Example usage for java.lang Math PI

Introduction

In this page you can find the example usage for java.lang Math PI.

Prototype

double PI

To view the source code for java.lang Math PI.

Click Source Link

Document

The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.

Usage

From source file:org.eclipse.swt.snippets.Snippet209.java

static void drawTorus(GL gl, float r, float R, int nsides, int rings) {
    float ringDelta = 2.0f * (float) Math.PI / rings;
    float sideDelta = 2.0f * (float) Math.PI / nsides;
    float theta = 0.0f, cosTheta = 1.0f, sinTheta = 0.0f;
    for (int i = rings - 1; i >= 0; i--) {
        float theta1 = theta + ringDelta;
        float cosTheta1 = (float) Math.cos(theta1);
        float sinTheta1 = (float) Math.sin(theta1);
        gl.glBegin(GL.GL_QUAD_STRIP);/*  w  ww  . j  ava 2s  .  c  om*/
        float phi = 0.0f;
        for (int j = nsides; j >= 0; j--) {
            phi += sideDelta;
            float cosPhi = (float) Math.cos(phi);
            float sinPhi = (float) Math.sin(phi);
            float dist = R + r * cosPhi;
            gl.glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
            gl.glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi);
            gl.glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
            gl.glVertex3f(cosTheta * dist, -sinTheta * dist, r * sinPhi);
        }
        gl.glEnd();
        theta = theta1;
        cosTheta = cosTheta1;
        sinTheta = sinTheta1;
    }
}

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From source file:com.example.PJS.java

public static double N(double z) {
    /**/*from   w  ww  . j av a  2  s .c  o  m*/
    * Normal Distribution Function, PDF probability density function
    *Odegaard Dic 2003, page 129
    */
    double n = 1 / Math.sqrt(2 * Math.PI) * Math.exp(-0.5 * z * z);
    return n;
}

---

From source file:info.financialecology.finance.utilities.sandbox.SimpleStrategyFSM.java

public static void main(String[] args) {
    try {//from  w ww. j  av  a 2  s . co  m
        // Build FSM
        SimpleStrategyFSM strategyFSM = new SimpleStrategyFSM();
        StateMachine sm = strategyFSM.getStateMachine();

        int nTicks = 200; // Number of ticks
        double sinus_shift = 10.0;
        double sinus_amplitude = 10.0;
        double sinus_lambda = 50.0;

        double threshold5 = 0.05 * 2 * sinus_amplitude;
        double threshold50 = 0.5 * 2 * sinus_amplitude;
        double threshold95 = 0.95 * 2 * sinus_amplitude;

        logger.info(
                "Thresholds: [5%, " + threshold5 + "], [50%, " + threshold50 + "], [95%, " + threshold95 + "]");

        //double sinus_t_prev = sinus_amplitude + sinus_shift + sinus_amplitude * Math.sin(2 * 0 * Math.PI / sinus_lambda);
        double sinus_t_prev = sinus_shift + sinus_amplitude * Math.sin(2 * 0 * Math.PI / sinus_lambda);

        strategyFSM.start();

        for (int i = 1; i < nTicks; i++) {
            double sinus_t = sinus_amplitude + sinus_shift
                    + sinus_amplitude * Math.sin(2 * i * Math.PI / sinus_lambda);
            //double sinus_t = sinus_shift + sinus_amplitude * Math.sin(2 * i * Math.PI / sinus_lambda);

            logger.info("Tick: " + i + ", value: " + sinus_t);

            if ((sinus_t >= threshold95) && (sinus_t_prev < threshold95))
                strategyFSM.crossing95();

            if ((sinus_t >= threshold50) && (sinus_t_prev < threshold50)
                    || (sinus_t <= threshold50) && (sinus_t_prev > threshold50))
                strategyFSM.crossing50();

            if ((sinus_t <= threshold5) && (sinus_t_prev > threshold5))
                strategyFSM.crossing5();

            sinus_t_prev = sinus_t;
        }

        /*
                
        int window = 10;   // Window for the calculation of percentiles
        int nTicks = 200;  // Number of ticks
                
        double[] sinus = new double[nTicks];    // Price series (= sinus process)          
        double sinus_shift = 100.0;   // Parameters of the sinus process
        double sinus_amplitude = 20.0;
        double sinus_lambda = 50.0;         
                
                
        // Create a sinus price process to test the strategy
        for (int i = 0; i < nTicks; i++) {
           sinus[i] = sinus_shift + sinus_amplitude * Math.sin(2*i*Math.PI / sinus_lambda);
        }
                
        for (int i = 0; i < nTicks; i++) {
           if (i < window)
        positions.add(0);
           else {
        DescriptiveStatistics   stats = new DescriptiveStatistics();
        for (int j = i-window+1; j <= i; j++) {
               stats.addValue(sinus[j]);
        }
        double perc_95 = stats.getPercentile(95);
        double perc_5 = stats.getPercentile(5);
        double perc_50 = stats.getPercentile(50);
                
        if (sinus[i-1]<perc_95 && sinus[i]>=perc_95) sm.applyEvent(new Event("Buy"));
        if (sinus[i-1]>perc_5 && sinus[i]<=perc_5) sm.applyEvent(new Event("Sell"));
                
                
        // TODO: Add liquidation events            
                                
           }
                   
        }
        */

        // Terminate FSM
        strategyFSM.stop();
    } catch (FiniteStateException e) {
        logger.error("Unexpected state transition processing error", e);
    } catch (Exception e) {
        System.err.println(e.getMessage());
        e.printStackTrace();
    }
}

---

From source file:Rotate.java

public void paint(Graphics g) {
    super.paint(g);
    Graphics2D g2d = (Graphics2D) g;
    g2d.setColor(new Color(150, 150, 150));
    g2d.fillRect(20, 20, 80, 50);/*w w  w .ja  v a 2s  . c  o m*/
    g2d.translate(180, -150);
    g2d.rotate(Math.PI / 4);
    g2d.fillRect(20, 20, 80, 50);
}

---

From source file:MainClass.java

public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;

    int w = getSize().width - 1;
    int h = getSize().height - 1;

    for (int i = 0; i < 12; i++) {
        double angle = Math.PI / 2 - i * Math.PI / 6;
        double x = Math.cos(angle);
        double y = Math.sin(angle);

        Line2D l = new Line2D.Double(100 + 55.0 * x, 100 - 55.0 * y, 100 + 65.0 * x, 100 - 65.0 * y);

        g2.draw(l);/*w w w.ja v a  2s  . c  o  m*/
    }
}

---

From source file:edu.gmu.cs.sim.util.media.chart.ScatterPlotSeriesAttributes.java

static Shape[] buildShapes() {
    Shape[] s = new Shape[7];
    GeneralPath g = null;//from   w  ww.  j  a  va 2s .co m

    // Circle
    s[0] = new Ellipse2D.Double(-3, -3, 6, 6);

    // Rectangle
    Rectangle2D.Double r = new Rectangle2D.Double(-3, -3, 6, 6);
    s[1] = r;

    // Diamond
    s[2] = AffineTransform.getRotateInstance(Math.PI / 4.0).createTransformedShape(r);

    // Cross +
    g = new GeneralPath();
    g.moveTo(-0.5f, -3);
    g.lineTo(-0.5f, -0.5f);
    g.lineTo(-3, -0.5f);
    g.lineTo(-3, 0.5f);
    g.lineTo(-0.5f, 0.5f);
    g.lineTo(-0.5f, 3);
    g.lineTo(0.5f, 3);
    g.lineTo(0.5f, 0.5f);
    g.lineTo(3, 0.5f);
    g.lineTo(3, -0.5f);
    g.lineTo(0.5f, -0.5f);
    g.lineTo(0.5f, -3);
    g.closePath();
    s[3] = g;

    // X 
    s[4] = g.createTransformedShape(AffineTransform.getRotateInstance(Math.PI / 4.0));

    // Up Triangle
    g = new GeneralPath();
    g.moveTo(0f, -3);
    g.lineTo(-3, 3);
    g.lineTo(3, 3);
    g.closePath();
    s[5] = g;

    // Down Triangle
    s[6] = g.createTransformedShape(AffineTransform.getRotateInstance(Math.PI));

    return s;
}

---

From source file:Main.java

public void paint(Graphics g) {
    g.fillRect(0, 0, 20, 20);// w  w  w . j a v  a  2 s. co  m

    Graphics2D g2 = (Graphics2D) g;

    g2.shear(5.3, 5.4);
    g2.rotate(30.0 * Math.PI / 180.0);

    g2.scale(2.0, 2.0);

    g.setColor(Color.red);

    g.fillRect(0, 0, 20, 20);
}

---

From source file:Main.java

public void paint(Graphics g) {
    g.fillRect(0, 0, 20, 20);/* w  ww.j  a v a  2  s .c  o  m*/

    Graphics2D g2 = (Graphics2D) g;

    g2.translate(50, 50);
    g2.rotate(30.0 * Math.PI / 180.0);

    g2.scale(2.0, 2.0);

    g.setColor(Color.red);

    g.fillRect(0, 0, 20, 20);
}

---

From source file:Main.java

public void paint(Graphics g) {
    g.fillRect(0, 0, 20, 20);/*from w  ww . ja  v a2  s  .c o m*/

    Graphics2D g2 = (Graphics2D) g;

    g2.translate(5.3, 5.4);
    g2.rotate(30.0 * Math.PI / 180.0);

    g2.scale(2.0, 2.0);

    g.setColor(Color.red);

    g.fillRect(0, 0, 20, 20);
}

---

From source file:Main.java

public void paint(Graphics g) {
    super.paintComponent(g);
    int radius = 40;
    int centerX = 50;
    int centerY = 100;

    Polygon p = new Polygon();
    centerX = 150;// w  w  w.j ava  2s .c o  m
    for (int i = 0; i < 5; i++)
        p.addPoint((int) (centerX + radius * Math.cos(i * 2 * Math.PI / 5)),
                (int) (centerY + radius * Math.sin(i * 2 * Math.PI / 5)));

    g.fillPolygon(p);

}

---

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