i followed this wonderful guide about mario-style game:
http://www.raywenderlich.com/62053/sprite-kit-tutorial-make-platform-game-like-super-mario-brothers-part-2
however, i wanted to convert the movement controls to arrow keys, implemented by SKSpriteNodes with names that are detected by:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch* touch = [touches anyObject];
CGPoint location = [touch locationInNode:self];
SKNode* node = [self nodeAtPoint:location];
// other left, up, down arrows with same code here
if ([node.name isEqualToString:#"rightArrow"]) {
self.player.moveRight = YES;
self.rightOriginalTouchLocation = location;
...
}
}
self.player.moveRight is a boolean value (much like moveForward in the guide), that tells the character at update to move.
it is terminated at:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch* touch = [touches anyObject];
CGPoint location = [touch locationInNode:self];
SKNode* node = [self nodeAtPoint:location];
// other left, up, down arrows with same code here
if ([node.name isEqualToString:#"rightArrow"]) {
self.player.moveRight = NO;
}
...
}
however, i encounter the following problem - when i start the touch on the arrow, drag it outside the arrow, and then release the tap, it is not recognized as 'touch ended' for the arrow node (and it doesn't stop moving because of that).
i tried to solve it in many ways (even calculating touch move distance from original location and see if its too far, then cancel movement), but i always manage to reproduce the constant motion problem.
the issue lies with the fact that i can tap two arrows at the same time, so it is not enough to remember the last node tapped.
since i want to allow movement for different directions at the same time, i cant stop all movements in case one button is dismissed. i need to specifically know which button was released so i can stop that direction's movement only.
do you have any ideas for me? should i implement it in another way considering i want the arrow keys, or is there a method to detect which node is released even though it is not at its original location (of the tap)?
Thank you very much!
if anyone is interested about the issue - i had a problem where touching and moving from SKSpriteNode didnt call the touchesEnded for that SKSpriteNode (since the 'release' of the touch was not in the node).
i solved it by keeping the CGPoint of the touch at touchesBegan, and when touchesEnded called, i calculated distances to nearest key using simple distance function:
-(int)calculateDistanceWithPoints:(CGPoint)point1 andPoint:(CGPoint)point2 {
float d = sqrtf(pow((point1.x - point2.x), 2) + pow((point1.y - point2.y), 2));
return (int)d;
}
and then, in touchesEnded, i checked to which key the distance is minimal(i have 3 keys, so which key is most likely to be the key that was 'released') - and did the action required for that key release.
Related
So I'm trying to implement a method into a game where if a player has their finger touching the screen at lets say 50 on the y axis or lower, an SKAction will run to move the character sprite down, and if their finger is touching above the 50, another action will run moving the sprite up. I don't know how you have it recognize a touch and hold though. Help please.
You will need to capture the touch event of the user in order to pull this off. I suggest checking out the excellent tutorial provided by RayWenderlich at: Animating Textures and Moving Them With Touch Events
If you don't have time for that this is what your code might look like:
First the knowledge that you will need is that the two most generic touch events are the:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
and the:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
Basically the touches began method is called when the user places their finger on the screen whereas the touches ended method will be triggered when the user takes their finger off the screen.
For this example I will use touchesEnded, but feel free to change it if you want, its as easy as switching the "Ended" with "Began".
All of the code I am about to show you will take place within the scenes implementation file:
If you just want the sprite to move up when above a certain point and down when below a certain point use the following:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
//capture the location of the touch
CGPoint location = [[touches anyObject] locationInNode:self];
//used to hold the location to travel
CGPoint moveLocation;
//check if the Y location is less than 50
if(location.y < 50)
{
//the the location to the bottom of the screen
moveLocation = CGPointMake(sprite.position.x, 0);
}
//and then if its more than 50
else
{
//set the locaiton to the top of the screen
moveLocation = CGPointMake(sprite.position.x, self.frame.size.height);
}
//move the sprite
//Check if their already moving
if(sprite actionForKey:#"moving")
{
//If they are stop them so they can move in the new direction
[sprite removeActionForKey:#"moving"];
}
SKAction *moveAction = [SKAction moveTo:location duration:5.0f];
//remember to give the action a key so that we can check for it during the above if statement
[sprite runAction:moveAction withKey:#"moving"];
}
And there you have it. The only flaw is that it will always take 5 seconds to reach the location regardless of your distance from it, read on if you would like hints on how to correct that, or if you would like to see how to make the sprite travel to any touched location on the screen.
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
//capture the location of the touch
CGPoint location = [[touches anyObject] locationInNode:self];
//move the sprite
//Check if their already moving
if(sprite actionForKey:#"moving")
{
//If they are stop them so they can move in the new direction
[sprite removeActionForKey:#"moving"];
}
SKAction *moveAction = [SKAction moveTo:location duration:5.0f];
//remember to give the action a key so that we can check for it during the above if statement
[sprite runAction:moveAction withKey:#"moving"];
}
That code will make it so that for 5 seconds the sprite will move to the location touched on the screen. Just remember to replace the instances of "sprite" with the name of your SKSpriteNode variable. For more complex movement try the following:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
//capture the location of the touch
CGPoint location = [[touches anyObject] locationInNode:self];
//set the velocity of the subject
float velocity = self.frame.size.width/3.0;
//The above will ensure that it will take the sprite 3 seconds to travel the distance of the screen
//Determine the difference between the point touched and the sprites position
CGPoint moveDifference = CGPointMake(location.x - sprite.position.x, location.y - sprite.position.y);
//Use pythagorean theorem to figure out the actual length to move
float distanceToMove = sqrtf(moveDifference.x * moveDifference.x + moveDifference.y*moveDifference.y);
//Use the distance to travel and the velocity to determine how long the sprite should move for
float moveDuration = distanceToMove / velocity;
//and finally move the sprite
if(sprite actionForKey:#"moving")
{
[sprite removeActionForKey:#"moving"];
}
SKAction *moveAction = [SKAction moveTo:location duration:moveDuration];
[sprite runAction:moveAction withKey:#"moving"];
}
That will set a velocity for the sprite, determine the length of the travel, and how long it will take to get to the new location.
If you want to involve textures I highly suggest reading the link I provided.
Upon request I would be glad to offer examples using forces to control movement speed as well.
I hope that helps, let me know if there are any problems I wasn't in a position where I could run the code but I am sure that it is fine.
I'm building a game using Sprite Kit that needs quick precise movements following the user's touch. I need to detect if the user has touched on the "Player" in the view, and if they have, when they move, the player sprite needs to move with the touch accordingly.
I have this working now, however, it's not very precise... the more movement input (without lifting your finger), the more offset the sprite gets from the touch location.
Here's the code I'm using right now.
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
if (self.isFingerOnPlayer) {
UITouch* touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self];
CGPoint previousLocation = [touch previousLocationInNode:self];
// Calculate new position for player
int playerX = player.position.x + (touchLocation.x - previousLocation.x);
int playerY = player.position.y + (touchLocation.y - previousLocation.y);
// Limit x and y so that the player will not leave the screen any
playerX = MAX(playerX, player.size.width/2);
playerX = MIN(playerX, self.size.width - player.size.width/2);
playerY = MAX(playerY, (player.size.width/2)-3+inBoundsOffset);
playerY = MIN(playerY, (self.size.height - ((player.size.width/2)-3) - inBoundsOffset));
// Update position of player
player.position = CGPointMake(playerX, playerY);
}
}
-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
UITouch* touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self];
SKPhysicsBody* body = [self.physicsWorld bodyAtPoint:touchLocation];
if (body && [body.node.name isEqualToString: #"player"]) {
NSLog(#"Began touch on player");
self.isFingerOnPlayer = YES;
}
}
-(void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
self.isFingerOnPlayer = NO;
}
It detects the touch location, checks to make sure that you're touching the player sprite, if you are, then when you move, so does the sprite... but it can get off quite quickly if you're slinging your finger around (as playing this game will cause the player to do).
Can anybody suggest a more accurate way of accomplishing this, that will keep the sprite under the user's finger even when moving around a lot without lifting your finger?
You have to keep in mind that -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event ONLY gets called when the moving finger writes (sorry couldn't help the Inspector Clouseau reference).
In effect what happens is that the user can very quickly move his/her finger from one location to the next and as soon the the finger is lifted, your position updates stops.
What I suggest you do is create a CGPoint property and have -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event store the location in the CGPoint property.
Then in your -(void)update:(CFTimeInterval)currentTime you add the code that actually moves the player to the finger coordinates. This should make things a lot smoother.
So I have an SKSpriteNode that I am spawning a bunch of from the top of the screen. The effect I am trying to achieve is that when the user taps one of the spawned nodes, only that node disappears from the view.
How do I achieve this?
Assuming you've sub-classed SKScene then you could write something like this:
-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
for(UITouch *touch in touches) {
CGPoint location = [touch locationInNode:self];
SKNode* node = [self nodeAtPoint:location];
[node removeFromParent];
}
}
Obviously this is incredibly naive, but it should get you started.
touchesBegan is the call-back when a touch is started - it receives a collection of touches.
For each touch, calculate its location within the current scene, find the node at that position, and remove the node from the scene. ARC should look after recycling the memory that node utilised (assuming you have no other pointers to it).
I'm trying to create a program in which when I tap in roughly the same location as where my last touch ended, a circle changes color. I've tried using the previousLocationInView method using logic along the lines of: "if touchesbegan location == previousTouchesLocation, change color to blue." This method didn't work because the touchesBegan and previousTouchLocation coordinates have the same value which always changed the color whenever I tapped the screen regardless of the location. I get the same result if I substitute previousTouchLocation with touchesEnded. Here is the code if anyone thinks that it could help.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch* touch = [touches anyObject];
touchLocation = [touch locationInView:self.view];
lastTouchLocation = [[touches anyObject] previousLocationInView:self.view];
distance_x = touchLocation.x - cvx;
distance_y = cvy - touchLocation.y;
previousDistance_x = lastTouchLocation.x - cvx;
previousDistance_y = cvy - lastTouchLocation.y;
if ((previousDistance_x == distance_x) && (previousDistance_y == distance_y)) {
if (([cv.color isEqual:[UIColor redColor]])) {
[cv setColor:[UIColor blueColor]];
}
else
[cv setColor:[UIColor redColor]];
}
}
-previousLocationInView: gives you the previous location of a touch that's currently moving on the screen. It doesn't give you the location of a different, now ended, touch.
What you're going to have to do is, on the first touch, store the touch's location in a property or ivar. Then, on the second touch, compare its location to the stored location. You'll need to allow for some leeway—fingers are not pixel-accurate in the way mice can be—so a touch that's moved ten or twenty pixels should probably count as a double-tap.
Actually, come to think of it, your best bet might be to use a UITapGestureRecognizer with numberOfTapsRequired set to 2. This will handle all the detection logic for you, and you can combine it with other gesture recognizers to build up more complex behaviors.
I want to detect a touch while one finger is still on the screen means that still touch canceled for that is not called... is it possible because i want to ignore that touch and perform operation on the next finger......
Thanks
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
//those are all touches on this began call
for (UITouch *touch in touches) {
CGPoint location = [touch locationInView: [touch view]];
CGPoint convertedLocation = [[CCDirector sharedDirector] convertToGL:location];
//those are ALL the touches on screen
NSSet *allTouches = [event allTouches];
You can also keep track of touches by reading the hash code of the touch and saving it using int firstTouchHash = [touch hash].
You can check in the TouchesBegan if the touches set and the allTouches set have the same count (in this case we are touching the screen for the first time), in that case we can save the hash int firstTouchHash = [touch hash]
When we touch the screen again, the allTouches contains more elements than touches and we always know wich was the first touch because we have the hash saved.
(without saving the hash, if we touch with 1 finger, then with a second one and then with a third, when the third touch occurs we dont know which of the 2 previous touches is the first, because they both are in the allTouches set (and a set is an unordered collection of elemenents) )
Also make sure multiple touch is enabled on the view, either through the multipleTouchEnabled property or the Multiple Touch checkbox in the storyboard editor.