Fig. 4-12 Left one base angle is 0，Right one base angle is 90.
fig 4-12 left side is the reference angle = 0, right is the reference angle = 90
Angle Range Limit: When it is selected, the text will be limited in the angle
range limit no matter how many characters are input.as shown in Fig. 4-13:
Fig. 4-13 Left one is click Angle Range limit，Right one is not On the right, there is no
check angle range limit。
Changsha SeaThinking Info. Tech. Co., Ltd.
Changsha SeaThinking Info. Tech. Co., Ltd.
Reverse Inverse text：Reverse the text.as shown in Fig:
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