Draw smoothly scaled bitmaps on Canvas

android android-canvas antialiasing
fhucho picture fhucho · Nov 27, 2010 · Viewed 43.1k times · Source

This is how I draw Bitmap on Canvas in my Android app:

canvas.save();
canvas.scale(scale, scale, x, y);
canvas.drawBitmap(bitmap, x, y, null);
canvas.restore();

However the Bitmap is not scaled smoothly, no anti-aliasing is performed. How can I enable anti-aliasing?

Answer

Vit Khudenko picture Vit Khudenko · Nov 27, 2010

Try this:

Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);

canvas.drawBitmap(bitmap, x, y, paint);

Related questions

Can I draw with antialiasing on canvas?

Can I draw with anti-aliasing on canvas? I need my circles and line have smooth edges.

Read More
Android canvas draw rectangle

how to draw empty rectangle with etc. borderWidth=3 and borderColor=black and part within rectangle don't have content or color. Which function in Canvas to use void drawRect(float left, float top, float right, float bottom, Paint paint) void drawRect(…

Read More
How to draw circle by canvas in Android?

I want to draw circle by canvas. Here is my code: [MyActivity.java]: public class MyActivity extends Activity { public void onCreate(Bundle savedInstanceState) { ... setContentView(new View(this,w,h)); } } [View.java]: public class View extends SurfaceView { public View(Context context, …

Read More