第 二层为“图形对象”(Graphical Objects)，该层构件集合记为G。 第三层为“场景图与节点”(Scene Graph and Nodes)，该层的构件集合记为S。
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Some graphical objects 一些图形对象
Once a Canvas widget has been instantiated, several standard graphical objects (such as lines, circles, rectangles, and others) can be created on it. The following program demonstrates this.
一旦创建了画布部件实例，其上就可以创建一些标准的图形对象(例如，直线、圆形、长方形等)。
In the displaying modules, a displaying class consisting of two display link lists is designed to show graphical objects rapidly.
在内核的显示模块设计中，提出了一个包含两个显示链表的显示类结构，用以加快图形对象的显示速度。
Like controls, data objects on the screen, particularly graphical objects in drawing and modeling programs, can be manipulated by clicking and dragging.
显示屏上的数据对象，特别是画图和建模程序中的图形对象，像控件一样都能通过单击和拖动来操作。
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