I am developing a game that uses the gyroscope to keep enemies in relatively the same place, with the following code:
if([motionManager isGyroAvailable])
{
[motionManager setGyroUpdateInterval:0.05];
[motionManager startGyroUpdatesToQueue:[NSOperationQueue mainQueue]
withHandler:^(CMGyroData *gyroData, NSError *error)
{
valueX3 = gyroData.rotationRate.y* 50;
valueY3 = gyroData.rotationRate.x* 50;
int newX3 = (int)(enemyufoG.center.x +valueY3);
int newY3 = (int)(enemyufoG.center.y -valueX3);
CGPoint newCenter2 = CGPointMake(newX3, newY3);
enemyufoG.center = newCenter2;
valueX2 = gyroData.rotationRate.y* 50;
valueY2 = gyroData.rotationRate.x* 50;
int newX2 = (int)(enemyufoR.center.x +valueY2);
int newY2 = (int)(enemyufoR.center.y -valueX2);
CGPoint newCenter = CGPointMake(newX2, newY2);
enemyufoR.center = newCenter;
valueX = gyroData.rotationRate.y* 50;
valueY = gyroData.rotationRate.x* 50;
int newX = (int)(enemyAlien.center.x +valueY);
int newY = (int)(enemyAlien.center.y -valueX);
CGPoint newCenter3 = CGPointMake(newX, newY);
enemyAlien.center = newCenter3;
}];
}
Once you shoot an enemy that is in the crosshairs of the gun, it hides the UIImageView, then uses NSTimer to call a different method that shows it again. I would like to have the enemies reappear in random positions on the screen.
CGPoint pos = enemyAlien.center;
if ((pos.x > 254) && (pos.x < 304) && (pos.y > 140) && (pos.y < 160 && _ammoCount != 0))
{
enemyAlien.hidden = YES;
[dangerBar setProgress:dangerBar.progress-0.10];
_killCount = _killCount+3;
[killCountField setText: [NSString stringWithFormat:#"%d", _killCount]];
timer = [NSTimer scheduledTimerWithTimeInterval: 4.0
target: self
selector: #selector(showAlien)
userInfo: nil
repeats: NO];
}
- (void) showAlien {
enemyAlien.hidden = NO;
}
When I try and use enemyAlien.center = enemyAlien.center + arc4random()%100; above enemyAlien.hidden = NO, I get the following error:
'Invalid operands to binary expression ('CGPoint (aka 'struct CGPoint') and 'unsigned int').
You're trying to add an integer to a cgpoint.
try this.
enemyAlien.center = CGPointMake(enemyAlien.center.x + (arc4random()%100),enemyAlien.center.y + (arc4random()%100));
although this will only move the alien in a diagonal direction. You should probably change it to the following for a better experience.
enemyAlien.center = CGPointMake((arc4random()%SCREEN_WIDTH),(arc4random()%SCREEN_HEIGHT));
where SCREEN_WIDTH and SCREEN_HEIGHT are the dimensions of your playing field.
Related
I have a small app that I have several sprite "balls" that move around the board using MotionManager.gravity.
I have code that when one of any of the balls meets an edge the stop at the edge. also if one of any of the balls gets to the corner it stops in the corner. I have also written code in which if two or three of the balls are on any one edge and touch each other (they have collision detection turned on) they stop in they maintain their relative position to the other ball.
Here is my code for that:
//this allocs the motionManager and set up the gravity values.
self.motionManager = [[CMMotionManager alloc] init];
self.motionManager.deviceMotionUpdateInterval = 0.005f;
self.motionQueue = [[NSOperationQueue alloc] init];
self.motionQueue.name = [[[NSBundle mainBundle] bundleIdentifier] stringByAppendingString:#".motion"];
self.updatePosition = NO;
[self.motionManager startDeviceMotionUpdatesToQueue:self.motionQueue withHandler:^(CMDeviceMotion *motion, NSError *error) {
#synchronized(self) {
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setMaximumFractionDigits:2];
[formatter setRoundingMode: NSNumberFormatterRoundUp];
{
_numberString = [formatter stringFromNumber:[NSNumber numberWithFloat:motion.gravity.x / 15.0 *200]];
_numberStringy = [formatter stringFromNumber:[NSNumber numberWithFloat:motion.gravity.y / 15.0 *200]];
n = [_numberString intValue];
y = [_numberStringy intValue];
}
self.gravity = motion.gravity;
self.updatePosition = YES;
}
}];
[self startDisplayLink];
//this shows how I stop the ball at the edge
- (void)handleDisplayLink:(CADisplayLink *)displayLink
{
#synchronized(self) {
if (!self.updatePosition)
return;
self.ball.position = CGPointMake(self.ball.position.x + (n*.99), self.ball.position.y + (y*.99));
self.ball2.position = CGPointMake(self.ball2.position.x + (n*.98), self.ball2.position.y +(y*.98));
self.ball3.position = CGPointMake(self.ball3.position.x + n, self.ball3.position.y + y);
if (ball.position.x <=340) {
ball.position = CGPointMake(340, ball.position.y);
}
if (ball.position.x >=684) {
ball.position = CGPointMake(684, ball.position.y);
}
if (ball.position.y <=148) {
ball.position = CGPointMake( ball.position.x,148);
}
if (ball.position.y >=620) {
ball.position = CGPointMake(ball.position.x,620);
}
//this stops it in the corner
if ( ball.position.x >=684 && ball.position.y <=148 ) {
ball.position = CGPointMake(684, 148);
}
if ( ball.position.x >=684 && ball.position.y >=620 ) {
ball.position = CGPointMake(684, 620);
}
if ( ball.position.x <=340 && ball.position.y <=148 ) {
ball.position = CGPointMake(340, 148);
}
if ( ball.position.x <=340 && ball.position.y >=620 ) {
ball.position = CGPointMake(340, 620);
}
//and this shows how I have set it up that if they are on one side and ball1 is in the corner and ball2 is next and ball3 is next they keep their relative positions. I thought if I set the corner ball and the rest had collision detection turned on they would just stop. They do but they push ball1 in the corner out of its position. So I wrote the code
if (ball2.position.y == ball3.position.y && ball.position.y == ball2.position.y && ball.position.x < ball2.position.x && ball2.position.x < ball3.position.x ) {
int s = (self.ball3.position.x - self.ball2.position.x);
int t = ((self.ball2.position.y - self.ball3.position.y));
k = t + s;
int f =(self.ball2.position.x - self.ball.position.x);
int g = ((self.ball2.position.y - self.ball.position.y));
j = f+g;
int h =(self.ball3.position.x - self.ball.position.x);
int i = ((self.ball3.position.y - self.ball.position.y));
l = h + i;
NSLog(#"ball2centerx:%f",ball2.position.x);
NSLog(#"ball2centery:%f",ball2.position.y);
NSLog(#"ballcenterx:%f",ball.position.x);
NSLog(#"ballcentery:%f",ball.position.y);
NSLog(#"ball3centerx:%f",ball3.position.x);
NSLog(#"ball3centery:%f",ball3.position.y);
CGPoint w = CGPointMake(340, 148);
CGPoint x = CGPointMake(340, 620);
CGPoint v = CGPointMake(684, 148);
CGPoint z = CGPointMake(684, 620);
CGPoint m = CGPointMake(370, 148);
CGPoint q = CGPointMake(370, 620);
CGPoint o = CGPointMake(654, 148);
CGPoint p = CGPointMake(654, 620);
if (CGPointEqualToPoint(ball.position,w) ) {
if (f < 30) {
ball2.position = CGPointMake(370, 148);
}
}
if (CGPointEqualToPoint(ball.position,x)) {
if (f<30) {
ball2.position = CGPointMake(370, 620);
}
}
if (CGPointEqualToPoint(ball3.position,v)) {
if (s <30){
ball2.position = CGPointMake(654, 148);
}
}
if (CGPointEqualToPoint(ball3.position,z)) {
if (s <30){
ball2.position = CGPointMake(654, 620);
}
}
if (CGPointEqualToPoint(ball2.position,m)) {
if (s <30){
ball3.position = CGPointMake(400, 148);
}
}
if (CGPointEqualToPoint(ball2.position,o)) {
if (f<30) {
ball.position = CGPointMake(624, 148);
}
}
if (CGPointEqualToPoint(ball2.position,q)) {
if (s <30){
ball3.position = CGPointMake(400, 620);
}
}
if (CGPointEqualToPoint(ball2.position,p)) {
if (f<30) {
ball.position = CGPointMake(624, 620);
}
}
}
The problem is that as I add more ball the code is going to become extremely complex.
is there a way to write it so that if one ball (any ball) is in the corner and another one is in position two it will stay there and so forth. Kind of like a generic code for all ball configuration. instead of writing it for every configuration?
If you are going to have a number of nodes in your scene, it becomes tedious and impractical to create a property for each one. A good solution is to create each node and add it into an array. The array will allow you to keep a reference to it. The important thing is to create each node with its own unique name. You can do this by creating a counter property.
#property (nonatomic) int myCounter;
Then when you create your node set the node's name property like this:
myCounter++;
myNode.name = [NSString stringWithFormat:#"myNode-%i",myCounter];
Once you have fully created the node, add it to a NSMutableArray like this:
[self.myArray addObject:myNode];
You can add as many nodes to the array as you need.
To enumerate through the array you can do this:
for (SKSpriteNode *object in myArray) {
// let's look for a node with the name of myNode-2
if([myNode.name isEqualToString:#"myNode-2"]) {
NSLog(#"Found it");
}
}
Here is an example to enumerate the array to check for each node's position and set its speed to zero dependent on the IF statement:
for (SKSpriteNode *object in myArray) {
if((object.position.x >= 300) && (object.position.y >= 300)) {
object.physicsBody.velocity = CGVectorMake(0, 0);
}
}
Remember that because you are storing the objects in your array as SKSpriteNodes and enumerating your array using SKSpriteNode, you have access to all the corresponding properties like speed, position, name, etc...
I am trying to make a jump game in Xcode 5 with SpriteKit.
First I want to spawn Blocks in a random position, but reachable for the 'human' in the game that is jumping.
I got a 1. Block, that spawn at a set position. From this position, there should spawn a 2. Block, that can be + or - 80 higher or lower, and < 80 away. Now here is the problem, I don`t know how to code it in Xcode. My code so far :
SKTexture * BlockTexture1 = [SKTexture textureWithImageNamed:#"Block"];
BlockTexture1.filteringMode = SKTextureFilteringNearest;
SKTexture * BlockTexture2 = [SKTexture textureWithImageNamed:#"Block"];
BlockTexture2.filteringMode = SKTextureFilteringNearest;
SKSpriteNode * Block1 = [SKSpriteNode spriteNodeWithTexture:BlockTexture1];
[Block1 setScale:1];
Block1.position = CGPointMake( 100 , 150 );
Block1.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:Block1.size];
Block1.physicsBody.dynamic = NO;
Block1.physicsBody.usesPreciseCollisionDetection = YES;
Block1.zPosition = 3;
[self addChild:Block1];
SKSpriteNode * Block2 = [SKSpriteNode spriteNodeWithTexture:BlockTexture2];
[Block2 setScale:1];
Block2.position = CGPointMake( **Block1 + or - 80, Block 1 < 80** );
Block2.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:Block2.size];
Block2.physicsBody.dynamic = NO;
Block2.physicsBody.usesPreciseCollisionDetection = YES;
Block2.zPosition = 3;
[self addChild:Block2];
To get your started, something like this perhaps:
int block1x = 100;
int block1y = 150;
Block1.position = CGPointMake(block1x, block1y);
int block2x = 0;
int block2y = 0;
int r1 = arc4random() % 2; // produces random numbers between 0 and 1
if(r1 == 0)
block2x = block1x + 80;
if(r1 == 1)
block2x = block1x - 80;
int r2 = arc4random() % 2;
if(r2 == 0)
block2y = block1y + 80;
if(r2 == 1)
block2y = block1y - 80;
Block2.position = CGPointMake(block2x, block2y);
Here some code for Add sprite for Enemies.....
_robbers = [[CCArray alloc] initWithCapacity:kNumAstroids];
for (int i = 0; i < kNumAstroids; ++i) {
CCSprite *asteroid = [CCSprite spriteWithSpriteFrameName:#"robber.png"];
asteroid.visible = NO;
[_batchNode addChild:asteroid];
[_robbers addObject:asteroid];
}
And in Update method ........
double curTime = CACurrentMediaTime();
if (curTime > _nextRunemanSpawn) {
float randSecs = [self randomValueBetween:0.20 andValue:1.0];
_nextRunemanSpawn = randSecs + curTime;
float randY = [self randomValueBetween:80 andValue:80];
float randDuration = [self randomValueBetween:4.5 andValue:4.5];
float randDuration1 = [self randomValueBetween:1.0 andValue:1.0];
CCSprite *asteroid = [_robbers objectAtIndex:_nextRobber];
_nextRobber++;
if (_nextRobber >= _robbers.count) {
_nextRobber = 1;
}
[asteroid stopAllActions];
asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , randY);
asteroid.visible = YES;
[asteroid runAction:[CCSequence actions:[CCMoveBy actionWithDuration:randDuration position:ccp(-winSize.width-asteroid.contentSize.width, 0)],
[CCCallFuncN actionWithTarget:self selector:#selector(setInvisible:)],nil]];
All Sprites are Move from right to left in screen
when Sprite crosses the middle of the screen it automatically disappear
what is the reason for this problem ??
I agree with the previously mentioned statement from LearnCocos2D. It is also possible that you are adding multiple objects and reaching the end of the capacity in the line
_robbers = [[CCArray alloc] initWithCapacity:kNumAstroids];
If you try to spawn more objects than whatever number you have specified for kNumAsteroids it will remove the oldest object and use the new one in its place. I.e. if kNumAsteroids is 5, you have 5 on the screen and then add a sixth, 1 will become 6 and its position will be whatever you set it to.
"Assertion failed: (m_bodyCount < m_bodyCapacity), function Add, file libs/Box2D/Dynamics/b2Island.h, line 65."
That is what it the crash leaves in the console.
[self removeChild:(CCSprite*)body->GetUserData() cleanup:YES];
body->SetTransform(b2Vec2(30, 30), 0); //moving the body out of the scene so it doesnt collide anymore!
world->DestroyBody(body);
I think im doing the right stuff..
#property (nonatomic, assign) b2Body *body;
Here is how i "make it" a property
I dont understand why it doesnt work, "body" is a proper pointer because I can retrieve infromation from the bodys UserData like tags that are set in the creatin of the body, so that shouldnt be a problem.. Do anyone know whats wrong with my code?
Thank you.
Edited in:
-(void) tick: (ccTime) dt //Main loop
{
if (ballFired) {
Magnet *aMagnet = [magnetArray objectAtIndex:0];
world->DestroyBody(aMagnet.body); //It crashes here!
}
int32 velocityIterations = 8;
int32 positionIterations = 1;
// Instruct the world to perform a single step of simulation. It is
// generally best to keep the time step and iterations fixed.
world->Step(dt, velocityIterations, positionIterations);
//Iterate over the bodies in the physics world
for (b = world->GetBodyList(); b; b = b->GetNext())
{
if (b->GetUserData() != NULL) {
//Synchronize the AtlasSprites position and rotation with the corresponding body
CCSprite *myActor = (CCSprite*)b->GetUserData();
myActor.position = CGPointMake( b->GetPosition().x * PTM_RATIO, b>GetPosition().y * PTM_RATIO);
myActor.rotation = -1 * CC_RADIANS_TO_DEGREES(b->GetAngle());
}
}
}
Isnt this outside the world step?
Edit 2:
ContactListener::ContactListener(){};
void ContactListener::BeginContact(b2Contact* contact)
{
// Box2d objects that collided
b2Fixture* fixtureA = contact->GetFixtureA();
b2Fixture* fixtureB = contact->GetFixtureB();
CCSprite* actorA = (CCSprite*) fixtureA->GetBody()->GetUserData();
CCSprite* actorB = (CCSprite*) fixtureB->GetBody()->GetUserData();
if(actorA == nil || actorB == nil) return;
b2WorldManifold* worldManifold = new b2WorldManifold();
contact->GetWorldManifold(worldManifold);
Kollisjon *kollisjon = [Kollisjon sharedKollisjon];
if (actorA.tag == 1) {
NSLog(#"OK1");
kollisjon.kollidertBody = fixtureB->GetBody();
kollisjon.world->DestroyBody(kollisjon.kollidertBody); //Isnt this ok?
}
else if (actorB.tag == 1) {
NSLog(#"OK2");
kollisjon.kollidertBody = fixtureA->GetBody();
kollisjon.world->DestroyBody(kollisjon.kollidertBody); //Isnt this ok?
}
}
Is it not outside the timestep? Please help me here...
Thank you
You must scan for contacts, store all contacts in an array, and then AFTER all contacts have been checked, you remove your bodies.
Checking for contacts:
std::vector<MyContact>::iterator pos;
for(pos = _contactListener->_contacts.begin();
pos != _contactListener->_contacts.end(); ++pos)
{
MyContact contact = *pos;
b2Body *bodyA = contact.fixtureA->GetBody();
b2Body *bodyB = contact.fixtureB->GetBody();
// Rocket explosion rect
if(bodyA->GetUserData() == NULL)
{
NSLog(#"NULL collision detected. (BODY A)");
hasDoneRocketCollisions = YES;
CCSprite *sprite = (CCSprite*) bodyB->GetUserData();
if(sprite.visible == NO) continue;
if(sprite.tag >= 200 && sprite.tag < 300)
{
index = sprite.tag - 200;
if([spriteTracker containsObject:sprite]) continue;
[spriteTracker addObject:sprite];
bodiesToKill[counter] = bodyB;
[enemyChargerIsAlive replaceObjectAtIndex:(int)(sprite.tag-200) withObject:[NSNumber numberWithInt:0]];
[ParticleController spawnExplosion:sprite.position inParent:currentDefaultNode];
}
else if(sprite.tag >= 300 && sprite.tag < 400)
{
index = sprite.tag - 300;
if([spriteTracker containsObject:sprite]) continue;
[spriteTracker addObject:sprite];
bodiesToKill[counter] = bodyB;
[enemyShooterIsAlive replaceObjectAtIndex:(int)(sprite.tag-300) withObject:[NSNumber numberWithInt:0]];
[ParticleController spawnExplosion:sprite.position inParent:currentDefaultNode];
counter++;
}
}
}
Later in your method after all contacts have been checked:
b2Body *dyingBody;
for(int i = 0; i < counter; i++)
{
CCSprite *dyingSprite;
dyingSprite = [spriteTracker objectAtIndex:i];
dyingSprite.visible = NO;
// Is player projectile
if(dyingSprite.tag >= 100 && dyingSprite.tag < 200)
{
CCParticleSystemQuad *dyingParticle;
dyingParticle = [particlesToKill objectAtIndex:particleIndex];
particleIndex++;
[dyingParticle stopSystem];
dyingBody = bodiesToKill[i];
dyingBody->SetActive(false);
[ParticleController spawnExplosion:dyingSprite.position inParent:currentDefaultNode];
[AudioController playExplosion];
dyingSprite.visible = NO;
if([_player currentShotType] == 1)
{
rocketHitBody->SetTransform(b2Vec2(dyingSprite.position.x/PTM_RATIO, dyingSprite.position.y/PTM_RATIO), 0.0);
rocketHitBody->SetActive(true);
}
}
}
Take note that these are just random chunks of code I have copy and pasted in. They are for example only and may only confuse you if you try to read them as exact instructions.
The point here is: You can not remove a body while it is being accessed by the step or contact listener. Finish using the contact listener and then remove your bodies.
Ok, so I have these powerups that I want to slow/speed up the movement of the other objects in the game for a few seconds.
I have an array of objects that I have a variable called spawnInterval that gets faster and faster as the game progresses, making the ame get harder after a few mins.
But I can't really grasp how to make it so the character in the game will react differently to different objects as in when the fastPowerUp is hit by the character sprite, the spawn interval doesn't change.
And vice versa with the slowPowerUp.
the code I have at the moment is this in a move sequence method that gets called in an update method:
-
(void) updateObstacles:(ccTime)delta{
for (int i = 0; i < 20; i++) {
//int randomizer = CCRANDOM_0_1() * [obstacles count];
//NSLog(#"randomizer: %i",randomizer);
CCSprite* randomObject = [obstacles randomObject];
currentObject = [obstacles indexOfObject:randomObject];
if ([randomObject numberOfRunningActions] == 0) {
[self runObstacleMoveSequence:randomObject withTimer:delta];
break;
}
}
}
-(void) runObstacleMoveSequence:(CCSprite *)object withTimer:(ccTime)delta{
static int time;
//Slowly increase object speed
numObstaclesMoved++;
if (!slowPowerUp && !fastPowerUp) {
time += delta;
if (numObstaclesMoved % 17 == 0 && obstacleMoveDuration > 2.0f) {
obstacleMoveDuration -= 0.2f;
if (spawnInterval > 0.1f) {
[self unschedule:#selector(updateObstacles:)];
[self schedule:#selector(updateObstacles:) interval:spawnInterval];
spawnInterval-=0.1f;
NSLog(#"interval: %f",spawnInterval);
}
}
}else if (slowPowerUp && !fastPowerUp) {
if (numObstaclesMoved % 17 == 0 && obstacleMoveDuration > 2.0f) {
obstacleMoveDuration += 3.0f;
if (spawnInterval > 0.1f) {
[self unschedule:#selector(updateObstacles:)];
[self schedule:#selector(updateObstacles:) interval:spawnInterval];
spawnInterval-=0.1f;
NSLog(#"interval: %f",spawnInterval);
if (time >= (delta + 3)) {
slowPowerUp = NO;
obstacleMoveDuration -= 3.0f;
}
}
}
}else if (!slowPowerUp && fastPowerUp) {
if (numObstaclesMoved % 17 == 0 && obstacleMoveDuration > 2.0f) {
obstacleMoveDuration -= 3.0f;
if (spawnInterval > 0.1f) {
[self unschedule:#selector(updateObstacles:)];
[self schedule:#selector(updateObstacles:) interval:spawnInterval];
spawnInterval-=0.1f;
NSLog(#"interval: %f",spawnInterval);
if (time >= (delta + 3)) {
fastPowerUp = NO;
obstacleMoveDuration += 3.0f;
}
}
}
}
CGSize screenSize = [[CCDirector sharedDirector]winSize];
CGPoint aboveScreenPosition = CGPointMake(object.position.x, screenSize.height - object.position.y);
int rotations = (CCRANDOM_0_1()*3) * 360;
float duration = (CCRANDOM_0_1()*5.0f) + 8.0f;
CCMoveTo* move = [CCMoveTo actionWithDuration:obstacleMoveDuration position:aboveScreenPosition];
CCRotateTo* rotate = [CCRotateBy actionWithDuration:duration angle:rotations];
CCSpawn* moveRotate = [CCSpawn actions: move, rotate, nil];
CCCallFuncN* call = [CCCallFuncN actionWithTarget:self selector:#selector(objectAboveScreen:)];
CCSequence* sequence = [CCSequence actions:moveRotate, call, nil];
[object runAction:sequence];
if (time >= (delta + 3)) {
fastPowerUp = NO;
}
}
-(void) objectAboveScreen:(id) sender{
//make sure sender is actually of the right class
NSAssert([sender isKindOfClass:[CCSprite class]], #"sender is not a CCSprite!");
CCSprite* obstacle = (CCSprite*)sender;
//move the back to the bottom of the screen
CGPoint pos = obstacle.position;
CGSize screenSize = [[CCDirector sharedDirector]winSize];
pos.y = (-screenSize.height - [obstacle texture].contentSize.height);
pos.x = CCRANDOM_0_1() * screenSize.width;
obstacle.position = pos;
}
I really just don't know where to go from here... Should I make the powerUps a different class? If so, how would I implement something like this? I really hate trying to ask for someone to solve my question, but I really just can't rack my brain around this and I'm rather new... if it were explained to me, then I know I would be able to implement it in future games on my own...
Thanks in advance, and let me know if more information is needed...
I'd do something like
in the .h file
float speedModifier;
-(void)resetPowerUp;
in the .m
-(void)resetPowerUp
{
speedModifier = 1;
}
wherever you are initializing the level
[self resetPowerUp];
upon collision with powerup:
speedModifier = 2;
[self performSelector:#selector(resetPowerUp) withObject:nil afterDelay:5];
then wherever you are moving whatever it is which speed should be effected by the powerup mode, multiply the speed of the animation (or divide the duration it takes for it to get wherever it's going) by speedModified
hope that helps