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A Java based CSG Cad library

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/*
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 */
package eu.mihosoft.vrl.v3d;

// TODO: Auto-generated Javadoc
/**
 * Modifies along z axis.
 *
 * @author Michael Hoffer <[email protected]>
 */
public class ZModifier implements WeightFunction {

    /** The bounds. */
    private Bounds bounds;
    
    /** The min. */
    private double min = 0;
    
    /** The max. */
    private double max = 1.0;

    /** The s per unit. */
    private double sPerUnit;
    
    /** The centered. */
    private boolean centered;

    /**
     * Constructor.
     */
    public ZModifier() {
    }

    /**
     * Constructor.
     *
     * @param centered defines whether to center origin at the csg location
     */
    public ZModifier(boolean centered) {
        this.centered = centered;
    }

    /* (non-Javadoc)
     * @see eu.mihosoft.vrl.v3d.WeightFunction#eval(eu.mihosoft.vrl.v3d.Vector3d, eu.mihosoft.vrl.v3d.CSG)
     */
    @Override
    public double eval(Vector3d pos, CSG csg) {

        if (bounds == null) {
            this.bounds = csg.getBounds();
            sPerUnit = (max - min) / (bounds.getMax().z - bounds.getMin().z);
        }

        double s = sPerUnit * (pos.z - bounds.getMin().z);

        if (centered) {
            s = s - (max - min) / 2.0;

            s = Math.abs(s) * 2;
        }

        return s;
    }

}