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绘图仪是以矢量形式输出图形,它的优点在于图形线段的效果不受象素点阵分辨率的限制,这样我们可以考虑从绘图仪上硬拷贝屏幕图形.由于绘图仪和显示器是以不同原理方法产生图形,采取直接读取屏幕显示缓冲区的内容,重新组织点阵数据,类似于从打印机硬拷贝屏幕图形的方法显然是行不通的.屏幕上的图形显示是通过调用图形库函数(如Turbo C的图形库)或图形软件包完成的.而绘图仪输出图形是通过向绘图仪发送字符串形式的绘图命令实现的.如果在屏幕图形显示过程中,使用扩充的图形库函数完成图形功能的绘图仪命令,这样,屏幕上每完成一步图形显示操作,便在绘图仪上生成相应的图形,待整个图形显示完成后,就在绘图仪上生成屏幕图形.
Plotter is a vector format output graphics, its advantage is that the effect of the graphic line segment is not limited by pixel dot matrix resolution, so that we can consider hard-copy screen graphics from the plotter.Plotter and display are based on different principles and methods Generate graphics, directly read the contents of the screen display buffer, reorganize the lattice data, similar to the hard copy from the printer screen graphics method obviously does not work.Graphic graphics on the screen by calling the graphics library functions (such as Turbo C Of the graphics library) or graphics package to complete the plotter output graphics is sent to the plotter by the string form of the drawing command to achieve.If the screen graphics display process using the extended graphics library functions to complete the graphics function of the drawing Instrument order, so that every step of the screen to complete the graphical display operation, it will generate the corresponding graphics on the plotter, until the entire graphics display is completed, the screen on the plotter to generate graphics.