org.jpedal.utils.DPIFactory Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
An Open Source JavaFX PDF Viewer
The newest version!
/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2015 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
     This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 *
 * ---------------
 * DPIFactory.java
 * ---------------
 */
package org.jpedal.utils;

public class DPIFactory {
	
	//Current DPI value, Java is 72 by default
	private float dpi = 72f;

	/**
	 * Corrects the image scaling to take into account the user specified DPI value
	 * @param scaling :: Raw scaling value before DPI is applied (DPI of 72 is default)
	 * @return Corrected scaling in the form of a float
	 */
    public float adjustScaling(final float scaling) {
    		return scaling * (dpi/72f);
    }
    
    /**
	 * Corrects the image scaling to take into account the user specified DPI value
	 * @param scaling :: Raw scaling value before DPI is applied (DPI of 72 is default)
	 * @return Corrected scaling in the form of a float
	 */
    public float removeScaling(final float scaling) {
    		return scaling / (dpi/72f);
    }
    
    /**
     * Get the current value of the user defined DPI (default = 72)
     * @return :: The current DPI value as a float
     */
	public float getDpi() {
		return dpi;
	}

	/**
	 * Sets the current DPI to the input value dpi
	 * @param dpi :: The new dpi value expressed as a float
	 */
	public void setDpi(final float dpi) {
		this.dpi = dpi;
	}
}