Fonction zoom layout

Bonjour,

J'aimerai effectuer un zoom sur mon application mobile, pour l'instant je n'ai fait que dessiner des lignes horizontales et verticales afin d'avoir un plan, sur mon canvas, quelqu'un pourrait il m'aider ? Je me suis renseigner sur le sujet et j'ai trouvé plein de tuto qui sont facilement compréhensible mais ils sont différent de ce que je veux car dans leur cas le zoom s'effectue sur une image alors que moi j'aimerai pouvoir zoomer mon plan.

Voici mon code :

IndoorActivity :

Code:

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public class IndoorActivity extends Activity implements OnClickListener {
	public Plan plan;
	private int typeMenuActivated = 1;
 
 
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.indoor);
 
		plan = (Plan) findViewById(R.id.plan);
		plan.setActivity(this);
	}
 
 
 
 
 
 
	@Override
	public void onClick(View arg0) {
		// TODO Auto-generated method stub
 
	}
 
	public int getTypeMenuActivated() {
		return typeMenuActivated;
	}
 
	public void setTypeMenuActivated(int typeMenuActivated) {
		this.typeMenuActivated = typeMenuActivated;
	}
 
}

StartActivity :

Code:

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public class StartActivity extends Activity implements OnClickListener {
 
	private ImageButton indoor;
 
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.start_activity);
 
		indoor = (ImageButton) findViewById(R.id.indoor);
		indoor.setOnClickListener(this);
 
	}
 
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
 
		if (v == indoor) {
			Intent in = new Intent(this, IndoorActivity.class);
			startActivity(in);
		}
	}
 
}

Plan :

Code:

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public class Plan extends View {
	private Paint paint = new Paint();
	private IndoorActivity activity;
	public static double scale = 10.0;
	private Bitmap quadrillage_echelle;
	public static final int NULL = 0;
 
	public Plan(Context context) {
		super(context);
	}
 
	public Plan(Context context, AttributeSet attrs) {
		super(context, attrs);
	}
 
	/**
         * Dessine le repère dans la vue
         * 
         * @version 1.0
         */
	private Bitmap drawEchelle() {
		if (scale != 0) {
 
			quadrillage_echelle = Bitmap.createBitmap(getWidth(), getHeight(),
					Config.ARGB_8888);
			Canvas canvas = new Canvas(quadrillage_echelle);
			Paint paint = new Paint();
			canvas.drawText("1 m",
					(float) ((getWidth() / scale - 3.5) * scale),
					(float) (2 * scale), paint);
			canvas.drawLine((float) ((getWidth() / scale - 4) * scale),
					(float) (2.5 * scale),
					(float) ((getWidth() / scale - 4) * scale),
					(float) (3.5 * scale), paint);
			canvas.drawLine((float) ((getWidth() / scale - 4) * scale),
					(float) (3 * scale),
					(float) ((getWidth() / scale - 2) * scale),
					(float) (3 * scale), paint);
			canvas.drawLine((float) ((getWidth() / scale - 2) * scale),
					(float) (2.5 * scale),
					(float) ((getWidth() / scale - 2) * scale),
					(float) (3.5 * scale), paint);
 
			paint.setColor(Color.argb(20, 0, 0, 0));
			paint.setStrokeWidth(1);
 
			for (float x = 0; x < getWidth(); x = x + (float) scale) {
				canvas.drawLine(x, 0, x, getHeight(), paint);
			}
			for (float y = 0; y < getHeight(); y = y + (float) scale) {
				canvas.drawLine(0, y, getWidth(), y, paint);
			}
			paint.setStrokeWidth(3);
 
			return quadrillage_echelle;
		}
		return null;
	}
 
	public IndoorActivity getAttachedActivity() {
		return activity;
	}
 
	public static double getScale() {
		return 2 * scale;
	}
 
	@Override
	protected void onDraw(Canvas canvas) {
		canvas.save();
 
		paint.setStyle(Style.FILL_AND_STROKE);
		Bitmap tmp = drawEchelle();
 
		if (tmp != null)
			canvas.drawBitmap(tmp, 0, 0, paint);
 
	}
 
	@Override
	public boolean performClick() {
		return super.performClick();
	}
 
	public void setActivity(IndoorActivity activity) {
		this.activity = activity;
	}
 
	public void setScale(double scale) {
		Plan.scale = scale;
	}
 
}

indoor.xml :

Code:

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
 
    <RelativeLayout
        android:id="@+id/MenuGlobal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:background="@color/lightGray"
        android:orientation="vertical" >
 
 
    </RelativeLayout>
 
    <com.example.ligne.indoor.Plan
        android:id="@+id/plan"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/MenuGlobal" />
 
</RelativeLayout>

start_activity :

Code:

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".StartActivity" >
 
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_margin="0px"
        android:padding="0px" >
 
        <ImageButton
            android:id="@+id/indoor"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="0px"
            android:padding="0px"
            android:src="@drawable/play" />
    </RelativeLayout>
 
</RelativeLayout>