Question

Does anybody know how slicing effects work in the Fruit Ninja game?

Or any other way to achieve a similar effect?

How to get that all swipe point at how to draw line on that
please help ….

Answer 1

i draw the many lines to give slicing effect and removed points simultaneously from that mutable array where i put the point to draw line

code:-

-(void)init
    {
     [self checkAllArray];
     [self schedule:@selector(removePoints:) interval:0.0001f];
    }
-(void)checkAllArray
{
    if (naughtytoucharray==NULL)
        naughtytoucharray=[[NSMutableArray alloc] init];
    else
    {
        [naughtytoucharray release];
        naughtytoucharray=nil;
        naughtytoucharray=[[NSMutableArray alloc] init];
    }
}

-(void)draw
{
    glEnable(GL_LINE_SMOOTH);
    glColor4ub(255, 255, 255, 255); //line color 
    //glLineWidth(2.5f);
    for(int i = 0; i < [naughtytoucharray count]; i+=2)
    {
        CGPoint start = CGPointFromString([naughtytoucharray objectAtIndex:i]);
        CGPoint end = CGPointFromString([naughtytoucharray objectAtIndex:i+1]);
                ccDrawLine(start, end); // line 1
        ccDrawLine(ccp(start.x-2,start.y-2),ccp(end.x-2,end.y-2));// line 2
        ccDrawLine(ccp(start.x-4,start.y-4),ccp(end.x-4,end.y-4));// line 3
        ccDrawLine(ccp(start.x-6,start.y-6),ccp(end.x-6,end.y-6));// line 4
        ccDrawLine(ccp(start.x-8,start.y-8),ccp(end.x-8,end.y-8));// line 5
    }
}

- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{
    CGPoint new_location = [touch locationInView: [touch view]];
    new_location = [[CCDirector sharedDirector] convertToGL:new_location];
    CGPoint oldTouchLocation = [touch previousLocationInView:touch.view];
    oldTouchLocation = [[CCDirector sharedDirector] convertToGL:oldTouchLocation];
    [naughtytoucharray addObject:NSStringFromCGPoint(new_location)];
    [naughtytoucharray addObject:NSStringFromCGPoint(oldTouchLocation)];
}

-(void)removePoints:(ccTime *)tm
{
    if ([naughtytoucharray count]>0)
    {
        [naughtytoucharray removeObjectAtIndex:0];
    }
}

-(void)dealloc
{
    //NSLog(@"deallocing lightning\n");
    [self removeAllChildrenWithCleanup:YES];
    [super dealloc];
}