objective-c - 根据外部点对 CGPoints 数组进行排序

Question

我有一个 CGPoints 数组，想根据到外部点的最近距离对其进行排序。我已执行以下操作，但返回了错误的结果。

NSArray *sortedArray = [self.availableRenderPoints sortedArrayUsingComparator:^NSComparisonResult(NSValue *obj1, NSValue *obj2)
{
    CGPoint p1 = [obj1 CGPointValue];
    CGPoint p2 = [obj2 CGPointValue];

    CGFloat distance1 = ccpDistance(startPoint, p1);
    CGFloat distance2 = ccpDistance(startPoint, p2);

    if (distance1 <= distance2) return p1.y < p2.y;
    if (distance2 <= distance1) return p2.y < p1.y;

    return p1.x < p2.x;
}];

如何根据距起始点的最近距离对其进行排序？

Answer 1

不应该是这样吗

NSArray *sortedArray = [self.availableRenderPoints sortedArrayUsingComparator:^NSComparisonResult(NSValue *obj1, NSValue *obj2)
{
    CGPoint p1 = [obj1 CGPointValue];
    CGPoint p2 = [obj2 CGPointValue];

    CGFloat distance1 = ccpDistance(startPoint, p1);
    CGFloat distance2 = ccpDistance(startPoint, p2);

    if (distance1 < distance2) return NSOrderedAscending;
    if (distance2 < distance1) return NSOrderedDescending;

    return NSOrderedSame;
}];

？