i want to rotate the needle of meter used in my game around its axis how it is possible?
needleSprite.setRotationCenter(this.getRotationCenterX(),
this.getRotationCenterY()); needleSprite.registerEntityModifier(new
RotationModifier(6f, 0, 270));
needleSpirte.setRotation(float);
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I'm trying to build a game about billiards. The screen is like a table, the default direction of the gravity system is downward, that is, the Y axis. And I want to change this direction to Z axis, so the ball has both gravity effect and will not fall down. Does anyone know how to do this? Thanks.
physicsWorld.gravity in SpriteKit is a 2D vector (dx,dy) and thus has no concept of the z axis.
for a top-down billiard game you might try turning gravity off self.physicsWorld.gravity = .zero and then use velocity and linearDamping on your billiard ball nodes to simulate realistic rolling.
I am using Sprite Kit in Xcode and I was wondering how to change gravity direction.As default gravity direction to "X" you can imagine on below axes graphic.What about if I would like to change to "Y".
My goal is giving to object the falling effect.Its like falling from hight point and touching the ground than getting respond with physics!
(Could be dices on board game)
//Default gravity direction is X
SKSpriteNode *myNode =[SKSpriteNode spriteNodeWithImageNamed:#"ball"];
myNode.physicsBody=[SKPhysicsBody bodyWithCircleOfRadius:self.frame.size.width/2];
[self addChild: myNode];
Thanks in advance!
You can apply a vector to the Physics World of your scene using this code
self.physicsWorld.gravity=CGVectorMake(0,-10);
In SpriteKit, X and Y are the default coordinates that you see on the screen, and the Z coordinate is the order in which the objects are positioned (the zPosition). Since SpriteKit uses a 2D game engine, you do not have a third dimension, Z, to utilize. You can change the gravity between Y and X (Top/Bottom and Left/Right of screen respectively), but not between the Z coordinate. If you want to recreate a "dice falling" effect, I would recommend you create a Sprite called Dice scaled to a large amount, and once you add it to the scene you scale it down in x amounts of seconds.
[self runAction:[SKAction scaleBy:negativeFloatHere duration:3]];
This will make the dice appear to be falling, and you might want to add some spinning animations for it if you with. If you want to use the 3D engine, go try out Metal or SceneKit
so I have a sprite that is created every second and that is moving at a random position (sprite1) and another sprite that has a fixed position (sprite2). I would like that when sprite1 collide with sprite2, sprite1 is like sticked to it (it stops moving and is sticked to it) . How can I do this please ? sorry for my english I'm french :/
p.s : sprite2 is rotating with accelerometer, so if sprite1 collide with it I would like that it rotate too :)
I think, you can try to use box2d to do this. It will help to detect collisions and to manage rotations, movement, etc.
I think, you can do it simply in Cocos2d.
1) First set the rect for sprite1 and sprite2 using CGRectMake(x,y,width,height)
2) As you told sprite1 is moving at random position and sprite2 is fixed to particular position, you can check them collide by using CGRectIntersectsRect([sprite1 bounds],[sprite2 bounds]).
3) if it intersects, set sprite1.position = sprite2.position
Note: you said sprite1 is rotating, rect can be fit only to the regular bodies. if you want exact collision or physical properties for sprite better you can go for box2d.
If you don't want to use Box2d (which can handle circle collisions), you can try something like this:
1.) Detect collision, is the distance between the two circles center point (x,y), less than the sum of the two circles radius.
2.) Make the Sprite1 stick to Sprite2, Stop the movement of Sprite1, and save the relative delta (x,y) to Sprite2, then whenever Sprite2 moves or rotates apply the same delta movement and rotation to Sprite1.
I'm scaling my sprite in cocos2d. While using the method CCScaleBy, it's scaling the sprite but I can not get the position at which it's scaling. If i use CCMoveBy I can get the position.
Can anyone help me with it??
Thank you,
Anks
CCMoveBy alters the position of the sprite. CCScaleBy alters the scale property but not the position.
The translation (position) and scale transformation is done around the anchorPoint.
You could calculate the resulting coordinates of the sprite using the position, scale, rotation and anchorPoint.
I have subclassed UIImageView to create a soccer ball.
The ball bounces and moves along an x & y axis, and depending on where you touch the ball, the ball will move as you'd expect a soccer ball would.
My problem is that I would like to rotate the Ball(UIImageView), but still know the x & y positions from it's original position.
I am rotating it with the following code:
ball.superview.transform = CGAffineTransformMakeRotation(M_PI+(ball.center.x*.015));
ball.transform= CGAffineTransformMakeRotation(M_PI+(ball.center.x*.015));
When I rotate it, the x & y position also rotate. Can I somehow get the x/y distance from the centre of the UIImageView? Any other ideas?
Thanks,
James.
I think if you set the anchor of your CALayer of the UIIMageView to be the center of the UIImageView youll be ok, right now its set to the upper left corner and so are expiriencing the x and y moving.
Why are you rotating the superview also? If you don't do that the center x,y will not be affected.
Why not just use ball.center as the position. This way, rotations will have no effect on the position (assuming your image is correctly centered).