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/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2020, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
*/
package org.jfree.chart.ui;
import java.awt.GradientPaint;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import org.jfree.chart.util.PublicCloneable;
/**
* Transforms a {@code GradientPaint} to range over the width of a target
* shape. Instances of this class are immutable.
*/
public class StandardGradientPaintTransformer
implements GradientPaintTransformer, Cloneable, PublicCloneable,
Serializable {
/** For serialization. */
private static final long serialVersionUID = -8155025776964678320L;
/** The transform type. */
private GradientPaintTransformType type;
/**
* Creates a new transformer with the type
* {@link GradientPaintTransformType#VERTICAL}.
*/
public StandardGradientPaintTransformer() {
this(GradientPaintTransformType.VERTICAL);
}
/**
* Creates a new transformer with the specified type.
*
* @param type the transform type ({@code null} not permitted).
*/
public StandardGradientPaintTransformer(
final GradientPaintTransformType type) {
if (type == null) {
throw new IllegalArgumentException("Null 'type' argument.");
}
this.type = type;
}
/**
* Returns the type of transform.
*
* @return The type of transform (never {@code null}).
*
* @since 1.0.10
*/
public GradientPaintTransformType getType() {
return this.type;
}
/**
* Transforms a {@code GradientPaint} instance to fit the specified
* {@code target} shape.
*
* @param paint the original paint ({@code null} not permitted).
* @param target the target shape ({@code null} not permitted).
*
* @return The transformed paint.
*/
@Override
public GradientPaint transform(GradientPaint paint, Shape target) {
GradientPaint result = paint;
Rectangle2D bounds = target.getBounds2D();
if (this.type.equals(GradientPaintTransformType.VERTICAL)) {
result = new GradientPaint((float) bounds.getCenterX(),
(float) bounds.getMinY(), paint.getColor1(),
(float) bounds.getCenterX(), (float) bounds.getMaxY(),
paint.getColor2());
}
else if (this.type.equals(GradientPaintTransformType.HORIZONTAL)) {
result = new GradientPaint((float) bounds.getMinX(),
(float) bounds.getCenterY(), paint.getColor1(),
(float) bounds.getMaxX(), (float) bounds.getCenterY(),
paint.getColor2());
}
else if (this.type.equals(
GradientPaintTransformType.CENTER_HORIZONTAL)) {
result = new GradientPaint((float) bounds.getCenterX(),
(float) bounds.getCenterY(), paint.getColor2(),
(float) bounds.getMaxX(), (float) bounds.getCenterY(),
paint.getColor1(), true);
}
else if (this.type.equals(GradientPaintTransformType.CENTER_VERTICAL)) {
result = new GradientPaint((float) bounds.getCenterX(),
(float) bounds.getMinY(), paint.getColor1(),
(float) bounds.getCenterX(), (float) bounds.getCenterY(),
paint.getColor2(), true);
}
return result;
}
/**
* Tests this instance for equality with an arbitrary object.
*
* @param obj the object ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof StandardGradientPaintTransformer)) {
return false;
}
StandardGradientPaintTransformer that
= (StandardGradientPaintTransformer) obj;
if (this.type != that.type) {
return false;
}
return true;
}
/**
* Returns a clone of the transformer. Note that instances of this class
* are immutable, so cloning an instance isn't really necessary.
*
* @return A clone.
*
* @throws CloneNotSupportedException not thrown by this class, but
* subclasses (if any) might.
*/
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/**
* Returns a hash code for this object.
*
* @return A hash code.
*/
@Override
public int hashCode() {
return (this.type != null ? this.type.hashCode() : 0);
}
}