hello all,
i used matrix to rotate instead of the canvas.
However, the result isn't what i expected. The path just rotate
infinitely without stopping.
below is my code. it is a modification of the compass.java in
apidemo. can someone please give me some advice on this?
import android.content.Context;
import android.graphics.*;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Config;
import android.util.Log;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
public class Compass extends GraphicsActivity {
private static final String TAG = "Compass";
private SensorManager mSensorManager;
private SampleView mView;
private float[] mValues;
private final SensorListener mListener = new SensorListener()
{
public void onSensorChanged(int sensor, float[] values)
{
if (Config.LOGD) Log.d(TAG, "sensorChanged (" + values[0]
+ ", " + values[1] + ", " + values[2] + ")");
mValues = values;
if (mView != null) {
mView.invalidate();
}
}
public void onAccuracyChanged(int sensor, int accuracy)
{
// TODO Auto-generated method stub
}
};
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
mSensorManager =
(SensorManager)getSystemService(Context.SENSOR_SERVICE);
mView = new SampleView(this);
setContentView(mView);
}
@Override
protected void onResume()
{
if (Config.LOGD) Log.d(TAG, "onResume");
super.onResume();
mSensorManager.registerListener(mListener,
SensorManager.SENSOR_ORIENTATION,
SensorManager.SENSOR_DELAY_GAME);
}
@Override
protected void onStop()
{
if (Config.LOGD) Log.d(TAG, "onStop");
mSensorManager.unregisterListener(mListener);
super.onStop();
}
private class SampleView extends View {
private Paint mPaint = new Paint();
private Path mPath = new Path();
private boolean mAnimate;
private long mNextTime;
private Matrix matrix = new Matrix();
public SampleView(Context context) {
super(context);
// Construct a wedge-shaped path
mPath.moveTo(0, -50);
mPath.lineTo(-20, 60);
mPath.lineTo(0, 50);
mPath.lineTo(20, 60);
mPath.close();
matrix.postScale(10, 10);
}
@Override protected void onDraw(Canvas canvas) {
Paint paint2 = new Paint();
paint2.setColor(Color.BLUE);
paint2.setStyle(Paint.Style.FILL);
paint2.setAlpha(120);
Paint paint3 = new Paint();
paint3.setColor(Color.GREEN);
paint3.setStyle(Paint.Style.FILL);
paint3.setAlpha(200);
Paint paint4 = new Paint();
paint4.setColor(Color.GRAY);
paint4.setStyle(Paint.Style.FILL);
paint4.setAlpha(120);
Paint paint5 = new Paint();
paint5.setColor(Color.GRAY);
paint5.setStyle(Paint.Style.FILL_AND_STROKE);
paint5.setAlpha(120);
Paint paint = mPaint;
canvas.drawColor(Color.WHITE);
paint.setAntiAlias(true);
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.FILL);
paint.setAlpha(120);
int w = canvas.getWidth();
int h = canvas.getHeight();
int cx = w / 2;
int cy = h / 2;
canvas.translate(cx, cy);
if (mValues != null) {
matrix.setRotate(-mValues[0]);
mPath.transform(matrix);
// canvas.rotate(-mValues[0]);
}
canvas.drawPath(mPath, mPaint);
String str = "";
String direction = "";
if (mValues != null) {
str = "Azimuth: " + Float.toString(-mValues[0]);
if(-mValues[0] < 0 && -mValues[0] > -1){
direction = "Direction: North";
}else if(-mValues[0] < 1 && -mValues[0] > -90){
direction = "Direction: North East";
}else if(-mValues[0] < -90 && -mValues[0] > -91){
direction = "Direction: East";
}else if(-mValues[0] < -91 && -mValues[0] > -180){
direction = "Direction: South East";
}else if(-mValues[0] < -180 && -mValues[0] > -181){
direction = "Direction: South";
}else if(-mValues[0] < -181 && -mValues[0] > -270){
direction = "Direction: South West";
}else if(-mValues[0] < -270 && -mValues[0] > -271){
direction = "Direction: West";
}else if(-mValues[0] < -271 && -mValues[0] > -360){
direction = "Direction: North West";
}
}
canvas.drawText(str, 0, 100, mPaint);
canvas.drawText(direction, 0, 110, mPaint);
canvas.drawCircle(0, 200, 20, paint2);
canvas.drawCircle(0, 200, 4, paint3);
canvas.drawCircle(0, 200, 30, paint4);
canvas.drawCircle(0, 200, 50, paint4);
}
@Override
protected void onAttachedToWindow() {
mAnimate = true;
super.onAttachedToWindow();
}
@Override
protected void onDetachedFromWindow() {
mAnimate = false;
super.onDetachedFromWindow();
}
}
}
On Sep 8, 4:18 pm, dadada <[email protected]> wrote:
> hi all,
>
> i tried the sample compass app in apidemo. When there's a new reading
> in azimuth, i write the reading on canvas. However, the canvas is set
> to rotate when new reading comes in, to simulate the rotation of the
> compass arrow.
>
> Is there an alternative to just rotate the bitmap rather than the
> canvas. there don seems to have rotate method on bitmap or path.
>
> any advices?
>
> /bryan
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