org.jpedal.function.PDFGenericFunction Maven / Gradle / Ivy
The newest version!
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/java-pdf-library-support/
*
* (C) Copyright 1997-2013, IDRsolutions and Contributors.
*
* This file is part of JPedal
*
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
*
* ---------------
* PDFGenericFunction.java
* ---------------
*/
package org.jpedal.function;
import java.io.Serializable;
/**
* Contains code which are used by multiple Shading Classes
*/
public class PDFGenericFunction implements Serializable {
private static final long serialVersionUID = 2585493215543078599L;
/**
* values found in Function using names used in PDF reference
*/
protected float[] domain, encode, decode, range;
public PDFGenericFunction(float[] domain, float[] range) {
this.range = range;
this.domain = domain;
}
/**
* Preform interpolation on the given values.
*
* @param x
* : current X value
* @param xmin
* : lowest x value
* @param xmax
* : highest x value
* @param ymin
* : lowest y value
* @param ymax
* : highest y value
* @return y value for the x value
*/
static float interpolate(float x, float xmin, float xmax, float ymin, float ymax) {
return ((x - xmin) * (ymax - ymin) / (xmax - xmin)) + ymin;
}
/**
* Return the lowest of the input vairbles
*
* @param a
* : value 1 to check
* @param b
* : value 2 to check
* @return The lowest of the input values
*/
static float min(float a, float b) {
if (a > b) return b;
else return a;
}
/**
* Return the highest of the input vairbles
*
* @param a
* : value 1 to check
* @param b
* : value 2 to check
* @return The highest of the input values
*/
static float max(float a, float b) {
if (a < b) return b;
else return a;
}
}