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list.go
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list.go
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package list
import (
"fmt"
"log"
"strings"
"github.com/go-spatial/tegola/container/singlelist"
"github.com/go-spatial/tegola/maths"
)
type List struct {
list.List
}
// ForEachIdx is the same as the one in singlelist except it takes ElementerPointers
func (l *List) ForEachIdx(fn func(int, ElementerPointer) bool) {
l.List.ForEachIdx(func(idx int, e list.Elementer) bool {
el, ok := e.(ElementerPointer)
if !ok {
return true
}
return fn(idx, el)
})
}
// ForEachIdx is the same as the one in singlelist except it takes ElementerPointers
func (l *List) ForEach(fn func(ElementerPointer) bool) {
l.List.ForEach(func(e list.Elementer) bool {
el, ok := e.(ElementerPointer)
if !ok {
return true
}
return fn(el)
})
}
// ForEachPt will iterate forward through the list. The fn will be called for each pt.
// If fn returns false, the iteration will stop.
func (l *List) ForEachPt(fn func(int, maths.Pt) bool) {
l.ForEachIdx(func(idx int, pt ElementerPointer) bool {
return fn(idx, pt.Point())
})
}
// ForEachPtBetween will iterate forward through the list. Starting from the start point to the end point calling the fn.
func (l *List) ForEachPtBetween(start, end ElementerPointer, fn func(int, maths.Pt) bool) {
count := 0
l.FindElementsBetween(start, end, func(e list.Elementer) bool {
pt, ok := e.(maths.Pointer)
count++
if !ok {
// skip elements in the list that are not pointers.
return false
}
return !fn(count-1, pt.Point())
})
}
// PushInBetween will Push the element pointer between the start and end points
func (l *List) PushInBetween(start, end ElementerPointer, element ElementerPointer) (r bool) {
spt := start.Point().Truncate()
ept := end.Point().Truncate()
var mark ElementerPointer
defer func() {
if r && element.Next() == nil {
log.Println("nil!")
log.Printf("\tstart: %v[%[1]p] %v[%[2]p]", start, start.Next())
log.Printf("\t pt: %v[%[1]p] %v[%[2]p]", element, element.Next())
log.Printf("\t end: %v[%[1]p] %v[%[2]p]", end, end.Next())
//log.Printf("\t mark: %v[%[1]p] %v[%[2]p]", mark, mark.Next())
log.Printf("\t mark: %v[%[1]p] ]", mark)
panic("Stop!")
}
}()
mpt := element.Point().Truncate()
{
line := maths.Line{spt, ept}
// Make sure the point is in between the starting and ending point.
if !line.InBetween(mpt) {
return false
}
}
// Need to figure out if points are increasing or decreasing in the x direction.
deltaX := ept.X - spt.X
deltaY := ept.Y - spt.Y
xIncreasing := deltaX > 0
yIncreasing := deltaY > 0
// fmt.Printf("// start: mpt,ept %f,%f,%f,%f,%v\n", mpt.X, ept.X, mpt.Y, ept.Y, mpt.X == ept.X && mpt.Y == ept.Y)
// If it's equal to the end point, we will push it before the end point
if ept.IsEqual(mpt) {
l.InsertBefore(element, end)
return true
}
// If it's equal to the start point we need to push it after the start.
if spt.IsEqual(mpt) {
l.InsertAfter(element, start)
return true
}
fmark := l.FindElementsBetween(start, end, func(e list.Elementer) bool {
var goodX, goodY = true, true
if ele, ok := e.(maths.Pointer); ok {
pt := ele.Point()
// There is not change in X when deltaX == 0; so it's always good.
if deltaX != 0 {
if xIncreasing {
goodX = int64(mpt.X) <= int64(pt.X)
} else {
goodX = int64(mpt.X) >= int64(pt.X)
}
}
// There is no change in Y when deltaY == 0; so it's always good.
if deltaY != 0 {
if yIncreasing {
goodY = int64(mpt.Y) <= int64(pt.Y)
} else {
goodY = int64(mpt.Y) >= int64(pt.Y)
}
}
return goodX && goodY
}
return false
})
mark, _ = fmark.(ElementerPointer)
// This should not happen?
if mark == nil {
l.InsertBefore(element, end)
return true
}
l.InsertBefore(element, mark)
return true
}
func (l *List) GoString() string {
if l == nil || l.Len() == 0 {
return "List{}"
}
strs := []string{"List{"}
l.ForEach(func(pt ElementerPointer) bool {
strs = append(strs, fmt.Sprintf("%v(%p:%[2]T)", pt.Point(), pt))
return true
})
strs = append(strs, "}")
return strings.Join(strs, "")
}
func New() *List {
return &List{
List: *list.New(),
}
}