Performs a Catmull-Rom interpolation using the specified positions. - Java java.lang

Java examples for java.lang:Math Algorithm

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Description

Performs a Catmull-Rom interpolation using the specified positions.

Demo Code


//package com.java2s;

public class Main {
    /**/*from   www .  j  a va 2  s.co  m*/
     * Performs a Catmull-Rom interpolation using the specified positions.
     * 
     * @param value1
     *        The first position in the interpolation.
     * @param value2
     *        The second position in the interpolation.
     * @param value3
     *        The third position in the interpolation.
     * @param value4
     *        The fourth position in the interpolation.
     * @param amount
     *        Weighting factor.
     * @return A position that is the result of the Catmull-Rom interpolation.
     */
    public static float catmullRom(float value1, float value2,
            float value3, float value4, float amount) {
        // Using formula from http://www.mvps.org/directx/articles/catmull/
        // Internally using doubles not to lose precission
        double amountSquared = amount * amount;
        double amountCubed = amountSquared * amount;
        return (float) (0.5 * (2.0 * value2 + (value3 - value1) * amount
                + (2.0 * value1 - 5.0 * value2 + 4.0 * value3 - value4)
                * amountSquared + (3.0 * value2 - value1 - 3.0 * value3 + value4)
                * amountCubed));
    }
}

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