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实现钢铁雄心那样的可点击地图（二）
source link: http://gad.qq.com/article/detail/36371
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实现钢铁雄心那样的可点击地图（一）上回有提到单纯使用边界点与多边形关系判断是无法确定凹凸性的，但代码又舍不得删，怎么办呢？其实在上一篇的代码也有写到取i-1到i+1线段中的一些点，只要这些点不在多边形
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