Application: gvSIG desktop

package com.iver.cit.gvsig.animation.test;

import java.awt.geom.Rectangle2D;

import java.util.List;

import com.iver.cit.gvsig.animation.keyframe.IInterpolator;

import com.iver.cit.gvsig.animation.keyframe.IKeyFrame;

import com.iver.cit.gvsig.fmap.ViewPort;

import com.iver.cit.gvsig.project.documents.view.gui.View;

public class Interpolator2D implements IInterpolator {

        public View view;

        public IKeyFrame interpolate(List kfList, int index, double time) {

                KeyFrame2D KF = new KeyFrame2D();

                if (kfList == null)

                        return null;

                if (this.view == null)

                        return null;

                switch (kfList.size()) {

                // this case when there are only has 2 keyframes

                case 2:

                        // getting the keyframes

                        KeyFrame2D kf1 = (KeyFrame2D) kfList.get(0);

                        KeyFrame2D kf2 = (KeyFrame2D) kfList.get(1);

                        if (index == 1) {

                                KeyFrame2D kaux = kf1;

                                kf1 = kf2;

                                kf2 = kaux;

                        }

                        ViewPort vp1 = (ViewPort) kf1.getAnimatedObject();

                        ViewPort vp2 = (ViewPort) kf2.getAnimatedObject();

                        ViewPort vp = view.getMapControl().getViewPort();

                        double left = linearInterpolate(vp1.getExtent().getMinX(), vp2

                                        .getExtent().getMinX(), kf1.getTime(), kf2.getTime(), time);

                        double top = linearInterpolate(vp1.getExtent().getMinX(), vp2

                                        .getExtent().getMinX(), kf1.getTime(), kf2.getTime(), time);

                        double right = linearInterpolate(vp1.getExtent().getMinX(), vp2

                                        .getExtent().getMinX(), kf1.getTime(), kf2.getTime(), time);

                        double bottom = linearInterpolate(vp1.getExtent().getMinX(), vp2

                                        .getExtent().getMinX(), kf1.getTime(), kf2.getTime(), time);

                        Rectangle2D newExtent = new Rectangle2D.Double(left, top, right

                                        - left, bottom - top);

                        vp.setExtent(newExtent);

                        break;

                }

                return KF;

        }

        private double linearInterpolate(double minX, double minX2, double timePos,

                        double timePos2, double time) {

                // P1 + (P2-P1)*((t-t1)/(t2-t1))

                return (minX + (minX2 - minX)

                                * ((time - timePos) / (timePos2 - timePos)));

        }

        public Object getAnimatedObject() {

                return this.view;

        }

        public void setAnimatedObject(Object ani) {

                this.view = (View) ani;

        }

}