piranha

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About piranha

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  1. Hi Been working on a top down car game for quite a while and creating my own render using 2d canvas. Looked at pixiJS and decided to update the render with that to get the benefit from webGL and perhaps other nice useful features that I don't know about yet. I create tiles in photoshop, draw the map in many layers in Tiled and then in my game I pre render all background layers and my foreground layers into 2 large canvases stored in memory which I then use to draw what the player sees based on my camera that is tracking the hero. Now that I'm switching to pixiJS I'm confused about a couple of things. I've been searching, and going through some great tutorials, explanations and documentation but still feel I want to ask for some help here. My current setup is that I do the same prerender as before and then add my background and foreground as sprites like this: this.layers[zLevel] = new pixiJS.Sprite(pixiJS.Texture.fromCanvas(this.offScreenCanvas[zLevel])); if (zLevel === 'background') { this.layers[zLevel].zOrder = 20; } else { this.layers[zLevel].zOrder = 10; } this.pixiApp.stage.addChild(this.layers[zLevel]); Question 1: Is this approach recommended (I know this consumes memory and if the map is too big I'll need to split into smaller chunks) ? I'm also confused about sprite vs texture. I could not get my background to show up unless I turned it into a sprite. Question 2: How do I control which layer is on top of the other? I tried in this example to place background above foreground but that didn't work. My cars should be positioned between background and foreground, how do I accomplish that? In my old version I draw my layers like this: this.ctx.drawImage( this.preRender.offScreenCanvas[zLevel], // image camera.x, // source x camera.y, // source y camera.width, // source width camera.height, // source height 0, // target x 0, // target y camera.width, // target width camera.height // target height ); Question 3: How should I approach the camera in pixi? It seems like I should just change x and y of my background sprites to accomplish the same effekt. Is that the right approach? Question 4: When looking at the examples in pixijs: http://pixijs.github.io/examples/#/basics/basic.js or kitty kat attack tutorial: https://github.com/kittykatattack/learningPixi#introduction I keep seeing thing things done different all the time. is one of them out of date? For example in kittykatattack they call renderer.render at the end of each example. /piranha
  2. I started working on a top down racing game as fun project a while back. I didn't use any game framework. Only node.js, express.js, socket.io and bunch of node modules and webpack. I got a working prototype where I can drive around and get real time sync between players that was good enough for now. The next thing I started on was collision detection. After a while I realised that I need some framework for it rather than create my own thing. After some research I started looking at phaser and finally bought box2d plugin for phaser which included a simple top down racing game as a example. I spent some time on tweaking parameters and got a result I was happy with. So I brought phaser into my project and got problems with pixi.js on the node server because there are no dom elements and pixi seems to be baked into phaser. After some googling it seems like running phaser on the server is a bad idea, but I only wanted box2d anyway. So I got a box2d version called box2dweb and tried to create the same thing that I had working in phaser + box2d. After getting errors I couldn't figure out it turns out after some googling that there is missing functionality (edgeChains) in box2dweb. So I try all the other implementations of box2d in JS that I can find and all of them reports errors (different errors with each version) and it's code that works fine in the box2dweb version. Sigh. I can not be the first person wanting to do a real time multiplayer game using node and box2d. Any advice how to move forward?
  3. Hi. I'm using tiled to create maps for my game. I want to create polygons in the tile collisions editor so when I place a certain tile, lets say a curve with a fence I always want a collision poly along the fence. Currently my curve is made of 6x6 tiles so I load the curve as a tile map in tiled. The tile collisions editor only allow me to add objects per tile. I want a object on the entire tile map instead so whenever I place a curve I get the collision part too. If I would make my tile map into a single tile the problem is that I have to draw 6x tile columns and rows outside the camera or track pieces will popup when the top left 64 x 64 tile enters the camera. (This is my own drawing function created before I found phaser, will phaser drawing do it different?) So basically I want to treat my tile map as 64 x 64 tiles that my game draw while I want collision objects to be active as soon as part of the tile map is drawn. I would prefer if I don't have to create my collision polys as a separate layer after creating the map. Any tips on how to solve this problem?
  4. Thanks a lot for your replies. I was able to get a really nice result after fiddling around with the ideas I got from your replies and example.
  5. Hi I have a scaling question. I'm working on a multiplayer tile based driving game where the camera is following the car. I want players to see the same of the map regardless of their screen resolution. So for example if I have 1024x768 as my base size and tiles are 64x64 pixels which will mean 1024 / 64 = 16 tile cols will be visible to the player. If someone opens my game with 1280x1080 as their resolution I don't want them to see 1280 / 64 = 20 tiles but instead scale the graphics and tiles to 1280 / 16 = 80 x 80 pixels per tile. Is there any automated way of doing this or do I need to manually calculate everything and scale all my art?
  6. Hi I'm working on a top down racing game. Yesterday I decided to buy the box2d plugin for phaser to get collision physics. There is a simple top down racing game included as a tutorial which I tried out and the collision part was good enough for my needs. But the actual driving physics were not because it was more like a spaceship. If you would stop pressing forward the car would continue in current direction until slowed down. But when I turn during this sliding a car should go where the wheels point and not in its current direction like a spaceship. So I decided to add my own driving physics to the demo which makes the car go in the direction of the wheels and instead of activating car.body.thrust(power) on key UP I call my function that ultimately sets car.body.x and car.body.y so it moves correct. The problem is that now I'm not colliding with the walls anymore because the box2d simulation is just getting the coordinates and doesn't move the car any more. I would like to use box2d as much as possible but I couldn't figure out how to make the car not slide like a spaceship and if possible I want to avoid having to create my own collision detection. Any tips on how to approach this?