Flash - How To Climb Up Or Stick To Other Objects In Box2D
Jan 12, 2012
I know that trying to model character movement in Box2D is always hard/impossible, but I'm trying to see if there's any way to make an user-controlled object that cleanly slides against other objects, going up or down, that makes it look like the character is climbing/walking up or a down. The character could be modelled as a circle if that simplifies matters, but I don't see how I could get this effect using just a circle with a joint motor.
There's a "wheel joint" in the C++ version of Box2d, which I suppose I could port to Flash, but I don't know if that would give the correct effect either. Another idea I had was to have the character do little jumps, based on the normal of the object that it is touching. But I suspect that at corners, or at contacts with multiple objects, this will give weird results.
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Jul 26, 2011
i'm using flash with box2D 2.1a. i'm rotating ball hanging on the string. The path which the rotating ball trace is ellipse. When releasing the rotating ball from the string i want the ball to fly with the obtained direction, velocity and strength. As you can see in the pictures.[URL]..I've tried to do it with setPosition (method of b2Body) and with various joints. But I haven't got the needed results.
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Aug 1, 2011
How can I make it so that my character climbs a ladder whilst holding the down button?
[Code]...
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Jan 3, 2011
I'm making a game like Arkanoid and to move the ship with mouse, I'm using the following code :
var mousex:int = costume.stage.mouseX;
if (mousex < paddleWidth/2)
mousex = paddleWidth/2;
else if (mousex > PhysiVals.STAGE_WIDTH - paddleWidth/2)
[code]....
Everything's going fine there! The paddle is moving the way it should! The problem is I want a little inclination towards the direction its moving and when it stops moving the angle of inclination should become zero.
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Jul 24, 2011
I'm working on a AS3 Game Engine at the moment utilizing Box2D (2.1a) and 2D shadows. I have Box2D down but I've yet to find a way of drawing 2D shadows efficiently.I was following this tutorial only to be disappointed by the speed at which it rendered the Box2D shapes and the shadows.I was getting the vertices of the objects via this function:[code]And using it to draw the shadows via the AS3 graphics api.Can anyone recommend me a better more efficient way of programming 2D shadows?
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Jul 26, 2011
I'm a bit newbie to Flash, and I'm experiencing strange problem. I have a simple flash application, which when run in Flash player looks like this
the thing is, when i resize the Flash player window, a black frame becomes visible to the left and top of the stage. is it possible that these black areas start appearing on the right side, and the stage to be fixed on the left? The strange thing is that these black areas are not part of the stage, the (0,0) coordinate is there where white area starts and not in the corner of the window, and that's causing me problems.
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Feb 13, 2011
I have a b2PolygonShape body and apply a force to it.
_recbody->ApplyForce( b2Vec2(6.0, -6.0), _recbody->GetWorldCenter() );
I want to change the centre of rotation of the body to be more in the front of the body. So that applyForce and also collisions make the body not turn in the centre but more in the front.
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Apr 14, 2011
I'm making a Flash game, and I've encountered a really weird problem while trying to draw a polygonal shape in Box2D.
Here's the code I use:
var fixtureDefs:Array = new Array();
...
var fDef:b2FixtureDef = new b2FixtureDef();
fDef.density = 0;
[code]....
Where vertexArray is a valid array containing 4 b2Vec2 vertices, making up a convex shape.The problem is, when I test, collisions don't work right for that body. Most other objects -enemies, user-controlled characters - pass straight through, as if the body isn't there at all. Some raycasts pass through as well.
Infuriatingly enough, one kind of bodies I have (a custom enemy) somehow does detect the body and collides with it. The raycasts that particular kind of enemy attempts do work - when your character hides behind the polygon, it's like they can't see him.The other weird thing: when I try the same code, only go for SetAsBox instead of SetAsArray, it works exactly as it should.I'm using a custom ContactListener class, but I haven't done any contact filtering (unless it's possible to do that without realising).I'm using the Flash 9 version of Box2D 2.1a.
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Jan 13, 2012
Is it possible to modify a shape within a body after assigning it, for example I have a box shape for my game hero body, and when I press the down arrow I want my hero to crouch witch means that I need the body shape to be resized.
I've already searched in google but it appears that the topic of modyfing shapes is not so popular. If it's impossible maybe you know a better way of doing this.
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Jan 24, 2009
I want stick my flash file to the left-bottom corners of browser window. I used below html code for this purpose but when I change the size of my browser flash file goes down.[code]
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Apr 25, 2011
I have been starting to code in ActionScript, and tried to do this program. It draws a shape into the stage, and you can move it using the arrow keys. I added a "edge sticking" feature that sticks half of the shape to the edge.[code]...
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Mar 9, 2012
I want to know if box2d b2BodyDef has a massdata property or if it can be accessed in some way. I am not sure whether this can be done in Cocos2D but I have seen it in the flash code I am trying to re-implement in cocos2d.Here is the the code that brought about the question.
[Code]...
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Feb 24, 2011
I'm trying to create spinning shapes floating in space. There is still gravity in the environment, however it should not affect these platform objects because they are static (right?). How can I apply a constant angularVelocity to it though? It doesn't seem to apply when I assign it a value, probably due because it's static.
The simplest example would be a spinning gear, an automated teeter-totter (not influenced by external forces). All I'm trying to make is a spinning rectangle that could interfere with a ball controlled by the user.Do I need to use Joints to pin it in place? How can I specify the details of not being influenced by the dynamic objects?
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Apr 12, 2011
i am listening contact between dynamic bodies. But cannot listen contact between dynamic and static bodies .
I can handle collision detection on my b2contactListener class with this metod.
public override function BeginContact(contact:b2Contact):void {
// getting the fixtures that collided
var fixtureA:b2Fixture=contact.GetFixtureA();
[Code].....
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Nov 20, 2011
I have setup a box2d world with a keyboard controlled player. The player can walk and jump. How do I prevent the player from "sticking" to walls while jumping and pressing the directional key towards an object?
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Jan 24, 2010
I've created a small game with Box2d for AS3 - I have sprites attached to the stage that take their position from the underlying Box2d world. These sprites are mostly PNGs.When the game runs with DrawDebugData() bening called every update, it runs nice and smoothly. However when I comment this out, it runs choppily. In both cases all my sprites are being rendered. So it seems that it's running faster when it's drawing the debug data additionaly (i.e. my sprites are on the screen in both cases!)What's going on? Does drawing the debug data flick some sort of 'render quick' switch? If so, what's the switch!? I can't see it in the Box2D code.
function Update(e){
m_world.Step(m_timeStep, m_velocityIterations, m_positionIterations);
// draw debug?[code]...
Interestingly, If i set the debug draw scale to something different to my world scale, it slows down to 19fps. So there's something happening when it draws the boxes under my sprites causing it to run quicker..
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Jan 29, 2011
I'm making a Flash game where the player throws balls of mud at objects in the sky. I'm using Box2D to model the physics. I don't want the ball to bounce off of objects (apply a normal force); instead I want it to impart its momentum on the object it is striking (like a movie-style shotgun blast).
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Feb 26, 2010
I need to build a flash learn game to my students. It is to explain the angles and phisics over the billiard/snooker Table. Something similar to this: [URL] The only thing I can do until now is drag the ball! My doubts are:
- How to make the stick move with the center in the point near the ball;
- How to draw the yellow line;
- How to calculate the corners;
- And in the last, how to move the ball with accelerated motion when press a button.
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Dec 25, 2010
I'm, working on this pool game: [URL] open it in TWO browser windows you will see that the 2 player modus starts. When you make a shot, every shot gets copied to the other player. Unfortunately it is not precise enough. The player makes the shot with this code:
[Code]..
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Dec 10, 2009
I've struggled with this for a long time and have thrown in the towel. How the heck do you climb the ladder, then go back down again into another clip?
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Aug 7, 2010
I'm trying to get a movieclip of a person to climb a movieclip of a wall, but the wall is uneven, so I'd like the person to hug the surface of the wall closely (without leaving it at all, actually) as it climbs vertically up it.
This is the code I've come up with, but the player just goes to the wall's initial x value and climbs straight vertically from there, without following the curve of the wall:
Code:
var climbSpeed:Number = 5;
addEventListener(Event.ENTER_FRAME, climbing);
function climbing(evt:Event):void {
[code]....
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Oct 25, 2010
It looks to me like the easiest route in AS3 is to use a Shape/Sprite's Graphics property to draw these lines, clearing and re-drawing each time the stickman changes. But some of the newer Flash 10 stuff seems to suggest a closer functionality to 3D graphics where you can define points and lines/triangles and then move the points rather than recreating all from scratch each render. Is this the case?
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Jul 30, 2009
I have a clip that I want to rotate 90deg every 12 seconds. The duration of the tween is 4 secs. I've noticed that after a while the clip doesn't rotate a full 90 degrees, and the whole thing gradually drifts out of the correct angle. If I trace the clip's rotation it shows 0, 90, 180, -90, etc. for a while then may start throwing out e.g. -106.22701125.my initial code just added 90deg to the clip's current rotation value:
Code:
var timer:Timer=new Timer(12000);
timer.addEventListener(TimerEvent.TIMER, onTimer);
timer.start();
[code]....
...however the sticking still occurs, and may be related to other events happening on the stage, albeit these are pretty simple mouseOver events and shouldn't hammer resources.
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Oct 18, 2010
how to use Box2d?
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May 9, 2010
i know how to make an animated mask to have an image on top of another to have them transition as the mask passes thru..but this time instead of animating the mask i was wondering how to make the mask be sort of a brush on the tip of the mouse pointer..
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Oct 10, 2009
I've been experimenting with shape tweens using the line tool to make stick figures, and using shape tweens to make the figures move around. It's great fun, but I've been running into a particularly disruptive problem. For example, I'll have a stick figure in one spot at frame 1. I move it across the screen using a shape tween, and bend one of his arms over the course of 10 or so frames. The problem is, Flash seems to be misinterpreting what ought to happen during the tween. Instead of just bending the arm, Flash makes the arm rotate in a full circle. It still ends up where it ought to at Frame 10, but it takes the wrong path to get there. I've attached a video to illustrate what I mean. Look at the upper body piece right at the end. Is there any way I can fix this without having to animate frame by frame?[code]...
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Mar 22, 2010
I've got a group of buttons that don't navigate but show a tool tip. I have some of the functions working fine but can't seem to get my current button to stick. What am i overlooking here? fla: [URL]
[Code]...
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Nov 3, 2011
I have a bat and ball game and was wondering what eventlistener I would use to include a hand that would hold the bat instead of the mouse using the bat.I have made a new class called hand and addChild (aHand) and I want the x and y to stick to the bat I already have that is pinned at the bottom of the stage.
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Aug 20, 2010
I recently did a quick demo on my site of Box2D (Box2DFlashAS3) with source code. Its basically just the HelloWorld example from the v2.1a distribution, but with a few tweaks. The most notable is that my version does not require a Flash FLA file to compile and run, its pure AS3. Simple and a good base to build on:
http:[url]........
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Dec 17, 2011
Anyone know how to get BOX2D physics engine working on iOS? It seems to work on the adl tester but not when I actually test it on the device.
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