cocos2d: CocosBuilder: How to get positions of keyframes of an animation - cocos2d-iphone

Question

In my application I want to move an object on a path from point to point (based on some event). I want to extract these positions from cocosbuilder file (.ccbi). So how do I extract positions in an array?
One way would be to put sprites on positions and assign them with variables like:
spr1, spr2 spr3
and take the spr1.position in the code.
Another method would be to make an position-animation in cocos-builder. Now extract these keyframes positions in the code. So my question is: "Is there a way to extract positions from the animation keyframes?"

Answer 1

Here is a solution that works with CocosBuilder 2.1.
Add the following function to CCBAnimationManager class:
- (void)enumeratePropertiesForSequence:(NSString*)name Block:(BOOL(^)(CCNode *node, CCBSequenceProperty *seqProp))block
{
int seqId = [self sequenceIdForSequenceNamed:name];
if (seqId == -1)
{
NSLog(#"Sequence %# couldn't be found",name);
return;
}
for (NSValue* nodePtr in nodeSequences)
{
CCNode* node = [nodePtr pointerValue];
NSDictionary* seqs = [nodeSequences objectForKey:nodePtr];
NSDictionary* seqNodeProps = [seqs objectForKey:[NSNumber numberWithInt:seqId]];
// Nodes that have sequence node properties
for (NSString* propName in seqNodeProps)
{
CCBSequenceProperty* seqProp = [seqNodeProps objectForKey:propName];
if (!block(node, seqProp))
return;
}
}
}
Using this enumerator you may access all available properties, e.g. if you are interested just in positions then:
#import "MyClass.h"
#import "CCBAnimationManager.h"
#import "CCBSequenceProperty.h"
#import "CCBKeyframe.h"
#import "CCNode+CCBRelativePositioning.h"
#implementation MyClass
-(void)fn
{
CCBAnimationManager* animationManager = self.userObject;
BOOL(^block)(CCNode *node, CCBSequenceProperty *seqProp) =
^BOOL(CCNode *node, CCBSequenceProperty *seqProp)
{
NSLog(#"Node tag %d, Prop name [%#], type %d", node.tag, seqProp.name, seqProp.type);
for (CCBKeyframe *kf in seqProp.keyframes)
{
if ([seqProp.name isEqualToString:#"position"])
{
id value = kf.value;
// Get relative position
float x = [[value objectAtIndex:0] floatValue];
float y = [[value objectAtIndex:1] floatValue];
// Get position type
int type = [[[self.userObject baseValueForNode:node propertyName:seqProp.name] objectAtIndex:2] intValue];
CGSize containerSize = [self.userObject containerSize:node.parent];
CGPoint absPos = [node absolutePositionFromRelative:ccp(x,y) type:type parentSize:containerSize propertyName:seqProp.name];
NSLog(#"--- relative position (%f, %f), type %d, abs position (%f, %f)", x, y, type, absPos.x, absPos.y);
}
}
return YES; // YES to continue, NO to stop enumeration
};
[animationManager enumeratePropertiesForSequence:#"MySequence" Block:block];
}
#end
And here is how to instantiate MyClass and to call the enumerator:
CCNode *myclass = [CCBReader nodeGraphFromFile:#"MyClass.ccbi"];
[myclass fn];

Answer 2

I think it is possible, although I havent done that myself.
If you look into a ccb file, you will notice that it is just an XML file.
And this XML file stores only keyframe information (which keyframe happens when).
There is a well-documented structure of the ccb file here.
You might wanna have a look how to get the keyframes info.