org.jpedal.function.PDFGenericFunction Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
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
*
* ---------------
* 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