I'm a newbie of Cocos2d-x 3.2 Physic Engine (as Cocos2d-x said, this engine is base on Chipmuk).
I made a sample "Egg shooting" game of Popcap.
When detecting contact of 2 eggs, I met a problem, dynamic 'egg' seems sink to static 'egg' when contact event is throwed.
I set for eggs:
Mass: 10.f
PHYSICSSHAPE_MATERIAL_DEFAULT
applyImpulse about (0,900)
This is image:
Detect contact ball event
auto contactBallListener = EventListenerPhysicsContact::create();
contactBallListener->onContactBegin = CC_CALLBACK_1(IngameScene::onContactBallsBegin, this);
_eventDispatcher->addEventListenerWithSceneGraphPriority(contactBallListener, this);
.....
bool IngameScene::onContactBallsBegin(PhysicsContact& contact)
{
auto objA = contact.getShapeA()->getBody()->getNode();
auto objB = contact.getShapeB()->getBody()->getNode();
}
Physical Setup
if (group == BallGroupTarget) {
//Green ball
body->setCategoryBitmask(0xFFFFFFF0);
body->setContactTestBitmask(0x0000000F);
body->setCollisionBitmask(0xFFFFFFFF);
} else if (group == BallGroupShooting){
//Pink ball
body->setContactTestBitmask(0xFFFFFFFF);
body->setGravityEnable(false);
}
Can you help me to solve this problem?
Thanks a lot!
From www.cocos2d-x.org
When CategoryBitmask of one body and with ContactTestBitmask of another body with the result doesn't equal to zero, the contact event will be sent, otherwise the contact event won't be sent.
When CategoryBitmask of one body and with CollisionBitmask of another body with the result doesn't equal to zero, they will collied, overwise it won't.
You should notice that by default, CategoryBitmask value is 0xFFFFFFFF, ContactTestBitmask value is 0x00000000, and CollisionBitmask value is 0xFFFFFFFF, which means all bodies will collide with each other but without sending contact event by default.
Observe the above SECOND and third point what it says. Set the bits accordingly in your game.
to make a static body do
pinkBall->setDynamic(false); //No need to set gravity false here. Now pink ball becomes static with zero gravity effect
bool IngameScene::onContactBallsBegin(PhysicsContact& contact)
This method should return a bool. Yours doesn't return anything. Pretty sure the compiler complains about that. Not sure what C++ defaults to, it might even return garbage.
Return true if you want the bodies to collide, return false if they should pass through one another.
Related
So i've been trying to create a sentence-count function which will cycle through the following 'story':
let story = 'Last weekend, I took literally the most beautiful bike ride of my life. The route is called "The 9W to Nyack" and it actually stretches all the way from Riverside Park in Manhattan to South Nyack, New Jersey. It\'s really an adventure from beginning to end! It is a 48 mile loop and it basically took me an entire day. I stopped at Riverbank State Park to take some extremely artsy photos. It was a short stop, though, because I had a really long way left to go. After a quick photo op at the very popular Little Red Lighthouse, I began my trek across the George Washington Bridge into New Jersey. The GW is actually very long - 4,760 feet! I was already very tired by the time I got to the other side. An hour later, I reached Greenbrook Nature Sanctuary, an extremely beautiful park along the coast of the Hudson. Something that was very surprising to me was that near the end of the route you actually cross back into New York! At this point, you are very close to the end.';
And I realise the problem I'm having but I cannot find a way around this. Basically I want my code to return a the total sCount below but seeing as I've returned my sCount after my loop, it's only adding and returning the one count as a total:
const sentenceTotal = (word) => {
let sCount = 0;
if (word[word.length-1] === "." || word[word.length-1] === "!" || word[word.length-1] === "?") {
sCount += 1;
};
return sCount;
};
// console.log(sentenceTotal(story)) returns '1'.
I've tried multiple ways around this, such as returning sentenceTotal(word) instead of sCount but console.log will just log the function name.
I can make it return the correct sCount total if I remove the function element of it, but that's not what I want.
I don't see any loop or iterator which would go through story to count the number of occurrences of ., ?, or !.
Having recently tackled "counting sentences" myself I know it is a non-trivial problem with many edge cases.
For a simple use-case though you can use split and a regular expression;
story.split(/[?!.]/).length
So you could wrap that in your function like so:
const sentenceTotal = (word) => {
return word.split(/[?.!]/).length
};
let story = 'Last weekend, I took literally the most beautiful bike ride of my life. The route is called "The 9W to Nyack" and it actually stretches all the way from Riverside Park in Manhattan to South Nyack, New Jersey. It\'s really an adventure from beginning to end! It is a 48 mile loop and it basically took me an entire day. I stopped at Riverbank State Park to take some extremely artsy photos. It was a short stop, though, because I had a really long way left to go. After a quick photo op at the very popular Little Red Lighthouse, I began my trek across the George Washington Bridge into New Jersey. The GW is actually very long - 4,760 feet! I was already very tired by the time I got to the other side. An hour later, I reached Greenbrook Nature Sanctuary, an extremely beautiful park along the coast of the Hudson. Something that was very surprising to me was that near the end of the route you actually cross back into New York! At this point, you are very close to the end.';
sentenceTotal(story)
=> 13
There a several strange things about you question so I'll do it in 3 steps :
First step : The syntax.
What you wrote is the assignement to a const of an anonymous variable. So what it does is :
Create a const name 'sentenceCount'
To this const, assign the anonymous function (words) => {...}
Now you have this : sentenceCount(words){...}
And that's all. Because what you wrote : ()=>{} is not the calling of a function, but the declaration of an anonym function, you should read this : https://www.w3schools.com/js/js_function_definition.asp
If you want a global total, you must have a global total variable(not constant) so that the total isn't lost. So :
let sCount = 0; //<-- have sCount as a global variable not a const
function isEndOfSentence(word) {
if (word[word.length-1] === "." || word[word.length-1] === "!" || word[word.length-1] === "?") {
sCount += 1;
};
};
If you are forbidden from using a global variable (and it's best to not do so), then you have to register the total as a return of your function and store the total in the calling 'CountWords(sentence)' function.
function isEndOfSentence(words) {...}
callingFunction(){
//decalaration
let total;
//...inside your loop
total += isEndOfSentence(currentWord)
}
The algorithm
Can you provide more context as how you use you function ?
If your goal is to count the words until there is a delimiter to mark the end of a sentence, your function will not be of great usage .
As it is written, your function will only ever be able to return 0 or 1. As it does the following :
The function is called.
It create a var called sCount and set it to 0
It increment or not sCount
It return sCount so 1 or 0
It's basically a 'isEndOfSentence' function that would return a boolean. It's usage should be in an algorithm like :
// var totalSentence = 0
// for each word
// if(isEndOfSentence(word))
// totalSentence + totalSentence = 1
// endfor
Also this comes back to just counting the punctuation to count the number of sentence.
The quick and small solution
Also I tried specifically to keep the program in an algorithm explicit form since I guess that's what you're dealing with.
But I feel that you wanted to write something small and with as little characters as possible so for your information, there are faster way of doing this with a tool called regex and the native JS 'split(separator)' function of a string.
A regex is a description of a string that it can match to and when used can return those match. And it can be used in JS to split a string:
story.split(/[?!.]/) //<-- will return an array of the sentences of your story.
story.split(/[?!.]/).length //<-- will return the number of element of the array of the sentences of your story, so the sentence count
That does what you wanted but with one line of code. But If you want to be smart about you problem, remember that I said
Also this comes back to just counting the punctuation to count the number of sentence.
So we'll just do that right ?
story.match(/(\.\.\.)|[.?!]/g).length
Have fun here ;) : https://regexr.com/
I hope that helps you ! Good luck !
Playing around with custom composition spawning in Arma 3. I am currently using "LARs Composition Spawn Script" (https://forums.bistudio.com/forums/topic/191902-eden-composition-spawning/) to spawn a custom compostion. Spawning compositions around the map works like a charm.
In the composition there is one object (AI) whith varname "quest_giver". To this specific Object I want to add an Action. My current code is:
// SPAWN RANDOM COMPOSITION ON RANDOM POSITION
_spawned_composition = [ _random_composition, _pos, [0,0,0], random 360 ] call LARS_fnc_spawnComp;
// GET OBJECTS FROM THE SPAWNED COMP BACK (ARRAY)
_objects = [_spawned_composition] call LARs_fnc_getCompObjects;
// TRYING TO ITERATE THROUGH OBJECTS TO FIND "quest_giver"
// AND ADD ACTION TO IT.
{
_type = typeName _x;
if (_type == "GROUP") then {
_units = units _x;
{
_var = missionNamespace getVariable ["name", _x];
_name = typeOf _var;
if (_name == "quest_giver") then {
player globalChat format["%1",_name];
//_speak = _x addAction ["Speak", {hint format ["Hello, it works !"]}];
};
} forEach _units;
};
} forEach _objects;
Error at If(_name == "quest_giver") where _name is an OBJECT but "quest_giver" of course a STRING. So I get Error Generic error in expression.
However, _var = missionNamespace getVariable ["name",_x]; returns "quest_giver". But it as an OBJECT, since typeOf _var returns "OBJECT" not STRING.
I just can't figure out the most simpliest thing here I guess. Any idea, if this would even work in theory ?
What I am trying to achieve
Create various custom compositions, where on Object in it is always the "quest_giver". Works so far.
Choose random comp and spawn it on random position in the world. Works so far.
Add action to the quest giver so player can speak to him. Text Pop up with simple text, content would be a random quest ala bring me 5 x Water Bottles.
I know my way around before and after the add action part but can't figure out how to add action to this specific object. ...
unless I'm mistaken, you seem to be confused about how to get the unit's name?
it might be you want to get a name var from the unit's namespace (if the thing you're using does put it there):
_name = _x getVariable ["name" /*var name*/, "" /*default value*/];
if (_name == "quest_giver") then {
//...
or more likely (if it's about the name set via editor) with the name function:
if ((name _x) == "quest_giver") then {
SKAction has waiting for duration abilities, for a period of time on a node. And seems to perform actions on nodes. Like moveTo, etc.
If I don't want that, rather I'd prefer to call functions within GameScene after a period of time, how do I do that with SpriteKit in the GameScene, not on a Sprite or other Node?
Are SKActions the way to do this? The only way to do this?
Yes. This question IS that ridiculously simple. I lack the heuristics and terminology to find an answer. Just keep looping around on how SKAction waits are calls on SKSprites for things like scale, rotation, etc, after time. Which isn't want I want/need.
Update:
Desired outcome, inside GameScene
doSetupStuff() // does some stuff...
waitForAWhile() // somehow wait, perhaps do somethings in here, while waiting
doSomethingElse() // does this after the waitForAWhile has waited
UPDATE 2:
What I think happens, again, inside didMove(to view...)
func wait(){
let timeToPause = SKAction.wait(forDuration: 3)
run(timeToPause)
}
let wontwait = SKAction.wait(forDuration: 3)
run(wontwait)
thisFunction(willnot: WAIT"it starts immediately")
wait()
thisFunction(forcedToWait: "for wait()'s nested action to complete")
UPDATE 3:
Found a way to get the delay without using SKActions. It's a little crude and brutal, but makes more sense to me than SKActions, so far:
DispatchQueue.main.asyncAfter(deadline: .now() + 10.0) {
print("I waited ten seconds before printing this!")
}
An option, as you cited, is to manage this externally. The way I typically manage this sort of thing is to have an externally run update cycle. One that
To drive this updater, you could use either CADisplayLink (which is what I use right now with my OpenGL renderer) or a dispatch source timer (which I have used with my SpriteKit engine). When you use an updated, you want to calculate the delta time. The tick handler could look something like:
func tickHandler() {
let currTime = NSDate().timeIntervalSince1970
let dt = lastTime - currTime // lastTime is a data member of the class
// Call all updaters here, pretend "updater" is a known updater class
updater.update(dt)
}
And updater's update method would look something like:
func update(deltaTime:NSTimeInterval) {
// Do your magic
}
I typically have a main overall updater running independent of what people are calling scenes. Example usage would be something like having an attract mode like in old school arcade games. There they show title screen, sample game play, high scores, rinse and repeat. Scenes would be title, game play, high score. Here you can your main updater manage the time and coordinate the construction/destruction/switching of the scenes. Note this implies having an overall scene manager (which is actually quite handy to have).
For your case, you could use this updater to drive the GameScene updater. It's updater could look something like:
func update(deltaTime:NSTimeInterval) {
switch state {
case .SetupState:
// noop?
println("I'm in setup") // Shown just so you can see there is a setup state
case .WaitState:
waitTime += deltaTime
if waitTime >= kWaitTime {
// Do whats you gots to do
doSomethingElse()
state = .NextState
}
case .NextState:
// blah blah blah blah
}
}
So the flow to do this call path from your driver (CADisplayLink or dispatch source) would be something like:
tickHandler -> master updater -> game scene updater
Some will def find this is perhaps a little heavy handed. I, on the other hand, find this very helpful. While there is obviously some time management and the loss of being able to fire and forget, it can help provide more control for orchestrating pieces, as well as arbitrarily changing state without having to worry about killing already queued actions. There is also nothing that says you still cannot mix SKAction. When I did use SpriteKit, I did all my updating this way along with some dispatched items. I only used SKAction to update hierarchy. Keep in mind that I used my own animation and physics system. So at least for me I had a lot less dependency on SpriteKit (it effectively was just a renderer for me).
Note you have to have your own means to handle pause and coming to foreground where your timer will need to be resynced (you only need to worry about tickHandler). Breakpoints also will cause time jumps.
You can use below function
#define ANIM_TIME 2
SKAction *customACtion = [SKAction customActionWithDuration: ANIM_TIME actionBlock:^(SKNode *node, CGFloat elapsedTime) {
// Do Something Here
}];
Another way to make something happen after a certain period of time is to make use of the 'current time' parm passed to update(). The following code will spawn a boss at intervals ranging from 20 to 30 seconds.
In your property definitions:
var timeOfLastBoss: CFTimeInterval = -1 //Indicate no boss yet
var timePerBoss = CFTimeInterval()
.
.
.
didMoveToView() {
...
timePerBoss = CFTimeInterval(Int.random(20...30))
'''
}
.
.
.
func update(currentTime: CFTimeInterval) {
...
spawnBossForUpdate(currentTime)
...
}
'
'
'
func spawnBossForUpdate(currentTime : CFTimeInterval) {
if ( timeOfLastBoss == -1 ) {timeOfLastBoss = currentTime}
if (currentTime - timeOfLastBoss < timePerBoss) {return}
// Rest of 'spawnBoss code
self.timePerBoss = CFTimeInterval(Int.random(20...30))
self.timeOfLastBoss = currentTime
}
One way, using SKActions, in Swift 3.0, looks like this:
DEFINE: aPatientlyWaitingFunction() at the top level of
GameScene class.
To cause a delay to happen before calling the above function, inside
didMove(to view...)
three ways I've found to do this using Actions:
All three ways seem to accomplish the exact same thing:
let timeToWait: TimeInterval = 3 // is seconds in SKAction thinking time
let waitSomeTime = SKAction.wait(forDuration: timeToWait)
// 1st way __________________________________________
// with a completion handler, the function can be called after Action
run(waitSomeTime) {self.aPatientlyWaitingFunction()}
// 2nd way __________________________________________
// as a completion to be done after action, in the run invocation:
run(waitSomeTime, completion: aPatientlyWaitingFunction)
// 3rd way __________________________________________
// alternatively, as part of a sequence of actions...
// Create a sequence, by making a run action from waitSomeTime and...
let thenDoThis = SKAction.run(aPatientlyWaitingFunction)
// then activate sequence, which does one action, then the next
run(SKAction.sequence([waitSomeTime, thenDoThis]))
// OR... for something different ____________________
////////////////////////////////////////////////////////
DispatchQueue.main.asyncAfter(deadline: .now() + timeToWait) {
self.aPatientlyWaitingFunction()
print("DispatchQueue waited for 3 seconds")
}
first time here on stackoverflow and first time scripting in flashCS6.
ill get down to it - the only lang ive done is html and a bit of css. I tried learning java, but gave up since i realised im making flash games so might as well just do AS3. Its pretty similar and not at all at the same time.
As my first original program (i did a tutorial of pong from a website before, got to know a bit about functions and event handlers[http://as3gametuts.com/2011/03/19/pong-1/]), im trying to create a calculator, and what want to know is how i can return the values from two input fields, put them into a logic calculator (say input a is 1 and input b is 2, and there are four functions, each attached to an event listener for the 4 mathematical operations, and i press addition so the calculator goes 2+1=3)
main question here, how do i get the outut text field to display the answer. In java i just used system.out.println(inputA + inputB).
Here i tried to do out.text = ( a + b) (where out is output , a is input and b is input 2)
Here is the code i have so far:
a is input 1, b is input 2
Out is output
and mul, add, sub and div are symbols containing dynamic test fields with instance names adn, sub, mul and div respectively. The symbol instances are the same as the test instances) Ex: i have a text field that says addition, its instance name is adn, then i convert it to a symbol and make its instance name adn as well.
a.text.restrict = "0-9";
b.text.restrict = "0-9";
mul.addEventListener(MouseEvent.CLICK, output);
adn.addEventListener(MouseEvent.CLICK, addition);
sub.addEventListener(MouseEvent.CLICK, subtraction);
div.addEventListener(MouseEvent.CLICK, division);
a.addEventListener(TextInput,input);
b.addEventListener(TextInput,input);
function output ():void
{
out.text=("test to see if output works")
}
function input (e:TextInput)
{
}
function multiplication (e:MouseEvent)
{
}
function addition (e:MouseEvent)
{
}
function subtraction (e:MouseEvent)
{
}
function division (e:MouseEvent)
{
}
thanks guys, and cheers! Also, ill appreciate if anyone can link me to a good video or text tutorial (series) for AS3 introduction. My main focus is to be making PC games and not apps, so keep that in mind.
Check This Out
Also, don't forget to convert value to string, that may be neccessary:
out.text = String(a + b);
Since a text field will give you the input typecast as a string you will need to type cast them to type Number or type int before you can do any kind of math function on them.
And if you want to create a more complex calculator I would suggest you read up on the Math class
function subtraction (e:MouseEvent)
{
var result:Number = Number(a.text) - Number(b.text)
out.text = String(result)
}
Ok, so this is obviously going to be something that I stupidly overlooked in my code, but I am having problems with a boolean check in as3. In the below if statement I set a boolean, I can confirm that the boolean is set in this if switch as I have run a trace to check that:
if(switchA && switchB){
if(Side == "LEFT"){
localAttachCoords.x = (-Parent.collision.SideLength - entity.collision.SideLength)/2
localAttachCoords.y = Parent.collision.SideLength/2 - (((TargNode-1)*8) + entity.collision.SideLength/2)
}
if(Side == "RIGHT"){
localAttachCoords.x = (Parent.collision.SideLength + entity.collision.SideLength)/2
localAttachCoords.y = -(Parent.collision.SideLength/2 - (((TargNode-1)*8) + entity.collision.SideLength/2))
}
if(Side == "UP"){
localAttachCoords.y = (Parent.collision.SideLength + entity.collision.SideLength)/2
localAttachCoords.x = -(Parent.collision.SideLength/2 - (((TargNode-1)*8) + entity.collision.SideLength/2))
}
if(Side == "DOWN"){
localAttachCoords.y = (-Parent.collision.SideLength - entity.collision.SideLength)/2
localAttachCoords.x = Parent.collision.SideLength/2 - (((TargNode-1)*8) + entity.collision.SideLength/2)
}
entity.attached = true
entity.Parent = Parent
}
This would all be well and good, but for the fact that in a function from another class, executed every frame, claims that the boolean was set to false, I confirmed this with another trace function.
This is the function, taken from the class whose instance is referred to as entity in the above switch:
public function update(){
if (physics) physics.update()
if (node && physics){
trace(attached)
if(attached){
physics.nodeUpdate()
}
}
}
This function claims in the trace that attached == false despite it being set true earlier with no other reference to the attached variable. Any help would be appreciated!
Pathing
There are some un-addressed variables in your issue, foremost being the pathing you're taking to check your variable. This is relevant because of namespaces/scope affect what each piece of code has access to.
If your functions and variables shared the same space (i.e., global/document/timeline), then any reference the the same named variable will always return the same value, unless (as LoremIpsum noted) it's being shadowed by a local variable by the same name.
Obviously, this is not the case since you're using public function which is a class-only declaration. If the boolean you're looking for is on the timeline, and the class wants to read that variable, you need to have a valid path to it. Instantiated classes that are DisplayObjects and have been added to the DisplayList have both parent and stage properties which you can use to access the timeline global namespace (thereby providing access to your boolean).
However, if the class is not a DisplayObject (e.g., it does not extend a Sprite, Shape, or MovieClip), then access to the timeline has to be provided manually, either by setting a property on the class, or passing an argument to a method on the class.
Further complicating the matter is if the Boolean exists in another class object (either instantiated or static), you'd then need a way to get between them. A case of A sees B, C sees B, but neither A or C see eachother.
Values
A boolean is always going to be false, even if the assigned value was null, so if your class is trying to reference a variable that it can't see, that value will always be false. For example...
var foo:Boolean = this["fiddlesticks"];
trace("foo = " + foo); // traces: "foo = false"
There is no property this.fiddlesticks, so while the resolved value is null, foo becomes false. Consider using hasOwnProperty(), which indicates whether an object has a specified property defined, and is a method available to all objects.
Switch
You don't have to manually create your own switch using if then else if, AS3 has its own switch statement.
switch (Side) {
case "LEFT":
// Do stuff for left
break;
case "RIGHT":
// Do stuff for right
break;
case "UP":
// Throw your hands up
break;
case "DOWN":
// Get down and boogie!
break;
}
I hope that all helps. I'd like to say exactly what's going on with the access to your Boolean, but there simply isn't enough information to say.
Cheers!