Look at the setRotationX() setRotationY() and setScaleX() setScaleY()
They sure make the work much easier
On 12/16/2011 08:59 AM, chowdary nani wrote:
Hi All,
I need help on Image zoom and Image rotate in android with in the same
screen
I am developing using below code.
public class ImageRotateActivity extends Activity {
/** Called when the activity is first created. */
private ImageView img;
private Button rotate;
private Button zoom;
float degrees =0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
zoom=(Button)findViewById(R.id.button2);
zoom.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
setContentView(new Zoom(this));
}
});
rotate = (Button) findViewById(R.id.button1);
rotate.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
setContentView(R.layout.main);
make(degrees);
}
});
}
public void make(float x){
android.util.Log.i("INSIDE MAKE", "inside make");
LinearLayout linLayout = new LinearLayout(this);
// load the origial BitMap (500 x 500 px)
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
R.drawable.honeycomb);
int width = bitmapOrg.getWidth();
int height = bitmapOrg.getHeight();
int newWidth = 200;
int newHeight = 200;
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// rotate the Bitmap
matrix.postRotate(x);
// recreate the new Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
width, height, matrix, true);
// make a Drawable from Bitmap to allow to set the BitMap
// to the ImageView, ImageButton or what ever
BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);
ImageView imageView = new ImageView(this);
// set the Drawable on the ImageView
imageView.setImageDrawable(bmd);
// center the Image
imageView.setScaleType(ScaleType.CENTER);
// add ImageView to the Layout
linLayout.addView(imageView,
new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT
)
);
// set LinearLayout as ContentView
setContentView(linLayout);
android.util.Log.i("GOING OUT MAKE", "going out make");
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_DPAD_UP)// rotate clockwise
// zoomControler+=10;
{
degrees=degrees+10;
make(degrees);
//make(10);
android.util.Log.i("ONE","rotating clockwise by
"+String.valueOf(degrees)+" degrees");
android.util.Log.i("DEGREES","current value
"+String.valueOf(degrees)+" degrees");
}
if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN) // rotate anti-clockwise
{
degrees=degrees-10;
make(degrees);
//make(10);
android.util.Log.i("TWO","rotating anti-clockwise by
"+String.valueOf(degrees)+" degrees");
android.util.Log.i("DEGREES","current value
"+String.valueOf(degrees)+" degrees");
}
// invalidate();
return true;
}
}
public class Zoom extends View {
private Drawable image;
private ImageView img;
float degrees = 0;
private int zoomControler = 20;
public Zoom(Context context) {
super(context);
image = context.getResources().getDrawable(R.drawable.honeycomb);
setFocusable(true);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
// here u can control the width and height of the images........ this
// line is very important
image.setBounds((getWidth() / 2) - zoomControler, (getHeight() / 2)
- zoomControler, (getWidth() / 2) + zoomControler,
(getHeight() / 2) + zoomControler);
image.draw(canvas);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT)// zoom in
zoomControler += 10;
if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) // zoom out
zoomControler -= 10;
if (zoomControler < 10)
zoomControler = 10;
invalidate();
return true;
}
}
Here any one i.e, either zoom or image rotation is getting well but
when trying to use both getting error
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