Android的油漆/畫布問題;繪製平滑曲線

Question

當我用手指在Android的觸摸屏上繪製時，如何獲得平滑曲線而不是圓點或圓圈？我使用下面的代碼 -

public class DrawView extends View implements OnTouchListener { 
private static final String TAG = "DrawView"; 

List<Point> points = new ArrayList<Point>(); 
Paint paint = new Paint(); 

public DrawView(Context context) { 
    super(context); 
    setFocusable(true); 
    setFocusableInTouchMode(true); 

    this.setOnTouchListener(this); 

    paint.setColor(Color.WHITE); 
    paint.setAntiAlias(true); 
} 

    @Override 
    public void onDraw(Canvas canvas) { 
    for (Point point : points) { 
     canvas.drawCircle(point.x, point.y, 5, paint); 
     // Log.d(TAG, "Painting: "+point); 
    } 
} 

public boolean onTouch(View view, MotionEvent event) { 
    // if(event.getAction() != MotionEvent.ACTION_DOWN) 
    // return super.onTouchEvent(event); 
    Point point = new Point(); 
    point.x = event.getX(); 
    point.y = event.getY(); 
    points.add(point); 
    invalidate(); 
    Log.d(TAG, "point: " + point); 
    return true; 
} 
} 

class Point { 
float x, y; 

@Override 
public String toString() { 
    return x + ", " + y; 
} 
} 

Answer 1

我想你必須使用某種類型的插值和填補空白自己。如果它必須爲您的手指移過的每個像素髮送觸摸事件，它會徹底殺死系統。

Answer 2

有一個FingerPaint應用程序與API演示程序包捆綁在一起;你可以看看那個。這裏是link

Answer 3

我想設置抗鋸齒可以幫您參考這個： http://developer.android.com/reference/android/graphics/Paint.html#setAntiAlias(boolean） http://en.wikipedia.org/wiki/Spatial_anti-aliasing