在java中绘制极坐标图 [英] draw polar graph in java

问题描述

有谁知道我如何开始在java中绘制极坐标图，并在该图上绘制一些点？我的意思是圆圈和线条，我希望用swing之类的东西来做，而不是像Jfreechart那样使用任何类库
谢谢

解决方案

您可能会喜欢看利萨如曲线;下面显示了 a = 5，b = 4（5：4）的示例。

附录：一次您会看到如何在 xy 坐标中绘制点，那么您应该查看 在极坐标和笛卡尔坐标之间进行转换 。 b
$ b

$ b

  public class LissajousPanel extends JPanel {
 
 private static final int SIZE = 400; 
 private GeneralPath path = new GeneralPath（）; 
 
 @Override 
 public Dimension getPreferredSize（）{
 return new Dimension（SIZE，SIZE）; 
} 
 
 @Override 
 public void paintComponent（Graphics g）{
 super.paintComponent（g）; 
 Graphics2D g2d =（Graphics2D）g; 
 g2d.setRenderingHint（
 RenderingHints.KEY_ANTIALIASING，
 RenderingHints.VALUE_ANTIALIAS_ON）; 
 double dt = Math.PI / 180; 
 int w = getWidth（）/ 2; 
 int h = getHeight（）/ 2; 
 path.reset（）; 
 path.moveTo（w，h）; （double t = 0; t <2 * Math.PI; t + = dt）{
 double x = w * Math.sin（5 * t）+ w; 
; 
 double y = h * Math.sin（4 * t）+ h; 
 path.lineTo（x，y）; 
} 
 g2d.setColor（Color.blue）; 
 g2d.draw（path）; 
 
 
 public static void main（String [] args）{
 EventQueue.invokeLater（new Runnable（）{
 $ b $ @Override 
）public void run（）{
 JFrame f = new JFrame（）; 
 f.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 f.add（new LissajousPanel（））; 
 f.pack（）; 
 f.setVisible（true）; 
} 
}）; 
} 
} 
  

Does anyone know how I can get started to draw a polar graph in java and plot some points on this graph? I mean the circles and lines, I wish to do this with something like swing, and not use any library like Jfreechart Thanks

解决方案

You might like to look at Lissajous curves; an example of a = 5, b = 4 (5:4) is shown below.

Addendum: Once you see how to plot points in xy coordinates, then you should look at converting between polar and Cartesian coordinates.

public class LissajousPanel extends JPanel {

    private static final int SIZE = 400;
    private GeneralPath path = new GeneralPath();

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(SIZE, SIZE);
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(
            RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
        double dt = Math.PI / 180;
        int w = getWidth() / 2;
        int h = getHeight() / 2;
        path.reset();
        path.moveTo(w, h);
        for (double t = 0; t < 2 * Math.PI; t += dt) {
            double x = w * Math.sin(5 * t) + w;
            double y = h * Math.sin(4 * t) + h;
            path.lineTo(x, y);
        }
        g2d.setColor(Color.blue);
        g2d.draw(path);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame f = new JFrame();
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(new LissajousPanel());
                f.pack();
                f.setVisible(true);
            }
        });
    }
}

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