HOW ARE GRAPHIC OBJECTS DISPLAYED IN JAVA?
Objective: Show a simple anatomical representation.
Overview:
Source code:
import java.applet.Applet;
import java.awt.*;
import java.io.*;
import java.net.URL;
// APPLET TO PUT 3D MODEL INTO PAGE - FROM WIREFRAME DEMO //
public class ThreeD extends Applet implements Runnable {
// INITIALIZATION //
public void init() {
mdname = getParameter("model");
try {
scalefudge = Float.valueOf(getParameter("scale")).floatValue();
}
resize(size().width <= 20 ? 400 : size().width,
size().height <= 20 ? 400 : size().height);
}
// READ INPUT STREAM AS SPECIFIED IN HTML DOC //
public void run() {
InputStream is = null;
try {
Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
is = new URL(getDocumentBase(), mdname).openStream();
Model3D m = new Model3D (is);
md = m;
float xw = m.xmax - m.xmin;
float yw = m.ymax - m.ymin;
float zw = m.zmax - m.zmin;
float f1 = size().width / xw;
float f2 = size().height / xw;
xfac = 0.7f * (f1 < f2 ? f1 : f2) * scalefudge;
}
repaint();
}
// CREATE 3D MODEL BY PARSING INPUT STREAM //
Model3D (InputStream is) throws IOException, FileFormatException {
this();
StreamTokenizer st = new StreamTokenizer(is);
scan:
while (true) {
switch (st.nextToken()) {
default:
break scan;
case StreamTokenizer.TT_EOL:
break;
case StreamTokenizer.TT_WORD:
if ("v".equals(st.sval)) {
double x = 0, y = 0, z = 0;
if (st.nextToken() == StreamTokenizer.TT_NUMBER) {
x = st.nval;
if (st.nextToken() == StreamTokenizer.TT_NUMBER) {
y = st.nval;
if (st.nextToken() == StreamTokenizer.TT_NUMBER)
z = st.nval;
}
}
addVert((float) x, (float) y, (float) z);
}
// ADD LINE FROM VERTEX P1 TO VERTEX P2 //
void add(int p1, int p2) {
int i = ncon;
if (i >= maxcon)
if (con == null) {
maxcon = 100;
con = new int[maxcon];
} else {
maxcon *= 2;
int nv[] = new int[maxcon];
System.arraycopy(con, 0, nv, 0, con.length);
con = nv;
}
if (p1 > p2) {
int t = p1;
p1 = p2;
p2 = t;
}
con[i] = (p1 << 16) | p2;
ncon = i + 1;
}
// PAINT MODEL TO GRAPHICS CONTEXT //
static Color gr[];
void paint(Graphics g) {
if (vert == null || nvert <= 0)
return;
transform();
if (gr == null) {
gr = new Color[16];
for (int i = 0; i < 16; i++) {
int grey = (int) (170*(1-Math.pow(i/15.0, 2.3)));
gr[i] = new Color(grey, grey, grey);
}
}
g.setColor(gr[grey]);
g.drawLine(v[p1], v[p1 + 1],v[p2], v[p2 + 1]);
}
}
HTML code:
<html>
<body>
<applet code=ThreeD.class width=300 height=400>
<param name=model1 value=femur3.txt>
<param name=model2 value=Limits2.txt>
<param name=scale value="1">
</applet>
</html>
</body>
Java Output:
Instructions:
Drag or click the mouse to change the orientation of the femur model.
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