示例#1
0
文件: qtree.go 项目: jbeda/geom
func New(cfg Config, bounds geom.Rect) (me *Tree) {
	me = &Tree{
		cfg:         cfg,
		UpperBounds: bounds,
		Partition:   bounds.Min.Plus(bounds.Max).Times(0.5),
	}
	me.Bounds = geom.NilRect()
	return
}
示例#2
0
文件: qtree.go 项目: jbeda/geom
func (me *Tree) Remove(element Item) (removed bool) {
	dbg("removing %v", element)
	if Debug {
		println(element)
	}
	Indent++
	defer func() { Indent-- }()

	if !geom.RectsIntersect(me.UpperBounds, element.Bounds()) {
		dbg("out of bounds")
		return
	}

	defer func() {
		if removed {
			me.Count = 0
			me.Bounds = geom.NilRect()
			if me.BigElements != nil {
				me.Count += len(me.BigElements)
				for elem := range me.BigElements {
					me.Bounds.ExpandToContainRect(elem.Bounds())
				}
			}
			if me.Elements != nil {
				me.Count += len(me.Elements)
				for elem := range me.Elements {
					me.Bounds.ExpandToContainRect(elem.Bounds())
				}
			}
			if me.Subtrees[0] != nil {
				for _, t := range me.Subtrees {
					if t.Count != 0 {
						me.Count += t.Count
						me.Bounds.ExpandToContainRect(t.Bounds)
					}
				}
			}
		}
	}()

	dbg("BigElements: %v", me.BigElements)
	dbg("Elements: %v", me.Elements)

	if me.BigElements != nil {
		for elem := range me.BigElements {
			if element.Equals(elem) {
				delete(me.BigElements, elem)
				removed = true
			}
		}
	}
	if me.Elements != nil {
		for elem := range me.Elements {
			if element.Equals(elem) {
				delete(me.Elements, elem)
				removed = true
			}
		}
	}
	for _, t := range me.Subtrees {
		if t == nil {
			continue
		}
		if t.Remove(element) {
			removed = true
		}
	}

	return
}