Tube Plot
Lines are drawn as flat, non 3D elements. Tubes are drawn as 3D versions of lines.
Spiral Example
A spiral is defined by the equations parameterized by:
t, 0 ≤ t ≤ 1
x(t) = (t + 0.6) cos(8πt)
y(t) = (t + 0.6) sin(8πt)
z(t) = t
The tube is shaded using the spectral
Colormap from the 2D charting package.
import com.imsl.chart3d.*;
import java.awt.Color;
public class SampleSpiral extends JFrameChart3D implements ColorFunction {
public SampleSpiral() {
Chart3D chart = getChart3D();
AxisXYZ axis = new AxisXYZ(chart);
axis.getAxisBox().setPaint(false);
int nSpiral = 400;
double xSpiral[] = new double[nSpiral];
double ySpiral[] = new double[nSpiral];
double zSpiral[] = new double[nSpiral];
for (int i = 0; i < nSpiral; i++) {
double t = 8.0 * Math.PI * i / (double)(nSpiral-1);
double r = 0.6 + (double)i / (double)(nSpiral-1);
xSpiral[i] = r * Math.cos(t);
ySpiral[i] = r * Math.sin(t);
zSpiral[i] = (double)i / (double)(nSpiral-1);
}
Data spiral = new Data(axis, xSpiral, ySpiral, zSpiral);
spiral.setDataType(spiral.DATA_TYPE_TUBE);
spiral.setLineWidth(2);
spiral.setColorFunction(this);
render();
}
public Color color(double x, double y, double z) {
return com.imsl.chart.Colormap.SPECTRAL.color(z);
}
public static void main(String args[]) throws Exception {
new SampleSpiral().setVisible(true);
}
}
If the function is defined by a set of points, the points in the xy-plane are triangulated. The resulting 3D triangles are plotted.
