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为了进一步完善林业专题图系统,实现常用专题图的快速显示,文章研究了位图数据在计算机的显示缓冲区中的组织结构。通过对显示缓冲区寄存器的正确控制,完成对位图数据的读写操作,读操作存贮该位图数据并形成磁盘数据文件;写操作将所形成的磁盘数据文件直接写入显示缓冲区,恢复屏幕图形。程序用 Microsoft C 5.0和 Microsoft 宏汇编5.0语言编写。运行结果表明,用专题图系统程序输出一幅复杂的专题图需20～30min,而用文章所述的方法恢复一幅相应的专题图不超过5s。
In order to further improve the forestry thematic map system and realize the rapid display of common thematic maps, this paper studies the organization of bitmap data in the computer display buffer. Through the right display buffer register control, the completion of the bitmap data read and write operations, the read operation to store the bitmap data and the formation of the disk data file; write operation to the formation of the disk data file directly into the display buffer, Restore screen graphics The program is written in Microsoft 5.0 and Microsoft Macro Assembler 5.0 languages. The results show that using the thematic map system program to output a complex thematic map takes 20 ~ 30min, and using the method described in the article to restore a thematic map does not exceed 5s.