This is my ccTouchesMoved method.
Whats wrong? I use cocos2d framework.
-(void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
CCNode *sprite = [self getChildByTag:kTagPlayer];
CCNode *sprite2 = [self getChildByTag:kTagEnemy];
CGPoint point;
//Собрать все касания.
NSSet *allTouches = [event allTouches];
for (UITouch *touch in allTouches)
{
point = [touch locationInView:[touch view]];
point = [[CCDirector sharedDirector] convertToGL:point];
if (point.y > 384)
{
if (point.x > 992)
sprite2.position = ccp(992, size.height - 100);
else if (point.x < 32)
sprite2.position = ccp(32, size.height - 100);
else
sprite2.position = ccp(point.x, size.height - 100);
}
else
{
if (point.x > 992)
sprite.position = ccp(992, 100);
else if (point.x < 32)
sprite.position = ccp(32, 100);
else
sprite.position = ccp(point.x, 100);
}
}
}
Have you enabled multiple touches in your glView? By default the glView is instantiated in the app delegate. The code is below.
[glView setMultipleTouchEnabled:YES];
In case you're developing a Retina display App, be aware that all coordinates are in points, not pixels. So even on a Retina display with 960x640 pixels the coordinates in points (your touch location) will be in the range 480x320.
If you want to use pixels, use the "InPixels" version of all coordinates, in this case:
sprite.positionInPixels = ccp(992, 100);
If that's not the problem you should add to your post what the expected outcome is and what happens instead. A little context goes a long way.
What does the debugger say is in allTouches? You could try getting all the touches for the view like this instead:
UITouch* touch = [touches anyObject];
NSSet* allTouches = [touches setByAddingObjectsFromSet:[event touchesForView:[touch view]]];
Related
I seem to be having an issue with calculating the angle between my sprite and a touch point. I'm trying to get my sprite to directly face the direction of the touch point whenever the user touches the screen. Here's my code:
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
CGPoint tapPosition;
for (UITouch *touch in touches){
CGPoint location = [touch locationInView:[touch view]];
tapPosition = [self convertToNodeSpace:[[CCDirector sharedDirector] convertToGL:location]];
}
float angle = CC_RADIANS_TO_DEGREES(ccpAngle(fish.position, tapPosition));
[fish runAction:[CCRotateTo actionWithDuration:0.5 angle:angle]];
}
Any ideas? Thanks
Add this to the end of Nikhil's answer to avoid getting a negative angle when the touch location is to the bottom right of the sprite.
if (calculatedAngle < 0)
{
calculatedAngle+=360;
}
Try this out, first of all you don't need that for loop because you are just going to end up with the last touch location anyway. You may as well use [touches anyObject] as below.
Second, I am not sure what ccpAngle does off the top of my head but when macros like that don't work sometimes its easier to just do the maths yourself.
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint tapPosition;
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:[touch view]];
tapPosition = [self convertToNodeSpace:[[CCDirector sharedDirector] convertToGL:location]];
float dY = fish.position.y - tapPosition.y;
float dX = fish.position.x - tapPosition.x;
float offset = dX<0 ? 90.0f : -90.0f;
float angle = CC_RADIANS_TO_DEGREES(atan2f(dY, dX)) + offset;
[fish runAction:[CCRotateTo actionWithDuration:0.5 angle:angle]];
}
You probably could replace dX and dY with a point from ccpDiff as well but it doesn't really matter. Also depending on where the head of your fish is you may need to adjust the angle offset but I will leave that up to you.
Let me know if this helps.
CCPoint pos1 = [fish position];
CCPoint pos2 = touchlocation;
float theta = atan((pos1.y-pos2.y)/(pos1.x-pos2.x)) * 180 * 7 /22;
float calculatedAngle;
if(pos1.y - pos2.y > 0)
{
if(pos1.x - pos2.x < 0)
{
calculatedAngle = (-90-theta);
}
else if(pos1.x - pos2.x > 0)
{
calculatedAngle = (90-theta);
}
}
else if(pos1.y - pos2.y < 0)
{
if(pos1.x - pos2.x < 0)
{
calculatedAngle = (270-theta);
}
else if(pos1.x - pos2.x > 0)
{
calculatedAngle = (90-theta);
}
}
Use this calculatedAngle in your Run Action.. hope this helps... :)
i want to select my targets using touches rect
am creating my unselected dots by coding like these:-
targets1 = [[NSMutableArray alloc] init];
for(int i=0;i<3;i++)
{
for (int y=0; y<3; y++) {
CCTexture2D *texture =
[[CCTextureCache sharedTextureCache] addImage:#"UnselectedDot.png"];
block = [CCSprite spriteWithTexture:texture rect:CGRectMake(0,0,82,82)];
CGFloat xoffset = ((block.contentSize.width)*10) + (((block.contentSize.height)-175)*y);
block.position = ccp( (i*82)+80,xoffset);
[bg1 addChild:block];
[targets1 addObject:block];
}
}
below is my sample output .
now i need to select all the dots by touches method. i written coding like these:-
- (void)update:(ccTime)dt {
// NSLog(#"%#",targets1);
for (CCSprite *sprite in targets1) {
CGRect dotrect = CGRectMake(sprite.position.x,
sprite.position.y-95,
sprite.contentSize.width,
sprite.contentSize.height);
CGFloat x = location.x;
CGFloat y = location.y;
CGFloat width = (location1.x - location.x);
CGFloat height = -(location1.y - location.y);
CGRect touchrect = CGRectMake (x, y, width,height);
NSLog(#"dotrect = %f,%f,%f,%f",dotrect.origin.x,dotrect.origin.y,dotrect.size.width,dotrect.size.height );
NSLog(#"touch rect = %f,%f,%f,%f,%f,%f",touchrect.origin.x,touchrect.origin.y,touchrect.size.width,touchrect.size.height,location1.x,location1.y);
if( CGRectContainsRect(dotrect, touchrect))
{ //collision detection
NSLog(#"am touched dot ");
}
}
}
- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
location = [touch locationInView:[touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
NSLog(#"am touched began");
return YES;
}
- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event {
location1 = [touch locationInView:[touch view]];
location1 = [[CCDirector sharedDirector] convertToGL:location1];
location1 = [self convertToNodeSpace:location1];
}
as per above coding my concept is :- using touches began and touches ended am making rectangle here.. inside these touchrect my unselected dot rect came means collsison detected.. then i can do my stuffs there. but its not colliding all.
am not getting were am making mistake.
Edit :1
now i got why coillision not working... actually insidemy touches rect having multiple rect.. so only ... here, am using rectcontainsrect.. tahts the problem.. any other method to rect having several rect for colllsion detection..
Try using:
CGPoint location=[touch locationInView:[touch view]];
location = [self convertTouchToNodeSpace:touch];
CGRectContainsPoint([dot boundingBox], location);
inside the CCTouch.. methods (as you wish depending on what you want to do).
I know this question has been asked several times, trust me I have searched. I have found one answer to rotating a sprite with touch, but there has to be a simpler way.
All I need is for my sprite to rotate with my touch. Max rotation 0 Minimum rotation 0.
I know that I'll need a few checks.
int maxRot = 0;
int minRot = 0;
if (arrowRotation > maxRot)
{
//do or don't do something
} else if (arrowRotation < minRot)
{
//do or don't do something
}
Can someone lead me in the right direction to rotating a sprite with touch, with a minimun and maximum rotation?
Here is the code that I think is to complicated or can be accomplished in a simpler way.
-(void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
//acquire the previous touch location
CGPoint firstLocation = [touch previousLocationInView:[touch view]];
CGPoint location = [touch locationInView:[touch view]];
//preform all the same basic rig on both the current touch and previous touch
CGPoint touchingPoint = [[CCDirector sharedDirector] convertToGL:location];
CGPoint firstTouchingPoint = [[CCDirector sharedDirector] convertToGL:firstLocation];
CGPoint firstVector = ccpSub(firstTouchingPoint, _arrow.position);
CGFloat firstRotateAngle = -ccpToAngle(firstVector);
CGFloat previousTouch = CC_RADIANS_TO_DEGREES(firstRotateAngle);
CGPoint vector = ccpSub(touchingPoint, _arrow.position);
CGFloat rotateAngle = -ccpToAngle(vector);
CGFloat currentTouch = CC_RADIANS_TO_DEGREES(rotateAngle);
//keep adding the difference of the two angles to the dial rotation
arrowRotation += currentTouch - previousTouch;
}
Thanks in advance!
I dont think you can simplify the rotation into anything simpler. I honestly didnt get how you want to both the minimum and the maximum rotations to be zero. They cant be same value. If you want to limit the rotation to a maximum and minimum add the following to the end of your ccTouchesMoved: method:
if (arrowRotation >= maxRot) {
arrowRotation = maxRot;
}
else if (arrowRotation <= minRot) {
arrowRotation = minRot;
}
use KTOneFingerRotationGestureRecognizer...
KTOneFingerRotationGestureRecognizer *rotation;
rotation = [[KTOneFingerRotationGestureRecognizer alloc] initWithTarget:self action:#selector(rotating:)];
[[self Wheel] addGestureRecognizer:rotation];
[rotation release];
Method
- (void)rotating:(KTOneFingerRotationGestureRecognizer *)recognizer {
view = [recognizer view];
if(isRotating == FALSE) {
[view setTransform:CGAffineTransformRotate([view transform], [recognizer rotation])];
}
}
In touchesBegan:
CGPoint touch_point = [[touches anyObject] locationInView:self.view];
There are tens of UIImageView around, stored in a NSMutableArray images. I'd like to know is there a built-in function to check if a CGPoint (touch_point) is inside one of the images, e.g.:
for (UIImageView *image in images) {
// how to test if touch_point is tapped on a image?
}
Thanks
Follow up:
For unknown reason, pointInside never returns true. Here is the full code.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
touch_point = [touch locationInView:self.view];
for (UIImageView *image in piece_images) {
if ([image pointInside:touch_point withEvent:event]) {
image.hidden = YES;
} else {
image.hidden = NO;
}
NSLog(#"image %.0f %.0f touch %.0f %.0f", image.center.x, image.center.y, touch_point.x, touch_point.y);
}
}
although I can see the two points are sometimes identical in the NSLog output.
I also tried:
if ([image pointInside:touch_point withEvent:nil])
the result is the same. never returns a true.
To eliminate the chance of anything goes with with the images. I tried the following:
if (YES or [image pointInside:touch_point withEvent:event])
all images are hidden after the first click on screen.
EDIT 2:
Really weird. Even I hard coded this:
point.x = image.center.x;
point.y = image.center.y;
the code becomes:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point; // = [touch locationInView:self.view];
for (UIImageView *image in piece_images) {
point.x = image.center.x;
point.y = image.center.y;
if ([image pointInside:point withEvent:event]) {
image.hidden = YES;
NSLog(#"YES");
} else {
image.hidden = NO;
NSLog(#"NO");
}
NSLog(#"image %.0f %.0f touch %.0f %.0f", image.center.x, image.center.y, point.x, point.y);
}
}
pointInside always returns false ...
Sounds to me like the problem is you need to convert coordinates from your view's coordinates to the UIImageView's coordinates. You can use UIView's convertPoint method.
Try replacing
if ([image pointInside:touch_point withEvent:event]) {
with
if ([image pointInside: [self.view convertPoint:touch_point toView: image] withEvent:event]) {
(Note that you are allowed to pass nil instead of event.)
I guess this is a bit late for the questioner, but I hope it is of use to someone.
if ([image pointInside:touch_point withEvent:event]) {
// Point inside
}else {
// Point isn't inside
}
In this case event is taken from :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view];
for (UIImageView *piece in piece_images) {
CGFloat x_min = piece.center.x - (piece.bounds.size.width / 2);
CGFloat x_max = x_min + piece.bounds.size.width;
CGFloat y_min = piece.center.y - (piece.bounds.size.height / 2);
CGFloat y_max = y_min + piece.bounds.size.height;
if (point.x > x_min && point.x < x_max && point.y > y_min && point.y < y_max ) {
piece.hidden = YES;
} else {
piece.hidden = NO;
}
}
}
too bad, I have do it myself...
it's OS 3.2, XCode 3.2.2, tried both on simulator and iPad
I am wondering what is the best way to implement rotation-based dragging movements in my iPhone application.
I have a UIView that I wish to rotate around its centre, when the users finger is touch the view and they move it. Think of it like a dial that needs to be adjusted with the finger.
The basic question comes down to:
1) Should I remember the initial angle and transform when touchesBegan is called, and then every time touchesMoved is called apply a new transform to the view based on the current position of the finger, e.g., something like:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self]; //current position of touch
if (([touch view] == self)
&& [Utility getDistance:currentPoint toPoint:self.middle] <= ROTATE_RADIUS //middle is centre of view
&& [Utility getDistance:currentPoint toPoint:self.middle] >= MOVE_RADIUS) { //will be rotation gesture
//remember state of view at beginning of touch
CGPoint top = CGPointMake(self.middle.x, 0);
self.initialTouch = currentPoint;
self.initialAngle = angleBetweenLines(self.middle, top, self.middle, currentPoint);
self.initialTransform = self.transform;
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self]; //current position of touch
if (([touch view] == self)
&& [Utility getDistance:currentPoint toPoint:self.middle] <= ROTATE_RADIUS
&& [Utility getDistance:currentPoint toPoint:self.middle] >= MOVE_RADIUS) { //a rotation gesture
//rotate tile
float newAngle = angleBetweenLines(self.middle, CGPointMake(self.middle.x, 0), self.middle, currentPoint); //touch angle
float angleDif = newAngle - self.initialAngle; //work out dif between angle at beginning of touch and now.
CGAffineTransform newTransform = CGAffineTransformRotate(self.initialTransform, angleDif); //create new transform
self.transform = newTransform; //apply transform.
}
OR
2) Should I simply remember the last known position/angle, and rotate the view based on the difference in angle between that and now, e.g.,:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self]; //current position of touch
if (([touch view] == self)
&& [Utility getDistance:currentPoint toPoint:self.middle] <= ROTATE_RADIUS
&& [Utility getDistance:currentPoint toPoint:self.middle] >= MOVE_RADIUS) { //will be rotation gesture
//remember state of view at beginning of touch
CGPoint top = CGPointMake(self.middle.x, 0);
self.lastTouch = currentPoint;
self.lastAngle = angleBetweenLines(self.middle, top, self.middle, currentPoint);
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self]; //current position of touch
if (([touch view] == self)
&& [Utility getDistance:currentPoint toPoint:middle] <= ROTATE_RADIUS
&& [Utility getDistance:currentPoint toPoint:middle] >= MOVE_RADIUS) { //a rotation gesture
//rotate tile
float newAngle = angleBetweenLines(self.middle, CGPointMake(self.middle.x, 0), self.middle, currentPoint); //touch angle
float angleDif = newAngle - self.lastAngle; //work out dif between angle at beginning of touch and now.
CGAffineTransform newTransform = CGAffineTransformRotate(self.transform, angleDif); //create new transform
self.transform = newTransform; //apply transform.
self.lastTouch = currentPoint;
self.lastAngle = newAngle;
}
The second option makes more sense to me, but it is not giving very pleasing results (jaggy updates and non-smooth rotations). Which way is best (if any), in terms of performance?
Cheers!
It is actually much simpler than what you have tried.
You need three data points:
The origin of your view.
The location of the current touch
The location of the previous touch
The Touch object passed to you actually contains the last touch location. So you don't need to keep track of it.
All you have to do is calculate the angle between two lines:
Origin to Current Touch
Origin to Previous Touch
Then convert that to radians and use that in your CGAffineTransformRotate(). Do that all in your touchesMoved handler.
Here is a function to calculate what you need just that:
static inline CGFloat angleBetweenLinesInRadians(CGPoint line1Start, CGPoint line1End, CGPoint line2Start, CGPoint line2End) {
CGFloat a = line1End.x - line1Start.x;
CGFloat b = line1End.y - line1Start.y;
CGFloat c = line2End.x - line2Start.x;
CGFloat d = line2End.y - line2Start.y;
CGFloat line1Slope = (line1End.y - line1Start.y) / (line1End.x - line1Start.x);
CGFloat line2Slope = (line2End.y - line2Start.y) / (line2End.x - line2Start.x);
CGFloat degs = acosf(((a*c) + (b*d)) / ((sqrt(a*a + b*b)) * (sqrt(c*c + d*d))));
return (line2Slope > line1Slope) ? degs : -degs;
}
Courtesy of Jeff LaMarche at:
http://iphonedevelopment.blogspot.com/2009/12/better-two-finger-rotate-gesture.html
Example:
UITouch *touch = [touches anyObject];
CGPoint origin = [view center];
CGFloat angle = angleBetweenLinesInRadians(origin, [touch previousLocationInView:self.superview.superview], origin, [touch locationInView:self.superview.superview]);
Have you considered using UIRotationGestureRecognizer? Seems like that has the logic already baked in, and might make things simpler.