I'm using cocos2d for iOS. Not sure if I'm doing something wrong here or if CCParallaxNode does something strange that I just don't understand.
I'm trying to create a few layers of parallax scrolling in the background of my game, at the moment I just have one layer added to the parallax node till I can figure out what's going wrong. When the game loads the layer it's always offset down and left by about 30% of the image size. I've uploaded an image demonstrating the difference in position here http://oi42.tinypic.com/29dz1av.jpg.
Here is my code:
background = [CCParallaxNode node];
background.anchorPoint = ccp(0,0);
background.position = ccp(0,0);
[self addChild: background];
background_image = [CCSprite spriteWithFile: #"layer01.png"
rect: CGRectMake(0, 0, 100, 100)];
background_image.anchorPoint = ccp(0,0);
background_image.position = ccp(0,0);
[background addChild: background_image z:0 parallaxRatio: ccp(0,0) positionOffset:ccp(0,0)];
The cocos2d icon is attached to the same layer as the parallax node and it's position and anchor point are set to 0,0 so the bottom left of the icon should be in the same location as the bottom left of the blue background image.
I have tested this using a basic sprite in place of the parallax node and everything lines up as it should so it's not the image itself.
Any help with this would be appreciated.
First, I don't suggest you to set parallax node & its children's anchor point & position directly because it will cause some unexpected results. You should add the parallax node to a layer as its child, and set the layer's anchor point & position to place your parallax.
Second, CCParallaxNode also provides a positionOffset that you can place your picture in parallax at first. This can help if you want to align several layers of pictures' view center.
So I think you should do something like this(Since I'm using cocos2d-x, I'm not sure its right with obj-C):
layer = [[CCLayer alloc]init];
background = [CCParallaxNode node];
[layer addChild: background];
[self addChild: layer];
Then you just have to add the picture sprite in background, and set layer's position & anchor point.
Hope it can help.
Make sure the background image size is 480x320.
Why did you write CGRectMake(0, 0, 100, 100) ? Why 100 and 100 ? You're limiting your 'CGRect', that's probably wrong..
Related
I have the following sprite that falls to the bottom of the screen:
// The View
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
self.physicsWorld.contactDelegate = self;
// The Sprite
SKSpriteNode *cube = [[SKSpriteNode alloc] initWithImageNamed:#"cube"];
[cube setPosition:CGPointMake(160,250);
[self addChild:cube];
// The Physics
cube.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:cube.frame.size];
cube.physicsBody.dynamic = YES;
cube.physicsBody.affectedByGravity = YES;
cube.physicsBody.mass = 0.02;
Is there a way to make it so its sides are bulging when it hits the bottom border of the screen? Something that would be Jelly like or a soft body that still maintains its shape to some extent but bulges out under its own weight? I hope this makes sense....
Visit the site https://gist.github.com/kazukitanaka0611/4b9d4ac9dff0cd317b6c it have explanation and source code for soft bodies (jelly) in sprite kit
quick and easy way without math:
1 use flash to tween your box warping.
2 export the tweened frames as a sprite sheet (texture atlas)
3 animate the texture atlas on contact with an edge physics body in your scene.
your box will fall and on contact animate the separate images to give the impression its warping/bulging sides.
i used this method and it works - in other words it gives the desired effect, which in my view is what is important - your gamers don't care how you did it, as long as it looks great.
I have a SKShapeNode, and a label under one generic SKNode. If I try to scale that node, its position changes for no reason!. If I try to scale only the nodes it contains under it, it scales properly but not from the center, so it grows out to the up and right.
What am I doing wrong?
First before scale
After scale
Notice its position moves up. Can't figure out why, does it even if I do it as an action or not. Also, the position is not changing based on log, but it appears the frame got bigger (though that is expected)
Steps to recreate issue:
set height and width
#h = 50
#w = 256
create rect with height and width
CGRectMake(0, 0, #w, #h)
get path for rect
UIBezierPath.bezierPathWithRect(rect).CGPath
create skshape node with path, set position
antialiased: false,
lineWidth: 1.0,
strokeColor: SKColor.blackColor,
fillColor: SKColor.whiteColor
Create sklabel, vertical center alignment, set position
create generic SKNode, no properties, add skshapenode and sklabel to it as children
Scale the generic SKNode.
I had a similar problem: I created an SKShapeNode.ellipseInRect which look perfectly fine when I didn't need to scale it. Yet as soon as I tried to scale it down to fit the text it was behind, it would randomly shrink towards the bottom left of the screen!
I did a little debugging, and the number that surprised me was that the position was set to (0, 0) even though the ellipse was in the top left corner of the screen! I then realized that by initializing with a rect the "anchor point" (even though SKShapeNodes don't technically have them) was at (0, 0) too. This behavior would explain my shrinking towards that point and your growing away from that point.
What solved this problem for me was instead of putting my position in the rect, set the position afterwards. Then it scaled around my node's center-point and not the screen origin. Hope that helps!
Try this
SKLabelNode *labNode = [SKLabelNode labelNodeWithFontNamed:#"Arial"];
labNode.fontSize = 12.0f;
labNode.fontColor = [SKColor blackColor];
labNode.text = #"SMASH";
SKSpriteNode *topWithText = [SKSpriteNode spriteNodeWithColor:[SKColor greenColor] size:CGSizeMake(100, 30)];
topWithText.position = CGPointMake(100, 110);
[topWithText addChild:labNode];
SKSpriteNode *bottom = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(100, 10)];
bottom.position = CGPointMake(100, 100);
[self addChild:topWithText];
[self addChild:bottom];
[topWithText runAction:[SKAction sequence:#[
[SKAction waitForDuration:3.0],
[SKAction scaleBy:3.0 duration:3]
]]];
With the SKShapeNode, this is impossible.
I solved it by adding a move Action to center the node manually.
You need to apply this to the y and x coordinates
I want to visible portion of sprite while on touching screen.
when i touch on the spriteModelHair touch location should be visibel and rest of the part of the sprite should be not visible.]
spriteModelHair = [CCSprite spriteWithFile:#"hair001.png" rect:CGRectMake(0, 0, 450, 612)];
spriteModelHair.position = ccp(winSize.width/2, winSize.height/2+25);
spriteModelHair.visibel = No;
[self addChild:spriteModelHair z:2];
Get the RGBA data of each pixel and each pixel's position on the screen. If the location of your touch is the same as one of the pixel's locations (or in a predefined area around the touch) change that pixel's alpha to 0 or something.
UIImageViews have a property called contentMode that you can use as
imageView.contentMode = UIViewContentModeScaleAspectFit;
and it will fill the entire view with your image without distorting, even if it has to bleed the image to do that.
Is there any similar stuff on Cocos2D? Sorry about the question, but I am new to Cocos2d.
I am creating the sprite like this:
CCTexture2D *textBack = [[CCTexture2D alloc] initWithImage:image];
CCSprite *sprite = [CCSprite spriteWithTexture:textBack];
thanks.
The equivalent method to performing a UIViewContentModeScaleAspectFit would be the .scale property. When a CCNode (or any of the sub nodes such as CCSprite etc.) is first created, the scale property is 1. Keep increasing it to scale the sprite up proportionally.
sprite.scale = 2.0f; // Scales the sprite proportionally at a factor of 2
As for it fitting to a specific size, you would have to write a routine:
Pass in desired rect and CCSprite bounding box rect.
Scale the box rect to aspect fit the desired rect.
Return the scaling factor
The result can then be applied to the CCSprite.scale property.
You can certainly scale the sprite to do that...
sprite.scale = ?
sprite.scaleX = ?
sprite.scaleY = ?
but I don't believe there is a function to automatically fill the entire screen. If you don't get a definitive reply here I would suggest posting on the Cocos2D forums (http://www.cocos2d-iphone.org/forum/).
I'd like to know how to increase the width of a sprite through an animation.
CCSprite *waterImage = [CCSprite spriteWithFile:#"water.png"];
waterImage.position = ccp(10,20);
waterImage.scaleY = 1.0;//6.5;
[self addChild:waterImage];
I want to scale the image of the sprite on the Y axis through an animation. Please, if you have any tutorials, then share them with me.
You can use runAction to animate the scaling of your image like this,
[waterImage runAction:[CCScaleTo actionWithDuration:5 scaleX:6.5 scaleY:1]];
Provide "scaleY:1" so that image only scale on x-axis.
Hope it helps