ActionScript 3.0 :: How To Use BitmapData.hitTest
Jul 11, 2009
Im making a simple game with destructable terrain. Therefore i use a bitmap for the ground and a movieClip for the player. When the ground is a bitmap i cant use regular hitTestPoint because of the bitmaps transparent pixels. So i looking i the livedocs for the bitmapData.hitTest but i rly dont understand all the parameters.So my question is. How can i reproduce this with bitmapData.hitTest?
ActionScript Code:
if(ground.hitTestPoint(player.x, player.y, true)) {
//actions
[code]....
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Sep 1, 2011
how to use the bitmapData collision method. Now I'm trying to figure out if there is a way to see at what angle or coordinate of the bitmapData the collision happens? I need it in order to figure the accurate bounce angle after the collision occurs.
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Sep 23, 2009
import flash.display.BitmapData;
import flash.geom.Point;
//
var BitmapA:BitmapData = new BitmapData(550, 400, true, 0x00);
[code]....
This is using the bitmapdata.hittest way to check whether the one bitmap is overlapping the other. Throug pixel-to-pixel detection.But I'm having trouble understanding this line:
Code:
if (BitmapA.hitTest(destPoint, 255, BitmapB, currPoint, 255))
I know that destPoint is the topleft point from which it is determining all opaque pixels. No value is given to destPoint so basically it is checking from 0,0. Having determined all opaque pixels from that bitmap it should compare them with the opaque pixels of the other bitmap. But why does currPoint use the topleft coordinate of its movieclip? Couldn't it just as well use 0,0 too? I mean when determining the opaque pixels of bitmap two it might as well start checking for those from 0,0 as the topleft position as well?
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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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Jul 31, 2011
Having used copyPixels to display an image, I'm trying to copy another in it's place when the mouse is hovering.The only way I can copy the new image over the old is by setting the If statement to == false. I know there's something wrong with testing the bitmapData of the loaded .png because the hitTest would apply to anything copied from that tile sheet... but how to designate just the copied area?
ActionScript Code:
package
{
[code]......
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Oct 11, 2010
sometimes I get this extremely nasty bug:
Code:
ArgumentError: Error #2005: Parameter 0 is of the incorrect type. Should be type BitmapData.
[code]....
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Feb 22, 2012
sometimes I get this extremely nasty bug:
Code:
ArgumentError: Error #2005: Parameter 0 is of the incorrect type. Should be type BitmapData.
at flash.display::BitmapData/hitTest()
This is the line where I get this error:
Code: if (player.bitmapData.hitTest(player.point, 255, tempUpgrade.bitmapData, tempUpgrade.point, 255))
I have absolutely no idea what went wrong. My object (tempUpgrade) is generated inside of a manager-class. There I can define the look of it and it gets cached. The image I use is a spritesheet (png) that's embed inside of my library-class. The spritesheet is splitted into appropriate pics via a CacheTileSheet-class.After that process they get thrown inside of an array because I need the bitmapData for pixel-perfect collision detection. Of course this is not the complete code so if someone needs more please let me know.
[Code]...
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Aug 27, 2010
I have two png files. I import them using loaders. The images in the png files each have opaque (solid) and transparent parts. I want to use the bitmapdata.hittest method to detect when their opaque parts have collided.
[Code]...
I've been working on this for a couple of days now and nobody seems to know how to do this. Please don't post the examples on google, I've looked through at least the first five pages of results on google and haven't gotten any of them to work. The problem is that none of them provide an example of using this method with loaders, so I'm guessing the reason I can't get it to work is some gimmick associated with them.
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Feb 3, 2009
I'm cutting my teeth in actionscript 3 on a game that has a character running through a world. So, I have set up my Hit Testing by using the bitmap data hit test method, since I figured my world is going to be destructible - it'd be nice to update the level and then redraw it and have the character interact with the new change. (That works beautifully) I am however; a bit confused as to how I have my hit Testing set up. I've been messing around with it, and it works for now - but I'm not sure why.. currently, I have a character set up by using a class I built and using a series of animations I created. So, this character has a walking and falling animation, etc. This is a movie clip.
Then there's a bitmap 'emptyBitmap' with bitmap data created - however; I never really added this as a child to the character. This is sized to the dimensions of my character. My level is created as a movielip, then it's drawn to a bitmap - when the level movieclip is changed, the bitmap redraws, and that's how this updates.
[Code]....
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Jan 31, 2007
I'm using Flash 8, with this code in the first frame:
import flash.display.BitmapData;
rissa._x=Stage.width/2;
rissa._y=Stage.height/2;[code].....
When I publish the file, I'm getting the following error message in the Output panel:
**Error** Scene=Scene 1, layer=Layer 2, frame=1:Line 7: The class or interface 'BitmapData.loadBitmap' could not be loaded.
var plaid:BitmapData.loadBitmap("plaid");
Total ActionScript Errors: 1 Reported Errors: 1
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Oct 14, 2009
I am trying to use the reflect class from "http://pixelfumes.blogspot.com/2007/03/reflection-class-v3-with-source .html" but I keep getting this error:
ArgumentError: Error #2015: Invalid BitmapData.
at flash.display::BitmapData()
at Reflect()
at Site_fla::GalleryPage_29/loadThumbs()
at Site_fla::GalleryPage_29/sortXML()
[Code]...
btw, first I used assigned thumbContainer as the mc argument (outside the loadThumbs() function) and it worked but not exactly what I wanted... because I thought it is supposed to update when the movieclip is animated but it actually didn't... when I use a scroller, only the thumbs that are first loaded to the stage get the reflection..
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Dec 29, 2011
I've been using BitmapData.copyPixels() to draw graphics onto a canvas (Bitmap).I need to rotate the resulting graphics without the use of draw() because it's vastly slower.How can I rotate the target graphic? I'm assuming that there might be a formula or library that I can use which will first reorganize the pixels that make up a graphic based on an origin (point) and radians.I'm pretty certain that I'm not capable of creating such logic, so if there are any known libraries that do this, that would be awesome.I'd like to achieve something similar to XNA's SpriteBatch.Draw() method, which accepts rotation as its 5th argument.
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Jul 15, 2009
I'm currently working on a flash game and I need to know how to addChild a BitmapData or draw a BitmapData to screen. If I can't than how can I give a DisplayObject my BitmapData?
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Jan 15, 2009
i just would like to know how to create an "hitTest" script inside a movieclip that is actually part of that hitTest code?I mean... I have mc A, and mc B. and the current hitTest code im using (that is on the timeline) makes mc A, destroy mc B when collide with it... but there are many mc B on the stage (with the same instance name) so, when mc A collide with one mc B, it destroys ALL mc's B... but i want it to destroy only the mc B that he collides, not all the others... maybe an hitTest script inside a movieclip B would work (somethig like "if MC A hitTest ME = i die" (not all the others)).
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Dec 22, 2011
I've made a mobile version of my software, with low-res images and such, and I can now fully buffer all my content (including a 360 frame animation which is buffered to memory). Problem is, that everytime I update the view, more memory is used.When I write image = new BitmapData();, does it store the previously created BitmapData's in memory? Do I have to flush the memory somehow before I draw my second picture in BitmapData?Example:
ActionScript Code:
// In this example I draw using the same bitmapData several times, also
//overwriting the first image. Do I have to somehow delete the data first, to
[code].....
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Jan 9, 2012
I am having an issue with using BitmapData.draw(stage). I am getting the following error:
SecurityError: Error #2123: Security sandbox violation: BitmapData.draw: file:///C|/Documents%20and%20Settings/bla...bla...bla.swf cannot access null. No policy files granted access. Here is a portion of my code:
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Feb 8, 2010
i am controlling a tractor mc with right and left keyboard keys and let the user move the tractor till it reach a certain point where it touch a mc i want to go to a certain frame and stop the keyboard event listener and also the hit test listenerso finally the tractor is moved by user till it touches the mc then we will jump to a certain framethis certain frame will not have both of the tractor and the mcPHP Code:
import fl.transitions.Tween;
import fl.transitions.easing.*;
import flash.display.MovieClip;
[code].....
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Dec 29, 2009
The title might be a little misleading. Look at my code and I will explain
public static function loadTile(tileDir:String = "empty"):void
{
if(tileDir != "empty")
{
tPoint = new Point(0,0);
tRect = new Rectangle(0,0,30,30);
[Code]...
I am trying to do tiling with sprites. I want my tiles to be interactive, so that is why I am using the sprite object instead of using regular bitMaps to represent my tiles. You might be wondering why I wouldnt just use graphics.beginBitmapFill(tImage); and graphics.drawRect(0, 0,tWidth ,tHeight ); to pick out the tiles I want to use. Well reason being is because it turns out that drawRect() first and second parameters actually alter the location of where the actual sprite sits at.
So if I set the x and y properties of the sprite to x = 20, and y = 20. then I set my drawRect(20,20). it actually adds an extra 20 pixels to my x and y coords of my sprite. And I know the reason why, I just need to know a better way.
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May 14, 2009
I have a movie clip called frog who moves along the screen, I want him to jump when he hits any other movie clips. I can make him do so with the code below, the problem is that if I write the same function for the other movie clips it doesnt work, it still works on the first one but none others. I have tried attaching an onCilpEvent on both the frog and on all the other movie cilps so no avail.
function hitBaby(){
if(_root.babyWord.hitTest(_root.frog)){
_root.frog.gotoAndPlay("frogB");}else{ _root.frog.gotoAndPlay("frogA");}
[code]....
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Feb 25, 2009
i have this drag and drop thing basically when i drop the item on top of its slot i want it to do a hittest to set the depth to a number assigned to it. so lets say I drag an item called Item to a spot called slot i want it to do like item on hit test to slot set depth(2) lets say.
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Apr 7, 2010
i'm trying to build this simple game for school: you've got a catapult which launches a "bullet" and you will have to aim it to hit a certain point. Now the whole catapult part and shooting the "bullet" works, but now it has to respond when it hits something, and that's where i'm stuck.
[Code]...
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Aug 12, 2010
I'm trying to make a hitTest between to movie clips (Let's call them J and T)[code]But nothing happens when the two movie clips collide.
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Mar 17, 2011
I am trying to create a game. My game is birds eye view game and I am trying to get it so my character (instance name hero_mc )can't pass through the buildings(instance name block_mc). I have been looking at tutorials on the web and most of them cover it so that a text appears if you hit the object whereas I want it so my character can't pass through or well is "push back", the one tutorial I found doesn't want to work for me, but it's not giving me any errors so I really don't know what is wrong with it.
Actionscript Code:
hero_mc.addEventListener(Event.ENTER_FRAME, enter_frame); function enter_frame(event:Event):void{if (hero_mc.hitTestObject(block_mc)) { trace("hero _mc is next to block_mc") } else { hero_mc.y += 10 hero_mc.x += 10 } }
My character still passes through the block objects.
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Jul 22, 2011
I have this thing where orbs are supposed to stick together, so I put them all in an arrayand told them to stick together when they encounter another member of that array.However, they only stick in groups of up to four, and then the orbs begin to overlap and such.
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May 12, 2009
I am working on a game that involves a play head (called playHead) moving along the screen and when it encounters various movie clips it triggers a sound to be played. It is all going well except that the sound seems to want to play more than once, so there is a staggered wierd sound. Is is possible to make the sound only play once and also it needs to play until the the sound has finished. (the sounds are all very short).Here is the code:
onClipEvent(enterFrame){ if (this.hitTest(_root.playHead)){ _root.sound15.stop(); _root.sound15.attachSound("over"); _root.sound15.start(); } }
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May 20, 2009
I have a playhead that moves across the screen and when it hitTests a movie clip it plays a sound. all is working fine except that it will only work the first time it is played. The playhead is controlled by a button. I am working in Actionscrpt2. Here is the code on the movieclip:
onClipEvent(enterFrame)[code]....
In the begining I was having trouble because the hitTest was playing the sound over and over but the above code sorted that out. I think that the new problem was created by fixing the old one.
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Aug 16, 2009
These codes are in the draggable MC: fish1_drag this is my code:
onClipEvent (enterFrame) { this.onPress = function() { startDrag(this); };
_root.UI1_mc.UI1_mc2.inv_mc.ISpace1.onEnterFrame = function() { if (this.hitTest(fish1_drag)) { stopDrag(); } else { } };}
I keep jumbling it up so that one thing works but the other doesnt. But basicly I need it so that when I drag fish1_drag (instance name) over ISpace1 (which is within many MCs : _root.UI1_mc.UI1_mc2.inv_mc.ISpace1 but opens up so you can drag it over it) for it the drop on the ISpace1.
I have another MC in the library and il get that the attach to the ISpace1 but what im finding difficult is just being able to drag the fish1_drag over the ISpace1 and releasing.
Here is some other reandom code that I have in a comment on my AC panel:
/*
this.onRelease = function() { stopDrag(); _root.UI1_mc.UI1_mc2.inv_mc.ISpace1.attachMovie("fish1_mc","attached1 ",this.getNextHighestDepth()); _root.invCount += 1; updateAfterEvent(); // I probly dont need this updateAfterEvent. but its there anyway. };
*/
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Apr 7, 2010
i'm trying to build this simple game for school:you've got a catapult which launches a "bullet" and you will have to aim it to hit a certain point.Now the whole catapult part and shooting the "bullet" works, but now it has to respond when it hits something, and that's where i'm stuck.
I've included:
if (stok.kogel.hitTestObject(this.muur)) { trace("ball hit") }
but I just can't seem to get an trace back.(PS: here's the file as refference (all AS is in the catapult))
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Aug 17, 2010
how to perform hitTest between mc within an mc??i tried it in the same timeline and it works, but those two movieclips (BLUE COLOR) is inside different MC'sis there a way to perform a hitTest between them??
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Sep 8, 2010
I'm trying to make it so that when a movieclip (box) touches another movieclip (exit), it goes to frame 2.I've made it so that (box) moves with the arrow keys and doesn't go pat the barriers (boulders) using this:
x.onEnterFrame = function()
if (Key.isDown(Key.RIGHT)) {box._x += 5;}
if (Key.isDown(Key.LEFT)) {box._x -= 5;}
[code]....
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