My Problem is i want to draw a line which is exactly half of the touch location
i.e, i am drawing a line on cctouchesmoved and it is drawing a line from first location to my touch location but my problem is i need to display the line only till half of the touch location
here is my code
-(void)draw{
glEnable(GL_LINE_SMOOTH);
glLineWidth(3.0f); // set line width
glColor4f(0.8, 1.0, 0.76, 1.0); // set line color.
ccDrawLine(point1,Point2);
}
-(void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch* touch = [touches anyObject];
CGPoint location = [touch locationInView: [touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
point1 = location;
Point2=CGPointMake(size.width/2, size.height/2);
}
any help will be greatly appreciated.
give two points, a and b, where a is the 'origin' :
ccpMidPoint(a,b);
or, more generally, you could get an arbitrary distance along the line by subtracting a from b, multiplying by the desired factor, then re-adding a:
float percentageOfDistanceAlongLine = 0.5f;
CGPoint pointAlongLine = ccpMult( ccpSub(b, a), percentageOfDistanceAlongLine);
pointAlongLine = ccpAdd(a, pointAlongLine);
so, in your case, point2 = a, point1 = b
Related
This is my first post so go easy haha.
I'm new to 'iOS' 'coding', 'Xcode' and 'spritekit'. I'm looking to make an image node "jump" a distance on the positive y-axis if I touch anywhere on the screen, although if I touch somewhere to the left or right if the image and hold for a certain time, it moves in the respective left or right direction, a distance respective to the length of the touch.
Not sure if that's very clear, but any help would be appreciated! Thanks!
You could move a node like this
In touchesEnded: or touchesBegan: method:
{
node.position.y += 50;
}
In order for sprite to move somewhere you could also use actions, there is a family of actions like moveTo action.
I would suggest picking upa tutorial or a book about sprite kit. Good site with free tutorials is raywenderlich.com
Please Try this code :
a sprite move : left/right according to your touch direction anywhere on screen
// CGPoint initialPos; // in .h file
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchPt = [touch locationInView:touch.view];
initialPos = [[CCDirector sharedDirector] convertToGL:touchPt];
}
-(void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *myTouch=[touches anyObject];
CGPoint currentPos=[myTouch locationInView:[myTouch view]];
currentPos=[[CCDirector sharedDirector] convertToGL:currentPos];
float diffX = currentPos.x - initialPos.x;
float diffY = currentPos.y - initialPos.y;
CGPoint velocity = ccp(diffX, diffY);
initialPos = currentPos;
[Sprite setPosition:ccpAdd([SmileBall position], velocity)];
}
- (void) ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *myTouch=[touches anyObject];
CGPoint currentPos=[myTouch locationInView:[myTouch view]];
currentPos=[[CCDirector sharedDirector] convertToGL:currentPos];
float diffX = currentPos.x - initialPos.x;
float diffY = currentPos.y - initialPos.y;
CGPoint velocity = ccp(diffX, diffY);
initialPos = currentPos;
[Sprite setPosition:ccpAdd([SmileBall position], velocity)];
}
a sprite jump up: according to your touch on screen
-(void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
CCSprite *RunningChar;
RunningChar=(CCSprite *)[self getChildByTag:10];
UITouch *touch = [touches anyObject];
CGPoint touchPt = [touch locationInView:touch.view];
touchPt = [[CCDirector sharedDirector] convertToGL:touchPt];
float radian = ccpToAngle(ccpSub(touchPt, prevPoint));
float degrees = CC_RADIANS_TO_DEGREES(radian);
if (degrees >= 22.5 && degrees <= 112.5) // for upward direction :). otherwise you can write only code without ant condition
{
CCJumpTo *jump=[CCJumpTo actionWithDuration:0.7 position:CGPointMake(RunningChar.position.x, 87) height:110 jumps:1];
[RunningChar runAction:seq];
}
else
{
}
}
Try this :)
I have written some code that restricts the movement of a box (UIView) to a grid.
When moving the box, the movement is locked to the grid and the box starts getting behind your finger if you drag diagonally or really fast.
So what is the best way to write a method that makes the box catch up and get back under the finger - it must move on the same path as your finger - and it must also not move through other boxes, so it needs collision detection - so I just can't do an Animate to new center point.
Any suggestions?
This is current code in use:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:self.superview];
lastLocation = location;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:self.superview];
CGPoint offset = CGPointMake(self.center.x + location.x - lastLocation.x, self.center.y + location.y - lastLocation.y);
CGPoint closestCenter = [self closestCenter:offset];
CGRect rect = CGRectMake(offset.x - (self.size.width / 2), offset.y - (self.size.height / 2), self.size.width, self.size.height);
if (fabsf(closestCenter.x - offset.x) < fabsf(closestCenter.y - offset.y)) {
offset.x = closestCenter.x;
}
else {
offset.y = closestCenter.y;
}
// Do collision detection - removed for clarity
lastLocation = location;
self.center = offset;
}
Don't use a relative offset movement. Instead, use the actual touch location as the desired position and then bound (modify) it based on the grid restrictions. In this way you won't get any lag behind the touch.
From your collision detection I guess there is a path that must be followed and a naive implementation will 'jump' the view to the touch across boundaries. A simple solution to this is to limit jumping to a maximum of half a grid square (so the user must bring the touch back to the view if they drop it).
I am developing an app, Which has feature that dragging and rotating the image view.
I have implemented to drag and rotate successfully by using below code
In touchesBegan Method
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
touchStart = [[touches anyObject] locationInView:imageView];
isResizingLR = (containerVw.bounds.size.width - touchStart.x < kResizeThumbSize && containerVw.bounds.size.height - touchStart.y < kResizeThumbSize);
}
In touchesMoved Method
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
CGPoint touchPoint = [[touches anyObject] locationInView:containerVw];
CGPoint previous=[[touches anyObject]previousLocationInView:containerVw];
UITouch *touch = [[event allTouches] anyObject];
if (isResizingLR) {
CGFloat currA = [self pointToAngleFromCenter:[touch locationInView:containerVw.superview]] ;
CGFloat prevA = [self pointToAngleFromCenter:[touch previousLocationInView:containerVw.superview]] ;
// the current value of the rotation angle
CGFloat tranA = atan2(containerVw.transform.b, containerVw.transform.a) ;
// the angle difference between last touch and the current touch
CGFloat diffA = currA - prevA ;
// the new angle resulting from applying the difference
CGFloat angle1 = tranA - diffA ;
CGAffineTransform t = CGAffineTransformMakeRotation(angle1) ;
containerVw.transform =t;
}
if (!isResizingLR) {
containerVw.center = CGPointMake(containerVw.center.x + touchPoint.x - touchStart.x, containerVw.center.y + touchPoint.y - touchStart.y);
}
}
My Problem
Above code is working fine until rotating the image view after dragging. In case if i drag the image view after rotating it. image view has gone away from screen.
In touchesEnd method i tried to print the image view frame. for example my image view frame at the beginning is (100,100,150,149) after rotating it the image view 160º frame has changed to (103,31,182,183) up to now its working fine.
After rotating it if try to move an image view, the image view has gone away from screen now the frame has changed to (615,-212,182,183)
Please guide me how do i resolve it.
Have a look at this project. This may help you. But here, the movement is handled by gestures and not by touch. It may solve your problem.
Is there any way to rotate a CCSprite to behave like a car Steering?If i release my touch with the CCSprite,it should automatically return to its original position in a smooth way exactly like a steering!Im using the below code,
-(void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch=[touches anyObject];
//acquire the previous touch location
CGPoint firstLocation = [touch previousLocationInView:[touch view]];
location = [touch locationInView:[touch view]];
CGPoint touchingPoint = [[CCDirector sharedDirector] convertToGL:location];
CGPoint firstTouchingPoint = [[CCDirector sharedDirector] convertToGL:firstLocation];
CGPoint firstVector = ccpSub(firstTouchingPoint, Steering.position);
CGFloat firstRotateAngle = -ccpToAngle(firstVector);
CGFloat previousTouch = CC_RADIANS_TO_DEGREES(firstRotateAngle);
CGPoint vector = ccpSub(touchingPoint, Steering.position);
CGFloat rotateAngle = -ccpToAngle(vector);
CGFloat currentTouch = CC_RADIANS_TO_DEGREES(rotateAngle);
dialrotation+=currentTouch-PreviousTouch;
sprite.rotation=dialrotation;
}
This rotates my CCSprite Smoothly,but i don't know how to return back to its original position like Car Steering.Is there any way to do so in Cocos2D?
In ccTouchesBegan method store the value of sprite.rotation somewhere, in ccTouchesEnded run CCRotateTo action on your sprite using this stored value.
I have a large image (1024, 1496) as a background image of my layer.So I started to show the button of the image.
In the time of application I show the top of the image, and some CCSprites.
id move = [CCMoveBy actionWithDuration:2 position:ccp(0,-746)];
[layer runAction:move];
My problem is that I can't detect touch on the CCSrites because their position stay the same ex. (20, 1200), and the UITouch between the (1024,746).
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
for(UITouch * touch in [event allTouches]){
for (CCSprite *book in books) {
CGPoint location = [touch locationInView:touch.view];
location = [[CCDirector sharedDirector] convertToGL:location];
if (CGRectContainsPoint([book boundingBox], location))
NSLog(#"Touch");
else{
NSLog(#"NO Touch"); }
}
}
}
Any idea how to solve this problem??
Just convert the sprite touch to world coordinates. You can do this with your own method by calculating the screen position based on zooming and sprite size, or use methods within Cocos to convert to world coordinates. I tend to do the former.