LACS02_Polar.java

/**
Polar.java  MrG 2012.0529
purpose:    test graphics.jar by making polar graphs!
required files: Polar.java          main class
        StdDraw.java                graphics class
translator: javac Polar.java
interperter:    java Polar
*/
public class Polar
{
    public static void main(String[] args)
    {
        StdDraw.setXscale(-2,+2);
        StdDraw.setYscale(-2,+2);

        double x0 = 1;
        double y0 = 0;

        StdDraw.setPenColor(StdDraw.RED);
        StdDraw.setPenRadius(.02);

        for(double t=0.0; t<=360.0; t+=2)
        {
            double theta = Math.toRadians(t);
            double r = 1+0.9*Math.sin(theta);
            double x1 = r*Math.cos(theta);
            double y1 = r*Math.sin(theta);
            StdDraw.line(x0,y0,x1,y1);
            x0=x1;
            y0=y1;
        }
    }
}