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POHow can I zoom in bitmap without using matrix?
 

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  1. POHow can I zoom in bitmap without using matrix?
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    <p>How can I zoom the image without using matrix in android?</p> <p>Here is the code that I am using:</p> <pre><code>public class SimpImageView extends BaseView{ private Bitmap image = null; private Paint borderPaint = null; PointF start = new PointF(); PointF lastPosition = new PointF(); Matrix savedMatrix = new Matrix(); private Paint imagePaint = null; private Matrix matrix = null; public Bitmap getImage() { return image; } public void setImage(Bitmap image) { this.image = image; } public SimpImageView(Bitmap image,int x,int y,int width,int height){ super(x, y, width, height); this.image = image; borderPaint = new Paint(); borderPaint.setARGB(255, 255, 128, 128); borderPaint.setStyle(Paint.Style.STROKE); borderPaint.setStrokeWidth(2); imagePaint = new Paint(); imagePaint.setARGB(32, 255, 255, 255); imagePaint.setStyle(Paint.Style.FILL); } /* (non-Javadoc) * @see com.simplogics.surfaceview.Views.BaseView#onDraw(android.graphics.Canvas) */ @Override public void onDraw(Canvas canvas) { // TODO Auto-generated method stub canvas.drawBitmap(image, getBounds().left, getBounds().top, null); // canvas.drawBitmap(image, matrix, new Paint()); // canvas.drawBitmap(image, matrix, borderPaint); // canvas.drawRect(getBounds() , borderPaint); } /* (non-Javadoc) * @see com.simplogics.surfaceview.Views.BaseView#onTouchEvent(android.view.MotionEvent) */ static final int NONE = 0; static final int DRAG = 1; static final int ZOOM = 2; int mode = NONE; @Override public boolean onTouchEvent(MotionEvent event) { boolean handled = false; Log.d("SimpEditText", "(int)event.getX() " + (int)event.getX()); Log.d("SimpEditText", "(int)event.getY() " + (int)event.getY()); if(isTouchedInBounds((int)event.getX(), (int)event.getY())){ Log.d("SimpEditText", "Touched in Bounds"); handled = true; switch (event.getAction() &amp; MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: start.set(event.getX(), event.getY()); lastPosition.x = getBounds().left; lastPosition.y = getBounds().top; Log.d("VerticalLabelView", "mode=DRAG"); mode = DRAG; break; case MotionEvent.ACTION_POINTER_DOWN: mode = ZOOM; Log.d("VerticalLabelView", "mode=ZOOM"); break; case MotionEvent.ACTION_UP: mode = NONE; break; case MotionEvent.ACTION_POINTER_UP: mode = NONE; Log.d("VerticalLabelView", "mode=NONE"); break; case MotionEvent.ACTION_MOVE: if (mode == DRAG) { int x = (int)(event.getX() - start.x); int y = (int)(event.getY() - start.y); setPosition((int)lastPosition.x + x, (int)lastPosition.y + y); mode = DRAG; break; }else if(mode == ZOOM){ Log.d("SimpImageView", "MODE=ZOOM"); Log.d("SimpImageView", "getImage().getWidth()="+getImage().getWidth()); Log.d("SimpImageView"," getImage().getHeight()="+getImage().getHeight()); } break; } } return handled; } } </code></pre> <p>baseView.java</p> <pre><code>public abstract class BaseView { private int id = -1; private Object tag = null; private Rect bounds = null; public Rect getBounds() { return bounds; } public BaseView() { bounds = new Rect(); } public BaseView(int x, int y, int width, int height) { bounds = new Rect(x, y, x + width, y + height); } public abstract void onDraw(Canvas canvas); public abstract boolean onTouchEvent(MotionEvent event); public void setBounds(int x, int y, int width, int height){ bounds.set(x, y, x + width, y + height); } public void setPosition(int x, int y){ if(x &lt;= 0 || y &lt;= 0){ Log.e("SimpEditText1", "----------------------------------------------------------"); Log.e("SimpEditText1", "-------------0000000000000000000000000000000000------------"); Log.e("SimpEditText1", "----------------------------------------------------------"); } bounds.set(x, y, x + bounds.width(), y + bounds.height()); } public void setScale(int x,int y,int width,int height){ bounds.set(x, y, x + bounds.width()+width, y + bounds.height()+height); } protected boolean isTouchedInBounds(int xPos, int yPos){ return bounds.contains(xPos, yPos); } public Object getTag() { return tag; } public void setTag(Object tag) { this.tag = tag; } public int getId() { return id; } public void setId(int id) { this.id = id; } /** * @param w * @param h * @param oldw * @param oldh */ } </code></pre>
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    1. PTQuestion
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    1. USpranavjayadev
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      1. POHow can I zoom in bitmap without using matrix?
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    1. COwhy without Matrix? any reason?
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      1. POHow can I zoom in bitmap without using matrix?
      1. USSimon Dorociak
    2. COYour BaseView needs to extend a View class. Also i cannot think of any reason not to use a matrix. You could of course use Bitmap.createScaledBitmap() to create a new bitmap when the zoomlevel changes. But this solution has memory and performance problems.
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      1. POHow can I zoom in bitmap without using matrix?
      1. USRenard
 

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