How to get touch event on specific image

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How to get touch event on specific image

(19 posts) (3 voices)

Started 2 years ago by iphonemobdev
Latest reply from PhilM

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iphonemobdev
Member

Hi,

I have to push ball using one object like in pinball game at starting step. Object should push to ball and ball should go to straight direction. When user push to ball using push object, it should display like spring object and when user will leave his finger, it jump and push to the ball.

For that i need to get touch event on this push object images only, how to get this touch event on any specific event. Which function should i use to push ball based on collision force.

Please anyone help me on this topic. Thanks so much.

Thanks,
iPhoneMobDev.

Posted 2 years ago #
sunsu
Member

Please see the "TouchesTest" example included in the Cocos2d-iPhone source.

-Sunsu

Posted 2 years ago #
sunsu
Member

I can attest that the TouchesTest demo is very nice. I will say, however, that I am having some trouble implementing it correctly into another scenario I am working on.

-Sunsu

Posted 2 years ago #
PhilM
Member

I agree the new touch dispatcher is VERY nice, especially for touch enabling nodes/sprites easily.

What issues are you having Sunsu?

Posted 2 years ago #
iphonemobdev
Member

Thanks man, i got touch event on image from one forum post in this forum only but still i am confused with collision force, how to get velocity and how to set new direction to the ball etc. Do you have any tutorial regarding this.

Thanks.

Posted 2 years ago #
sunsu
Member

Well basically I am trying to extend TileMapAtlas to create a TileMapLevel that you can touch and drag around using the NEW touch stuff (havnt done anything with it yet) so you can view the whole thing (as well as quite a few other changes later, but i'm just starting with this). I cant get touches to respond correctly though. I get no errors, just touches are not recognized.

Here's the main bits of the code if your interested in helping :):
TileMapLevel (trying to make it dragable): http://sunsu.pastebin.com/m1323da83
GameNode (interfacing with TileMapLevel): http://sunsu.pastebin.com/m6731eaa0

Posted 2 years ago #
PhilM
Member

hmmm, I haven't used TileMapAtlas, so I'm not totally sure.

But I did have some issues getting the touch dispatcher to fire at first.

What does your TileMapLevel class extend from? If its a Layer, or something that can already handle regular touches you don't need to use the onEnter/onExit methods to add or remove the touch dispatcher.

I made sure the old 'isTouchEnabled = YES;' was still in the init (I think thats still needed) & added the TargetedTouchDelegate protocol with this method:

-(void) registerWithTouchDispatcher
{
[[TouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:INT_MIN+2 swallowsTouches:NO];
}

It was some weeks ago I got this working, so I may have missed something, or be wrong, but I certainly did have some issues getting it all to work at first with custom layers.

To get it working with Sprites / regular nodes (that don't normally handle touches) the regular onEnter/onExit methods you used worked fine for me (& were actually easier to setup than the layer code)

Hope my ramblings help you in some way!

@iphonemobdev sorry for taking your thread off on a tangent. Haven't dealt with collision forces etc. Have you looked at chipmunk/box2d? They might help you do a pinball style game, rather than implementing the math/physics yourself.

Posted 2 years ago #
sunsu
Member

I extend from TileMapAtlas. So the onEnter/onExit methods should work (right?). *sigh* maybe I found a bug or something, but I don't know enough about it to tell.

Dragging the TileMapAtlas around worked fine when I had it implemented directly into my GameNode without the abstraction to TileMapLevel. But I'm trying to get more familiar with actually working with and extending objects (instead of brute forcing it by writing in C style), so I'd really like to get this to work.

Thanks for your help,
-Sunsu

Posted 2 years ago #
PhilM
Member

Yea your right it 'should' work! I can't see anything that looks out of place compared to my touch enable CocosNode stuff. Perhaps it is specific to the TileMapAtlas itself?

Just to check, have you put the <TargetedTouchDelegate> protocol declaration in your header file? Not sure if its needed for nodes, but I've got it in my code (may just be left in after trying various things myself).

I'd put NSLog's in the onEnter/onExit methods just to be sure they're getting called (which I presume they should be, but might be worth checking).

Other than that, I'm afraid I'm out of ideas, hopefully someone else with more knowledge on the subject can chime in....

Posted 2 years ago #
sunsu
Member

I do have the TargetedTouchDelegate in my header file. I'll try testing out the onEnter onExit methods as you suggest. I also posted a question in the 0.80 RC post to see if maybe it's a bug. Hopefully I can get this working because the new touch delegate stuff looks great!

Thanks again for your help!
Sunsu

Posted 2 years ago #
sunsu
Member

Ok, now this is weird:

I put NSLog(@"description"); in every method in the TileMapLevel object and none of them get called, yet the TileMapAtlas returned from TileMapLevel shows up? How is this possible?

Hopefully someone has some insight into this because I have no idea whats going on with this. I just want to get the Touch Dispatcher working on a extended TileMapAtlas :(.

TileMapLevel (None of the NSLogs fire):
http://sunsu.pastebin.com/m6b1994bd

Associated GameNode (which does display the tilemap!):
http://sunsu.pastebin.com/m6731eaa0

looking for help!
Sunsu

Thanks,
Sunsu

Posted 2 years ago #
PhilM
Member

ahhh, ok that helps track it down. I only skimmed the touch code in your examples before.

Line 25 of TileMapLevel:

self = [TileMapAtlas tileMapAtlasWithTileFile:tile mapFile:map tileWidth:w tileHeight:h];

Your overwriting your own class reference 'self' with a direct one to the TileMapAtlas object.

So TileMapLevel is not actually returned to the calling code. I think you need to create a property inside your class to hold the reference instead.

Also,
Line 77 of GameNode is not initializing your TileMapAtlas, but instead your directly creating a TileMapAtlas:

TileMapLevel *tileMap = [TileMapAtlas tileMapAtlasWithTileFile:@"tiles.png" mapFile:@"level.tga" tileWidth:TILE_SIZE tileHeight:TILE_SIZE];

should probably read

TileMapLevel *tileMap = [TileMapLevel tileMapAtlasWithTileFile:@"tiles.png" mapFile:@"level.tga" tileWidth:TILE_SIZE tileHeight:TILE_SIZE];

I think that might be the problem, hope that points you in the right direction ; )

Posted 2 years ago #
sunsu
Member

Ahh! Well thanks for taking another look and pointing those things out for me! I must admit this is my first real crack at trying to keep my code "objectified". My current project is way too complicated for me not to do it right!

I'll try to implement the fixes you suggested and post the results.

Thanks again!
sunsu

Posted 2 years ago #
iphonemobdev
Member

Hey,

I got the image touch but the problem is that i need to moved image only at same place like we push spring. Now i am doing like this when any touch event occurred, it will check that this image rect or not then after i moving the image from one place to down side and i am setting current touch location to position of the image. But it set this location at center so my image display at wrong placed.

Anyone has any idea about this probme. Actually when moved from one place to another place that time image should start from x and y. but it set the this location as center of the image. So i am getting misplace.

Thanks.

Posted 2 years ago #
sunsu
Member

You need to calculate the difference between your touch and the center of the image, and move the image accordingly.

-Sunsu

Posted 2 years ago #
sunsu
Member

I seem to have gotten it to work, however I am not very confident that I did it correctly. Specifically:
- Am I using the correct property values for the map property in TileMapLeve.h?
- In GameNode, I add both tileMap.map and tileMap to the layer, is that correct? It doesn't seem like it is, but its the only way I could get the touches to move the tilemapatlas.

Any other suggestion would be greatly appreciated. I might be doing this in the completely wrong way. All I really want to do at this point is create a tilemapatlas that I can drag around using the touch dispatcher.

TileMapLevel.h:
http://sunsu.pastebin.com/m7e600ee9

TileMapLevel.m:
http://sunsu.pastebin.com/m8f02f45

GameNode.m:
http://sunsu.pastebin.com/m65cfb4d7

Thanks,
Sunsu

Posted 2 years ago #
PhilM
Member

Glad you got it working dude!

I'm afraid I'm not very good when it comes to the correct use of properties etc. I'm still very much learning how to do that properly, so wouldn't want to advise you wrongly!

Codemattic's made some very good posts on the subject (as have a few other excellent devs on here), and seems to have a firm grasp on memory management etc. Perhaps if he, or someone in the know, sees your post, and can spare a minute, they could give their feedback?

As for adding 'tileMap.map' and tileMap from GameNode. I'd say you should be able to add 'map' within the TileMapLevel initWithTileFile method. E.g. after line 28 you could do:
[self addChild:self.map];

I think that should still work, and keeps you from having to worry about it in your GameNode.

Other than that, I know very little on tile maps, so couldn't comment on much else. The main thing is its working now! Good luck on the rest of your game ; )

Posted 2 years ago #
sunsu
Member

Dude once again I thank you for your tremendous help! It would have taken me ages to track this stuff down alone. Adding the tilemap using the method you suggest is definitly a better route.

Thanks!
Sunsu

Posted 2 years ago #
PhilM
Member

No probs, happy to help. God knows I've had enough help from others on this forum too : )

Posted 2 years ago #

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