Anti-aliasing solution for Android programming drawing _android

An example of this paper is to analyze the anti aliasing method of Android programming drawing. Share to everyone for your reference, specific as follows:

When drawing, the picture, if rotated or scaled, will always appear in those gorgeous jagged. In fact, Android has its own way of dealing with it.

Method One: Add anti-aliasing mark to paint. The Paint object is then passed as an argument to the canvas drawing method.

Copy Code code as follows:

Paint.setantialias (TRUE);

Method Two: To add anti-aliasing mark to canvas.

Some places can not use paint, directly to canvas add anti-aliasing, more convenient.

Copy Code code as follows:

Canvas.setdrawfilter (New Paintflagsdrawfilter (0, Paint.anti_alias_flag| Paint.filter_bitmap_flag));

The test code is as follows:

Import Android.content.Context;
Import Android.graphics.Bitmap;
Import Android.graphics.BitmapFactory;
Import Android.graphics.Canvas;
Import Android.graphics.Matrix;
Import Android.graphics.Paint;
Import Android.graphics.PaintFlagsDrawFilter;
Import Android.view.View;
  public class MyView extends View {private Paintflagsdrawfilter PFD;
  Private Paint Mpaint = new Paint ();
  Private Matrix matrix = new Matrix ();
  Private Bitmap bmp;
    Public MyView {Super (context);
  Initialize (); private void Initialize () {PFD = new Paintflagsdrawfilter (0, Paint.anti_alias_flag|
    Paint.filter_bitmap_flag);
    Mpaint.setantialias (TRUE);
    Matrix.setrotate (30);
    Matrix.postscale (0.5f, 0.5f);
  BMP = Bitmapfactory.decoderesource (Getresources (), r.drawable.show);
    @Override public void Dispatchdraw (Canvas Canvas) {canvas.translate (100, 0);
    Canvas.drawbitmap (BMP, Matrix, NULL);
    Canvas.translate (0, 250); Canvas.drawbitmap (BMP, Matrix, MPaint);
    Canvas.setdrawfilter (PFD);
    Canvas.translate (0, 250);
  Canvas.drawbitmap (BMP, Matrix, NULL);

 }
}

The following illustration is an effect:

As can be seen, both methods are quite effective.

I hope this article will help you with the Android program.