The example program purposely does not synchronize buffers by remembering what wasn't drawn to the current buffer — letting you see multiple buffers at work more clearly.
示例程序通过记住什么东西没有绘制到当前缓冲区来有意不让缓冲区同步—以便让您更清楚地了解同时工作的多个缓冲区。
The antenna does not synchronize scanning. The heading line is not stable. The echo position is changed accordingly.
天线与扫描不同步，船首线不定，物标位置也随之变化。
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