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:com.opengamma.strata.math.impl.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. co  m*/
                f1[i].applyAsDouble(x) / Math
                        .sqrt(CombinatoricsUtils.factorialDouble(i) * Math.pow(2, i) * Math.sqrt(Math.PI)),
                f2[i].applyAsDouble(x), EPS);
    }
}

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From source file:Main.java

/**
 * Given two angles in degrees, determine the smallest angle between them.
 *
 * For example, given angles 90 and 170, the smallest angle difference would be 80
 * and the larger angle difference would be 280.
 *
 * @param firstAngleDeg/*from   w  w  w .  ja va2  s .  c  om*/
 * @param secondAngleDeg
 * @return smallest angle
 */
public static double smallestAngularDifferenceDegrees(double firstAngleDeg, double secondAngleDeg) {
    double rawDiffDeg = firstAngleDeg - secondAngleDeg;
    double rawDiffRad = rawDiffDeg * Math.PI / 180;
    double wrappedDiffRad = Math.atan2(Math.sin(rawDiffRad), Math.cos(rawDiffRad));
    double wrappedDiffDeg = wrappedDiffRad * 180 / Math.PI;

    return wrappedDiffDeg;
}

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From source file:com.cloudmade.api.Utils.java

/**
 * Convert latitude, longitude pair to tile coordinates
 * //from www  .  j  a va2  s  . co m
 * @param latitude
 * @param longitude
 * @param zoom
 * @return Tile coordinates [x, y]
 */
public static final int[] latlon2tilenums(double latitude, double longitude, int zoom) {
    int factor = 1 << (zoom - 1);
    latitude = Math.toRadians(latitude);
    longitude = Math.toRadians(longitude);
    double xtile = 1 + longitude / Math.PI;
    double ytile = 1 - Math.log(Math.tan(latitude) + (1 / Math.cos(latitude))) / Math.PI;
    return new int[] { (int) (xtile * factor), (int) (ytile * factor) };
}

---

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);//from  w  w w .  j  av a  2  s.c  o m

    GlyphVector gv = font.createGlyphVector(frc, s);
    System.out.println(gv.getFont());

    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

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);//from   w w w .  ja v  a2s  .  c om

    GlyphVector gv = font.createGlyphVector(frc, s);
    System.out.println(gv.getOutline());

    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

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);/*from w  w  w  .  j  a  va 2  s .com*/

    GlyphVector gv = font.createGlyphVector(frc, s);
    System.out.println(gv.getVisualBounds());

    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

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);//from   w  w  w  . ja  v  a2 s.  c  o m

    GlyphVector gv = font.createGlyphVector(frc, s);
    System.out.println(gv.getLogicalBounds());

    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:com.insightml.math.distributions.GaussianDistribution.java

public GaussianDistribution(final double mean, final double stddev) {
    this.mean = mean;
    this.stddev = stddev;

    sigmaSquare = stddev * stddev;/*w  w  w  . j a va2 s.  c om*/
    factor = 1. / Math.sqrt(2 * Math.PI * sigmaSquare);
}

---

From source file:com.atomiton.watermanagement.ngo.util.WaterMgmtNGOUtility.java

public static double deg2rad(double deg) {
    return deg * (Math.PI / 180);
}

---

From source file:Main.java

private static BufferedImage createRotatedImage(Object src, int width, int height, int angle) {
    angle = angle % 360;/*from www.  j a  va 2 s . c o m*/

    if (angle < 0) {
        angle += 360;
    }

    if (angle == 0) {
        return renderRotatedObject(src, 0, width, height, 0, 0);
    } else if (angle == 90) {
        return renderRotatedObject(src, -Math.PI / 2, height, width, -width, 0);
    } else if (angle == 180) {
        return renderRotatedObject(src, Math.PI, width, height, -width, -height);
    } else if (angle == 270) {
        return renderRotatedObject(src, Math.PI / 2, height, width, 0, -height);
    } else if (angle > 0 && angle < 90) {
        double angleInRadians = ((-angle * Math.PI) / 180.0);
        double cosTheta = Math.abs(Math.cos(angleInRadians));
        double sineTheta = Math.abs(Math.sin(angleInRadians));

        int dW = (int) (width * cosTheta + height * sineTheta);
        int dH = (int) (width * sineTheta + height * cosTheta);

        return renderRotatedObject(src, angleInRadians, dW, dH, -width * sineTheta * sineTheta,
                width * sineTheta * cosTheta);

    } else if (angle > 90 && angle < 180) {
        double angleInRadians = ((-angle * Math.PI) / 180.0);
        double cosTheta = Math.abs(Math.cos(angleInRadians));
        double sineTheta = Math.abs(Math.sin(angleInRadians));

        int dW = (int) (width * cosTheta + height * sineTheta);
        int dH = (int) (width * sineTheta + height * cosTheta);

        return renderRotatedObject(src, angleInRadians, dW, dH, -(width + height * sineTheta * cosTheta),
                -height / 2);

    } else if (angle > 180 && angle < 270) {
        double angleInRadians = ((-angle * Math.PI) / 180.0);
        double cosTheta = Math.abs(Math.cos(angleInRadians));
        double sineTheta = Math.abs(Math.sin(angleInRadians));

        int dW = (int) (width * cosTheta + height * sineTheta);
        int dH = (int) (width * sineTheta + height * cosTheta);

        return renderRotatedObject(src, angleInRadians, dW, dH, -(width * cosTheta * cosTheta),
                -(height + width * cosTheta * sineTheta));

    } else if (angle > 270 && angle < 360) {
        double angleInRadians = ((-angle * Math.PI) / 180.0);
        double cosTheta = Math.abs(Math.cos(angleInRadians));
        double sineTheta = Math.abs(Math.sin(angleInRadians));

        int dW = (int) (width * cosTheta + height * sineTheta);
        int dH = (int) (width * sineTheta + height * cosTheta);

        return renderRotatedObject(src, angleInRadians, dW, dH, (height * cosTheta * sineTheta),
                -(height * sineTheta * sineTheta));

    }

    return renderRotatedObject(src, 0, width, height, 0, 0);
}

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