// Sunday, Nov. 3, 2003, by Yamin Li, yamin@k.hosei.ac.jp
// Free to use, modify, and distribute.
import java.awt.Graphics;
import java.awt.Color;
import java.lang.Math;

public class Needle{
    private Color color;
    private int width, length, balance, center;
    private double angle;
    static double pi = 3.1415926535f;
    public Needle(Color inColor, int inWidth, int inLength, int inBalance, int inCenter){
        color = inColor;
        width = inWidth;
        length = inLength;
        balance = inBalance;
        center = inCenter;
    }

    public void setAngle(double inAngle){
        angle = 2 * pi * inAngle/360.0;
    }

    public void drawNeedle(Graphics g){
        int x0, y0, x1, y1, dx, dy;
        x1 = center + (int)(length * Math.cos(angle));
        y1 = center + (int)(length * Math.sin(angle));
        x0 = center + (int)(balance * Math.cos(pi + angle));
        y0 = center + (int)(balance * Math.sin(pi + angle));
        dx = (int)(width * Math.cos(pi/2.0 - angle));
        dy = (int)(width * Math.sin(pi/2.0 - angle));
        drawPoly(g, x1, y1, x0 - dx, y0 + dy, x0 + dx, y0 - dy);
    }

    private void drawPoly(Graphics g, int x1, int y1, int x2, int y2, int x3, int y3){
        int x[] = {x1, x2, x3, x1};
        int y[] = {y1, y2, y3, y1};
        g.setColor(color);
        g.fillPolygon(x, y, 4);
        g.setColor(Color.black);
        g.drawPolygon(x, y, 4);
        g.setColor(Color.gray);
        g.fillOval(center - 9, center - 9, 19, 19);
        g.setColor(Color.black);
        g.drawOval(center - 9, center - 9, 19, 19);
        g.drawLine(center - 1, center - 1, center + 1, center - 1);
        g.drawLine(center - 1, center, center + 1, center);
        g.drawLine(center - 1, center + 1, center + 1, center + 1);
    }
}