基于无边界漫游的电子海图无级缩放研究

A realization of stepless zooming of electronic chart based on limitless navigation display

本文详细论述了通过单比例尺海图的矢量缩放和不同比例尺海图的自动切换,实现了一种能够使信息量随显示比例变化的逻辑无级缩放,并通过在内存中建立两个位图以及两者之间的联动更新机制,提高了显示的速度和效果。

A logical stepless zooming display is realized whose information contents can vary according to the change of display scale,through the combining of the single scale chart ‘s vector zooming and automatic switch of multi-scale charts.A mechanism of double bitmap in memory and their linkage update is proposed, and the speed and effect of chart display is improved.