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range_trigger.go
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range_trigger.go
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package crosslink
import (
"math"
"unsafe"
)
// RangeTriggerNode is a node that belongs to a RangeTrigger
// each RangeTrigger has 2 RangeTriggerNode, one positive and one negative, represents 2 sides of a range
// it implements CLPosImp as CLNode does
type RangeTriggerNode struct {
CLNode
rangeX CLPosValType
rangeZ CLPosValType
oldRangeX CLPosValType
oldRangeZ CLPosValType
myTrigger *RangeTrigger
isPositive bool
}
var g_offsetRangeTriggerNode uintptr
func initOffsetRangeTriggerNode() {
dummy := (*RangeTriggerNode)(unsafe.Pointer(&g_offsetRangeTriggerNode))
g_offsetRangeTriggerNode = uintptr(unsafe.Pointer(&dummy.CLNode)) - uintptr(unsafe.Pointer(dummy))
}
// RangeTrigger is a representation of a trigger range
type RangeTrigger struct {
ownerEntNode *EntityListNode
upperBound *RangeTriggerNode
lowerBound *RangeTriggerNode
posX CLPosValType
posZ CLPosValType
oldX CLPosValType
oldZ CLPosValType
rangeID RangeIDValType
eventTp EventValType
}
// newRangeTriggerNode creates a new RangeTriggerNode
// isPositive means is upper bound, or the position value is bigger
// the given parameters rangeX, rangeZ should be greater than 0
func newRangeTriggerNode(rTrigger *RangeTrigger, isPositive bool, rangeX CLPosValType, rangeZ CLPosValType) *RangeTriggerNode {
var node = new(RangeTriggerNode)
node.isPositive = isPositive
node.myTrigger = rTrigger
if isPositive {
node.rangeX = rangeX
node.rangeZ = rangeZ
} else {
node.rangeX = -rangeX
node.rangeZ = -rangeZ
}
node.nodeType = CLNODE_TRIGGER
// now it's not in a proper cross linked list
return node
}
func (thisNode *RangeTriggerNode) initialShuffle(oldX CLPosValType, oldZ CLPosValType) {
// don't trigger anything
thisNode.oldRangeX = 0
thisNode.oldRangeZ = 0
shuffleXThenZ(thisNode, oldX, oldZ)
thisNode.oldRangeX = thisNode.rangeX
thisNode.oldRangeZ = thisNode.rangeZ
}
func (thisNode *RangeTriggerNode) x() CLPosValType {
return thisNode.myTrigger.x() + thisNode.rangeX
}
func (thisNode *RangeTriggerNode) z() CLPosValType {
return thisNode.myTrigger.z() + thisNode.rangeZ
}
func (thisNode *RangeTriggerNode) getEntityID() EntityIDValType {
return thisNode.myTrigger.ownerEntNode.aoiNode.entID
}
// this 2 methods overrides the methods of 'parent' CLNode
func (thisNode *RangeTriggerNode) crossedX(otherNode CLNodeImp, positiveCross bool, otherOldX CLPosValType, otherOldZ CLPosValType) {
if thisNode.getEntityID() == otherNode.getEntityID() {
return
}
wasInZRange := thisNode.myTrigger.wasInZRange(otherOldZ, Abs(thisNode.oldRangeZ))
if !wasInZRange {
return
}
isEnter := bool(thisNode.isPositive != positiveCross)
if isEnter {
if thisNode.myTrigger.isInXRange(otherNode.x(), Abs(thisNode.rangeX)) &&
thisNode.myTrigger.isInZRange(otherNode.z(), Abs(thisNode.rangeZ)) {
thisNode.myTrigger.triggerEnter(otherNode)
}
} else {
if thisNode.myTrigger.wasInXRange(otherOldX, Abs(thisNode.oldRangeX)) {
thisNode.myTrigger.triggerLeave(otherNode)
}
}
}
func (thisNode *RangeTriggerNode) crossedZ(otherNode CLNodeImp, positiveCross bool, otherOldX CLPosValType, otherOldZ CLPosValType) {
if thisNode.getEntityID() == otherNode.getEntityID() {
return
}
wasInXRange := thisNode.myTrigger.wasInXRange(otherOldX, Abs(thisNode.oldRangeX))
if !wasInXRange {
return
}
isEnter := bool(thisNode.isPositive != positiveCross)
if isEnter {
if thisNode.myTrigger.isInZRange(otherNode.z(), Abs(thisNode.rangeZ)) {
thisNode.myTrigger.triggerEnter(otherNode)
}
} else {
if thisNode.myTrigger.wasInXRange(otherOldX, Abs(thisNode.oldRangeX)) &&
thisNode.myTrigger.wasInZRange(otherOldZ, Abs(thisNode.oldRangeZ)) {
thisNode.myTrigger.triggerLeave(otherNode)
}
}
}
func (thisNode *RangeTriggerNode) setRange(rangeX CLPosValType, rangeZ CLPosValType) {
oldX, oldZ := thisNode.x(), thisNode.z()
thisNode.rangeX, thisNode.rangeZ = rangeX, rangeZ
shuffleXThenZ(thisNode, oldX, oldZ)
thisNode.oldRangeX, thisNode.oldRangeZ = thisNode.rangeX, thisNode.rangeZ
}
// newRangeTrigger is a method for creating new RangeTrigger
func newRangeTrigger(ownerNode *EntityListNode, rangeX CLPosValType, rangeZ CLPosValType, rangeID RangeIDValType, eventTp EventValType) *RangeTrigger {
var trigger = new(RangeTrigger)
trigger.ownerEntNode = ownerNode
trigger.upperBound = newRangeTriggerNode(trigger, true, rangeX, rangeZ)
trigger.lowerBound = newRangeTriggerNode(trigger, false, rangeX, rangeZ)
trigger.posX, trigger.posZ = ownerNode.x(), ownerNode.z()
trigger.oldX, trigger.oldZ = trigger.posX, trigger.posZ
trigger.rangeID = rangeID
trigger.eventTp = eventTp
return trigger
}
func (thisTrigger *RangeTrigger) x() CLPosValType {
return thisTrigger.posX
}
func (thisTrigger *RangeTrigger) z() CLPosValType {
return thisTrigger.posZ
}
func (thisTrigger *RangeTrigger) owner() CLNodeImp {
return thisTrigger.ownerEntNode
}
func (thisTrigger *RangeTrigger) isInXRange(x CLPosValType, rangeX CLPosValType) bool {
return (thisTrigger.posX-rangeX) < x && x <= (thisTrigger.posX+rangeX)
}
func (thisTrigger *RangeTrigger) isInZRange(z CLPosValType, rangeZ CLPosValType) bool {
return (thisTrigger.posZ-rangeZ) < z && z <= (thisTrigger.posZ+rangeZ)
}
func (thisTrigger *RangeTrigger) wasInXRange(x CLPosValType, rangeX CLPosValType) bool {
return (thisTrigger.oldX-rangeX) < x && x <= (thisTrigger.oldX+rangeX)
}
func (thisTrigger *RangeTrigger) wasInZRange(z CLPosValType, rangeZ CLPosValType) bool {
return (thisTrigger.oldZ-rangeZ) < z && z <= (thisTrigger.oldZ+rangeZ)
}
func (thisTrigger *RangeTrigger) triggerEnter(entering CLNodeImp) {
thisTrigger.ownerEntNode.aoiNode.onEntityEnterRange(entering.getEntityID(), thisTrigger.rangeID)
}
func (thisTrigger *RangeTrigger) triggerLeave(leaving CLNodeImp) {
thisTrigger.ownerEntNode.aoiNode.onEntityLeaveRange(leaving.getEntityID(), thisTrigger.rangeID)
}
func (thisTrigger *RangeTrigger) setRange(rangeX CLPosValType, rangeZ CLPosValType) {
rangeX = Max(rangeX, 0.00000001)
rangeZ = Max(rangeZ, 0.00000001)
thisTrigger.upperBound.setRange(rangeX, rangeZ)
thisTrigger.lowerBound.setRange(rangeX, rangeZ)
}
func (thisTrigger *RangeTrigger) insert() {
cursor := thisTrigger.ownerEntNode.pNextX
cursor.getCLNodePtr().insertBeforeX(&thisTrigger.lowerBound.CLNode)
cursor.getCLNodePtr().insertBeforeX(&thisTrigger.upperBound.CLNode)
cursor = thisTrigger.ownerEntNode.pNextZ
cursor.getCLNodePtr().insertBeforeZ(&thisTrigger.lowerBound.CLNode)
cursor.getCLNodePtr().insertBeforeZ(&thisTrigger.upperBound.CLNode)
thisTrigger.upperBound.initialShuffle(thisTrigger.upperBound.x(), thisTrigger.upperBound.z())
thisTrigger.lowerBound.initialShuffle(thisTrigger.lowerBound.x(), thisTrigger.lowerBound.z())
}
func (thisTrigger *RangeTrigger) removeMyself() {
thisTrigger.posZ = math.MaxFloat32
thisTrigger.shuffleZ()
thisTrigger.upperBound.removeFromRangeList()
thisTrigger.lowerBound.removeFromRangeList()
}
func (thisTrigger *RangeTrigger) moveCenterToPos(tgtX CLPosValType, tgtZ CLPosValType) {
thisTrigger.posX, thisTrigger.posZ = tgtX, tgtZ
thisTrigger.shuffleXThenZ()
}
func (thisTrigger *RangeTrigger) shuffleZ() {
shuffleZ(thisTrigger.upperBound, thisTrigger.oldX+thisTrigger.upperBound.rangeX, thisTrigger.oldZ+thisTrigger.upperBound.rangeZ)
shuffleZ(thisTrigger.lowerBound, thisTrigger.oldX+thisTrigger.lowerBound.rangeX, thisTrigger.oldZ+thisTrigger.lowerBound.rangeZ)
thisTrigger.oldZ = thisTrigger.posZ
}
func (thisTrigger *RangeTrigger) shuffleXThenZ() {
upOldX := thisTrigger.oldX + thisTrigger.upperBound.rangeX
upOldZ := thisTrigger.oldZ + thisTrigger.upperBound.rangeZ
loOldX := thisTrigger.oldX + thisTrigger.lowerBound.rangeX
loOldZ := thisTrigger.oldZ + thisTrigger.lowerBound.rangeZ
// let the range expand first then shrink
if thisTrigger.oldX < thisTrigger.posX {
shuffleX(thisTrigger.upperBound, upOldX, upOldZ)
shuffleX(thisTrigger.lowerBound, loOldX, loOldZ)
} else {
shuffleX(thisTrigger.lowerBound, loOldX, loOldZ)
shuffleX(thisTrigger.upperBound, upOldX, upOldZ)
}
if thisTrigger.oldZ < thisTrigger.posZ {
shuffleZ(thisTrigger.upperBound, upOldX, upOldZ)
shuffleZ(thisTrigger.lowerBound, loOldX, upOldZ)
} else {
shuffleZ(thisTrigger.lowerBound, loOldX, upOldZ)
shuffleZ(thisTrigger.upperBound, upOldX, upOldZ)
}
thisTrigger.oldX, thisTrigger.oldZ = thisTrigger.posX, thisTrigger.posZ
}