If you want the image in the center of the screen, change this:
Y = initialY;
to this:
* Y = (int) (screenH /2) - (arrowH / 2) ;*
On Thursday, September 13, 2012 12:43:56 AM UTC-5, Haris wrote:
>
>
> Hai here is my full code...........
>
> package com.motionsensor;
>
> import java.util.List;
>
> import android.app.Activity;
> import android.content.Context;
> import android.graphics.Bitmap;
> import android.graphics.BitmapFactory;
> import android.graphics.Canvas;
> import android.graphics.Color;
> import android.graphics.Matrix;
> import android.graphics.Paint;
> import android.graphics.Paint.Style;
> import android.hardware.Sensor;
> import android.hardware.SensorEvent;
> import android.hardware.SensorEventListener;
> import android.hardware.SensorManager;
> import android.os.Bundle;
> import android.view.View;
> import android.widget.TextView;
> import android.widget.Toast;
>
> public class MainActivity extends Activity {
>
>
>
> TextView textviewAzimuth, textviewPitch, textviewRoll;
> private static SensorManager mySensorManager;
> private boolean sersorrunning;
> float[] sensorVlaues = new float[3];
> /** Called when the activity is first created. */
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> View v=new MoveArrow(this);
> setContentView(v);
> textviewAzimuth = (TextView)findViewById(R.id.textazimuth);
> textviewPitch = (TextView)findViewById(R.id.textpitch);
> textviewRoll = (TextView)findViewById(R.id.textroll);
>
> mySensorManager =
> (SensorManager)getSystemService(Context.SENSOR_SERVICE);
> List<Sensor> mySensors =
> mySensorManager.getSensorList(Sensor.TYPE_ORIENTATION);
>
> if(mySensors.size() > 0){
> mySensorManager.registerListener(mySensorEventListener,
> mySensors.get(0), SensorManager.SENSOR_DELAY_NORMAL);
> sersorrunning = true;
> Toast.makeText(this, "Start ORIENTATION Sensor",
> Toast.LENGTH_LONG).show();
> }
> else{
> Toast.makeText(this, "No ORIENTATION Sensor",
> Toast.LENGTH_LONG).show();
> sersorrunning = false;
> finish();
> }
>
>
>
>
> }
>
> private SensorEventListener mySensorEventListener = new
> SensorEventListener() {
>
> @Override
> public void onSensorChanged(SensorEvent event) {
>
> sensorVlaues = event.values.clone();
>
>
>
> MoveArrow.azimuth = String.valueOf(sensorVlaues[0]);
> MoveArrow.pitch = String.valueOf(sensorVlaues[1]);
> MoveArrow.roll = String.valueOf(sensorVlaues[2]);
> MoveArrow.angle = -1*(int) sensorVlaues[2];
>
> }
>
>
>
>
>
> @Override
> public void onAccuracyChanged(Sensor sensor, int accuracy) {
> // TODO Auto-generated method stub
>
> }
> };
>
> @Override
> protected void onDestroy() {
> // TODO Auto-generated method stub
> super.onDestroy();
>
> if(sersorrunning){
> mySensorManager.unregisterListener(mySensorEventListener);
> Toast.makeText(MainActivity.this, "unregisterListener",
> Toast.LENGTH_SHORT).show();
> }
> }
> }
>
>
> class MoveArrow extends View {
> int screenW;
> int screenH;
> static int X;
> static int Y;
> int initialY ;
> int arrowW;
> int arrowH;
> int dX_Prev =0;
> int dY_Prev =0;
> static int dX_Pres =0;
> static int dY_Pres =0;
> static int angle;
> int dX =0;
> int dY =0;
>
> float acc;
> Bitmap arrow, bgr;
> static String azimuth="0";
> static String pitch="0";
> static String roll="0";
> public MoveArrow(Context context) {
> super(context);
> arrow =
> BitmapFactory.decodeResource(getResources(),R.drawable.arrow); //load a
> arrow image
> bgr =
> BitmapFactory.decodeResource(getResources(),R.drawable.graph); //load a
> background
> arrowW = arrow.getWidth();
> arrowH = arrow.getHeight();
> acc = 0.2f; //acceleration
> dY = 0; //vertical speed
> initialY = 100; //Initial vertical position.
> angle = 0; //Start value for rotation angle.
> }
>
>
> @Override
> public void onSizeChanged (int w, int h, int oldw, int oldh) {
> super.onSizeChanged(w, h, oldw, oldh);
> screenW = w;
> screenH = h;
> bgr = Bitmap.createScaledBitmap(bgr, w, h, true); //Resize
> background to fit the screen.
> X = (int) (screenW /2) - (arrowW / 2) ; //Centre arrow into the
> centre of the screen.
> Y = initialY;
> }
>
> @Override
> public void onDraw(Canvas canvas) {
> super.onDraw(canvas);
> Paint paint = new Paint();
> paint.setColor(Color.BLACK);
> paint.setStyle(Style.FILL);
> paint.setTextSize(12);
> paint.setColor(Color.BLUE);
> //Draw background.
> canvas.drawBitmap(bgr, 0, 0, null);
>
>
>
> int newWidth = arrowW;
> int newHeight = arrowH;
> float scaleWidth = 1;
> float scaleHeight = 1;
> int centrex = arrowW/2;
> int centrey = arrowH/2;
>
>
> Matrix matrix = new Matrix();
> matrix.postScale(scaleWidth, scaleHeight);
> matrix.postRotate(angle, X+centrex , Y+centrey );
> Bitmap resizedBitmap = Bitmap.createBitmap(arrow, 0, 0,
> arrow.getWidth(), arrow.getHeight(), matrix, true);
>
>
> canvas.save(Canvas.MATRIX_SAVE_FLAG);
> canvas.rotate(angle, X + resizedBitmap.getWidth()/2, Y +
> resizedBitmap.getHeight()/2);
> super.dispatchDraw(canvas);
> canvas.drawBitmap(resizedBitmap, X, Y, null); //Draw the arrow on
> the rotated canvas.
> canvas.restore();
>
> invalidate();
> }
> }
>
>
> And I am using an arrow image as my rotating image.....
>
> On Thursday, 13 September 2012 10:44:35 UTC+5:30, Haris wrote:
>>
>> Hai bob thanks for reply.....
>>
>> I made the above change in my code but still the same result....And my
>> image get distorted it's edges while rotation......
>>
>> On Wednesday, 12 September 2012 20:04:12 UTC+5:30, bob wrote:
>>>
>>> Well, for one thing, this is not right:
>>>
>>> canvas.rotate(angle, X + getWidth() >> 1, Y + getHeight() >> 1);
>>>
>>> You should be calling getWidth and getHeight on the bitmap.
>>>
>>> Something like this:
>>>
>>> canvas.rotate(angle, X + resizedBitmap.getWidth()/2, Y +
>>> resizedBitmap.getHeight()/2);
>>>
>>>
>>>
>>> On Tuesday, September 11, 2012 12:54:59 AM UTC-5, HPP wrote:
>>>>
>>>> Hai thanks for the replys........
>>>>
>>>> I changed my code like
>>>>
>>>> matrix.postScale(scaleWidth, scaleHeight);
>>>> matrix.postRotate(angle, X+centrex , Y+centrey );
>>>> canvas.setMatrix(matrix);
>>>>
>>>> Bitmap resizedBitmap = Bitmap.createBitmap(arrow, 0, 0,
>>>> arrow.getWidth(), arrow.getHeight(), matrix, true);
>>>> canvas.save(Canvas.MATRIX_SAVE_FLAG);
>>>> canvas.rotate(angle, *X + *getWidth() >> 1, *Y +* getHeight()
>>>> >> 1);
>>>> super.dispatchDraw(canvas);
>>>> canvas.drawBitmap(resizedBitmap, X, Y, null); //Draw the arrow
>>>> on the rotated canvas.
>>>> canvas.restore();
>>>>
>>>> But still it's not rotating about the centre.......
>>>>
>>>>
>>>>
>>>> On Tuesday, 11 September 2012 01:49:30 UTC+5:30, bob wrote:
>>>>>
>>>>> canvas.save(Canvas.MATRIX_SAVE_FLAG);
>>>>> canvas.rotate(angle, *X + *getWidth() >> 1, *Y +* getHeight() >> 1);
>>>>> super.dispatchDraw(canvas);
>>>>> canvas.restore();
>>>>>
>>>>> On Monday, September 10, 2012 2:22:15 PM UTC-5, lbendlin wrote:
>>>>>>
>>>>>> canvas.save(Canvas.MATRIX_SAVE_FLAG);
>>>>>> canvas.rotate(angle, getWidth() >> 1, getHeight() >> 1);
>>>>>> super.dispatchDraw(canvas);
>>>>>> canvas.restore();
>>>>>>
>>>>>> On Monday, September 10, 2012 9:18:32 AM UTC-4, Haris wrote:
>>>>>>>
>>>>>>> Hai all
>>>>>>>
>>>>>>> I am trying an application like rotating image with motion
>>>>>>> sensor....My problem is that the image does not rotate about centre
>>>>>>> properly....And my angle range is 0 to 90 and 0 to -90..
>>>>>>> And below is my code.....
>>>>>>>
>>>>>>> public void onDraw(Canvas canvas) {
>>>>>>> super.onDraw(canvas);
>>>>>>> Bitmap arrow =
>>>>>>> BitmapFactory.decodeResource(getResources(),R.drawable.arrow);
>>>>>>> int arrowW = arrow.getWidth();
>>>>>>> int arrowH = arrow.getHeight();
>>>>>>> float scaleWidth = 1;
>>>>>>> float scaleHeight = 1;
>>>>>>> int centrex = arrowW/2;
>>>>>>> int centrey = arrowH/2;
>>>>>>> int X=108;
>>>>>>> int Y=100;
>>>>>>> int angle=0;
>>>>>>>
>>>>>>> Matrix matrix = new Matrix();
>>>>>>> matrix.postScale(scaleWidth, scaleHeight);
>>>>>>>
>>>>>>> matrix.postRotate(angle, X+centrex , Y+centrey );
>>>>>>> Bitmap resizedBitmap = Bitmap.createBitmap(arrow, 0, 0,
>>>>>>> arrow.getWidth(), arrow.getHeight(), matrix, true);
>>>>>>> canvas.save();
>>>>>>> canvas.drawBitmap(resizedBitmap, X, Y, null);
>>>>>>> invalidate();
>>>>>>> }
>>>>>>>
>>>>>>> I am getting the angle values from onCreate method.....Using
>>>>>>> orientation sensor(roll values)..
>>>>>>> But When I rotate the screen my image is rotating but not exactly
>>>>>>> around the image centre.....
>>>>>>>
>>>>>>> Thanks......
>>>>>>>
>>>>>>
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