eu.hansolo.fx.charts.tools.CatmullRom Maven / Gradle / Ivy

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Charts is a JavaFX 8 library containing different kind of charts

There is a newer version: 1.0.5

/*
 * Copyright (c) 2017 by Gerrit Grunwald
 *
 * Licensed 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 eu.hansolo.fx.charts.tools;

public class CatmullRom {
    private CatmullRomSpline splineXValues;
    private CatmullRomSpline splineYValues;


    // ******************** Constructors **************************************
    public CatmullRom(final T P0, final T P1, final T P2, final T P3) {
        assert P0 != null : "p0 cannot be null";
        assert P1 != null : "p1 cannot be null";
        assert P2 != null : "p2 cannot be null";
        assert P3 != null : "p3 cannot be null";

        splineXValues = new CatmullRomSpline(P0.getX(), P1.getX(), P2.getX(), P3.getX());
        splineYValues = new CatmullRomSpline(P0.getY(), P1.getY(), P2.getY(), P3.getY());
    }


    // ******************** Methods *******************************************
    public T q(final double T) { return (T) new Point(splineXValues.q(T), splineYValues.q(T)); }


    // ******************** Inner Classes *************************************
    class CatmullRomSpline {
        private double p0;
        private double p1;
        private double p2;
        private double p3;


        // ******************** Constructors **********************************
        protected CatmullRomSpline(final double P0, final double P1, final double P2, final double P3) {
            p0 = P0;
            p1 = P1;
            p2 = P2;
            p3 = P3;
        }


        // ******************** Methods ***************************************
        protected double q(final double T) {
            return 0.5 * ((2 * p1) + (p2 - p0) * T + (2 * p0 - 5 * p1 + 4 * p2 - p3) * T * T + (3 * p1 -p0 - 3 * p2 + p3) * T * T * T);
        }
    }
}