Paralaxer: New 2d game.

Tagged: 2d, Box2D, ladders, paralaxer

This topic has 2 voices, contains 8 replies, and was last updated by Nat Weiss 336 days ago.

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July 8, 2012 at 1:47 am #2566
stmaddox	Has anyone else downloaded the new 2d kit? It seems to work pretty well. I have not looked into Box2d so I need to study that and C++ a little. I tried for fun changing the tile map to one I had already made but it worked weird. It was probably that my tiles were 64 x 64 pixels which I don’t think works well with Box2d.
July 10, 2012 at 1:46 am #2572
stmaddox	Nat, I substituted my art for a Player into Paralaxer and noticed that the setStandingFrame has Jump instead of Standing. When my player was standing still he was in a Jump frame. Also, when he quits walking, he doesn’t stand still but uses a walk frame. Haven’t found how to fix this yet. I had modified the iPhone game kit to a 2d with gravity but I think I like the box2d version better. In my version I had ladders so player could climb. Not familiar with box2d yet so do you have any hints as to how to implement ladders?
July 12, 2012 at 12:36 am #2583
Nat Weiss	Yep, the artwork for the character in Paralaxer is a little different, so that’s why your character profile isn’t translating over perfectly. Check out Player.cpp and all the places where it calls “spriteFrameForKey” and also “animate” and modify as necessary. Regarding ladders, this will definitely be something I cover in the Cocos2d-X Book in the Ladders, Water, Speech chapter. Though here’s a quick overview: 1. Make an object that represents the ladder. Get some graphics for it and size it correctly in the level. 2. Make sure the object has a collision box that is the same size as the graphic. Turn on kDrawDebugBoxes in Paralaxer.h to see. 3. Check out Level.cpp’s BeginContact function. That’s where the Box2d collision detection callback starts. 4. See how it calls the Player’s beginContact function? You’ll need to edit the Player’s beginContact function to handle being on the ladder. You can either counteract gravity with an impulse or cancel out the Player’s velocity. Basically, this is where you’ll need to program all the ladder functionality. I can’t say much here because I haven’t written it yet.
July 12, 2012 at 9:39 pm #2594
stmaddox	I didn’t notice the ladders topic on the book you are writing. I will slow down and wait until you post your chapters before I ask questions. Thanks.
July 15, 2012 at 12:13 am #2606
stmaddox	I guess there is no current direction for the player so if I have him stand I can’t make sure he is facing the same direction he was walking? I think I can add a variable to keep track of direction in walk part of update.
July 16, 2012 at 7:46 pm #2611
Nat Weiss	You can keep track of the direction by testing if the player has his sprite flipXed. In the player’s code, you can do something like this: if( this->sprite->isFlipX() )
July 18, 2012 at 9:24 pm #2619
stmaddox	I changed all the fixes I put in back to original but kept my art. I then changed the jump rotation to zero and I figured out what was confusing me. If you have walked then the jump works. If you jump in the opposite direction of last jump without moving then you jump backwards. I will try the above code you gave me in the touch or jump area. Just an idea for book if there is a place for it, doing sloped ground to slide down etc. I haven’t checked out the tile map part yet but I suspect that in box2d that for each tile it uses a square as the body. The other day I died over a barrel and my dead body kept bouncing up and down. I thought that was really funny.
July 19, 2012 at 1:06 am #2620
stmaddox	Okay I added a line this->sprite->setFlipX( jumpXVelocity < 0.0f ); in the touch method in jump area and everything works great.
July 19, 2012 at 2:20 am #2623
Nat Weiss	Nice! By the way, here’s a great article on slopes: http://higherorderfun.com/blog/2012/05/20/the-guide-to-implementing-2d-platformers/

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