我复制了一个用Java绘制样条曲线的程序，但它并不像我想的那样顺畅。这是程序（它实际上合并了我刚才提到的程序和我从别处复制的另一个程序）。
import java.applet.Applet;
import java.awt.BorderLayout; // Using AWT containers and components
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.CubicCurve2D;
import java.awt.geom.Point2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.xy.XYSplineRenderer;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.math3.analysis.interpolation.SplineInterpolator;
import edu.umd.cs.piccolo.nodes.PPath;
// Using AWT events and listener interfaces
// Using Swing components and containers
/**
*
* @author User
*/
public class SplinePanel extends Applet{
public JPanel createContentPane(){
// This is where we'll put all our widgets
// in the next tutorials!
JPanel panel = new JPanel();
/*
SplineFactory s = new SplineFactory();
double[] c = new double[12];
c[0] = 0.0; // x0
c[1] = 0.0; // y0
c[2] = 0.0; // z0
c[3] = 1.0; // x1
c[4] = 1.0; // y1
c[5] = 0.0; // z1
c[6] = 2.0; // x2
c[7] = -1.0; // y2
c[8] = 0.0; // z2
c[9] = 10.0; // x3
c[10] = 0.0; // y3
c[11] = 0.0; // z3
double[] spline1 = SplineFactory.createBezier (c, 20);
double[] spline2 = SplineFactory.createCubic (c, 20);
double[] spline3 = SplineFactory.createCatmullRom (c, 20);
/*
System.out.println ("-- Bezier");
for (int i = 0; i < spline1.length; i+=3)
System.out.println (spline1[i] + "," + spline1[i+1] + "," + spline1[i+2]);
System.out.println ("-- Cubic");
for (int i = 0; i < spline2.length; i+=3)
System.out.println (spline2[i] + "," + spline2[i+1] + "," + spline2[i+2]);
System.out.println ("-- Catmull-Rom");
for (int i = 0; i < spline3.length; i+=3)
System.out.println (spline3[i] + "," + spline3[i+1] + "," + spline3[i+2]);
*/
panel.setLayout(new BorderLayout());
XYSeries series = new XYSeries("MyGraph");
/*
System.out.println ("-- Bezier");
for (int i = 0; i < spline1.length; i+=3)
System.out.println (spline1[i] + "," + spline1[i+1] + "," + spline1[i+2]);
// series.add(spline1[i])
System.out.println ("-- Cubic");
for (int i = 0; i < spline2.length; i+=3)
System.out.println (spline2[i] + "," + spline2[i+1] + "," + spline2[i+2]);
System.out.println ("-- Catmull-Rom");
for (int i = 0; i < spline3.length; i+=3)
System.out.println (spline3[i] + "," + spline3[i+1] + "," + spline3[i+2]);
*/
/*
series.add(0, 1);
series.add(1, 2);
series.add(2, 5);
series.add(7, 8);
series.add(9, 10);
*/
/*
double[] x = new double[5];
double[] y = new double[5];
x[0] = 0;
x[1] = 2;
x[2] = 2;
x[3] = 7;
x[4] = 9;
y[0] = 1;
y[1] = 2;
y[2] = 5;
y[3] = 8;
y[4] = 10;
SplineInterpolator s = new SplineInterpolator();
CubicCurve2D c = new CubicCurve2D.Double();
// draw CubicCurve2D.Double with set coordinates
*
*/
/*
c.setCurve(x1, y1, ctrlx1,
ctrly1, ctrlx2, ctrly2, x2, y2);
*/
/*
c.setCurve(x[0], x[0], x[2],
y[2], x[3], y[3], x[4], y[4]);
Graphics2D g2 = (Graphics2D)g;
g2.draw(c);
*/
/*
List<Point2D> points = new ArrayList<Point2D>();
// Collect points
Shape shape = new CurveCreator().getShape(points);
PPath p = new PPath();
p.setPathTo(shape);
*/
series.add(0, 1);
series.add(1, 2);
series.add(2, 5);
series.add(7, 8);
series.add(9, 10);
XYSeriesCollection dataset = new XYSeriesCollection();
dataset.addSeries(series);
JFreeChart chart = ChartFactory.createXYLineChart(
"XY Chart",
"x-axis",
"y-axis",
dataset,
PlotOrientation.VERTICAL,
true,
true,
false
);
ChartPanel chartPanel = new ChartPanel(chart);
chart.getXYPlot().setRenderer(new XYSplineRenderer());
panel.add(chartPanel);
//panel.setSize(800, 500);
//content panes must be opaque
panel.setOpaque(true);
return panel;
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D)(g);
CubicCurve2D c = new CubicCurve2D.Double();
// draw CubicCurve2D.Double with set coordinates
/*
c.setCurve(x1, y1, ctrlx1,
ctrly1, ctrlx2, ctrly2, x2, y2);
*/
double[] x = new double[5];
double[] y = new double[5];
x[0] = 0;
x[1] = 2;
x[2] = 2;
x[3] = 7;
x[4] = 9;
y[0] = 1;
y[1] = 2;
y[2] = 5;
y[3] = 8;
y[4] = 10;
c.setCurve(x[0], x[0], x[2],
y[2], x[3], y[3], x[4], y[4]);
g2.scale(5.0, 5.0);
g2.draw(c);
}
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("[=] There's a JPanel in here! [=]");
//Create and set up the content pane.
SplinePanel demo = new SplinePanel();
frame.setContentPane(demo.createContentPane());
// The other bits and pieces that make our program a bit more stable.
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(1300, 650);
frame.setVisible(true);
/*
Graphics g = demo.getGraphics();
demo.paint(g);
*/
JFrame jp1 = new JFrame();
jp1.getContentPane().add(demo, BorderLayout.CENTER);
jp1.setSize(new Dimension(500,500));
jp1.setVisible(true);
jp1.getContentPane().add(demo, BorderLayout.CENTER);
jp1.setSize(new Dimension(500,500));
jp1.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
答案 0 :(得分：4)
将XYSplineRenderer的“精度”设置为更大的值将增加平滑度。玩10,15,20,100等。
XYSplineRenderer xySplineRenderer = new XYSplineRenderer();
xySplineRenderer.setPrecision(15);
答案 1 :(得分：3)
您也可以使用此字符串：
XYSplineRenderer xySplineRenderer = new XYSplineRenderer(15);