Breaking single shape into multiple small shapes.

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Breaking single shape into multiple small shapes.

(5 posts) (2 voices)

Started 11 months ago by y2kreddy
Latest reply from y2kreddy

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y2kreddy
Member

Hi Developers,

i am using spacemanager/chipmunk i want to Break single shape into multiple small shapes when collided. i am using this code which is already there in spacemanager example code, what it does is it breaks a rectangular shape into multiple rectangular shapes.It creates its own colors for the broken shapes, what i want to do is assign my own sprites to the broken shapes, i have tried the code in comments and it did not work out.

'cpShapeNode *fragShapeNode = (cpShapeNode*)(a->data);

//fragment our shape
NSArray *frags = [fragShapeNode.spaceManager fragmentShape:fragShapeNode.shape piecesNum:16 eachMass:1];
fragShapeNode.shape = NULL;

//step over all pieces
for (NSValue *fVal in frags)
{

cpShape *fshape = [fVal pointerValue];
//cpCCSprite *sRectSprite = [cpCCSprite spriteWithShape:fshape file:@"staticrect.png"];
cpShapeNode *fnode = [cpShapeNode nodeWithShape:fshape];
fnode.color = fragShapeNode.color;
[game addChild:fnode];
// [game addChild:sRectSprite];
}'

All i get is a single static rectangle.
Thanks in advance.

Posted 11 months ago #
mobilebros
Moderator

Hmmm.... that's curious, can you breakpoint in the for loop and see how many loops it does, or if it even gets in there? Also what kind of shape is this? If it's a polygon then SpaceManager only supports rectangles at the moment.

[Edit:] Moved to Physics

Posted 11 months ago #
y2kreddy
Member

Changed some code and go the single shape to be broken into multiple, now the broken shapes fall down with my desired sprite as expected ,But some default static sprites remain as is . Please try this code and see what happens.

for (NSValue *fVal in frags)
{

cpShape *fshape = [fVal pointerValue];
cpShapeNode *fnode = [SpaceManagerCocos2d createShapeNode:fshape];
cpCCSprite *sRectSprite = [cpCCSprite spriteWithShape:fnode.shape file:@"staticrect.png"];
[self addChild:fnode];
[self addChild:sRectSprite];
}
[fragShapeNode.parent removeChild:fragShapeNode cleanup:YES];

@mobilebros Answer to your question-- yes it iterates 16 times as expected and creates 16 shapes.

Posted 11 months ago #

Well I see a red flag right away, you can't attach a shape to more than one node; it's locked in a 1:1 relationship and you'd have to change SpaceManager's iterateFunc in order to make it 1:n.

I edited your code to make it work and look somewhat right:

for (NSValue *fVal in frags)
        {
            cpShape *fshape = [fVal pointerValue];
            cpCCSprite *sRectSprite = [cpCCSprite spriteWithShape:fshape file:@"staticrect.png"];
            sRectSprite.scale = 1/3.4f;
            [self addChild:sRectSprite];
        }
        [fragShapeNode.parent removeChild:fragShapeNode cleanup:YES];

Posted 11 months ago #

y2kreddy
Member

its working perfect, thanks for that mobilebros, But for this to work, i have to create the cpshape like this.

cpShape *fragShape = [smgr addRectAt:cpv(100, 180) mass:STATIC_MASS width:60 height:60 rotation:35];
   fragShape->collision_type = kFragShapeCollisionType;
   cpShapeNode *fragShapeNode = [cpShapeNode nodeWithShape:fragShape];
   fragShapeNode.color = ccORANGE;
   fragShapeNode.spaceManager = smgr;
   [self addChild:fragShapeNode];

the above code is already there in spacemanager example program. if the do it without the cpshapenode , i am not able to break the shape into multiple smaller shapes. i tried to modify this code to add my own sprite like i normally create a shape and sprite, here is how i am trying to do it.

Stone = [smgr addRectAt:cpv(200,200) mass:[GameLayer massofobject:Stone :160 :57] width:160 height:57 rotation:0];

    NSLog(@"mass of stone is %f",[GameLayer massofobject:Stone :160 :57]);
    Stone->collision_type = kStoneCollisionType;
    Stone->e=0;
	Stone->u= 1;
    cpShapeNode *stonefragnode = [cpShapeNode nodeWithShape:Stone];
    stonefragnode.color = ccBLUE;
    stonefragnode.spaceManager = smgr;
    [self addChild:stonefragnode];

    StoneSprite = [cpCCSprite spriteWithShape:stonefragnode.shape file:@"Stonre01.png"];
    [self addChild:StoneSprite];

    //stonefragnode.spaceManager = smgr;
	StoneSprite.spaceManager = smgr;

what i get now is a blue static sprite and a shape with sprite attached like i want, how can i get rid of the blue static sprite?

Posted 11 months ago #

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