August 2017
Intermediate to advanced
360 pages
8h 35m
Chinese
Content preview from 算法技术手册（原书第2 版）
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46
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第
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/**
使用共线性检查来确定左拐
*/
public static boolean isLeftTurn(IPoint p1, IPoint p2, IPoint p3) {
return (p2.getX() - p1.getX()) * (p3.getY() - p1.getY()) -
(p2.getY() - p1.getY()) * (p3.getX() - p1.getX()) > 0;
}
}
/**
排序类。按照和指定点的极角值降序排列
*/
class ReversePolarSorter implements Comparator<IPoint> {
/**
存储用于比较的指定点的
x
、
y
坐标
*/
final double baseX;
final double baseY;
/** ReversePolarSorter
将所有点和指定点比较
*/
public ReversePolarSorter(IPoint base) {
this.baseX = base.getX();
this.baseY = base.getY();
}
public int compare(IPoint one, IPoint two) {
if (one == two) { return 0; }
//
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