Example usage for java.lang Math round

List of usage examples for java.lang Math round

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Introduction

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

Prototype

public static long round(double a)

Source Link

Document

Returns the closest long to the argument, with ties rounding to positive infinity.

Usage

From source file:Util.java

/**
 * Returns closest point on segment to point
 * /*  w w w  .j a  va  2s  .c o m*/
 * @param sx1
 *            segment x coord 1
 * @param sy1
 *            segment y coord 1
 * @param sx2
 *            segment x coord 2
 * @param sy2
 *            segment y coord 2
 * @param px
 *            point x coord
 * @param py
 *            point y coord
 * @return closets point on segment to point
 */
public static Point getClosestPointOnSegment(int sx1, int sy1, int sx2, int sy2, int px, int py) {
    double xDelta = sx2 - sx1;
    double yDelta = sy2 - sy1;

    if ((xDelta == 0) && (yDelta == 0)) {
        throw new IllegalArgumentException("Segment start equals segment end");
    }

    double u = ((px - sx1) * xDelta + (py - sy1) * yDelta) / (xDelta * xDelta + yDelta * yDelta);

    final Point closestPoint;
    if (u < 0) {
        closestPoint = new Point(sx1, sy1);
    } else if (u > 1) {
        closestPoint = new Point(sx2, sy2);
    } else {
        closestPoint = new Point((int) Math.round(sx1 + u * xDelta), (int) Math.round(sy1 + u * yDelta));
    }

    return closestPoint;
}

From source file:Main.java

/**
 * Convert HSL (hue-saturation-lightness) components to a RGB color.
 * <ul>//www. ja v a 2 s.c o m
 * <li>hsl[0] is Hue [0 .. 360)</li>
 * <li>hsl[1] is Saturation [0...1]</li>
 * <li>hsl[2] is Lightness [0...1]</li>
 * </ul>
 * If hsv values are out of range, they are pinned.
 *
 * @param hsl 3 element array which holds the input HSL components.
 * @return the resulting RGB color
 */
public static int HSLToColor(float[] hsl) {
    final float h = hsl[0];
    final float s = hsl[1];
    final float l = hsl[2];

    final float c = (1f - Math.abs(2 * l - 1f)) * s;
    final float m = l - 0.5f * c;
    final float x = c * (1f - Math.abs((h / 60f % 2f) - 1f));

    final int hueSegment = (int) h / 60;

    int r = 0, g = 0, b = 0;

    switch (hueSegment) {
    case 0:
        r = Math.round(255 * (c + m));
        g = Math.round(255 * (x + m));
        b = Math.round(255 * m);
        break;
    case 1:
        r = Math.round(255 * (x + m));
        g = Math.round(255 * (c + m));
        b = Math.round(255 * m);
        break;
    case 2:
        r = Math.round(255 * m);
        g = Math.round(255 * (c + m));
        b = Math.round(255 * (x + m));
        break;
    case 3:
        r = Math.round(255 * m);
        g = Math.round(255 * (x + m));
        b = Math.round(255 * (c + m));
        break;
    case 4:
        r = Math.round(255 * (x + m));
        g = Math.round(255 * m);
        b = Math.round(255 * (c + m));
        break;
    case 5:
    case 6:
        r = Math.round(255 * (c + m));
        g = Math.round(255 * m);
        b = Math.round(255 * (x + m));
        break;
    }

    r = Math.max(0, Math.min(255, r));
    g = Math.max(0, Math.min(255, g));
    b = Math.max(0, Math.min(255, b));

    return Color.rgb(r, g, b);
}

From source file:Main.java

public static Point libgdxToScreenCoordinates(Context context, float x, float y) {
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    Display display = wm.getDefaultDisplay();
    Point size = new Point();
    display.getSize(size);/*from  w  ww . j  a  v a2  s .co  m*/
    //      Log.d(CucumberInstrumentation.TAG, String.format("center: [%d/%d]", size.x / 2, size.y / 2));
    Point point = new Point();
    point.x = Math.round((size.x / 2f) + x);
    point.y = Math.round((size.y / 2f) + y);
    //      Log.d(CucumberInstrumentation.TAG, String.format("coords: [%d/%d]", point.x, point.y));
    return point;
}

From source file:Main.java

/**
 * Convert HSL (hue-saturation-lightness) components to a RGB color.
 * <ul>/*from   ww w.ja va2s. c  om*/
 * <li>hsl[0] is Hue [0 .. 360)</li>
 * <li>hsl[1] is Saturation [0...1]</li>
 * <li>hsl[2] is Lightness [0...1]</li>
 * </ul>
 * If hsv values are out of range, they are pinned.
 *
 * @param hsl 3-element array which holds the input HSL components
 * @return the resulting RGB color
 */
public static int HSLToColor(float[] hsl) {
    final float h = hsl[0];
    final float s = hsl[1];
    final float l = hsl[2];

    final float c = (1f - Math.abs(2 * l - 1f)) * s;
    final float m = l - 0.5f * c;
    final float x = c * (1f - Math.abs((h / 60f % 2f) - 1f));

    final int hueSegment = (int) h / 60;

    int r = 0, g = 0, b = 0;

    switch (hueSegment) {
    case 0:
        r = Math.round(255 * (c + m));
        g = Math.round(255 * (x + m));
        b = Math.round(255 * m);
        break;
    case 1:
        r = Math.round(255 * (x + m));
        g = Math.round(255 * (c + m));
        b = Math.round(255 * m);
        break;
    case 2:
        r = Math.round(255 * m);
        g = Math.round(255 * (c + m));
        b = Math.round(255 * (x + m));
        break;
    case 3:
        r = Math.round(255 * m);
        g = Math.round(255 * (x + m));
        b = Math.round(255 * (c + m));
        break;
    case 4:
        r = Math.round(255 * (x + m));
        g = Math.round(255 * m);
        b = Math.round(255 * (c + m));
        break;
    case 5:
    case 6:
        r = Math.round(255 * (c + m));
        g = Math.round(255 * m);
        b = Math.round(255 * (x + m));
        break;
    }

    r = constrain(r, 0, 255);
    g = constrain(g, 0, 255);
    b = constrain(b, 0, 255);

    return Color.rgb(r, g, b);
}

From source file:Main.java

private static int getTextWidth(@Nullable final CharSequence text, final TextPaint paint) {
    if (TextUtils.isEmpty(text)) {
        return 0;
    }//from www. java2  s. c  o m
    final int length = text.length();
    final float[] widths = new float[length];
    final int count;
    final Typeface savedTypeface = paint.getTypeface();
    try {
        paint.setTypeface(getTextTypeface(text));
        count = paint.getTextWidths(text, 0, length, widths);
    } finally {
        paint.setTypeface(savedTypeface);
    }
    int width = 0;
    for (int i = 0; i < count; i++) {
        width += Math.round(widths[i] + 0.5f);
    }
    return width;
}

From source file:Main.java

public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;
    if (height > reqHeight || width > reqWidth) {
        final int heightRatio = Math.round((float) height / (float) reqHeight);
        final int widthRatio = Math.round((float) width / (float) reqWidth);
        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }//from  www.  j  a v  a 2  s.  co  m
    return inSampleSize;
}

From source file:Main.java

private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        // Calculate ratios of height and width to requested height and
        // width/*from   w  w w.  ja v a 2 s.com*/
        final int heightRatio = Math.round((float) height / (float) reqHeight);
        final int widthRatio = Math.round((float) width / (float) reqWidth);

        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }

    return inSampleSize;
}

From source file:Main.java

/**
 * Convert XYZ to RGB.//from   w  w  w. j  av a  2  s .  c  o m
 *
 * Convert equation and source code is from ImageJ's plugin Color Space Converter
 * http://rsbweb.nih.gov/ij/plugins/download/Color_Space_Converter.java
 * 
 * @param X
 * @param Y
 * @param Z
 * @return RGB in int array.
 */
private static int[] XYZtoRGB(double X, double Y, double Z) {
    int[] result = new int[3];

    double x = X / 100.0;
    double y = Y / 100.0;
    double z = Z / 100.0;

    // [r g b] = [X Y Z][Mi]
    double r = (x * Mi[0][0]) + (y * Mi[0][1]) + (z * Mi[0][2]);
    double g = (x * Mi[1][0]) + (y * Mi[1][1]) + (z * Mi[1][2]);
    double b = (x * Mi[2][0]) + (y * Mi[2][1]) + (z * Mi[2][2]);

    // assume sRGB
    if (r > 0.0031308) {
        r = ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055);
    } else {
        r = (r * 12.92);
    }

    if (g > 0.0031308) {
        g = ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055);
    } else {
        g = (g * 12.92);
    }

    if (b > 0.0031308) {
        b = ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055);
    } else {
        b = (b * 12.92);
    }

    r = (r < 0) ? 0 : r;
    g = (g < 0) ? 0 : g;
    b = (b < 0) ? 0 : b;

    // convert 0..1 into 0..255
    result[0] = (int) Math.round(r * 255);
    result[1] = (int) Math.round(g * 255);
    result[2] = (int) Math.round(b * 255);

    return result;
}

From source file:Main.java

public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {
        if (width > height) {
            inSampleSize = Math.round((float) height / (float) reqHeight);
        } else {/*from   w ww . j  a  va2 s. c o  m*/
            inSampleSize = Math.round((float) width / (float) reqWidth);
        }
    }
    return inSampleSize;
}

From source file:de.tudarmstadt.ukp.wikipedia.util.ApiUtilities.java

/**
 * Prints a progress counter.//from ww w.j  av  a2  s.com
 * @param counter Indicates the position in the task.
 * @param size Size of the overall task.
 * @param step How many parts should the progress counter have?
 * @param mode Sets the output mode.
 * @param text The text that should be print along with the progress indicator.
 */
public static void printProgressInfo(int counter, int size, int step, ProgressInfoMode mode, String text) {
    if (size < step) {
        return;
    }

    if (counter % (size / step) == 0) {
        double progressPercent = counter * 100 / size;
        progressPercent = 1 + Math.round(progressPercent * 100) / 100.0;
        if (mode.equals(ApiUtilities.ProgressInfoMode.TEXT)) {
            logger.info(text + ": " + progressPercent + " - " + OS.getUsedMemory() + " MB");
        } else if (mode.equals(ApiUtilities.ProgressInfoMode.DOTS)) {
            System.out.print(".");
            if (progressPercent >= 100) {
                System.out.println();
            }
        }
    }
}