ActionScript 2.0 :: Using Hittest For A More Irregular Object Than A Circle?
Dec 15, 2004
ive recently made a game in which you have to avoid some big evil round planets. i found out the in the making of that that using the function hittest uses square objects. i dident bother much then with it, i just brought out the ol'e algebra book and looked up the distance formual and made my own hittest. now my questyion is is there a more refined way of using hittest for a more irregular object than a circle.
I made somewhat irregualr objects have hittest boxxes so that it was split up into many smaller parts, this gets kinda tedious if its really irregualr or if i need to move it around on the screen btw if anyone wants ta c the game i made [URL] avoid everyting , and shop at the store on the planet , u can go over the big planet in lower left corner but not the ones in orbit a few bugs still like only way to restart is the reload button in browser
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Jan 15, 2010
In my app, a user must drag and release a rectangular mc object (rectx) over an irregular shape within another mc object (irregx). There are 13 rect/irreg pairs. Each obj shares an AS2 file that checks whether rectx is over irregx, and proceeds _only_ if the check is true. The script uses hitTest, on mouse release, to grab the number (x) of the rectx being dragged and checks whether it's over irregx. Right now, the check comes back true when rectx is _anywhere_ inside irregx's bounding box whether it's over the actual image or not.
I've noticed that, when the (unpressed) mouse rolls over any irregx, it's oblivious to irregx's rectangular bounding box. It only reacts when it reaches the edge of the irregular shape inside, toggling from arrow to hand at the image edges. Since the mouse knows where the irregx image boundary is, is there a simple way to tap the mouse's 'eyesight' to verify whether rectx is over the correct irregx shape (meaning not just within the bounding box, within the shape inside it)? This can't be that hard.
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Oct 1, 2009
I have a circle: Width 530 and height 800. I want an object to follow this circle using a motion path, but you cant do that in pure actionscript, so I tried rotating the circle with the object attached, but warping the circle at the same time... so width becomes 530 and height becomes 800... but because the circle has rotated at the same time, it looks like it hasn't moved - except for the object attached.
ActionScript Code:
import fl.transitions.Tween;
import fl.transitions.easing.*;
import fl.transitions.TweenEvent;
var Tween1:Tween = new Tween(circle,"width",None.easeNone,800,530,2,true);
var Tween2:Tween = new Tween(circle,"height",None.easeNone,530,800,2,true);
var myTween:Tween = new Tween(circle,"rotation",None.easeNone,0,180,2,true);
This was the closest... but it still dances around the page before anything happens.... and it isn't reading the sizes properly? 530 isn't 530, but something bigger, and 800 is actually smaller?
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May 7, 2005
i hav made me a circle and then made it an mc. But when i make it an MCand click a square appears around it. So when i play the game it doesnt do a precise hitTest, instead it hits around the circle, where the square appears when i click it in the editor...how do i stop it from hitTesting the square around my circle, and instead when it actually hits the CIRCLE?
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Jan 7, 2009
ok so if i have an obect called square1 and an object called square2 and inside square2 i have hitArea... i want to use shapeflag to detect an absolute true hitTest on just the area of square1 not the bounding box.... i tried this code and it didnt work...
actionscript 2.0
ActionScript Code:
if (_root.square1.hitTest(square2.hitArea._x, square2.hitArea._y, true)) {
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Mar 15, 2011
I have a function that checks if 2 objects are touching OB1 and OB2, if they do touch it runs the rest of the collision code where OB1 is the character and OB2 is a tile that the player cannot pass through.
I came across an issue where i wanted sprites to be separate from the hitboxes but my collision code works by checking the height and width of an object (you guys know the drill).
So i have a Tile class with 2 parts to it, a bitmap and a movieClip.
So i have this setup(pseudocode):
Code:
loop
{
function collision (ob1 , ob2[loop].movieclip)
}
This should work right? But it ONLY works for the first object in the loop!
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Apr 6, 2011
I am working on an application where an image serves as cursor. Now i would like to know at any time over which object the cursor is hovering. Sort of like a HitTestObject(*) where i can then see what object the * represents. how i could accomplish this? (and using the mouse is not an option)
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Feb 27, 2012
I would like to know if there's the way to do collision check on every object on the stage,
[Code]...
I want to make the object such that it falls on a rotated platform and land according to it's angle. I've success fully make it landed according to it's angle before it lands. but the problem here is that, after the landing when I trigger the rotating platform, the object falls when the platform is out of it's hit area. Is there a way such that it will work like a car wiper and wipe the object towards it's direction?
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Jul 10, 2010
I'm coding a really simple 2D platforming game in Flash using AS3. I'd like to define two different types of terrain surfaces that the player can walk on based on classic platforming elements. Type1: the player can walk on, and if the player jumps, they will hit their head on it and bounce back to the ground. Type2: the player can also walk on, but if the player jumps and hits their head, they will simply pass through the surface and not bounce back to the ground.
I am using hitTestPoint to resolve collisions for this. My question is: What would be the best method to test for what TYPE of ground I am colliding with? Each ground type has it's own Class associated with it in my Flash IDE and all the different terrain surface types are in the same movie clip on the stage.
Currently I'm testing to see if it hit one type of ground surface, then i'm testing if it hit the other, and then based on those results, I process what I want to happen. This seems to work okay right now, but I'm imagining that I may want to create more than 2 types of ground to collide with. For example, moving platforms. It seems like the code will start to get complex
Eg.
if(_groundType1.hitTestPoint(_player.x, _player.y, true))
{
if(_groundType2.hitTestPoint(_player.x, _player.y, true))
[Code].....
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Aug 23, 2011
I have converted a PNG into a bitmap, then converted that into bitmapData.
I have a object called _player, and I wish to add collision detection, however I can seem to get it to work.
my code is:
if(bmd1.hitTest(new Point(_player.x, _player.y))){
trace("hit");
}
bmd1 is my bitmapData,_player is the object is wish to test against.
I am getting the following error:
1136: Incorrect number of arguments, Expected 3
I have looked around but cannott find what argument I am missing
I have tried
if(bmd1.hitTest(new Point(_player.x, _player.y), 50, _player)){
trace("hit");
}
I should mention that the reason for me taking this approach is that I have a PNG, with transparent areas, I need to test for collisions in the non-transparent areas, which is why I was using this approach
I have a PNG, i import that and convert to bitmap, then convert to bitmapData
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May 26, 2010
My Question is how i deduct the position of the hitTest Objecti mean to say which angle he hit X Y and after hiting it must be goo that angle
here is my code
import mx.transitions.Tween;
import mx.transitions.easing.*;
[code]......
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Jul 19, 2010
Is there a way that only allow hittest of a mc to hit one objects, if it hit multiple object it ignore it?
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Apr 14, 2004
Does anybody know how to make an object moving in a smooth circle?
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May 7, 2011
Essentially what the project consists of is I have random balls appearing on the screen and moving around and I need to make it so that the user is able to draw a circle around the ball (may be more than one) and have that balls dissapear and count the number of balls circled.This project is being done in flash builder 4.5 and is being made for the android platform as part of a senior project.I have been able to randomly create the balls and give them a random movement. I have also been able to figure out how to allow the user to draw on the screen.
What I am trying to figure out is how to make it so that if the user draws a circle around the balls make it so that I know these balls have been circled and make them dissapear and have the number of balls inside the area calculated.I have thought about making the entire background a grid and make it so that I can track somehow the line made by the user and then track the coordinate of the balls then if it is within that area it means that the ball has been circled but I would like something more efficient than that.
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May 28, 2010
I have a square object in the middle of circle.and i can move square object using up, down, left, riht arrow keys. I need script for when square object touches circle, then it goes to back, I have use for this below code :
var myobjdim:Array=new Array;[code].....
In above code "myobjdim" is square object and "bg1" is circle object..
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May 7, 2011
Essentially what the project consists of is I have random balls appearing on the screen and moving around and I need to make it so that the user is able to draw a circle around the ball (may be more than one) and have that balls dissapear and count the number of balls circled. This project is being done in flash builder 4.5 and is being made for the android platform as part of a senior project.
At this point this is where I am.. I have been able to randomly create the balls and give them a random movement. I have also been able to figure out how to allow the user to draw on the screen. What I am trying to figure out is how to make it so that if the user draws a circle around the balls make it so that I know these balls have been circled and make them dissapear and have the number of balls inside the area calculated.
I have thought about making the entire background a grid and make it so that I can track somehow the line made by the user and then track the coordinate of the balls then if it is within that area it means that the ball has been circled but I would like something more efficient than that.
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Apr 24, 2010
I have a circle drawn on the screen, wherein I add a moving object. I want it to keep inside. My strategy is to calculate the circle's radius and compare it with the distance the moving object is off its center. I beleive it's the proper solution. However, I'm having a problem with letting Flash know when the running guy should stop, so he doesn't leave the circle and ruin all the fun. Here's the code I'm using (it's not working of course):
function moveTheCreaturesRightwards(event:Event)
{
if(maleMovingRight == true)
{
[Code]....
The line: rayMale.width = maleRadius.width; was added when nothing else had seemed to be working
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Oct 21, 2010
What I'm doing is taking an image and "folding" it into a cylinder. I am then placing smaller images at certain points in front of that image. The large image isn't big enough to make a decent-sized cylinder, so I had to use it twice, which is fine. So now I need to create doubles of every small image that goes in and place them at opposite points (from the top perspective) in the cylinder.
Here's my problem: I want my inputs to be a simply x and y representing where the object would be if it were overtop of the flat large image. I take those inputs and (attempt) to convert the x coordinate into an angle, with which I can calculate the object's x and z position, as well as its y-rotation. However, my input range seems to be much more limited than it should be. The problem seems to lie in my angle calculation, since the others are pretty standard. Here's what I'm using right now:
[Code]...
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May 7, 2011
Essentially what the project consists of is I have random balls appearing on the screen and moving around and I need to make it so that the user is able to draw a circle around the ball (may be more than one) and have that balls dissapear and count the number of balls circled.
This project is being done in flash builder 4.5 and is being made for the android platform as part of a senior project.
At this point this is where I am.. I have been able to randomly create the balls and give them a random movement. I have also been able to figure out how to allow the user to draw on the screen.
What I am trying to figure out is how to make it so that if the user draws a circle around the balls make it so that I know these balls have been circled and make them dissapear and have the number of balls inside the area calculated.
I have thought about making the entire background a grid and make it so that I can track somehow the line made by the user and then track the coordinate of the balls then if it is within that area it means that the ball has been circled but I would like something more efficient than that.
I apologize if it is unclear for what I am looking for but a simple description is I am making a simple game where you are able to circle a moving item on screen, then once it is circled the item disappearsand you gain a point.
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Aug 7, 2003
i use this to make an object spin in a circle
onClipEvent (load) {
this._rotation = 10;
_x = 260;
[Code].....
Now what i need to know is how can i make a sentence for example "welcome to blah blah blah blah" go around in a circle i already try using Dynamic text and wrap the word but only thing i get is the whole sentence just going around with out going around following each other.
how to make an object spin in an 360 degree sorta like sureshot's site.
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Nov 15, 2009
Can an object that is tweening via TweeLite perform a hittest on another object?? I've looked in the documentation but can't find the answer.
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Apr 6, 2010
I was using hitTest to see when sunny (mc) would hit one of five objects I have in an array. But I had to use removeEventListener otherwise it would keep occurring. But now I can't "hit" the next object. Why doesn't the addeventListener work again?
stage.addEventListener(MouseEvent.CLICK, myClickReaction);
// speeds ALONG NYPOTENUSEvar v:Number=5;
var varObject:String;
var i:Number;
var arrayObjects:Array;
[Code] .....
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Jul 7, 2011
I am trying to make the instance 'red' be removed when all 3 objects have hit it here is my code:
var hit = 0;
addEventListener(Event.ENTER_FRAME, hittest);
function hittest(e:Event){
addChild(blue);addChild(green);
addChild(pink);
addChild(red);
[Code] .....
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Dec 5, 2009
adding multiple childs to an array these childs are added using timer after a time interval.actually there two classes and child of both classes are added to stage one through timer as i described and other through keyboard event. now is it possible to do this if yes than how?? and is it possible to apply hittest object between these two array.
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Dec 17, 2009
My first post in Actionscript.org. but I'm a long time visitor / fan. I'm moving a object with mouse but using some easing values. means it will follow the mouse slower.
Here is the file.[URL].. How can i check hitTest in this situation. even if i do it normally...the object is passing the collision object simply before stopping..because its being moved with mouse..
[Code]...
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Jun 16, 2004
I'm having troubles activating the HitTest, passing the objects name as a parameter through a global function. Let's say there is the following function on the main timeline:
Code:
_global.fallIntoBasket = function (fallingObject) {
if (_root[fallingObject].hitTest(_x, _root.basket_mc._y+(_root.basket_mc._height/2)-7, true)) {
trace ("teste");
_root[fallingObject]._alpha=0;
}}
I then call this function passing the this._name of the object as a parameter in a onClipEvent (EnterFrame) on each of the falling Objects action box. The whole detection thing doesn't work though... but if I place the hitTest code on each of the object, and change the _root[fallingObject] to this it works. Can I not pass hitTest through a function?
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Aug 2, 2011
I have an object called point that I can move around the screen with my mouse. This object has a vector mapped through it (_v1) using the center of the stage and "point"s x,y location in order to draw the vector (note all of this is working fine). My problem is occurring when I set up was a button that simply sets a value to true if you press it. The idea behind this button is that when pressed, whatever location "point" is at, it will move 1 degree clockwise in a circle around the center of the stage (this is all happening in the frameHandler so I can keep clicking the button to make it continue around the stage).
The code I am using is based in an if statement listed below:
if(clockwisePressed) {
var v1angle:Number = _v1.angle;
v1angle++; //increase the angle by 1 degree
if(v1angle>180) {
v1angle -= 360; }
[Code] .....
So what is happening here is that clockwisePressed has been set to true so this fires off. My vector (_v1) is set up to tell me the angle (already converted from radians to degrees) but it's a read-only value. So I assign it (_v1.angle) to v1angle so I can mess with it and increase it by 1 so I'm moving clockwise around the center of the stage. Then I just check to make sure that it falls into a range between -180 and 180 (if I trace _v1.angle around the stage, 0 degrees is to the left, 90 degrees is straight up, 180 degrees is to the right, and -90 is straight down). Now using the formula I derived from this thread but converted to work with 0 degrees pointing to the left and the value for Y going up the further down the stage you go, I came up with
x = centerX - radius * cos(angle)
y = centerY - radius * sin(angle)
Now when I make a sample chart on paper and use these values on my calculator, this works like a charm. If I plug in an angle, the radius, and center I get a point right on my circle I draw on a sheet of graph paper. However, when I actually try this in flash, the "point" jumps all over the stage. (Note that _v1.m is just the magnitude of the vector between the center of the stage and "point" which is the same as the radius). So I trace everything and the values for cos and sin don't seem to be coming out right. For example, if my angle is -1.9581 and I take the cos of that on my calculator I get something along the lines of 0.9994 but flash traces Math.cos(angle) to be -0.3777. Isn't using Math.cos(-1.9581) the same as putting -1.9581 into your calculator and hitting cos?
Below is the corrected code that works:
if(clockwisePressed) {
var v1RadAngle:Number = Math.atan2(_v1.vy, _v1.vx); //get angle in radians
v1RadAngle += 0.0174; //increase the angle by ~1 degree more or less
//Now just move the crosshair and get it ready to be redrawn
point.x = centerX - _v1.m * Math.cos(v1RadAngle); //_v1.m = radius
point.y = centerY - _v1.m * Math.sin(v1RadAngle);
clockwisePressed = false; //remove button pressed boolean
}
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Oct 9, 2010
In AS3 is there an easy way for collisions to take place between a moving circle and a rectangle object. A moving circle has a direction and you need to know how it collides with an object rather than knowing it just hits. In .net you use a points test where you test several points around a circle to see what hits an object and then you can work out what direction it will bounce off.
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Apr 4, 2010
If I removeChild an object from the stage can it still be detected by a hittest? I have objects that are tweening off the stage and if they hit other objects they stop their tween i use removeChild to remove objects that I don't want a hittest to occur on which is the nature of my question.
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Oct 14, 2011
I've attached a zip with a few custom classes and a .FLA. Ignore the custom classes. I'm getting repeated
"Error #1009: Cannot access a property or method of a null object reference. at Environment_fla::MainTimeline/hitTest()".
I understand that this error means I'm asking it to reference something that's no longer there. How better to hitTest many objects in an array. My game involves creating a bunch of balls that will fall into buckets. I need to keep track of how many touched the buckets, how many fell off the screen, and remove each accordingly.
Here is the code from my main FLA
ActionScript Code:
var ballTimer:Timer = new Timer(200);
var changeTimer:Timer = new Timer(50000);
ballTimer.addEventListener(TimerEvent.TIMER, throwBall, false, 0, true);
ballTimer.start();
changeTimer.addEventListener(TimerEvent.TIMER, changeColor);
changeTimer.start();
[Code] .....
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