Rotate Sprite with Shape « cocos2d for iPhone

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Rotate Sprite with Shape

(13 posts) (3 voices)

Started 1 year ago by inveni0
Latest reply from araker

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inveni0
Member

I've just downloaded Chipmunk 5.3.4 and inserted the macosx/Chipmunk-iPhone folder into my project. I have a functional environment (ie., I have a "floor", and when I tap the screen, a block appears and falls to the floor...basic). It all works, but the sprite doesn't rotate with the shape. I've read that I need to include CCSprite (or cpCCSprite) in my update declaration and assign rotation to that, but I can't get CCSprite to work, and I can't find a declaration for it in the Chipmunk-iPhone folder.

Any ideas?

Posted 1 year ago #
Benihana
Member

but I can't get CCSprite to work,

What does that mean? Why don't you post the update code you're trying? Have you looked at any of the Chipmunk tutorials or examples?

I'd help you, but I've only earned my Box2d badge.

Posted 1 year ago #
inveni0
Member
I'm trying this:
```
[shape->data setTransform:CGAffineTransformMakeRotation(shape->body->a)];
```
But shape->body->a is returning null...

EDIT: Correction...it doesn't return "null", it just returns 0...in other words, the shape doesn't rotate.
Posted 1 year ago #
Benihana
Member

But shape and shape->body are valid pointers?

On a completely unrelated side note, I don't see that setTransform: is a valid CCSprite, CCNode, cpCCSprite, or cpCCNode method (or that any of them have a transform property). If I'm not mistaken, this will cause you problems. You also may need to cast your data pointer (since its type is void).

Posted 1 year ago #
inveni0
Member
Yes, the pointers are valid. I'm using this to set the position:
```
[(UIView *)shape->data setCenter:CGPointMake(shape->body->p.x, 480-shape->body->p.y)];
```
I have tried casting to UIView, and if I plug a random radian (like 90) into the setTransform property, it DOES rotate to 90. I just can't get it to match the way the shape should be rotating. In fact, I'm not even sure the shape IS rotating. Is there a way to visualize the shapes so that I can see exactly what's going on?

EDIT: Also, I'll try to clarify how I'm using Chipmunk. I have a standard iPhone app that is using UIViews to display data/sprites. Then, I've imported the Chipmunk-iPhone files into the app, and I'm attaching the shapes to my UIViews. So, there are no CCSprite (or similar) declarations because there are no headers for CCSprite in the Chipmunk-iPhone files. That's why just assigning properties to the UIView works, but shape->body still doesn't seem to be rotating.
Posted 1 year ago #
Benihana
Member

Like I said, I don't have my Chipmunk badge, so someone else will have to answer.

However, you totally blew me away (and probably anyone else reading) with that last statement. You're storing a pointer to the UIView in your shape's custom data pointer? And 90 is not a valid radian (or rather, it's 28.7 * pi which is about 126° after you spin around 14 times).

Posted 1 year ago #
inveni0
Member

Yes, I know that 90 is not a valid radian, but it IS a value that WILL rotate the UIView to SOME degree, proving that I can access shape->data as a UIView.

Posted 1 year ago #
Benihana
Member

Why are you rotating the UIView, when you mentioned that your goal is to:

It all works, but the sprite doesn't rotate with the shape.

Sprite != UIView.

Posted 1 year ago #
inveni0
Member

It is a sprite in the traditional sense of the word...it's not a CCSprite or Sprite object with regards to Chipmunk. When I called it a sprite in that one, single instance that you seem to have focused on (even though the rest of my post states that the Sprite functionality is not in my project at all), I was referring to the fact that it is an image attached to a shape. The data type is UIView...not Sprite/CCSprite/cpCCSprite.

Posted 1 year ago #
Benihana
Member

(even though the rest of my post states that the Sprite functionality is not in my project at all)

Considering you edited your post after I replied...

Since this has nothing to do with cocos2d, perhaps you'll have better luck finding a mind reader over at the Chipmunk forums:

http://www.slembcke.net/forums/viewforum.php?f=1

Posted 1 year ago #
araker
Moderator

@inveni0, try to be as specific and accurate as possible. Editing your post after benihana already replied and then trying to blame him for not understanding you, doesn't help to get any support here.

Regarding your problem, it seems that you don't know how to set the angle of a body. Use cpBodySetAngle(shape->body, angleInRadians) for that.

Posted 1 year ago #
inveni0
Member

Whoa, I didn't edit ANYTHING after he replied. That's just bull crap.

I solved the issue. it wasn't with how I was setting an angle, and it wasn't with assigning a UIView to the data property. I simply had to change this:
cpBody *ballBody = cpBodyNew(100.0, INFINITY);
to this
cpBody *ballBody = cpBodyNew(100.0, cpMomentForPoly(1.0f, 8, verts, CGPointZero));

Now, I get rotations.

@araker, as a moderator, I'm sure you can check my edits to see that Benihana is covering his tracks for not reading my posts. I don't edit posts unless I have information to add, and when I do, I put "EDIT:" followed by the additional information. I don't edit if it's been more than 15 minutes since my original post. I answered each of his posts honestly and accurately, but he just didn't have the knowledge of Chipmunk required for giving insight into my issue. Furthermore, I still didn't get any help here...so you're right...I'll have to look elsewhere.

@Benihana, I apologize for sounding rude. After hours of typing in front of a screen (mostly in frustration), social skills leave through the window, and I go straight to being blunt. I didn't edit anything in an attempt to "save face". I'm not interested in that. I was interested in solving a problem. I do appreciate the help you attempted to give.

Posted 1 year ago #
araker
Moderator

@inveni0, by coincidence I followed this thread closely, so I know what happened in which order. I'll send you a PM with some more details, to keep this thread clean.

Posted 1 year ago #

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