private void computePath(Rect bounds) {
        final float currentScale = mCurrentScale;
        final Path path = mPath;
        final RectF rect = mRect;
        final Matrix matrix = mMatrix;

        path.reset();
        int totalSize = Math.min(bounds.width(), bounds.height());

        float initial = mClosedStateSize;
        float currentSize = initial + ((float) totalSize - initial) * currentScale;

        float halfSize = currentSize / 2f;
        float inverseScale = 1f - currentScale;
        float cornerSize = halfSize * inverseScale;
        float[] corners = new float[]{halfSize, halfSize, halfSize, halfSize, halfSize, halfSize, cornerSize, cornerSize};
        rect.set(bounds.left, bounds.top, bounds.left + currentSize, bounds.top + currentSize);
        path.addRoundRect(rect, corners, Path.Direction.CCW);

        matrix.reset();
        matrix.postRotate(-45, bounds.left + halfSize, bounds.top + halfSize);
        matrix.postTranslate((bounds.width() - currentSize) / 2, 0);
        float hDiff = (bounds.bottom - currentSize - mExternalOffset) * inverseScale;
        matrix.postTranslate(0, hDiff);
        path.transform(matrix);
    }
The two colors that will be used for the seek thumb.

@param startColor Color used for the seek thumb
@param endColor   Color used for popup indicator
caprice/ui/src/main/java/net/qiujuer/genius/ui/drawable/BalloonMarkerDrawable.java