) 1995 Erik Wistrand, All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for NON-COMMERCIAL purposes and without fee is hereby
* granted provided that this copyright notice and appropiate documention
* appears in all copies.
*
* ERIK WISTRAND MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE
* SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT
* LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. ERIK WISTRAND SHALL NOT BE LIABLE
* FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*
* ---------------------------------------------------------------------------------
* fireworks applet v2.0f (beta API)
*
* Supported actions
* - mouseDown()
* applet is restarted
*
* Supported tags</h3>
* - ROCKETS n
* Number of rockets to animate (default 3)
* - POINTS n
* Number of points in each rocket (default 3)
* - POINTSIZE n
* Pixelsize of points (default 2)
* - LIFELENGTH n
* Duration of rockets, counted in number of frames (default 100)
* - GRAV n
* Gravity. Large value => rockets fall down fast (default 10)
* - DELAY n
* Delay in milliseconds between frames (default 50)
* (Warning: delay=0 consumes a lot of browser cpu time)
* - TRAIL n
* Number of trailing points (default 10)
* - COLOR rrggbb
* RGB hex triple for applet background (default browser background)
* - WIDTH n
* java.applet.Applet size().width in pixels (default tiny = browser default?)
* - HEIGHT n
* java.applet.Applet size().height in pixels (default tiny = browser default?)
*
*
* Comments or problems with the fireworks applet?
* Contact me at:
*
* wistrand@cs.chalmers.se
* URL: http://www.cs.chalmers.se/~wistrand
*
*/
import java.awt.Graphics;
import java.awt.Color;
class Bullet {
double xx;
double yy;
double x[] = null;
double y[] = null;
double dx;
double dy;
double g;
double f = 1.0f;
int lastx = 0;
int lasty = 0;
int dotsize;
int _trail = 10;
int _life_len = 100;
int t = 0;
int t2 = 0;
int count = 0;
Color col = Color.black;
Color remcol = Color.white;
double xmax;
double ymax;
Bullet(int x0,
int y0,
double dx0,
double dy0,
double g0,
int size,
int w,
int h,
int trail,
int life_len,
Color fg,
Color bg)
{
col = fg;
remcol = bg;
_trail = trail;
_life_len = life_len;
t = 0;
t2 = 1;
x = new double [_trail];
y = new double [_trail];
int i;
for(i = 0; i < _trail; i++)
{
x[i] = -dotsize * 2.0f;
y[i] = -dotsize * 2.0f;
}
xx = x0;
yy = y0;
dx = dx0;
dy = dy0;
g = g0;
dotsize = size;
xmax = w;
ymax = h;
}
void move()
{
xx += dx;
yy += dy;
dx *= f;
dy *= f;
dy += g;
}
boolean draw(Graphics g)
{
if(count++ < _life_len)
{
x[t] = xx;
y[t] = yy;
int sx = (int)xx;
int sy = (int)yy;
g.setColor(col);
g.fillRect(sx, sy, dotsize, dotsize);
t++;
if(t >= _trail) t = 0;
return ((sx >= 0) && (sy >= 0) &&
(sx < xmax) && (sy < ymax));
}
return (t2 != t);
}
void undraw(Graphics g)
{
int sx = (int)x[t2];
int sy = (int)y[t2];
t2++;
if(t2 >= _trail) t2 = 0;
g.setColor(remcol);
g.fillRect(sx, sy, dotsize, dotsize);
}
void clearall(Graphics g)
{
int i = 0;
while(i < _trail)
{
undraw(g);
i++;
}
}
}
class Rocket {
Bullet bullets[];
int _nof_bullets;
int _xmax;
int _ymax;
int _size;
double _g;
int _trail;
int _life_len;
Color _fg;
Color _bg;
Rocket(int nof_points,
int x0,
int y0,
double dx0,
double dy0,
double g,
int dotsize,
int w,
int h,
int trail,
int life_len,
Color fg,
Color bg)
{
_fg = fg;
_bg = bg;
_nof_bullets = nof_points;
_g = g;
_xmax = w;
_ymax = h;
_size = dotsize;
_trail = trail;
_life_len = life_len;
bullets = new Bullet[_nof_bullets];
reinit(x0, y0, dx0, dy0);
}
void reinit(int x0,
int y0,
double dx0,
double dy0)
{
int i;
for(i = 0; i < _nof_bullets; i++)
{
double a = Math.random() * 2.0f * 3.1415f;
double r = Math.random() * 1.0f;
double dx = Math.cos(a) * r;
double dy = Math.sin(a) * r;
bullets[i] = new Bullet(x0, y0,
dx0 + dx,
dy0 + dy,
_g,
_size,
_xmax, _ymax,
_trail,
_life_len,
_fg, _bg);
}
}
void draw(Graphics g)
{
int i;
boolean inside = false;
for(i = 0; i < _nof_bullets; i++)
{
inside = bullets[i].draw(g) || inside;
bullets[i].move();
}
if(!inside)
{
int x0 = 10 + (int)(Math.random() * (double)(_xmax - 20));
int y0 = _ymax - (int)(Math.random() * 20.0f);
double dx0 = (Math.random() - 0.5f) * 2.0f;
double dy0 = -(Math.random() * 6);
reinit(x0, y0, dx0, dy0);
}
}
void update(Graphics g)
{
int i;
boolean inside = false;
for(i = 0; i < _nof_bullets; i++)
{
bullets[i].undraw(g);
bullets[i].move();
inside = bullets[i].draw(g) || inside;
}
if(!inside)
{
int x0 = 10 + (int)(Math.random() * (double)(_xmax - 20));
int y0 = _ymax - (int)(Math.random() * 20.0f);
double dx0 = (Math.random() - 0.5f) * 2.0f;
double dy0 = -(Math.random() * 6);
for(i = 0; i < _nof_bullets; i++)
{
bullets[i].clearall(g);
}
reinit(x0, y0, dx0, dy0);
}
}
}
public class fireworks extends java.applet.Applet implements Runnable {
int nof_rockets = 3;
int delay = 50;
int nof_points = 20;
int trail = 10;
int dotsize = 2;
int life_len = 100;
double g = 0.0f;
Thread kicker = null;
Rocket rockets[] = null;
int clear = 0;
boolean first = true;
Color bg = Color.black;
Color parseCol(String s)
{
if(s.length() >= 6)
{
String sr = s.substring(0, 2);
String sg = s.substring(2, 4);
String sb = s.substring(4, 6);
int r, g, b;
try {
r = Integer.parseInt(sr, 16);
} catch(Exception e) {
r = 0;
}
try {
g = Integer.parseInt(sg, 16);
} catch(Exception e) {
g = 0;
}
try {
b = Integer.parseInt(sb, 16);
} catch(Exception e) {
b = 0;
}
return new java.awt.Color(r, g, b);
}
return new java.awt.Color(128, 128, 128);
}
public void init() {
int i;
try {
nof_rockets = Integer.parseInt(getParameter("ROCKETS"));
} catch(Exception e) {
nof_rockets = 3;
}
try {
delay = Integer.parseInt(getParameter("DELAY"));
} catch(Exception e) {
delay = 50;
}
try {
trail = Integer.parseInt(getParameter("TRAIL"));
} catch(Exception e) {
trail = 10;
}
try {
life_len = Integer.parseInt(getParameter("LIFELENGTH"));
} catch(Exception e) {
life_len = 100;
}
try {
nof_points = Integer.parseInt(getParameter("POINTS"));
} catch(Exception e) {
nof_points = 3;
}
try {
dotsize = Integer.parseInt(getParameter("POINTSIZE"));
} catch(Exception e) {
dotsize = 2;
}
try {
g = (double)Integer.parseInt(getParameter("GRAV")) / 1000.0f;
} catch(Exception e) {
g = .01f;
}
String bgcol = getParameter("COLOR");
if(bgcol != null)
{
bg = parseCol(bgcol);
}
rockets = new Rocket[nof_rockets];
initrockets();
}
void initrockets()
{
int i;
for(i = 0; i < nof_rockets; i++)
{
int x = 10 + (int)(Math.random() * (double)(size().width - 20));
int y = size().height - (int)(Math.random() * 20.0f);
double dx = (Math.random() - 0.5f) * 2.0f;
double dy = -(Math.random() * 6);
Color fg ;
double cs = Math.random();
if(cs < .33f)
{
fg = new java.awt.Color(155 + (int)(Math.random() * 100),
10, 10);
}
else if(cs < .66f)
{
fg = new java.awt.Color(155 + (int)(Math.random() * 100),
155 + (int)(Math.random() * 100),
10);
}
else
{
fg = new java.awt.Color(10, 10,
155 + (int)(Math.random() * 100));
}
rockets[i] = new Rocket(nof_points, x, y, dx, dy, g,
dotsize, size().width, size().height, trail, life_len,
fg,
bg);
}
}
public void paint(Graphics g) {
int i;
g.setColor(Color.white);
g.drawRect(0, 0, size().width - 1, size().height - 1);
g.setColor(bg);
g.fillRect(0, 0, size().width - 1, size().height - 1);
g.clipRect(2, 2, size().width - 4, size().height - 4);
for(i = 0; i < nof_rockets; i++)
{
rockets[i].draw(g);
}
}
public void update(Graphics g)
{
int i;
if(clear == 0)
{
g.clipRect(2, 2, size().width - 4, size().height - 4);
for(i = 0; i < nof_rockets; i++)
{
rockets[i].update(g);
}
} else {
g.clearRect(0, 0, size().width, size().height);
paint(g);
clear = 0;
}
}
public boolean mouseDown(java.awt.Event evt, int x, int y)
{
clear = 1;
initrockets();
return true;
}
public void run()
{
int dx = 1;
while(kicker != null) {
repaint();
try {
Thread.sleep(delay);
} catch(Exception e) {
;
}
}
}
public void start()
{
if(kicker == null)
{
kicker = new Thread(this);
kicker.setPriority(kicker.MIN_PRIORITY);
kicker.start();
}
}
public void stop()
{
kicker = null;
}
}
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