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:fungus.VisualizerTransformers.java

public static Shape createRegularPolygon(int sides, int radius) {
    Polygon p = new Polygon();
    double a = 2 * Math.PI / sides;
    for (int i = 0; i < sides; i++)
        p.addPoint((int) (radius * Math.sin(a * i)), (int) (radius * -Math.cos(a * i)));
    return p;/*from  w  w  w .  ja va  2 s  .c  om*/
}

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From source file:com.opengamma.analytics.math.function.special.GammaFunction.java

@Override
public Double evaluate(final Double x) {
    if (x > 0.0) {
        return Math.exp(Gamma.logGamma(x));
    }/*from  ww  w  .j  ava  2s.co  m*/
    return Math.PI / Math.sin(Math.PI * x) / evaluate(1 - x);
}

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From source file:com.opengamma.strata.math.impl.function.special.GammaFunction.java

@Override
public double applyAsDouble(double x) {
    if (x > 0.0) {
        return Math.exp(Gamma.logGamma(x));
    }/*from   ww  w .  j  a v  a 2s.co m*/
    return Math.PI / Math.sin(Math.PI * x) / applyAsDouble(1 - x);
}

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From source file:edu.columbia.sel.grout.util.TileUtils.java

/**
 * For a description see:// w ww . ja  va  2s.c  o  m
 * 
 * @see http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames For a
 *      code-description see:
 * @see http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames#
 *      compute_bounding_box_for_tile_number
 * @param aLat
 *            latitude to get the {@link OSMTileInfo} for.
 * @param aLon
 *            longitude to get the {@link OSMTileInfo} for.
 * @return The {@link OSMTileInfo} providing 'x' 'y' and 'z'(oom) for the
 *         coordinates passed.
 */
public static OSMTileInfo getMapTileFromCoordinates(final double aLat, final double aLon, final int zoom) {
    final int y = (int) Math
            .floor((1 - Math.log(Math.tan(aLat * Math.PI / 180) + 1 / Math.cos(aLat * Math.PI / 180)) / Math.PI)
                    / 2 * (1 << zoom));
    final int x = (int) Math.floor((aLon + 180) / 360 * (1 << zoom));

    return new OSMTileInfo(x, y, zoom);
}

---

From source file:Utils.java

public static Shape generatePolygon(int sides, int outsideRadius, int insideRadius) {

    if (sides < 3) {
        return new Ellipse2D.Float(0, 0, 10, 10);
    }/*from w  w  w .  ja  va  2  s  . c om*/

    AffineTransform trans = new AffineTransform();
    Polygon poly = new Polygon();
    for (int i = 0; i < sides; i++) {
        trans.rotate(Math.PI * 2 / (float) sides / 2);
        Point2D out = trans.transform(new Point2D.Float(0, outsideRadius), null);
        poly.addPoint((int) out.getX(), (int) out.getY());
        trans.rotate(Math.PI * 2 / (float) sides / 2);
        if (insideRadius > 0) {
            Point2D in = trans.transform(new Point2D.Float(0, insideRadius), null);
            poly.addPoint((int) in.getX(), (int) in.getY());
        }
    }

    return poly;
}

---

From source file:Main.java

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

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    int cx = getSize().width / 2;
    int cy = getSize().height / 2;

    g2.translate(cx, cy);/*from www . ja  v a  2s.c o m*/
    g2.rotate(theta * Math.PI / 180);

    Shape oldClip = g2.getClip();
    Shape e = new Ellipse2D.Float(-cx, -cy, cx * 2, cy * 2);
    g2.clip(e);

    Shape c = new Ellipse2D.Float(-cx, -cy, cx * 3 / 4, cy * 2);
    g2.setPaint(new GradientPaint(40, 40, Color.blue, 60, 50, Color.white, true));
    g2.fill(c);

    g2.setPaint(Color.yellow);
    g2.fillOval(cx / 4, 0, cx, cy);

    g2.setClip(oldClip);

    g2.setFont(new Font("Times New Roman", Font.PLAIN, 64));
    g2.setPaint(new GradientPaint(-cx, 0, Color.red, cx, 0, Color.black, false));
    g2.drawString("Hello, 2D!", -cx * 3 / 4, cy / 4);

    AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float) .75);
    g2.setComposite(ac);

    Shape r = new RoundRectangle2D.Float(0, -cy * 3 / 4, cx * 3 / 4, cy * 3 / 4, 20, 20);
    g2.setStroke(new BasicStroke(4));
    g2.setPaint(Color.magenta);
    g2.fill(r);
    g2.setPaint(Color.green);
    g2.draw(r);

    g2.drawImage(image, -cx / 2, -cy / 2, this);
}

---

From source file:com.opengamma.analytics.math.function.special.OrthonormalHermitePolynomialFunctionTest.java

@Test
public void test() {
    final int n = 15;
    final DoubleFunction1D[] f1 = HERMITE.getPolynomials(n);
    final DoubleFunction1D[] f2 = ORTHONORMAL.getPolynomials(n);
    final double x = 3.4;
    for (int i = 0; i < f1.length; i++) {
        assertEquals(//from   w w  w . j a va 2  s  .  c  om
                f1[i].evaluate(x)
                        / Math.sqrt(MathUtils.factorialDouble(i) * Math.pow(2, i) * Math.sqrt(Math.PI)),
                f2[i].evaluate(x), EPS);
    }
}

---

From source file:Main.java

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

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    String s = "www.java2s.com www.java2s.com";
    Font font = new Font("Serif", Font.PLAIN, 24);
    FontRenderContext frc = g2.getFontRenderContext();
    g2.translate(40, 80);//w w  w .ja va 2  s .co m

    GlyphVector gv = font.createGlyphVector(frc, s);
    int length = gv.getNumGlyphs();
    for (int i = 0; i < length; i++) {
        Point2D p = gv.getGlyphPosition(i);
        double theta = (double) i / (double) (length - 1) * Math.PI / 4;
        AffineTransform at = AffineTransform.getTranslateInstance(p.getX(), p.getY());
        at.rotate(theta);
        Shape glyph = gv.getGlyphOutline(i);
        Shape transformedGlyph = at.createTransformedShape(glyph);
        g2.fill(transformedGlyph);
    }
}

---

From source file:Main.java

protected void paintComponent(Graphics g) {
    super.paintComponent(g);

    g.drawLine(10, 100, 380, 100);//from   ww w.  jav a 2  s .  c  om
    g.drawLine(200, 30, 200, 190);

    g.drawLine(380, 100, 370, 90);
    g.drawLine(380, 100, 370, 110);
    g.drawLine(200, 30, 190, 40);
    g.drawLine(200, 30, 210, 40);

    g.drawString("X", 360, 80);
    g.drawString("Y", 220, 40);

    Polygon p = new Polygon();
    Polygon p2 = new Polygon();

    for (int x = -170; x <= 170; x++) {
        p.addPoint(x + 200, 100 - (int) (50 * f((x / 100.0) * 2 * Math.PI)));

    }

    for (int x = -170; x <= 170; x++) {
        p2.addPoint(x + 200, 100 - (int) (50 * gCos((x / 100.0) * 2 * Math.PI)));

    }

    g.setColor(Color.red);
    g.drawPolyline(p.xpoints, p.ypoints, p.npoints);
    g.drawString("-2\u03c0", 95, 115);
    g.drawString("-\u03c0", 147, 115);
    g.drawString("\u03c0", 253, 115);
    g.drawString("2\u03c0", 305, 115);
    g.drawString("0", 200, 115);

    g.setColor(Color.blue);
    g.drawPolyline(p2.xpoints, p2.ypoints, p2.npoints);

}

---

From source file:Main.java

/**
 * <p>This function converts decimal degrees to radians.</p>
 *
 * @param deg - the decimal to convert to radians
 * @return the decimal converted to radians
 *//*from w  w  w  .jav  a2  s  .c o  m*/
private static final double deg2rad(double deg) {
    return (deg * Math.PI / 180.0);
}

---

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