/*
* Licensed to "Neo Technology," Network Engine for Objects in Lund AB
* (http://neotechnology.com) under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. Neo Technology licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License
* at (http://www.apache.org/licenses/LICENSE-2.0). Unless required by
* applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
* OF ANY KIND, either express or implied. See the License for the specific
* language governing permissions and limitations under the License.
*/
package org.neo4j.neoclipse.decorate;
public class SimpleHueGenerator
{
private float startHue = 60.0f;
/**
* Current color (not corrected for the start hue).
*/
private float hue = 0;
/**
* Amount to move from one color to the next.
*/
private float moveAngle = 180.0f;
/**
* At what insertion point to start the next series of colors.
*/
private float startAngle = 180.0f;
/**
* Number of steps rendering current series of colors.
*/
private int totalSteps = 1;
/**
* Counter for the step in the current series of colors was created. The
* value -2 makes sure the first series is created correctly.
*/
private int currentStep = -2;
/**
* Common constructor.
*/
public SimpleHueGenerator()
{
// Correct for the addition of 180 in the first call of next().
startHue = limitHue( startHue + 180.0f );
}
/**
* Construct the color generator with a specified start hue.
* @param hue
* hue of the first color generated
*/
public SimpleHueGenerator( final float hue )
{
startHue = limitHue( hue + 180.0f );
}
public float nextHue()
{
currentStep++;
if ( currentStep >= totalSteps )
{
totalSteps *= 2;
currentStep = 0;
moveAngle = startAngle;
startAngle /= 2.0f;
hue = startAngle;
}
hue = limitHue( hue + moveAngle );
return limitHue( startHue + hue );
}
/**
* Limit hues to 0-360.
* @param hue
* the hue to limit
* @return the limited hue
*/
private float limitHue( final float hue )
{
float newHue = hue;
while ( newHue >= 360.0f )
{
newHue -= 360.0f;
}
return newHue;
}
}