SpinningTransformer.java

package jo.vecmath.logic;

import jo.vecmath.AxisAngle4f;
import jo.vecmath.Matrix4f;
import jo.vecmath.Point3f;

public class SpinningTransformer implements ITransformer {

    private Point3f mByEuler;  // per second
    private AxisAngle4f mByAxis;
    private long mStartTime;

    public SpinningTransformer() {
        mStartTime = System.currentTimeMillis();
    }

    public SpinningTransformer(Point3f rotation) {
        mByEuler = rotation;
        mStartTime = System.currentTimeMillis();
    }

    public SpinningTransformer(AxisAngle4f axis) {
        mByAxis = axis;
        mStartTime = System.currentTimeMillis();
    }

    public SpinningTransformer(Point3f rotation, long startTime) {
        mByEuler = rotation;
        mStartTime = startTime;
    }

    public SpinningTransformer(AxisAngle4f axis, long startTime) {
        mByAxis = axis;
        mStartTime = startTime;
    }

    @Override
    public Matrix4f calcTransform(Matrix4f transform) {
        Matrix4f t;
        long now = System.currentTimeMillis();
        if (now > mStartTime) {
            t = new Matrix4f(transform);
            float seconds = (now - mStartTime) / 1000.0f;
            if (mByEuler != null) {
                Matrix4fLogic.rotateEuler(t, mByEuler.scaleBy(seconds));
            } else {
                t = new Matrix4f();
                AxisAngle4f a = new AxisAngle4f(mByAxis);
                a.angle *= seconds;
                t.set(a);
                t.mul(transform, t);
            }
        } else {
            t = transform;
        }
        return t;
    }

    public long getStartTime() {
        return mStartTime;
    }

    public void setStartTime(long startTime) {
        mStartTime = startTime;
    }

    public Point3f getByEuler() {
        return mByEuler;
    }

    public void setByEuler(Point3f byEuler) {
        mByEuler = byEuler;
    }

    public AxisAngle4f getByAxis() {
        return mByAxis;
    }

    public void setByAxis(AxisAngle4f byAxis) {
        mByAxis = byAxis;
    }
}