This is a sample code to move a body in Box2D . First you have to make a body with variable name “moving_rec” and call the below function in a schedular at regular intervals. -(void) moveBody{ b2Vec2 force = b2Vec2(0,0); force = b2Vec2(0,3); //Giving the x an y to negative will move the body in… Read More »
Hi, Collision can be detected simply using the following lines of code with box2D. Here aimFixture & tarFixture are two custom fixtures whose collision you want to find out. 🙂
The below code is for FlashBuilder 4, If you are using FlexBuilder3 use addChild() instead of the commented block in the following code.
Use CCMenuItemSprite and CCMenu in iPhone to create menu. call this function to set up the menu for your home page in your iPhone game or you can change this code directly to ANDROID and it will work. Make sure you have all the images mentioned in the above example. This menu will appear on… Read More »
Use CCMenuItemSprite and CCMenu in iPhone to create menu. call this function to set up the menu for your home page in your iPhone game or you can change this code directly to ANDROID and it will work. Make sure you have all the images mentioned in the above example. This menu will appear on… Read More »
Use CCMenuItemSprite and CCMenu in iPhone to create menu. call this function to set up the menu for your home page in your iPhone game or you can change this code directly to ANDROID and it will work. Make sure you have all the images mentioned in the above example. This menu will appear on… Read More »
Use CCMenuItemSprite and CCMenu in iPhone to create menu. call this function to set up the menu for your home page in your iPhone game or you can change this code directly to ANDROID and it will work. Make sure you have all the images mentioned in the above example. This menu will appear on… Read More »
Hi, For removing the forces applied to your Box2D bodies, use the following line of code. Here ‘yourWorld’ is the your box2D world. 🙂
Hi, For destroying physics bodies in Corona SDK, use any of the following methods. OR Note : While Box2D objects will be safely retained until the end of the current world step, their Lua references will be deleted immediately. Therefore, be careful not to accidentally delete the same Lua object more than once. This situation… Read More »
Hi, How can you detect single/double/triple taps in iPhone using Objective C? Use the following code to detect single or multiple taps in iPhone/iPad/iPod. The code can also be used with Cocos2D & Box2D. Try it out! You can even detect Quadrup! 🙂
Hi, How can you identify the sprite associated with a particular body while using box2D ? Sometimes you may need to identify the sprite associated with the body you are using. For that use the following line of code. Now you got the corresponding sprite in your ‘yourSprite’ 🙂
Hi, Sometimes you may want to detect shake gesture in iPhone using your programs. But how can you detect shake gesture in iPhone? Shake gesture in iPhone can be detected by using the accelerometer. The following lines of code can be used for detecting the shake gesture in iPhone. You can use these lines of… Read More »
Hi, If you are a game developer and you are using box2D for real world simulations, you would probably need a particular body to be removed from the box2D world! But how can you remove box2D body from world ? See the following sample code which does the same. – (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {… Read More »
Hi, While using Box2D , in many cases you may need to connect two bodies together. But the collision between them during motion is not what you preferred! So how can you prevent those bodies being connected in Box2D from collision? Use the line of code to prevent the collision. jointDef.collideConnected = false;
This simple code plays a music…….. [[SimpleAudioEngine sharedEngine] playBackgroundMusic:@”my_music.mp3″]; For stopping the music use this……. [[SimpleAudioEngine sharedEngine]stopBackgroundMusic]; To pause the music use this line of code….. [[SimpleAudioEngine sharedEngine] pauseBackgroundMusic];
Gear joints are one of the real specialities of Box2D. By creating gear joints between two bodies you can actually simulate a real world gear. For creating a gear joint you need two bodies connected by a revolute or prismatic joint. The below code creates two bodies in the shape of a circle which is… Read More »
For an interactive game building using Box2D, collision detection of Box2D bodies is necessary. There is an easy way to implement collision detection in Box2D. For checking whether two bodies have collided with each other in Box2D while using it with cocos2D, then use the following lines of code where ever you want to check… Read More »
Hi, In certain situations you may need to remove all the forces you have applied on different bodies in your box2D world. Then what to do? Removing all the forces from the bodies in the box2D world is simple. Just use the single line of code. yourWorld->ClearForces(); Here yourWorld is your Box2D world. Simple, isn’t… Read More »
The below function creates a polygon in the shape of a triangle. Please call the debugdraw function inside your update method to view the results. Make sure you import the Box2D classes into your file. public function init():void { debug_draw(); addEventListener(Event.ENTER_FRAME, update); createTriangle(); } public function createTriangle():void { var fd : b2FixtureDef = new b2FixtureDef();… Read More »
Everyone will be fascinated how flash games are built on the web that implements the real world physics. Well for your information there are a lot of physics engines available. One of them is the Box2D. Box2D was written in C++. Then it was converted to flash. So now I am going to show you… Read More »
Here mybody is a body to which I am connecting a pinpoint. The pin joint is between the world and the body. So it will appear as hanging in the wall if the gravity is downwards. ‘The ground’ is the other body to which the my_body is connected. First you create a big ground body… Read More »
You can iterate through all bodies in the world and check whether you have touched a particular body. You can get all the userdata from the current body The userdata contains the width, height, sprite etc. Just Log the userdata in the current body to see all these. for (b2Body* b = world->GetBodyList(); b; b… Read More »
Below code is a simplest way to do that.
You can check it by using the TestPoint function available for the Fixtures.
write the below code in “ccTouchesBegan” function and you are done. Here the ballBody represents the bullet body. You can increase the power variable to increase bullet speed.