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/*
* Copyright (c) 2012 Jason Polites
*
* 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 com.polites.android;
import android.graphics.PointF;
public class ZoomAnimation implements Animation {
private boolean firstFrame = true;
private float touchX;
private float touchY;
private float zoom;
private float startX;
private float startY;
private float startScale;
private float xDiff;
private float yDiff;
private float scaleDiff;
private long animationLengthMS = 200;
private long totalTime = 0;
private ZoomAnimationListener zoomAnimationListener;
/* (non-Javadoc)
* @see com.polites.android.Animation#update(com.polites.android.GestureImageView, long)
*/
@Override
public boolean update(GestureImageView view, long time) {
if(firstFrame) {
firstFrame = false;
startX = view.getImageX();
startY = view.getImageY();
startScale = view.getScale();
scaleDiff = (zoom * startScale) - startScale;
if(scaleDiff > 0) {
// Calculate destination for midpoint
VectorF vector = new VectorF();
// Set the touch point as start because we want to move the end
vector.setStart(new PointF(touchX, touchY));
vector.setEnd(new PointF(startX, startY));
vector.calculateAngle();
// Get the current length
float length = vector.calculateLength();
// Multiply length by zoom to get the new length
vector.length = length*zoom;
// Now deduce the new endpoint
vector.calculateEndPoint();
xDiff = vector.end.x - startX;
yDiff = vector.end.y - startY;
}
else {
// Zoom out to center
xDiff = view.getCenterX() - startX;
yDiff = view.getCenterY() - startY;
}
}
totalTime += time;
float ratio = (float) totalTime / (float) animationLengthMS;
if(ratio < 1) {
if(ratio > 0) {
// we still have time left
float newScale = (ratio * scaleDiff) + startScale;
float newX = (ratio * xDiff) + startX;
float newY = (ratio * yDiff) + startY;
if(zoomAnimationListener != null) {
zoomAnimationListener.onZoom(newScale, newX, newY);
}
}
return true;
}
else {
float newScale = scaleDiff + startScale;
float newX = xDiff + startX;
float newY = yDiff + startY;
if(zoomAnimationListener != null) {
zoomAnimationListener.onZoom(newScale, newX, newY);
zoomAnimationListener.onComplete();
}
return false;
}
}
public void reset() {
firstFrame = true;
totalTime = 0;
}
public float getZoom() {
return zoom;
}
public void setZoom(float zoom) {
this.zoom = zoom;
}
public float getTouchX() {
return touchX;
}
public void setTouchX(float touchX) {
this.touchX = touchX;
}
public float getTouchY() {
return touchY;
}
public void setTouchY(float touchY) {
this.touchY = touchY;
}
public long getAnimationLengthMS() {
return animationLengthMS;
}
public void setAnimationLengthMS(long animationLengthMS) {
this.animationLengthMS = animationLengthMS;
}
public ZoomAnimationListener getZoomAnimationListener() {
return zoomAnimationListener;
}
public void setZoomAnimationListener(ZoomAnimationListener zoomAnimationListener) {
this.zoomAnimationListener = zoomAnimationListener;
}
}
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