android开发PathEffect问题处理

public class PathEffectView extends View {

  private Path line;
  private Paint linePaint;


  private Path range;
  private Paint rangePaint;
  private final Paint paint3;

  public PathEffectView(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);

    linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);

    linePaint.setStrokeWidth(10);
    linePaint.setColor(Color.BLACK);
    linePaint.setStyle(Paint.Style.STROKE);
    linePaint.setPathEffect(new CornerPathEffect(300));

    rangePaint = new Paint(linePaint);

    rangePaint.setColor(Color.BLUE);
    rangePaint.setStyle(Paint.Style.FILL);


    paint3 = new Paint(linePaint);
    paint3.setColor(Color.RED);

  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    line = new Path();
    range = new Path();

    line.moveTo(0,1000);
    line.rLineTo(200,-150);
    line.rLineTo(200,300);
    line.rLineTo(200,-350);
    line.rLineTo(200,320);
    line.rLineTo(200,-370);
    line.lineTo(w,800);


    range.addPath(line);
    range.lineTo(w,h);
    rangePaint.setPathEffect(null);
    range.lineTo(0,h);
    range.close();
  }

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.save();
    canvas.translate(0,-20);
    canvas.drawPath(line, linePaint);
    canvas.restore();


    canvas.drawPath(range, rangePaint);
    canvas.drawPath(range,paint3);
  }
}