Game Development Reference
In-Depth Information
CGPointMake(size.width * idx, 0.0);
backgroundNode.name = @"background";
After all this, our init method is ready as shown in the following screenshot:
Now let's see how these backgrounds added on FSParallaxNode are to be scrolled; it
will be done by an instance update method.
1. Some cleanUp has to be done or in other terms some code movement. Copy the
two static methods used in the FSMyScene to FSParallaxNode class used
for some math, remove the initialization of the SpaceBackground method and
the call of moving background made in the update from FSMyScene . Cut the
code of the method for moving the background from the FSMyScene file and
paste in the updateForDeltaTime function of FSParallaxNode . Now we
will be making some tweaks to the method.
2. SKParallax node is the parent for all the other nodes of backgrounds added on
it. So using the velocity, send in the init and diffTime , method which will be
passed by the FSMyScene update methods, we calculate the position of the par-
ent that is, FSParallax node.
- (void)updateForDeltaTime:(NSTimeInterval)diffTime
{
CGPoint bgVelocity = CGPointMake(self.velocity,
0.0);
CGPoint amtToMove =
CGPointMultiplyScalar(bgVelocity,diffTime);
self.position = CGPointAdd(self.position,
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