I am following this great Smooth line drawing tutorial for my game,
http://www.merowing.info/2012/04/drawing-smooth-lines-with-cocos2d-ios-inspired-by-paper/#.U1kiCJG6_Ez
My problem is that I can't get collision of line.
If your line is a list/array of multiple line segments (which is the case for the tutorial link), As new line objects are added, check against all previous segments in your array for intersection.
This can be done rather easily, as there are multiple solutions on stackoverflow on how to detect line intersection.
In the example code, everything is just rendered on the screen. No part of a collision detection system is implemented.
For implementing one of those, one of the simplest ways is to put all the points that make up the line in an NSMutableArray, and every time you want to draw a new point, you can check it against all the points contained in the array. If the new point is already contained in the array, then you have a collision between the line and the new point you are trying to draw.
From there on, you can research standard collision systems, and implement one of those.
Cocos2D also supports 2 physics engines: Box2D and Chipmunk, both of which have collision detection of their own. For efficiency, you might want to use one of those instead of implementing your own system.
Related
I am making a relatively simple isometric map using SpriteKit. I've tried both using the editor as well as creating it through code, and each time, it seems to have some "weighting" between the various tiles even though they should overlap gracefully given that I'm just setting the styling of a tile.
Here is an example of me using the tiles from https://kenney.nl. The green is just a standard grass patch and the road is the same exact size as it.
When I create this map in the XCode UI or if i iterate through in code and paint them, this continues to occur.
However, if I was to do something like flip the tiles around and paint it all with roads with grass in the middle, it then seems to sort whichever tile there are "more of" like in this example:
If i go and make more of one tile group over another, it seems to overpower it.
So my question is, how can I keep them from using this behavior? I've tried different tilemaps together, nested them inside of eachother etc... But at the end of the day, I cant get different tiles to exist at the same "plane". I've tried with code, the UI, etc. I'd like to use the SKTileMap if possible to use the downstream features as opposed to doing all of the math myself, like in the approach in this article (http://bigspritegames.com/isometric-tile-based-game-part-1/)
I have stumbled upon an interesting problem and I am not sure how to solve it. I have a line graph on which data points are marked with circular dots. At the moment I am creating one CAShapeLayer for the line itself and also CAShapeLayer for each dot.
The line is being animated with the strokeEnd animation key path. And it is working. However, the slightly negative effect is that once I open the graph I see all the data points already drawn and then a line is being animated through them.
Ideally I would like to change this behaviour in such a way that at the beginning nothing is shown and as the line gets animated data points are being drawn once the line passes through them.
I was thinking about this problem for some time now and I cannot find an elegant way of solving it. It seems to me that there should be a fairly easy way of achieving what I want. Maybe I should create a compounded path (but then how do I specify that a line needs to be stroked whereas dots need to be filled?).
Could anyone please guide me in the right direction?
There are lots of ways to handle this.
Assuming that the X increments of your graph are constant, and you're using linear timing, you could simply divide the total animation time by the number of data-points, and calculate the times when you need to add points to the graph when the line progresses to that X position. Simply add dot shape layers to the parent view's layer at the appropriate time intervals.
You could also change your drawing method to add new line segments to your graph path one at a time, on a timer, and add dot shapes at the same time. That would give you a step-by-step animation rather than a smooth line drawing.
I would like to create a textured terrain in SpriteKit similar to the one in the game Tiny Wings. Using cocos2d, I was able to follow Ray W's tutorial and get the look I wanted...
http://www.raywenderlich.com/32954/how-to-create-a-game-like-tiny-wings-with-cocos2d-2-x-part-1
Is plotting points to make triangles to fill with a repeating texture (or something similar) possible using SpriteKit?
Thanks in advance.
yeah you can create a game like tiny wing with sprite kit
step create serval CGMutablePath using http://dazchong.com/spritekit/ tool its a online SKPhysicsBody Path Generator and save them in a NSMutableArray array suppose you have only one level in your game for multiple level create multiple NSMutableArray array with multiple random saved CGMutablePath items
be sure all CGMutablePath have static physics body don't make it dynamic now
inside your init function add all paths one by one in a order that first path ends start of second path and so on make by this you can make a huge loop of serval path which are connecting with each other.
don't make more paths because too many physics body makes your game slow
now inside update function move all item of your array from right to left be sure
when you reach last item of your NSMutableArray array add it again at the begging of your looping algo.
-(void)update:(CFTimeInterval)currentTime {
}
make a tiny bird and give it a dynamic physics body
set collision and contact category of tiny bird as well as your loop paths
now inside didBeginContact function you can get contact between your tiny bird and path .now you can apply a little Impulse or you can get contact.collisionImpulse between your bird and path apply apply that value to the bird acc to your game
-(void)didBeginContact:(SKPhysicsContact *)contact
{
//contact
CGPoint contactPoint=CGPointMake(0, 0);
}
So it seems what I need to use (or at least I had in mind) are vertex shaders, but those are not currently supported in Spritekit. Right now, only fragment shaders are allowed from what I could find.
I did however see that you can create an SKShapeNode and set its texture property. The only problem with this is there is no option to "tile" that image throughout the SKShapeNode.
I did find this which seems to solve that issue (although I have not tried it out).
https://gist.github.com/man1/413642637ebd0b00fe2b
Seems like quite a work around!
In the end, I decided to use Cocos2d for this project as it supports both vertex and fragment shaders. With a bit of trial and error, I got it to work wonderfully.
I have been struggling with this problem for a time and being unable to solve it led me here. I'm recently new to Actionscript (2.0). I want to do something similar to:
http://gnarshmallow.com/
Were i want something to be painted behind a moving object in real time.
I would like some advice on how to approach the problem.
You need to use line drawing to do this. You will need two points, and it will draw a line from one to the next. I recommend having it run on every movement call. Have it draw the line between the racer's location in the previous frame, and his location in the current frame. For further reference, check out this page.
http://www.actionscript.org/resources/articles/730/1/Drawing-lines-with-AS2/Page1.html
I'm trying to draw lines in Cocos2d using touches.
I had a system where it would just add a small sprite where you touched, but it's working terribly. So I've been trying to find a way to draw actual lines using a method like ccDrawLine, but every tutorial I find seems to leave out something, and I just can't figure it out.
I've found this tutorial, Drawing line on touches moved in COCOS2D but I don't understand a few things about that.
It seems to reference the same variable from two different files, so I don't understand how it's doing that. (The naughtyTouchArray variable)
I can't find a complete guide on drawing lines, so sorry for the codeless question, but I'm getting frustrated.
Thanks.
The answer you've linked in your question provides good solution to your problem. There is no "two different files". Just two different methods of one layer. One method (ccTouchesMoved:withEvent:) handles touches and fill the array of points to be connected to each other one-by-one with lines. From cocos2d documentation, all drawing must be placed in the draw method of the node. So, another (draw) method just draws lines according to the given array. Cocos2d is based on OpenGL and it fully redraws scene every tick, so you cannot just draw new line. You had to draw all of them.
Or any other node can draw your array in it's draw method, so you can simply pass stored array of points from the layer, that detects touches, to this node.