提供所有可视对象通用的服务和属性，其中包括命中测试、坐标转换和边界框计算。
Provides services and properties that are common to all visual objects, including hit-testing, coordinate transformation, and bounding-box calculations.
如果禁用此选项，调整边界框，再次启用该选项，新的尺寸用于计算以后的比例。
When you disable this option, resize the bounding box, and enable the option again; the new dimensions are used thereafter to calculate the ratio.
获取文本对象的已计算出的边界框。
获取文本对象的已计算出的边界框。
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