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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 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
*
* ---------------
* PDFGenericFunction.java
* ---------------
*/
package org.jpedal.function;
import java.io.Serializable;
/**
* Contains code which are used by multiple Shading Classes
*/
public class PDFGenericFunction implements Serializable {
/**
* values found in Function using names used in PDF reference
*/
protected final float[] domain;
protected float[] encode;
protected float[] decode;
protected final float[] range;
public PDFGenericFunction(final float[] domain, final 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(final float x, final float xmin, final float xmax, final float ymin, final 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(final float a, final 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(final float a, final float b) {
if(a