move Sprite with touches moved - ios

i am moving a sprite using the touches moved method. currently the sprite jumps to the point on which the screen is touched but I want the sprite only to move when it is touched directly.
my code:
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
for (UITouch *touch in touches) {
CGPoint location = [touch locationInNode:self];
CGPoint newPosition = CGPointMake(location.x, self.size.height/2);
self.sprite.position = newPosition;
}
}

check if the touch location is inside the sprite, like this:
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint positionInScene = [touch locationInNode:self];
if(CGRectContainsPoint(self.sprite.boundingBox,positionInScene)) {
CGPoint newPosition = CGPointMake(positionInScene.x, self.size.height/2);
self.sprite.position = newPosition;
}
}

Related

How can I make UITouches offset?

In the image below, I draw and the result is at point A, right where my finger touches.
How can I make the image appear about 40pt above my actual touch. (B)
I'm using the classic coreGraphic UITouch code, like so:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// add the first touch
UITouch *touch = [touches anyObject];
previousPoint1 = [touch previousLocationInView:self];
currentPoint = [touch locationInView:self];
//transform = CGAffineTransformTranslate(self.transform, 5.0, 10.0)
// init the bezier path
self.currentTool = [self toolWithCurrentSettings];
self.currentTool.lineWidth = self.lineWidth;
self.currentTool.lineColor = self.lineColor;
self.currentTool.lineAlpha = self.lineAlpha;
[self.pathArray addObject:self.currentTool];
[self.undoStates addObject:[self.currentTool captureToolState]];
[self.currentTool setInitialPoint:currentPoint];
}
// call the delegate
if ([self.delegate respondsToSelector:#selector(drawingView:willBeginDrawUsingTool:)]) {
[self.delegate drawingView:self willBeginDrawUsingTool:self.currentTool];
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
// save all the touches in the path
UITouch *touch = [touches anyObject];
previousPoint2 = previousPoint1;
previousPoint1 = [touch previousLocationInView:self];
currentPoint = [touch locationInView:self];
[self.currentTool moveFromPoint:previousPoint1 toPoint:currentPoint];
[self setNeedsDisplay];
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
// make sure a point is recorded
[self touchesMoved:touches withEvent:event];
CGPoint point = [[touches anyObject] locationInView:self];
[self.currentTool setInitialPoint:point];
self.draggableTextView = ((ACEDrawingDraggableTextTool *)self.currentTool).labelView;
[self.pathArray addObject:self.currentTool];
[self finishDrawing];
[self finishDrawing];
}
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
// make sure a point is recorded
[self touchesEnded:touches withEvent:event];
}
previousPoint1 = [touch previousLocationInView:self];
currentPoint = [touch locationInView:self];
// add these 2 lines below:
previousPoint1 = CGPointMake(previousPoint1.x, previousPoint1.y+40);
currentPoint = CGPointMake(currentPoint.x, currentPoint.y+40);

Sprite Kit physics causes too much shaking

In my app, once the gamepieces are stacked to a certain height, the screen starts to move down to allow more room for building. The problem is that everytime the screen moves down, the gamepieces shake so much that they topple over.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
for (UITouch *touch in touches) {
CGPoint location = [touch locationInNode:self];
SKSpriteNode *gamePiece = [self pickObject];
gamePiece.position = location;
gamePiece.physicsBody.dynamic = NO;
[self addChild:gamePiece];
_currentTouch = touch;
currentGamePiece = gamePiece;
CGPoint touchLocation = [touch locationInNode:self.scene];
if(touchLocation.y > 350)
{
_bg.position = CGPointMake(_bg.position.x, _bg.position.y-2);
}
}
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
/* Called when a touch begins */
for (UITouch *touch in touches) {
CGPoint location = [touch locationInNode:self];
if ([touch isEqual:_currentTouch])
{
currentGamePiece.position = location;
}
CGPoint touchLocation = [touch locationInNode:self.scene];
if(touchLocation.y > 350)
{
_bg.position = CGPointMake(_bg.position.x, _bg.position.y-2);
}
}
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
/* Called when a touch begins */
for (UITouch *touch in touches)
{
CGPoint location = [touch locationInNode:self];
if ([touch isEqual:_currentTouch])
{
currentGamePiece.position = location;
currentGamePiece.physicsBody.dynamic = YES;
}
}
}

How to detect touches in physicsBody area?

I did create SKSpriteNode using this code and physicsBody is circle. How I could check that user did touch eare in the physicsBody?
self = [super initWithColor:[SKColor clearColor] size:CGSizeMake(200, 200)];
//...
self.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:self.size.width/2.0f];
self.userInteractionEnabled = YES;
I did found solution for my problem using this code:
CGMutablePathRef pathRef;
// Fill pathRef with points and create phisycs body using pathRef.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self.scene];
if (CGPathContainsPoint(pathRef, nil, touchLocation, NO)) {
// If we are here it means user did touche physic body.
}
}
The easiest solution would be to create a second invisible sprite, with the size you need, and place it directly over the area you want to record touches on.
The other option is to store ALL the coordinates which trigger a valid touch and compare them against the actual touch coordinate in your touch method, like this:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self.scene];
NSLog(#"%#", NSStringFromCGPoint(touchLocation));
// Compare the touchLocation coordinate against your list of acceptable coordinates...
}

how to make an object draggable?

hey guys i was wondering if there was away to make an object like a UIImageView draggable. I am aware of the UITouch and touches i.e.
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *drag=[[event allTouches] anyObject];
player.center=[drag locationInView:self.view];
}
but in this way it is possible for the user to make the object jump across the screen to where he or she touches the screen but i want the user to have to manually drag the object across the screen.
please explain with code and let me know if i have to be more specific or clear...
You can do this:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *aTouch = [touches anyObject];
CGPoint location = [aTouch locationInView:self.view];
if(CGRectContainsPoint(self.playerView.frame,location)) {
[UIView beginAnimations:#"Dragging A DraggableView" context:nil];
self.playerView.center = location;
[UIView commitAnimations];
}
}
This should give you a smooth animation.
if you want your user to drag&drop, first you have to check if the touch is inside the imageview rect frame. To improve the user experience, you can detect the touch offset from the imageview center; a good place to do this is inside the touchesBegan:withEvent:. After that, you have to change the position of the imageview, like this:
CGPoint touchOffset; //insert this inside your interface private iVars
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *drag=[[event allTouches] anyObject];
CGPoint touchLocation = [drag locationInView:self.view];
touchOffset = CGPointMake(player.center.x-touchLocation.x,player.center.y-touchLocation.y)
if(CGRectContainsPoint(player.frame,touchLocation)
player.center = CGPointMake(touchLocation.x+touchOffset.x,touchLocation.y+touchOffset.y);
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *drag=[[event allTouches] anyObject];
CGPoint touchLocation = [drag locationInView:self.view];
if(CGRectContainsPoint(player.frame,touchLocation)
player.center = CGPointMake(touchLocation.x+touchOffset.x,touchLocation.y+touchOffset.y);
}
P.S. - Next time try to search similar questions...
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch* aTouch = [touches anyObject];
UIView* aView = [aTouch view];
if (aView != self.view) {
[self.view bringSubviewToFront:aView];
}
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch* aTouch = [touches anyObject];
UIView* aView = [aTouch view];
if (aView != self.view) {
aView.center = [aTouch locationInView:self.view];
}
}

Moving a sprite by touching anywhere on the screen

In my game only one sprite responds to touches. How can I make a mousejoint move this sprite/body regardless of where I touch on the screen?
- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView: [touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
mySprite.position = location;
}
Make sure in your initmethod that self.isTouchEnabled = YES;

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