逆时针而不是顺时针绘制弯曲的文本

Question

我想逆时针绘制弯曲的文本。到目前为止，我只做到了弯曲。

public class TextDrawActivity extends AppCompatActivity {
  @Override protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);   

    setContentView(new TextDrawingView(this));
  }   

  static class TextDrawingView extends View {
    private Path arc;
    private RectF bounds;
    private TextPaint textPaint;    

    public TextDrawingView(Context context) {
      super(context);   

      arc = new Path();
      bounds = new RectF();
      textPaint = new TextPaint();
      textPaint.setAntiAlias(true);
      textPaint.setTextSize(50);
      textPaint.setColor(Color.BLACK);
    }   

    @Override public void draw(Canvas canvas) {
      super.draw(canvas);   

      bounds.set(0f, 0f, getWidth() * 0.8f, getHeight() / 2.f);   

      arc.rewind(); // Clear internal structure.
      arc.addArc(bounds, 45, 360);
      canvas.drawTextOnPath("Lorem ipsum dolor sit amet, consectetur adipisicing elit.",
          arc, 0, textPaint.getTextSize() / 2.f, textPaint);
    }
  }
}

使用这段代码，它看起来像这样：

如何逆时针绘制文本，使其不再颠倒？

Answer 1

正如pskink在评论中回答的那样，负数sweepAngle可以用来达到这个效果：

@Override public void draw(final Canvas canvas) {
  super.draw(canvas);

  bounds.set(0f, 0f, getWidth() * 0.8f, getHeight() / 2.f);

  arc.rewind(); // Clear internal structure.
  arc.addArc(bounds, 135, -180);
  canvas.drawTextOnPath("Lorem ipsum dolor sit amet, consectetur adipisicing elit.", arc, 0, textPaint.getTextSize() / 2.f, textPaint);
}

逆时针而不是顺时针绘制弯曲的文本

Drawing curved text counter clock wise instead clock wise

android

android-custom-view