Android 不规则弧

我正在使用同一个RectF绘制一个圆弧的多个线段，但是这些圆弧没有正确对齐。我尝试了所有的帽子选项，但它看起来从来都不是对称的

 private void initPaint(TypedArray a){

    segmentInactivePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    segmentInactivePaint.setColor(a.getColor(R.styleable.SegmentsCustomView_segmentBgColor, segmentBgColor));
    segmentInactivePaint.setStrokeWidth(30f);
    segmentInactivePaint.setStyle(Paint.Style.STROKE);

    segmentsBGPaint = new Paint(segmentInactivePaint);
    segmentsBGPaint.setAlpha(64);

    segmentActivePaint = new Paint(segmentInactivePaint);
    segmentActivePaint.setColor(a.getColor(R.styleable.SegmentsCustomView_segmentActiveColor,segmentActiveColor));

}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    if(getWidth()<getHeight()) {
        rectF.set(getLeft(), getTop(), getWidth() - getLeft(), getWidth() - getLeft());
    }else{
        rectF.set(getLeft(), getTop(), getHeight() - getTop(), getHeight() - getTop());

    }
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    position = 0;
    for(int i=0; i < segmentSizes.length; i++){
        canvas.drawArc(rectF,position-180,segmentSizes[i]-segmentGap,false,
                i != segmentActive ?
                            i < segmentActive ? segmentInactivePaint :  segmentsBGPaint
                        : segmentActivePaint);
        position+=segmentSizes[i];
    }

}

我的猜测是，Canvas.drawArc方法会创建一条部分路径，因此圆弧的插值始终不同于整圆的圆弧

---

如果能朝着正确的方向努力，我们将不胜感激

因此，我通过使用路径而不是画布的drawArc方法解决了这个问题。每当我绘制新线段时，通过倒带路径

 @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        position = 0;
        for(int i=0; i < segmentSizes.length; i++){
            if(i == segmentActive){
                tmpPaint = segmentActivePaint;
            }else if(i > segmentActive){
                tmpPaint = segmentsBGPaint;
            }else{
                tmpPaint = segmentInactivePaint;
            }

            path.rewind();
            path.addArc(rectF,position - 180, segmentSizes[i] - segmentGap);
            canvas.drawPath(path, tmpPaint);
            position+=segmentSizes[i];
        }
        path.reset();

    }

倒带似乎能够画出一个几乎完美的圆，而不考虑子弧的数量

drawArc方法的工作方式似乎与addArc非常相似，但是它会在每次调用时重置路径

 @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        position = 0;
        for(int i=0; i < segmentSizes.length; i++){
            if(i == segmentActive){
                tmpPaint = segmentActivePaint;
            }else if(i > segmentActive){
                tmpPaint = segmentsBGPaint;
            }else{
                tmpPaint = segmentInactivePaint;
            }

            path.rewind();
            path.addArc(rectF,position - 180, segmentSizes[i] - segmentGap);
            canvas.drawPath(path, tmpPaint);
            position+=segmentSizes[i];
        }
        path.reset();

    }