Hi there,
I'm making a game prototype, a “hero” which is controlled by the mouse when clicked. To visualize the player's velocity direction and the direction from hero to mouse, I have made two MovieClip classes: “Direction_mark” and “Direction_pointer”, respectively. They are NOT nested due to issues I've run into when dealing with the possibility.
When trying to make “pushing camera” (where the hero moves and the background is fixed until you reach a certain point near the stage limits and the environment starts to move), though, I had to make the “Directions” movie clips stay in the same position as the hero, even if this moves. So I simply wrote this (the event listener for the function is onEnterFrame):
//In the Direction_mark and Direction_pointer class:
//...
function update (e: Event){
//code...
this.x = Game.hero.x;
this.y = Game.hero.y;
//more code...
}
//...
But it doesn't work: I experience a certain “easing”, the “Directions” follow the hero in and elastic-like effect which is not desired at all.
Does somebody know why this happen, and how to solve it? This is the first time I experience this problem. Any help, advice or comment would be greatly appreciated.
Thank you very much in advance.
PD: Probably not relevant, but I'm using CDK to manage collisions. Maybe takes too much CPU and makes it work wrong?
Related
I´m programing a space ship side scroll in as3. The bottom of the stage are mountains and here comes the problem, when I try to detect the ship collision against the mountains..
Because the poor collision detection and the need of avoid large loops my idea is create an object that works as a collider itself detecting a collision and avoiding parse all the stage or more selective metod.
I place "by hand" in the flash stage several instances of circles with a class for manage them where I place the If(this.collider.hits(ship)....
I spent looong time but I can find the way to make it work some of the mistakes i get are like this
Error 1061: Call to a possibly undefined method hitTestObject through a reference with static type Class.
some Idea? Thanks in advance
when you hit test with points it is important that the point being tested is relative to the object being tested against, eg
if(mountain.hitTestPoint(this.x + circle1.x, this.y + circle1.y))
will return true if the circles are inside the object calling the function because their position relative to the mountain is now relative to it rather then relative to the ships xy position within the clip... hope that makes sense.
btw I have done this myself in the past but I would have to remind you that you can only hit test with the points so there is no need to have circles, use blank sprites instead and set the visible flag in the properties panel to false, no drawing will make it slightly faster... not that you will notice, also sprites/graphics use less memory then movie clips.
also I would recommend hard coding some points in the clips rather then actually adding the clips in the sprite/clip itself, this will make it easier to work with them and scale later on (believe me this will annoy the hair from your head to do something later and slow the game to scale on the fly)
try something like this... you can determine the points values by adding a clip to the movie clip and getting its position from the properties if you must.
private var hitPoints:Vector.<Point> = new Vector.<Point>
hitPoints.push(new Point(10, 40));
hitPoints.push(new Point(30, 40));
//...do this for all your points
//loop through all your points and check if the hit relative to the ships position.
for(var i:int = 0; i < hitPoints.length; i++)
{
if (scene.hitTestPoint(ship.x + hitPoints[i].x, ship.y + hitPoints[i].y))
{
//do your hit stuff here
break;//don't forget to break
}
}
in this code you will need to make sure the scene object is a reference to your scenery at the bottom of the screen.
I hope this helps but if this is not enough help then you should post some of your code here so we can have a look and see where it can be improved.
I'm making a little flash game and I want to implement invincibility frames, but I'm not exactly sure how to go about doing it. Essentially, when the player walks over an object, I want to remove a health (I know how to do this) and then have invincibility frames so that the player has time to move off of the object. Something along the lines of
if (player.hitTestObject(spikes)) {
//remove health
// INVINCIBILITY FRAMES
}
Any direction here would be helpful. Thanks!
You'd better give some details about your programming style, I mean is your programming style pure as3 or pure stage or using both as3 and stage.
I'm gonna answer your question assuming you're using pure as3 style.
If you want to make your hero invincible for everything instead of just that hitted spike, you should add a public method in your hero's ( or character's) class and a variable to keep track of how much time left to remove invincibility. Something like this
public function gotHit(){
invincibilityTimeLeft=500;//500 is miliseconds, which is a half second edit this as you wish.
isInvincible=true;
}
then in your game's Event.ENTER_FRAME loop, you should decrease your character's invincibilityTimeLeft according to passed time. When it reaches 0 or below again, you set isInvincible variable of your character as false. I hope you understand what I mean.
Best of lucks.
-Ozan
This question may get downvoted or go unanswered because it's not the greatest and incredible silly but anyway,
I'm taking an intro level Webanimation course this semester at UNI and had I know what their expectations are for our hand-in projects i would have never taken it up.
Basically the teacher taught us stuff to the extent of masking/tweening and very few mouse-event and basic function codes.
Now she is expecting us to make a god damn ENTIRE PIPE GAME. The one where there are a bunch of rotating pipes and you gotta rotate them in place before a timer runs out and then the water flows through them.
For this project I have to somehow figure out the following (even though she didn't teach any of this):
-creature a grid of rotate-able pipes (one mouse click I assume would do a 90 degree classic tween rotation of the object)
-creature some sort of logic hit-box value chain to make pipes decide when to fill with water (they fill with water (a.k.a turn blue inside as an animation) once they are connected to another water filled pipe, for example)
-creature multiple levels and a menu screen
-add a music track.
Now i know this site is for specific help only and you basically can't ask for help on an entire project, so for now if somebody could just help me out with the following:
How do I create a rotating pipe on mouseclick?
So I have my pipe movieclip created and I have my Mouse Event code ready but I don't have the faintest on how to make a tween within the pipe and connect it to the code so that it rotates on mouseclick.
So this far, let's say for one of the pipes, instance pipe_1, I want to do this:
pipe_1.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler);
function fl_MouseClickHandler(event:MouseEvent):void
{
trace("Mouse clicked");
}
I also have the simple tween of rotation already created within the instance of the pipe, but dunno how to connect it to code.
I'm supposed to figure out what to put inside the function but I honestly have no clue. Hours of googling have come up with nothing either except a 12 dollar purchasable source code for an even more complicated pipe game.
I hope somebody can at least help a bit, and thanks.
The way to rotate a clip is via it's rotation property. It defaults to 0.
If you were set the rotation property of your tile to 90, you'd rotate your pipe tile 90 degrees.
for example :
pipe_1.rotation += 90;
A tween is a means of changing a property of a given DisplayObject over time. So what you want to do is tween your rotation property 90 degrees over time.
Here is a tutorial on Tweening - http://www.republicofcode.com/tutorials/flash/as3tweenclass/
I think it'd be more beneficial for you to take the time to learn about it, than to have me just write a few lines of code to solve your problem.
StackOverflow is a place where you can ask a question, AFTER you have tried something and have hit an issue.
I have provided you with the basic concept of what you need to do, and if you take the time to learn about tweening, you'll be able to achieve your goal rather simply.
There are also tweening libraries such as TweenLite and TweenMax that simplify tweening. Not sure if your class will allow you to use them, but worthwhile to check out for your own benefit.
You can find TweenLite here :
http://www.greensock.com/tweenlite/
Are you talking about a frame by frame tween? or tweening with code?
for frame by frame tweening, you can try to do this:
pipe_1.addEventListener(MouseEvent.CLICK, f1_MouseClickHandler);
function f1_MouseClickHandler(e:MouseEvent) {
pipe_1.gotoAndPlay(2); //if the tween starts at frame 2
}
For code tweening, just call the tween function inside that handler function
I know this question has been asked before but as a noob i did not understand the answer so im hoping someone can explain a little more for me.
I have an arrow animated along a path using a motion tween I want when a button is clicked for an endless stream of arrows to follow the path, this would be easy if you could put more than one object on a motion tween but you cant? Can anyone help with the code id need to make this happen.
Is there a way to repeat the movieclip again before its finished to give this effect?
Do you have any code, or example of exactly what you're trying to accomplish?
You can use multiple instances of the same movie clip... So (for the sake of explanation) you could animate your arrow once, make sure it's its own movieClip, put it on the stage, and test your movie...It will loop over and over. You can drag as many instances of this movie on to the stage and they will all play, over and over until it's told to stop.
If you need ALL of the arrows to be one movie clip, as to be one addressable object, you can simply select all of your positioned arrows, and convert those into one movieClip (right click, convert to Symbol)
Of course all of this can be controlled precisely through code, but need to know a bit more about what you're trying to do. hope this helps a little...
The function play() will loop your movie forever, unless you have a stop() function somewhere.
yourMovie.play();
If you want to "repeat" / "reset" a MovieClip at any time, use gotoAndPlay() :
yourMovie.gotoAndPlay(1);
If you want to verify if you are at the end of your clip, use the properties currentFrame and totalFrames :
if (yourMovie.currentFrame == yourMovie.totalFrames)
{
// ex. if you want to stop
yourMovie.stop();
}
Ref : http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/MovieClip.html
Hope that help. Be more specific, if it doesn't answer your question.
So this one is a tricky one (for me) vital to the development of my project due to the fact that we can't directly modify the position of mouseX and mouseY - they are read-only variables.
Basically, what I want to do is have a player able to move their mouse only within a certain triangular area when a specific instance is active. The latter bit I can manage just fine, however I am having trouble restricting mouse movement -- or apparent mouse movement.
Here's what I have done so far:
1. Assign a library moveclip to the mouseX and mouseY position in the Event.ENTER_FRAME event - although I acknowledge that this should be moved to Mouse.MOUSE_MOVE. (this does not matter yet)
2. Using Corey O'Neils Collision detection kit, do a hit test on the border instances of the area with the crosshair/cursor.
3. Offset the cursor appropriately, and then set a standard Boolean value to false so that the cursor will not keep bouncing back into the cursor over and over.
My problem is, I am not sure what the best way is to go about allowing mouse movement again. Can anyone give me some tips on the best way to do this, or if necessary, point me in another direction where restricting mouse movement is a little easier?
For what it's worth, this is to stop users from aiming in an unrealistic direction with a character in a top-down (ish) shooter.
For those unfamiliar with Corey O'Neil's Collision Detection Kit, I believe it is just a pre-built setup of bitmap (or maybe vector) collision testing - I could be wrong. I'm not sure on the details of how it works, just its basic implementation.
Here is my code regarding mouse movement thus far:
import flash.ui.Mouse;
import flash.events.event
import com.coreyoneil.collision.CollisionList;
Mouse.hide();
var c:crosshair = new crosshair();
addchild(c);
var myCollisionList:CollisionList;
myCollisionList = new CollisionList(c); //sets up detection for the object c
myCollisionList.addItem(mcB); // adds mcB to the list of objects to check c's hittest with
function aim(e:Event) {
var collisions:Array = myCollisionList.checkCollisions();
if (collisions.length>0)
{
hashit = true; // tells the program that the mouse has collided with a boundary
c.x += 1;
c.y += 1;
}
else
{
if (hashit == false)
{
c.x = mouseX;
c.y = mouseY;
}
}
}
Apologies for the code block, but I figure it is best to show all relevant code -- I'm not sure about the complexity of this issue due to the read-only nature of the mouse's X and Y position.
Also, I'm looking for a possible solution which will not be clunky - that is, as soon as the mouse is back in the area, mouse movement will be smooth as it is originally, and where the cursor will still be matching the mouse position (meaning, the cursor is ALWAYS relevant to the mouse and will not change position should the mouse leave the boundaries).
Could anyone please give me some pointers? Sorry for the long question. I gather there might be a bit to get my head around here, being relatively new to AS3 - but I still feel this is a problem I can get past, if one of you can show me the right direction and help me with both the logic and programming side of things slightly.
Here is a diagram of my stage to clarify the boundary areas etc.
Thanks very much for any help in advance, I really do appreciate it!
Cheers, Harry.
How about trying getObjectsUnderPoint which returns an array of objects under a certain point.
If your triangle object is within the array the cursor must be above it.
var pt:Point = new Point(c.x, c.y);
var objects:Array = stage.getObjectsUnderPoint(pt);
if (objects.indexOf(triangleObject) > -1) {
trace("still within bounds");
}
The workaround here could be to hide the system mouse cursor and add a bespoke cursor movieclip to the stage.
Using a MOUSE_MOVE event listener attached to the stage, set the bespoke cursor movieclip to match the stage.mouseX and stage.mouseY values and also test whether the movieclip is outside your bounds. If so, set it back within your bounds.