I have a dynamic platform which is moved by the keyboard. Think brick breaker games.
I want it to reflect other dynamic objects that hit it, but I don't want it to get knocked all over the place.
How do I do that?
Appreciate the help. Thanks.
You can make the platform a kinematic body. Set the type to b2_kinematicBody in the body definition before you create it, or do body->SetType(b2_kinematicBody) after you create it.
Kinematic bodies do not respond to forces or impulses, so you will need to use SetLinearVelocity to move it. They also do not collide with static bodies so if you have static-body walls at the side of your playing area, the platform will be able to move right through them - you'll have to check the position each time step to see if the platform should stop.
Related
So, I'm pretty much a beginner in Flash and Actionscript (using AS3, as I said in the title), and I'm trying to make a basic escape the room game. I haven't gotten far, and right now that's because every time I test my game (or publish preview it) the graphics get this annoying outline. Here it is when tested: http://i305.photobucket.com/albums/nn228/chokingondrama/flash.png
Every outline corresponds to some object present in the game, most of which have an alpha component of 0 since they're on different sides of the room. This didn't happen before, but once I added the code that allowed the player to change their view with the arrow (each viewpoint/wall is a different frame) these appeared.
It's a little different when published to HTML, basically it just gives each image a white background: http://i305.photobucket.com/albums/nn228/chokingondrama/html.png
Also, it would be nice if somebody could give me advice on how to make sure importing to flash won't result in lower quality.
Thanks in advance. If needed, I'll post any part of the code.
Some tips:
Don't set alpha to 0, instead use the visible property, setting movieclip.visible = false will make it a lot more efficient.
As for the importing and quality, after you import to stage or library, bring up the library (ctrl + l), and right click on the file you imported, go to properties. If it's an image, set compression to lossless, and allow smoothing.
For audio, go to file-> publish settings, and change audio stream and audio event (whichever you might use) to 128kbps.
As for your main question, I need more info, if you want you can post your source. It might be because of how you are placing your graphics on the stage.
For each of your MovieClips in question:
Try disabling button mode and see if the rectangles go away.
movieClipName.buttonMode = false;
If that doesn't help, or you really want button mode, try setting
movieClipName.tabEnabled = false;
There's a chance that since you added keyboard interaction each of your MovieClips are now expecting to be selected by the user when they press the tab key, much like any normal web form.
tabEnabled in the docs
You could also try
movieClipName.focusRect = false;
focusRect in the docs
I'm trying to build the fruit ninja type swipe to some of my buttons in Flash CS6 and ActionScript3.
In trying to figure it out this is what I have come up with:
get the coordinates of where the user first put his finger mouse down,
then where we lifted it
see if your button touches any of those coordinates (if yes, execute that button code)
run some kind of animation between the first two coordinates (mouse down, mouse up points)
am I on the right track?
Also, has anyone already done this so that I can look at their code?
Thanks!
Check out this series on the subject by the great Emanuele Feronato, using the physics library Box2d:
Slicing, splitting and cutting objects with box2d
Part 2: Actually split the object
Part 4: Using real graphics
(I couldn't find part 3 but I don't think we're missing anything too important there). Hope this helps!
Basically the title, because I've had alot of trouble with using the SetLinearVelocity with my kinematic bodies I've decided to use SetPosition instead. In regards to triggering contact events etc. is it better to move them using SetLinearVelocity or will SetPosition be fine as well.
If you just want the kinematic body to move around and trigger sensors then you can get the same results using either SetLinearVelocity or SetPosition.
Where you will get different results is when your kinematic body collides with dynamic bodies. If you are driving the position manually with SetPosition then the solver obviously wont have the velocity information for the body to calculate things correctly such as friction.
I just started to study the Model View Controller pattern. I now understand the basic usage of MVC, but when i tried to implement MVC in a simple test, i ran into a problem. Ofcoarse I could easily adjust the code so it works, but I wish to learn how to correctly implement the MVC pattern.
The test:
I used actionscript 3 to make a simple program. It consist of a turret, and a mouseclick. The turret is in the middle of the screen. When I click anywhere the turret rotates towards the point where I clicked. Both the mouse and the turret have their own model,view and controller. When I click, the MouseModel changes correctly. But for the actual TurretView to respond, the TurretModel must change its rotation variable and send out an event.
The question is who responds to the MouseModel event?
/------->MouseControl------\
/ \
MouseView ?<---MouseModel
TurretView <------------------TurretModel
TurretControl
I figured its best not to have MouseModel directly influence TurretModel or TurretControl, because this would require them to be an eventListener. Making TurretView listen to the MouseModel, and then tell TurretControl to adjust TurretModel, after wich TurretView can update trough a TurretModel event looks like a lot of extra code for a simple task. Also I'd rather not have MouseControl affect TurretModel, this would break the flexibility of the mouse as input for future classes.
Ow, also in which class do I put the code for the angle calculation?
Thanks in advance
Remember that the goal with MVC is primarily the separation of Model and View, and the Controller can serve as the communicator between the two.
Unless you are planning on storing each action that occurs (clicking, rotating, etc.), there is no real need for an action (in this situation) to send data to the Model. Everything you'd like to do should be easily handled with the Controller. So the flow would be:
Mouse click
Event is fired to trigger a command (in the Controller), passing along the mouse location
The command calculates the turret's rotation
The command tells the View to rotate the turret
This is, of course, my suggestion based off of your example. In truth, depending on the project, the above flow could easily change (for instance, in this situation it seems good to do rotation calculation in the command, but in other situations that may not make as much sense). Look at MVC as a goal - you're trying to separate these elements as much as possible, but there is no 100% "works-every-time" way to do it.
Robotlegs, a popular MVC framework, has a great diagram on their site showing how they tackled MVC:
http://www.robotlegs.org/diagram/
I'm not advertising that you NEED to use Robotlegs (it's good, but there's plenty of other alternatives), but they definitely made a pretty diagram :)
You should have one model, which then has pieces in it that you are currently calling MouseModel and TurretModel. You can either keep those names and breakdowns, or do something else once you have a better "handle" on what needs to be done.
The View that is tracking the mouse clicks should dispatch an event that your Controller component catches to update the TurretModel (at this point, there's probably no need for a MouseModel). Your TurretView can then update itself based on the TurretModel, or the Controller can update the TurretView based on the new value. This will depend on how you have it wired.
Usin a Framework such as Robotlegs can help you figure out all the ins and outs of this process, and I've heard that this book http://shop.oreilly.com/product/0636920021216.do provides a great explanation of MVC, even if you don't choose to use Robotlegs after you read it.
Hallo, I been having this problem for a while and I have no idea how to solve it.
I have a flash game (very much like a normal memory game) that has a lot of Movieclips in it that has MouseEvents attached to them. But, when I add a bitmap over the stage (used for covering lots of unwanted things and has to be there) that is the full size of the screen non of my events are fired anymore. The reason is that the overlay bitmap is stealing all of the events.
How can I stop this behavior? Is there a way of letting the events pass through the overlay object? Or for the overlay object to be ignored when it comes to events?
Thanks.
Assuming your overlay is stored in a variable m_overlay, then
m_overlay.mouseEnabled = false;
However you said it is used for "covering lots of unwanted things" so perhaps we need more information on what you are trying to achieve?
I've solved this in the past by creating "proxy" object to capture mouse clicks. The MCs under the bitmap aren't going to receive events.