org.jpedal.function.PDFGenericFunction Maven / Gradle / Ivy
/*
* ===========================================
* 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
*
@LICENSE@
*
* ---------------
* 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 < b) {
return b;
} else {
return a;
}
}
}