以三个圆重叠来说，形状联合后没重叠部分和三个圆重叠部分被保留下来，只有两个圆重叠的区域被剪除镂空(图3)。

In three overlapping circles, three round shapes overlap after the joint and overlap are preserved, only two circles overlap area have been cut off hollow out (figure 3).

youdao

原有内容中与新图形重叠的部分会被保留，其它区域都变成透明的。

The existing canvas content is kept where both the new shape and existing canvas content overlap. Everything else is made transparent.

youdao

原有内容中与新图形不重叠的部分会被保留。

The existing content is kept where it doesn't overlap the new shape.

youdao