Qt+OpenGL做的蕾达显示程序，采用OpenGL的FBO和顶点、片段着色器特性实现了雷达余晖效果，PPI视图可以实现每秒渲染数十万点，不到3 cpu占用率。-Qt+OpenGL do Lleida display program, using the FBO and OpenGL vertex, fragment shader features to achieve a radar afterglow effect, PPI view can render hundreds of thous