Figure 8 shows the upgraded GraphicsEnvironment class with member variables that store the starting and ending coordinates of the viewport as VSX, vsy and vex, vey.
图8显示了更新后的graphicsenvironment类，它具有几个成员变量，用来存储viewport的起点和终点坐标：vsx,vsy和vex, vey。
Figure 8 shows the upgraded GraphicsEnvironment class with member variables that store the starting and ending coordinates of the viewport as VSX, vsy and vex, vey.
图8显示了更新后的graphicsenvironment类，它具有几个成员变量，用来存储viewport的起点和终点坐标：vsx,vsy和vex, vey。
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