Pixels.java

package edu.stanford.hci.r3.units;

import edu.stanford.hci.r3.config.Configuration;

public class Pixels extends Units {

        public static final String CONFIG_FILE_KEY = "pixels.pixelsperinch.file";

        public static final String CONFIG_FILE_VALUE = "/config/PixelsPerInch.xml";

        private static final double DEFAULT_PIXELS_PER_INCH = readPixelsPerInchFromConfigFile();

        public static final Pixels ONE = new Pixels(1);

        private static final String PROPERTY_NAME = "pixelsPerInch";

        public static Pixels getPixelsPerInchObject(int ppi) {
                return new Pixels(1, ppi);
        }

        private static double readPixelsPerInchFromConfigFile() {
                final String property = Configuration.getPropertyFromConfigFile(PROPERTY_NAME,
                                CONFIG_FILE_KEY);
                final double ppi = Double.parseDouble(property);
                return ppi;
        }

        private double pixelsPerInch = DEFAULT_PIXELS_PER_INCH;

        public Pixels() {
                super(1);
        }

        public Pixels(double numPixels) {
                super(numPixels);
        }

        public Pixels(double numPixels, double pixPerInch) {
                super(numPixels);
                pixelsPerInch = pixPerInch;
        }

        @Override
        protected double getNumberOfUnitsInOneInch() {
                return pixelsPerInch;
        }

        public double getPixelsPerInch() {
                return pixelsPerInch;
        }
}

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