/* Cylinder.java Generate a cylinder for Java3D
History:
04 Oct 2005 Decrease heap use. Label some constants.
30 Sep 2005 Created from Sun's Cylinder.java except make it
stretch along x-axis instead of y-axis, don't
bother with x and z offsets, and optimize a bit.
*/
import javax.media.j3d.*;
import javax.vecmath.*;
public class Cylinder {
public final static int VERTEXES_PER_QUAD = 4;
public final static int COORDINATES_PER_VERTEX = 3;
public final static int COORDINATES_PER_QUAD =
VERTEXES_PER_QUAD*
COORDINATES_PER_VERTEX;
Shape3D shape;
public Cylinder(double radius, double length, int quality, Appearance a) {
if (quality < 3) quality = 3;
double inc = 2.0*Math.PI/(double)quality;
QuadArray quad =
new QuadArray(quality*VERTEXES_PER_QUAD,
QuadArray.COORDINATES | QuadArray.NORMALS );
float data[] = new float[COORDINATES_PER_QUAD];
float ny2 = 0.0f;
float nz2 = 1.0f;
float y2 = 0.0f;
float z2 = (float)radius;
for (int i = 0; i < quality; i++) {
float ny1 = ny2;
float nz1 = nz2;
ny2 = (float)Math.sin((i + 1)*inc);
nz2 = (float)Math.cos((i + 1)*inc);
float y1 = y2;
float z1 = z2;
y2 = (float)radius * ny2;
z2 = (float)radius * nz2;
data[0] = 0.0f;
data[1] = y1;
data[2] = z1;
data[3] = (float)length;
data[4] = y1;
data[5] = z1;
data[6] = (float)length;
data[7] = y2;
data[8] = z2;
data[9] = 0.0f;
data[10] = y2;
data[11] = z2;
quad.setCoordinates(i*VERTEXES_PER_QUAD, data);
data[0] = 0.0f;
data[1] = ny1;
data[2] = nz1;
data[3] = 0.0f;
data[4] = ny1;
data[5] = nz1;
data[6] = 0.0f;
data[7] = ny2;
data[8] = nz2;
data[9] = 0.0f;
data[10] = ny2;
data[11] = nz2;
quad.setNormals(i*VERTEXES_PER_QUAD, data);
}
shape = new Shape3D(quad, a);
}
Shape3D getShape(){
return shape;
}
}