/**
* GradientLookup.java
*
* Copyright (c) 2011-2014, JFXtras
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the organization nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package jfxtras.labs.scene.control.gauge;
import java.util.Map;
import java.util.TreeMap;
import javafx.scene.paint.Color;
import javafx.scene.paint.Stop;
/**
* Created by
* User: hansolo
* Date: 21.03.12
* Time: 09:14
*/
public class GradientLookup {
private Map<Double, Stop> stops;
// ******************** Constructors **************************************
public GradientLookup(final Stop... STOPS) {
stops = new TreeMap<Double, Stop>();
for (Stop stop : STOPS) {
stops.put(stop.getOffset(), stop);
}
init();
}
// ******************** Initialization ************************************
private void init() {
double minFraction = 1;
double maxFraction = 0;
for (Double fraction : stops.keySet()) {
minFraction = Math.min(fraction, minFraction);
maxFraction = Math.max(fraction, maxFraction);
}
if (minFraction > 0) {
stops.put(0.0, new Stop(0.0, stops.get(minFraction).getColor()));
}
if (maxFraction < 1){
stops.put(1.0, new Stop(1.0, stops.get(maxFraction).getColor()));
}
}
// ******************** Methods *******************************************
public Color getColorAt(final double POSITION_OF_COLOR) {
final double POSITION = POSITION_OF_COLOR < 0 ? 0 : (POSITION_OF_COLOR > 1 ? 1 : POSITION_OF_COLOR);
final Color COLOR;
if (stops.size() == 1) {
final Map<Double, Color> ONE_ENTRY = (Map<Double, Color>) stops.entrySet().iterator().next();
COLOR = stops.get(ONE_ENTRY.keySet().iterator().next()).getColor();
} else {
Stop lowerBound = stops.get(0.0);
Stop upperBound = stops.get(1.0);
for (Double fraction : stops.keySet()) {
if (Double.compare(fraction,POSITION) < 0) {
lowerBound = stops.get(fraction);
}
if (Double.compare(fraction, POSITION) > 0) {
upperBound = stops.get(fraction);
break;
}
}
COLOR = interpolateColor(lowerBound, upperBound, POSITION);
}
return COLOR;
}
private Color interpolateColor(final Stop LOWER_BOUND, final Stop UPPER_BOUND, final double POSITION) {
final double POS = (POSITION - LOWER_BOUND.getOffset()) / (UPPER_BOUND.getOffset() - LOWER_BOUND.getOffset());
final double DELTA_RED = (UPPER_BOUND.getColor().getRed() - LOWER_BOUND.getColor().getRed()) * POS;
final double DELTA_GREEN = (UPPER_BOUND.getColor().getGreen() - LOWER_BOUND.getColor().getGreen()) * POS;
final double DELTA_BLUE = (UPPER_BOUND.getColor().getBlue() - LOWER_BOUND.getColor().getBlue()) * POS;
final double DELTA_OPACITY = (UPPER_BOUND.getColor().getOpacity() - LOWER_BOUND.getColor().getOpacity()) * POS;
double red = LOWER_BOUND.getColor().getRed() + DELTA_RED;
double green = LOWER_BOUND.getColor().getGreen() + DELTA_GREEN;
double blue = LOWER_BOUND.getColor().getBlue() + DELTA_BLUE;
double opacity = LOWER_BOUND.getColor().getOpacity() + DELTA_OPACITY;
red = red < 0 ? 0 : (red > 1 ? 1 : red);
green = green < 0 ? 0 : (green > 1 ? 1 : green);
blue = blue < 0 ? 0 : (blue > 1 ? 1 : blue);
opacity = opacity < 0 ? 0 : (opacity > 1 ? 1 : opacity);
return Color.color(red, green, blue, opacity);
}
}