Optimization Gong type hatch: similar with Gong, will jump in null
place. As shown in Figure 3-9:
Optimized bow shaped filling: Be similar to bow shaped filling，It
will still skip to fill in the blank space of the object. As shown in Figure 3-9:
Fig.3-9 Optimization Gong type hatch Optimized bow shaped filling
Those five types of hatch can be switched over by clicking the button
with the mouse and can be set or modified conveniently and rapidly
according to the required effects.
Angle: the angle between the hatch line and the X axis. 3-10 45 。
Angle: the angle between the hatch line and the X axis. As shown in Figure
3-10, it is a hatching graph when the hatching angle is 45 degrees.
Angle: Refers to the angle between the filling line and the X axis. As shown in
Figure 3-10, it is a filling figure when the filling angle is 45 degrees.
47 / 217
    "