I am new to cocos2d so please help me if u can
I have background moving from right to left, and the background contains small windows with 3 rows of windows
_spaceDust1 = [CCSprite spriteWithFile:#"bg_front_spacedust.png"];
_spaceDust2 = [CCSprite spriteWithFile:#"bg_front_spacedust.png"];
CGPoint dustSpeed = ccp(0.1 , 0.1);
CGPoint bgSpeed = ccp(0.05 , 0.05);
[_backgroundNode addChild:_spaceDust1 z:0 parallaxRatio:dustSpeed positionOffset:ccp(0,winSize.height / 2)];
[_backgroundNode addChild:_spaceDust2 z:0 parallaxRatio:dustSpeed positionOffset:ccp(_spaceDust1.contentSize.width , winSize.height / 2)];
Now add enemies wich also move from right to left with same speed
_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];
}
in update method:
double curTime = CACurrentMediaTime();
if (curTime > _nextRunemanSpawn) {
float randSecs = [self randomValueBetween:0.20 andValue:1.0];
_nextRunemanSpawn = randSecs + curTime;
float randY = 80.0;
float randY1 = 185.0;
float randY2 = 293.0;
float randDuration = [self randomValueBetween:5.2 andValue:5.2];
float randDuration1 = [self randomValueBetween:1.0 andValue:1.0];
CCSprite *asteroid = [_robbers objectAtIndex:_nextRobber];
_nextRobber++;
if (_nextRobber >= _robbers.count) {
_nextRobber = 0;
}
//[asteroid stopAllActions];
int winChoice = arc4random() % 3;
if (winChoice == 0) {
asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , randY);
asteroid.visible = YES;
}
else if(winChoice == 1){
asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , randY1);
asteroid.visible = YES;
}else {
asteroid.position = ccp(winSize.width +asteroid.contentSize.width / 2 , randY2);
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 is going well but i want to set this enemies in to window and in random position
so how can i set x-argument of enemies so it can be fix in to window of the background?
For some reason I cannot comment so this is written as an answer. What exactly are you trying to do? I am a bit confused. It sounds like you want the X position to be set so that it is in one of 3 random positions, is that correct?
Related
I have a sprite and I want to move it to random points forever. I have written this code, but I don't think it is efficient.
-(void)addBoss {
SKSpriteNode *boss = [SKSpriteNode spriteNodeWithImageNamed:#"Spaceship"];
boss.position = CGPointMake(self.size.width + boss.size.width / 2.0, self.size.height / 2.0);
boss.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:boss.size];
boss.physicsBody.dynamic = YES;
boss.physicsBody.categoryBitMask = bossCategory;
boss.physicsBody.contactTestBitMask = bossContact;
boss.physicsBody.collisionBitMask = 0;
boss.zPosition = 1;
self.boss = boss;
self.bossHealth = bossHP;
CGPoint destination = CGPointMake(self.size.width - boss.size.width / 2.0, boss.position.y);
float time = length(boss.position, destination) / bossSpeed;
SKAction *move = [SKAction moveTo:destination duration:time];
[self addChild:boss];
[self.boss runAction:[SKAction sequence:#[move, [SKAction runBlock:^{
[self artificialIntelligence];
}]]]];
}
- (void)moveBoss {
float minimumX = self.size.width / 2.0 + self.boss.size.width / 2.0;
float maximumX = self.size.width - self.boss.size.width / 2.0;
float minimumY = self.boss.size.height / 2.0;
float maximumY = self.size.height - self.boss.size.height / 2.0;
int rangeX = maximumX - minimumX;
int rangeY = maximumY - minimumY;
float x = arc4random() % rangeX + minimumX;
float y = arc4random() % rangeY + minimumY;
CGPoint dest = CGPointMake(x, y);
float duration = length(self.boss.position, dest) / putinSpeed;
[self.boss runAction:[SKAction moveTo:dest duration:duration] completion:^{
[self moveBoss];
}];
}
-(void)artificialIntelligence {
[self moveBoss];
}
This code works fine, but I don't think that calling the move method recursively after movement finished is not the best solution.
What is the best way to solve this kind of problem?
This is a quick and dirty way to do what you asked:
-(void)moveCharacter {
SKNode *playerNode;
// get random position
CGPoint destination = [self randomPosition];
if(!CGPointEqualToPoint(playerNode.position, destination)) {
// check xPos
if(playerNode.position.x > destination.x) {
playerNode.position = CGPointMake(playerNode.position.x-1, playerNode.position.y);
}
if(playerNode.position.x < destination.x) {
playerNode.position = CGPointMake(playerNode.position.x+1, playerNode.position.y);
}
// check yPos
if(playerNode.position.y > destination.y) {
playerNode.position = CGPointMake(playerNode.position.x, playerNode.position.y-1);
}
if(playerNode.position.y < destination.y) {
playerNode.position = CGPointMake(playerNode.position.x, playerNode.position.y+1);
}
} else {
destinationReached = YES;
}
}
-(CGPoint)randomPosition {
CGRect screenRect = [[UIScreen mainScreen] bounds];
int xPos = arc4random() % (int)screenRect.size.width;
int yPos = arc4random() % (int)screenRect.size.height;
return CGPointMake(xPos, yPos);
}
There are many different variations on how to move your character. You could for example divide the difference of x,y into a fixed number of movements as to have the player move in a smooth line from point A to B. If you are physics to move your player, you would have to use CGVector instead of directly changing his x,y position.
In my app, I have an image that acts as the ground, and scrolls along the bottom. I initialize and scroll it with:
-(void)initalizingScrollingBackground
{
for (int i = 0; i < 2; i++)
{
SKSpriteNode *bg = [SKSpriteNode spriteNodeWithImageNamed:#"Bottom_Scroller"];
bg.zPosition = BOTTOM_BACKGROUND_Z_POSITION;
bottomScrollerHeight = bg.size.height;
bg.position = CGPointMake((i * bg.size.width) + (bg.size.width * 0.5f) - 1, bg.size.height * 0.5f);
bg.name = #"bg";
bg.physicsBody = [SKPhysicsBody bodyWithTexture:bg.texture size:bg.texture.size];
bg.physicsBody.categoryBitMask = bottomBackgroundCategory;
bg.physicsBody.contactTestBitMask = flappyBirdCategory;
bg.physicsBody.collisionBitMask = 0;
bg.physicsBody.affectedByGravity = NO;
[self addChild:bg];
}
}
- (void)moveBottomScroller
{
[self enumerateChildNodesWithName:#"bg" usingBlock: ^(SKNode *node, BOOL *stop)
{
SKSpriteNode * bg = (SKSpriteNode *) node;
CGPoint bgVelocity = CGPointMake(-BG_VELOCITY, 0);
CGPoint amtToMove = CGPointMultiplyScalar(bgVelocity,_dt);
bg.position = CGPointAdd(bg.position, amtToMove);
//Checks if bg node is completely scrolled of the screen, if yes then put it at the end of the other node
if (bg.position.x + bg.size.width * 0.5f <= 0)
{
bg.position = CGPointMake(bg.size.width*2 - (bg.size.width * 0.5f) - 2,
bg.position.y);
}
}];
}
However, after it scrolls for so long, it shows a gap in it, as shown below. How can I fix this?
What I'd do is:
// This would go in the init or didMoveToView method of your scene
const NSUInteger numBgs = 3;
for (NSUInteger i = 0; i < numBgs; i++) {
CGFloat color = 0.2f * i;
SKSpriteNode *bg = [SKSpriteNode spriteNodeWithColor:[UIColor colorWithRed:color green:color blue:color alpha:1.0] size:CGSizeMake(512, 300)];
bg.anchorPoint = CGPointMake(0.5, 0);
bg.position = CGPointMake((i * bg.size.width) + (bg.size.width * 0.5f), CGRectGetMinY(self.frame));
bg.name = #"bg";
[self addChild:bg];
if (i == numBgs-1) { // Means it's last bg on the right
lastBg = bg;
}
}
[self enumerateChildNodesWithName:#"bg" usingBlock:^(SKNode *node, BOOL *stop) {
SKSpriteNode * bg = (SKSpriteNode *) node;
//Checks if bg node is completely scrolled of the screen, if yes then put it at the end of the other node
if (bg.position.x + bg.size.width * 0.5f <= 0)
{
bg.position = CGPointMake(lastBg.position.x + bg.frame.size.width,
bg.position.y);
lastBg = bg;
}
CGPoint bgVelocity = CGPointMake(-BG_VELOCITY, 0);
CGPoint amtToMove = CGPointMultiplyScalar(bgVelocity,_dt);
bg.position = CGPointAdd(bg.position, amtToMove);
}];
Where lastBg is an instance variable that points to the bg located at the top most right so that re-positioning is always going to be relative to this sprite.
Other things you can try are switching the check of the position before the re-positioning (as I did in the example) and also remove the check out of the enumerate block and do it independently of the re-positioning.
I used to do like in the example and it worked fine. Let me know how it does.
I am trying to make an iPhone game and I am trying to add random images in different position.
Here is what I want to do
There is 6 different color oval nodes (enemy)
When the game starts I want there to be 5 enemy nodes.
When the player node contacts enemy node, enemy node will disappear and then right away another
enemy node will be added in different location.
But some times some nodes appear in same location so it looks like there is 4 nodes instead of 5.
If there is a node already in a specific location how can I not add another node there but some other location?
Below I added a part of the code I wrote.
It might be something very easy but I am new to programming and I could not figure that out.
Thank you,
-(void) addWaterBall {
for (int i = 0; i < 5; i++) {
NSUInteger randomWaterBall = [Util randomWithMin:0 max:8];
WaterBall *waterBall = [WaterBall waterBallOfType:randomWaterBall];
float y = self.frame.size.height - ((((self.frame.size.height/2)-10)/10) * [Util randomWithMin:1 max:10]);
float x = (self.frame.size.width/10) * [Util randomWithMin:1 max:10];
waterBall.position = CGPointMake(x, y);
waterBall.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:waterBall.size.width/2];
waterBall.physicsBody.dynamic = YES;
waterBall.physicsBody.affectedByGravity = NO;
waterBall.physicsBody.categoryBitMask = waterBallCategory;
waterBall.physicsBody.contactTestBitMask = sharkCategory ;
//waterBall.physicsBody.collisionBitMask = ;
[self addChild:waterBall];
}
}
What I would do is stick in a [self enumerateChildNodesWithName…….] after generating the random co-ordinates and compare the random x and y co-ordinates with those on each enumerated node, if they are the same or too close then generate new random co-ordinates. This is probably best done in a while loop.
-(void)addWaterBall
{
NSUInteger randomWaterBall = [Util randomWithMin:0 max:8];
WaterBall *waterBall = [WaterBall waterBallOfType:randomWaterBall];
waterBall.name = #"WaterBall";
[self enumerateChildNodesWithName:#"WaterBall" usingBlock:^(SKNode *node, BOOL *stop) {
float y = self.frame.size.height - ((((self.frame.size.height/2)-10)/10) * [Util randomWithMin:1 max:10]);
float x = (self.frame.size.width/10) * [Util randomWithMin:1 max:10];
node.position = CGPointMake(x, y);
node.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:waterBall.size.width/2];
node.physicsBody.dynamic = YES;
node.physicsBody.affectedByGravity = NO;
node.physicsBody.categoryBitMask = waterBallCategory;
node.physicsBody.contactTestBitMask = sharkCategory ;
//waterBall.physicsBody.collisionBitMask = ;
[self addChild:waterBall];
}];
}
So I'm trying to just recreate a bouncing ball app using xcode and C4. What I'm trying to do right now is re-create some of the examples in Dan Shiffmans Nature of Code book in C4.
So far I've managed to create my own class of "Mover" objects that bounce around the screen. That's all working great. The next step was to start "applying some forces" to the movers and play around with that.
I seem to be getting an exception thats crashing the program now that I've added methods to apply force. I put on exception breakpoints and this line in C4Control.m is where it stops:
if(_animationDuration == 0.0f) super.center = center;
Looking into this more, I notice that neither super.center or center properties have a value assigned to them (both of NaN). I'm not sure what's causing this? This seemed to start once I decided to set each Movers initial velocity/accel to 0 and only assign "fores" (C4Vectors for wind and gravity) to create motion in these objects. When I comment out the 2 lines that apply each force, the problem goes away.
This is the implementation of my mover class:
//Init Method
- (id)initWithPoint:(CGPoint)point andCanvasController:(C4CanvasController *)canvasController {
self = [super init];
if (self) {
canvasFrame = CGPointMake(canvasController.canvas.width,
canvasController.canvas.height);
diam = [C4Math randomInt:70];
mass = diam * 0.5f;
CGRect ellipseFrame = CGRectMake(0, 0, diam, diam);
[self ellipse:ellipseFrame];
self.lineWidth = 0.0f;
self.fillColor = [UIColor colorWithRed:[C4Math randomInt:60]/60
green:[C4Math randomInt:100]/100.0f
blue:0.9f
alpha:0.3f];
int foo = arc4random() % (int)([canvasController.canvas height]);
int bar = arc4random() % (int)([canvasController.canvas width]);
self.location = [C4Vector vectorWithX:foo
Y:bar
Z:0.0f];
self.origin = self.location.CGPoint;
self.accel = [C4Vector vectorWithX:0.00f Y:0.0f Z:0.0f];
self.vel = [C4Vector vectorWithX:0.00f Y:0.0f Z:0.0f];
}
return self;
}
//Method to calculate updated mover position
-(void)update{
[self.vel add:self.accel];
[self.location add:self.vel];
self.origin = self.location.CGPoint;
[self.accel multiplyScalar:0];
[self checkBounds];
}
//Checking if mover has reached edge of screen
-(void)checkBounds{
if (self.origin.x > canvasFrame.x - diam){
self.location.x = canvasFrame.x - diam;
self.vel.x *= -1;
}
else if (self.origin.x < 0){
self.vel.x *= -1;
self.location.x = 0;
}
if(self.origin.y > canvasFrame.y - diam){
self.location.y = canvasFrame.y - diam;
self.vel.y *= -1;
}
else if(self.origin.y < 0){
self.vel.y *= -1;
self.location.y = 0;
}
}
//Start C4Timer to run update every 1/60th of a second
- (void) run{
updateTimer = [C4Timer automaticTimerWithInterval:1/60.0f
target:self
method:#"update"
repeats:YES];
}
//Calculate a force to apply to mover
- (void)applyForce:(C4Vector *)force{
[force divideScalar:mass];
[self.accel add:force];
}
In my C4WorkSpace.m file:
#import "C4Workspace.h"
#import "Mover.h"
#implementation C4WorkSpace{
Mover *testMover;
NSMutableArray *moverArray;
}
-(void)setup {
C4Vector *gravity = [C4Vector vectorWithX:0.01f Y:0.0 Z:0.0f];
C4Vector *wind = [C4Vector vectorWithX:0 Y:0.4 Z:0];
moverArray = [[NSMutableArray alloc]init];
//Not using foo/bar variables right now, but usually use them to create CGPoint p
//int foo = arc4random() % (int)([self.canvas height]);
//int bar = arc4random() % (int)([self.canvas width]);
for (int i = 0; i < 500; i++) {
CGPoint p = CGPointMake(0,0);
Mover *m = [[Mover alloc]initWithPoint:p andCanvasController:self];
[moverArray addObject:m];
}
for (Mover *m in moverArray){
[self addShape:m];
[m run];
[m applyForce:gravity];
[m applyForce:wind];
}
}
#end
Sorry for how long this was, any and all help is much appreciated!
I'm new to cocos2d. I'm writing my first app. But I have a problem I can't solve it. The problem is that when I move multiple sprites, the others are OK except the last one. I want my sprites will run actions at the same time. But I don't know how to fix it. Any ideas or advice about promoting my code. Thanks.
Here's my code.
-(void) setHeadFace:(Face *)headFace moveFrom:(CGPoint)startPosition moveTo:(CGPoint)endPosition`
{
CCMoveTo *moveOut = [CCMoveTo actionWithDuration:0.2f position:startPosition];
CCScaleTo *scaleTo = [CCScaleTo actionWithDuration:0.2f scale:0.0f];
CCSpawn *moveFrom = [CCSpawn actions:moveOut,scaleTo,nil];
CCMoveTo *moveTo = [CCMoveTo actionWithDuration:0.0f position:endPosition];
CCSequence *headAction = [CCSequence actions:moveFrom,moveTo,nil];
[headFace.faceSprite runAction:headAction];
}
-(void) setMidlFace:(Face *)curtFace moveTo:(CGPoint)movePosition nextFace:(Face *)nextFace
{
CCMoveTo *moveTo = [CCMoveTo actionWithDuration:0.2f position:movePosition];
CCSequence *moveAction = [CCSequence actions:moveTo,nil];
[curtFace.faceSprite runAction:moveAction];
nextFace.faceSprite = curtFace.faceSprite;
nextFace.faceType = curtFace.faceType;
[nextFace.faceSprite setPosition:movePosition];
}
-(void) setTailFace:(Face *)tailFace moveTo:(CGPoint)movePosition
byGuardSprite:(CCSprite *)guardSprite`
{
CCDelayTime *delay = [CCDelayTime actionWithDuration:0.2f];
CCMoveTo *moveIn = [CCMoveTo actionWithDuration:0.2f position:movePosition];
CCScaleTo *scaleTo = [CCScaleTo actionWithDuration:0.2f scale:1.0f];
CCSpawn *moveTo = [CCSpawn actions:moveIn,scaleTo,nil];
CCCallBlock *touchBlock =[CCCallBlock actionWithBlock:^{
tailFace.faceSprite = guardSprite;
tailFace.faceType = guardSprite.tag;
tailFace.faceSprite.tag = -1;
isTouch = YES;
}];
CCSequence *tailAction=[CCSequence actions:delay,moveTo,touchBlock,nil];
[guardSprite runAction:tailAction];
}
-(void) moveFaces:(Face *)face direction:(int)direction`
{
CCSprite *guardSprite = nil;
CGPoint movePosition;
CGPoint curtPosition;
CGPoint startPosition;
CGPoint endPosition;
int x = face.cdX;
int y = face.cdY;
CGFloat width = faceGrid[x][0].position.x;
CGFloat height = faceGrid[0][y].position.y;
switch (direction) {
case MOVE_DOWN:
CCLOG(#"move down:direction %d", direction);
movePosition = CGPointMake(width,faceGrid[x][0].position.y);
//move the first face out of the grid
startPosition = CGPointMake(width,faceGrid[x][0].position.y-GRID_OFFSET.y/2);
endPosition = CGPointMake(width,faceGrid[x][GRID_HEIGHT-1].position.y+GRID_OFFSET.y/2);
[self setHeadFace:faceGrid[x][0] moveFrom:startPosition moveTo:endPosition];
guardSprite = faceGrid[x][0].faceSprite;
guardSprite.tag = faceGrid[x][0].faceType;
for (int j=1; j<GRID_HEIGHT; j++)
{
curtPosition=CGPointMake(width,faceGrid[x][j].position.y);
//move the middle face to the next face
[self setMidlFace:faceGrid[x][j] moveTo:movePosition nextFace:faceGrid[x][j-1]];
movePosition = curtPosition;
}
//use the guard face to set the last face's move action
[self setTailFace:faceGrid[x][GRID_HEIGHT-1] moveTo:movePosition byGuardSprite:guardSprite];
break;
......
}
I used tick function for same purpose.
-(void)onEnter
{
[super onEnter];
self.isTouchEnabled = true;
[self schedule: #selector(tick:)];
}
-(void) tick: (ccTime) dt
{
CGPoint pos = head.position ;
head.position = ccp(pos.x+gameSpeed, pos.y);
pos = tail.position ;
tail.position = ccp(pos.x+gameSpeed, pos.y);
}