JMSL Chart Programmer's Guide

Charting 3D Types >> Tube Plot

Tube Plot

Lines are drawn as flat, non 3D elements. Tubes are drawn 3D versions of lines.

Spiral Example

The tube is shaded using the spectral color map 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.

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