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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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.google.android.test.transform;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.widget.LinearLayout;
public class TransformTestActivity extends Activity {
public TransformTestActivity() {
super();
init(false);
}
public TransformTestActivity(boolean noCompat) {
super();
init(noCompat);
}
public void init(boolean noCompat) {
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setTitle(R.string.act_title);
LinearLayout root = new LinearLayout(this);
root.setOrientation(LinearLayout.VERTICAL);
TransformView view = new TransformView(getApplicationContext());
Drawable drawable = getResources().getDrawable(R.drawable.logo);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicWidth());
view.setDrawable(drawable);
root.addView(view);
setContentView(root);
}
private class TransformView extends View {
private Drawable mDrawable;
private float mPosX;
private float mPosY;
private float mScale = 1.f;
private Matrix mMatrix;
private ScaleGestureDetector mDetector;
private float mLastX;
private float mLastY;
private class Listener implements ScaleGestureDetector.OnScaleGestureListener {
public boolean onScale(ScaleGestureDetector detector) {
float scale = detector.getScaleFactor();
Log.d("ttest", "Scale: " + scale);
// Limit the scale so our object doesn't get too big or disappear
if (mScale * scale > 0.1f) {
if (mScale * scale < 10.f) {
mScale *= scale;
} else {
mScale = 10.f;
}
} else {
mScale = 0.1f;
}
Log.d("ttest", "mScale: " + mScale + " mPos: (" + mPosX + ", " + mPosY + ")");
float sizeX = mDrawable.getIntrinsicWidth()/2;
float sizeY = mDrawable.getIntrinsicHeight()/2;
float centerX = detector.getFocusX();
float centerY = detector.getFocusY();
float diffX = centerX - mPosX;
float diffY = centerY - mPosY;
diffX = diffX*scale - diffX;
diffY = diffY*scale - diffY;
mPosX -= diffX;
mPosY -= diffY;
mMatrix.reset();
mMatrix.postTranslate(-sizeX, -sizeY);
mMatrix.postScale(mScale, mScale);
mMatrix.postTranslate(mPosX, mPosY);
invalidate();
return true;
}
public boolean onScaleBegin(ScaleGestureDetector detector) {
return true;
}
public void onScaleEnd(ScaleGestureDetector detector) {
mLastX = detector.getFocusX();
mLastY = detector.getFocusY();
}
}
public TransformView(Context context) {
super(context);
mMatrix = new Matrix();
mDetector = new ScaleGestureDetector(context, new Listener());
DisplayMetrics metrics = context.getResources().getDisplayMetrics();
mPosX = metrics.widthPixels/2;
mPosY = metrics.heightPixels/2;
}
public void setDrawable(Drawable d) {
mDrawable = d;
float sizeX = mDrawable.getIntrinsicWidth()/2;
float sizeY = mDrawable.getIntrinsicHeight()/2;
mMatrix.reset();
mMatrix.postTranslate(-sizeX, -sizeY);
mMatrix.postScale(mScale, mScale);
mMatrix.postTranslate(mPosX, mPosY);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mDetector.onTouchEvent(event);
// Handling single finger pan
if (!mDetector.isInProgress()) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastX = event.getX();
mLastY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
final float x = event.getX();
final float y = event.getY();
mPosX += x - mLastX;
mPosY += y - mLastY;
mLastX = x;
mLastY = y;
float sizeX = mDrawable.getIntrinsicWidth()/2;
float sizeY = mDrawable.getIntrinsicHeight()/2;
mMatrix.reset();
mMatrix.postTranslate(-sizeX, -sizeY);
mMatrix.postScale(mScale, mScale);
mMatrix.postTranslate(mPosX, mPosY);
invalidate();
break;
}
}
return true;
}
@Override
public void onDraw(Canvas canvas) {
int saveCount = canvas.getSaveCount();
canvas.save();
canvas.concat(mMatrix);
mDrawable.draw(canvas);
canvas.restoreToCount(saveCount);
}
}
}
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