Name: tb29552 Date: 10/29/98
/*
drawImage is very slow in JDK 1.2rc1. My "Plasma" benchmark at
http://rsb.info.nih.gov/plasma/ runs at 1/2 speed compared to JDK 1.1.7.
Details:
JDK 1.1.7 speed: 89 frames per second
JDK 1.2rc1 speed: 46 frames per second
OS: Windows 95
Machine: P2/400, 64MB
Graphics: ATI 3D Rage Pro
Display depth: 16-bits
Source code is at:
http://rsb.info.nih.gov/plasma/source.html
This applet creates an animated display by summing four
sine waves into an array. Example FPS rates are at
http://rsb.info.nih.gov/plasma.
It is based on "Sam's Java Plasma Applet"
(http://www.dur.ac.uk/~d405ua/Plasma.html) by Sam Marshall
(###@###.###). It was modified to use 8-bit images
by Menno van Gangelen (###@###.###).
Here is what the applet tag used to run
the Plasma benchmark looks like:
<applet code="Plasma.class" width=320 height=240>
<param name=scale value="2">
<param name=showfps value="true">
</applet>
*/
import java.awt.*;
import java.awt.image.*;
public class Plasma extends java.applet.Applet implements Runnable {
Image img;
Thread runThread;
long firstFrame, frames, fps;
int width, height;
int w,h,size;
int scale=3;
boolean showFPS = true;
IndexColorModel icm;
int[] waveTable;
byte[][] paletteTable;
byte[] pixels;
public void init() {
width = size().width;
height = size().height;
String p = getParameter("scale");
if (p != null)
scale = Integer.parseInt(p);
p = getParameter("showfps");
if (p != null)
showFPS = p.equals("true");
w = width/scale;
h = w;
size = (int) ((w+h)/2)*4;
pixels = new byte[w*h];
waveTable = new int[size];
paletteTable = new byte[3][256];
calculatePaletteTable();
img=createImage(new MemoryImageSource(w,h,icm,pixels,0,w));
}
public void start() {
if (runThread == null) {
runThread=new Thread(this);
runThread.start();
firstFrame=System.currentTimeMillis();
frames = 0;
};
}
public void stop() {
if (runThread != null) {
runThread.stop();
runThread=null;
}
}
public void update(Graphics g) {
img.flush();
g.drawImage(img, 0, 0, width, height, null);
if (showFPS) {
frames++;
fps = (frames*10000) / (System.currentTimeMillis()-firstFrame);
g.drawString(fps/10 + "." + fps%10 + " fps", 2, height - 2);
}
}
void calculateWaveTable() {
for(int i=0;i<size;i++)
waveTable[i]=(int)(32*(1+Math.sin(((double)i*2*Math.PI)/size)));
}
int FadeBetween(int start,int end,int proportion) {
return ((end-start)*proportion)/128+start;
}
void calculatePaletteTable() {
for(int i=0;i<128;i++) {
paletteTable[0][i]=(byte)FadeBetween(0,255,i);
paletteTable[1][i]=(byte)0;
paletteTable[2][i]=(byte)FadeBetween(255,0,i);
}
for(int i=0;i<128;i++) {
paletteTable[0][i+128]=(byte)FadeBetween(255,0,i);
paletteTable[1][i+128]=(byte)0;
paletteTable[2][i+128]=(byte)FadeBetween(0,255,i);
}
icm = new IndexColorModel(8, 256, paletteTable[0], paletteTable[1], paletteTable[2]);
}
public void run() {
int x,y;
int index;
int tempval,result;
int spd1=2,spd2=5,spd3=1,spd4=4;
int pos1=0,pos2=0,pos3=0,pos4=0;
int tpos1,tpos2,tpos3,tpos4;
int inc1=6,inc2=3,inc3=3,inc4=9;
runThread.setPriority(Thread.MIN_PRIORITY);
calculateWaveTable();
while(true) {
index=0;
tpos1=pos1; tpos2=pos2;
for(y=0;y<h;y++) {
tpos3=pos3; tpos4=pos4;
tpos1%=size; tpos2%=size;
tempval=waveTable[tpos1] + waveTable[tpos2];
for(x=0;x<w;x++) {
tpos3%=size; tpos4%=size;
result=tempval + waveTable[tpos3] + waveTable[tpos4];
pixels[index++]=(byte)result;
tpos3+=inc3; tpos4+=inc4;
}
tpos1+=inc1; tpos2+=inc2;
}
pos1+=spd1; pos2+=spd2; pos3+=spd3; pos4+=spd4;
repaint();
Thread.yield();
//try {Thread.sleep(10);}
//catch (InterruptedException e) { }
}
}
}
(Review ID: 41544)
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Java