I'm creating a game where i'm creating an SKSpriteNode at the bottom. Cause i want to make a buttom higher than the actually bottom cause of grass as the background. The problem is after I've created the physics body and my moving SKSpriteNode makes contact with the bottom. the bottom SpriteNode that i've created will move.
How can i make the bottom sprite node which has the function as being the bottom edge, not move at all. By that i mean that it cant change position.
My code:
SKSpriteNode *bottom = [SKSpriteNode spriteNodeWithColor:[SKColor clearColor] size:CGSizeMake(self.frame.size.width*2, 98)];
bottom.physicsBody.dynamic = NO;
bottom.position = CGPointMake(0, 0);
[self addChild:bottom];
bottom.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:bottom.size];
You have to set the dynamic property of the physics body to NO. You are doing it before you actually create a physics body. That's why it does not have any effect. Change your code to:
SKSpriteNode *bottom = [SKSpriteNode spriteNodeWithColor:[SKColor clearColor]
size:CGSizeMake(self.frame.size.width*2, 98)];
bottom.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:bottom.size];
bottom.physicsBody.dynamic = NO;
bottom.position = CGPointMake(0, 0);
[self addChild:bottom];
And it should work.
Related
I'm trying to create a banner that sweeps across the current scene. I want to create a banner which sweeps down the screen to show the current round. My attempt at it is creating a UIImageView and add it to the current view. However, i assume its calling the didMoveToView Function and resetting everything in that scene, which is something i dont want it to do. Here is my attempt:
-(void)createBanner{
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Banner"]];
[imageView setFrame:CGRectMake(0,0, imageView.frame.size.width, imageView.frame.size.height)];
[imageView setClipsToBounds:YES];
[self.view addSubview:imageView];
CABasicAnimation *sweep = [CABasicAnimation animationWithKeyPath:#"position"];
sweep.fromValue = [NSValue valueWithCGPoint:CGPointZero];
sweep.toValue = [NSValue valueWithCGPoint:CGPointMake(0.0, self.frame.size.height)];
sweep.duration = 10;
sweep.additive = YES;
[imageView.layer addAnimation:sweep forKey:#"sweep"];
}
EDIT: i am using sprite kit in order to create the game.
As hamobi said, it's best to use an 'SKSpriteNode' in Sprite Kit and not UIKit. Assuming your'e adding to an 'SKScene', your code above translated to Sprite Kit is:
-(void)createBanner{
SKSpriteNode* spriteNode = [SKSpriteNode spriteNodeWithImageNamed:#"Banner"]
//It's good practice not to resize the sprite in code as it should already be the right size but...
spriteNode.size = CGSizeMake(self.size.width, self.size.height)
//Set its center off to the left of the screen for horizontal sweep, or you can do vertical and set it off the top of the screen...
spriteNode.postion = CGPointMake(-spriteNode.size.width/2, self.size.height/2)
self.addChild(spriteNode)
//Then to sweep from left to right...
SKAction* sweep = [SKAction moveTo:CGPointMake(spriteNode.size.width/2, self.size.height/2) duration:10]
spriteNode.runAction(sweep)
}
I think that covers most of it.
I am using bodyWithLoopFromRect to create invisible borders on my simulator.
But when I run, the borders don't seem to be made on the left and right sides of the screen. My sprite bounces off the top and bottom of the screen, but it just leaves the screen when it goes on left or right side of the screen.
Heres my code:
-(void)didMoveToView:(SKView *)view {
self.backgroundColor = [SKColor blueColor];
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:#"ball"];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
self.physicsWorld.gravity=CGVectorMake (0,10);
ball.position = CGPointMake(self.size.width/2, self.size.height/2 );
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.frame.size.width/2];
[self addChild:ball];
}
What do I do so that the left and right borders are also made?
Thanks
I'm kind of new with SpriteKit and I'm having some troubles with the physics, I've tried many things to make a SKSpriteNode move with a force or an impulse but it never moves, only gravity affects it when i set it.
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
self.anchorPoint = CGPointMake(0.5, 0.5);
myWorld = [SKNode node];
[self addChild:myWorld];
SKSpriteNode* map = [SKSpriteNode spriteNodeWithImageNamed:#"grass"];
[myWorld addChild:map];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:map.frame];
self.physicsBody.friction = 0.0f;
self.physicsBody.categoryBitMask = 2;
self.physicsWorld.gravity = CGVectorMake(0.0, 0.0);
self.physicsWorld.contactDelegate = self;
pointOfView = [SKSpriteNode spriteNodeWithColor:[UIColor colorWithWhite:1 alpha:0.2] size:CGSizeMake(300, 548)];
[myWorld addChild:pointOfView];
pointOfView.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:pointOfView.frame.size];
pointOfView.physicsBody.friction = 0.0f;
pointOfView.physicsBody.restitution = 1.0f;
pointOfView.physicsBody.linearDamping = 0.0f;
pointOfView.physicsBody.allowsRotation = NO;
pointOfView.physicsBody.collisionBitMask = 2;
pointOfView.physicsBody.categoryBitMask = 3;
[pointOfView.physicsBody applyImpulse:CGVectorMake(10.0f, -10.0f)];
}
return self;
}
Here is most of my code in my main scene, there's nothing else except some empty methods like update or touchesBegan.. Am I missing something ? I've tried so many things, i'm starting to lose it haha
Thanks very much for any help !
It's a bit late, but the answer is here: Not able to apply impulse to SKSpriteNode physics body
The problem is that you've created a physics body with bodyWithEdgeLoopFromRect; this creates a static physics body which won't respond to applyImpulse. You need to add the physics body using bodyWithRectangleOfSize: instead.
pointOfView.physicsBody.dynamic = YES;
The dynamic property decides if a sprite should be affected by physics forces.
you have written wrong code your pointOfView not affected by gravity you are just applying a small impusle on it.
change this line self.physicsWorld.gravity = CGVectorMake(0.0, 0.0) to self.physicsWorld.gravity = CGVectorMake(0.0, -9.8); if u looking for negative gravity towards up direction and CGVectorMake(0.0, 9.8) if you looking for positive gravity towards downwards. and try to apply impulse after a interval [pointOfView.physicsBody applyImpulse:CGVectorMake(10.0f, -10.0f)];
I am having trouble trying to create platforms alongside a invisible line that is in the middle, I want it to have an SKPhysicsBody so that when passed through by the Hero Character, it increases the score, yet I can't seem to imagine the code the would work, specifically how to create the line with it being in the middle of the platform at all times, especially when the platform decides to move. Any tip would be greatly helpful.
|
|
________|_________
| | |
| | |
|________|_________|
This is one way to implement what you described.
- (void) didMoveToView:(SKView *)view
{
// Show outline of physics bodies for debugging purposes.
self.view.showsPhysics = YES;
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
self.backgroundColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
SKSpriteNode *platform = [SKSpriteNode spriteNodeWithColor:[SKColor blueColor] size:CGSizeMake(128, 64)];
platform.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:platform.size];
platform.position = CGPointMake(CGRectGetMidX(self.frame),
CGRectGetMidY(self.frame));
[self addChild:platform];
SKSpriteNode *line = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(2, 128)];
// Line is invisible
line.hidden = YES;
// physicsBody of line
line.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:line.size];
// Position line...adjust this accordingly
line.position = CGPointMake(platform.position.x, platform.position.y+line.size.height/4);
[self addChild:line];
// Connect nodes with physics joint
[self connectNode1:platform toNode2:line];
[platform.physicsBody applyImpulse:CGVectorMake(100.0, 0)];
}
This method connects two sprite nodes, at their midpoint, with a physics joint.
- (void) connectNode1:(SKSpriteNode *)node1 toNode2:(SKSpriteNode *)node2
{
CGPoint midPoint = CGPointMake((node1.position.x + node2.position.x)/2,
(node1.position.y + node2.position.y)/2);
SKPhysicsJointFixed *joint = [SKPhysicsJointFixed jointWithBodyA:node1.physicsBody
bodyB:node2.physicsBody
anchor:midPoint];
[self.physicsWorld addJoint:joint];
}
Make the line a child of the object using the - (void)addChild:(SKNode *)node as referenced in the SKNode Class Reference.
If you do not want a child/parent relationship you can tie the line to the object like this:
line.position = CGPointMake(object.position.x+10, object.position.y+10)
where +10 is any value you need it to be. If the 'object' moves you will have to update the line's position during the update: method to keep track with the object's position.
In my iOS game, I am trying to move an object along a path (see below):
I want to move the triangle above around to the bottom of the box.
But I don't know how to use CGPathRefs very well. Here is what I am trying:
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddArc(path, NULL, 20, 0, 20, 0, M_PI/2, NO);
SKAction *moveTriangle = [SKAction followPath:path asOffset:YES orientToPath:YES duration:1.0];
[self.triangle runAction:moveTriangle];
And I keep getting odd results. Can anybody help me adjust my path to match the image above? Thanks!
Using prototypical's idea
// will arc around this sprite for demo
SKSpriteNode *boxOrange = [SKSpriteNode spriteNodeWithColor:[UIColor orangeColor] size:CGSizeMake(30, 30)];
boxOrange.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
[self addChild:boxOrange];
SKSpriteNode *heroSprite = [SKSpriteNode spriteNodeWithColor:[UIColor blueColor] size:CGSizeMake(70, 70)];
CGFloat offeset = 150; // change as required, ie bring hero closer to rotn point
heroSprite.position = CGPointMake(-offeset, heroSprite.position.y);
SKSpriteNode *guideContainer = [SKSpriteNode spriteNodeWithColor:[SKColor purpleColor] size:CGSizeMake(3, 3)];
// for full effect - change guide container to clearColor
// otherwise good for seeing where rotation point will occur
[guideContainer addChild:heroSprite];
[self addChild:guideContainer];
guideContainer.position = boxOrange.position;
[guideContainer runAction:[SKAction rotateToAngle:1.57 duration:3.0 shortestUnitArc:YES]];
// just found shortestUnitArc action .. this will be handy for at times