search
HomeWeb Front-endH5 TutorialHTML5 game development-Box2dWeb application (1)-Create various rigid bodies

At the beginning of this article, we will introduce the new functions of lufylegend-1.4.0, how to create a physical world and various rigid bodies in this physical world with box2dweb

Preparation

First you need to download the html5 open source library lufylegend-1.4.0

http://blog.csdn.net/lufy_legend/article/details /7644932

box2dweb You can download it here

http://code.google.com/p/box2dweb/downloads/list

Prepare three pictures,


are used to create circular, rectangular and triangular rigid bodies respectively.

Ready to finish, now start production.
The following is to use the LLoadManage class in lufylegend.js to read the image

init(10,"mylegend",800,400,main);
var backLayer,cLayer,wallLayer,bitmap,loadingLayer;
var imglist = {};
var imgData = new Array(
		{name:"bird1",path:"./images/bird1.png"},
		{name:"bird2",path:"./images/bird2.png"},
		{name:"stage01",path:"./images/stage01.png"}
		);
function main(){	
	LGlobal.setDebug(true);	
	backLayer = new LSprite();	
	addChild(backLayer);	
	
	
	loadingLayer = new LoadingSample3();
	backLayer.addChild(loadingLayer);	
	LLoadManage.load(
		imgData,
		function(progress){
			loadingLayer.setProgress(progress);
		},
		function(result){
			imglist = result;
			backLayer.removeChild(loadingLayer);
			loadingLayer = null;
			gameInit();
		}
	);
}

LGlobal.setDebug(true); is to turn on the debug mode, so that when creating a rigid body, all box2dweb will be The created debug rigid body is also displayed together. When releasing the finished product, the debug mode should be turned off.

The LLoadManage class has three parameters, $list, $onupdate, $oncomplete,

$list is the image array to be read, $onupdate is the function that needs to be called during reading, $oncomplete It is the function called when the reading is completed.

The LoadingSample3 class is the progress bar display function in the lufylegend.js library. In addition to the LoadingSample3 class, there are also the LoadingSample1 class and the LoadingSample2 class.

is created Before creating the rigid body, first create four walls, up, down, left and right, to control the movement range of the rigid body to be created later.

wallLayer = new LSprite();
	wallLayer.x = 400;
	wallLayer.y = 0;
	backLayer.addChild(wallLayer);
	wallLayer.addBodyPolygon(800,10,0);
	wallLayer = new LSprite();
	wallLayer.x = 0;
	wallLayer.y = 200;
	backLayer.addChild(wallLayer);
	wallLayer.addBodyPolygon(10,400,0);
	wallLayer = new LSprite();
	wallLayer.x = 400;
	wallLayer.y = 400;
	backLayer.addChild(wallLayer);
	wallLayer.addBodyPolygon(800,10,0);
	wallLayer = new LSprite();
	wallLayer.x = 800;
	wallLayer.y = 200;
	backLayer.addChild(wallLayer);
	wallLayer.addBodyPolygon(10,400,0);

For children who don’t know how to use LSprite, please read my previous articles. I won’t be too wordy here.

addBodyPolygon(w,h,type,density,friction,restitution) is to add a rectangular body to LSprite, the parameters are, (width, height, static or dynamic, density, friction, elasticity)

If the third parameter sets the body to be static, the following parameters can be omitted. Here, the four walls are set to static.

Then, add a mouse click event to backLayer, and prepare to add a rigid body when the mouse clicks.


##

backLayer.addEventListener(LMouseEvent.MOUSE_UP,add);

Add a rigid body in the add method, first The simplest one is to add a circular rigid body. The code for adding a circular rigid body is as follows

	cLayer = new LSprite();
	cLayer.x = 50 + Math.random()*700;
	cLayer.y = 50;
	backLayer.addChild(cLayer);
	bitmap = new LBitmap(new LBitmapData(imglist["bird1"]));
	cLayer.addChild(bitmap);
	cLayer.addBodyCircle(bitmap.getWidth()*0.5,bitmap.getHeight()*0.5,bitmap.getWidth()*0.5,1,.5,.4,.5);

addBodyCircle(radius,cx,cy,type,density,friction,restitution) is to add a circular body to LSprite , the parameters are, (radius, circle center coordinates x, y, static or dynamic, density, friction, elasticity)

Okay, after running the code, keep clicking the mouse to get the following results


Test URL

http://lufy.netne.net/lufylegend-js/lufylegend-1.4/box2d/sample01/index.html

Next, modify the add method. In addition to adding a circular rigid body, there is a certain probability of adding a rectangular rigid body. The following

	var rand = Math.random();
	if(rand < 0.5){
		cLayer = new LSprite();
		cLayer.x = 50 + Math.random()*700;
		cLayer.y = 50;
		backLayer.addChild(cLayer);
		bitmap = new LBitmap(new LBitmapData(imglist["bird1"]));
		cLayer.addChild(bitmap);
		cLayer.addBodyCircle(bitmap.getWidth()*0.5,bitmap.getHeight()*0.5,bitmap.getWidth()*0.5,1,.5,.4,.5);
	}else{
		cLayer = new LSprite();
		cLayer.x = 50 + Math.random()*700;
		cLayer.y = 50;
		backLayer.addChild(cLayer);
		bitmap = new LBitmap(new LBitmapData(imglist["stage01"]));
		cLayer.addChild(bitmap);
		cLayer.addBodyPolygon(bitmap.getWidth(),bitmap.getHeight(),1,5,.4,.2);
	}

addBodyPolygon method has been introduced above, adding a rectangular rigid body to LSprite.

After running the code, keep clicking the mouse to get the following results

Test URL

http://lufy.netne.net/lufylegend -js/lufylegend-1.4/box2d/sample01/index2.html

Finally, add a triangular rigid body. The starting point can be any polygonal rigid body. The addBodyVertices method of LSprite is used,

addBodyVertices(vertices,cx,cy,type,density,friction,restitution) is to add any polygonal rigid body based on the vertex array. The parameters are (vertex array, center coordinates, static or dynamic, density, friction, elasticity)


It should be mentioned that there is a small bug in this method, which changes the coordinates of LSprite to (0,0), so you need to use the SetPosition method to re-set the coordinates of LSprite. This bug will be fixed next time in lufylegend.js It will be solved when it is updated. The code for adding the triangular rigid body this time is as follows

cLayer = new LSprite();
backLayer.addChild(cLayer);
bitmap = new LBitmap(new LBitmapData(imglist["bird2"]));
cLayer.addChild(bitmap);
var shapeArray = [
[[0,54],[27,0],[54,54]]
];
cLayer.addBodyVertices(shapeArray,27,27,1,.5,.4,.5);
cLayer.box2dBody.SetPosition(new LGlobal.box2d.b2Vec2((50 + Math.random()*700)/LGlobal.box2d.drawScale,50/LGlobal.box2d.drawScale));

After running the code, keep clicking the mouse to get the following results



Test URL

http://lufy.netne.net/lufylegend-js/lufylegend-1.4/box2d/sample01/index3.html

This article is over, the final code is presented, please look forward to the next tutorial





test
 
 


loading……

The above is the content of HTML5 game development-Box2dWeb application (1)-creating various rigid bodies. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!



Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
html5的div一行可以放两个吗html5的div一行可以放两个吗Apr 25, 2022 pm 05:32 PM

html5的div元素默认一行不可以放两个。div是一个块级元素,一个元素会独占一行,两个div默认无法在同一行显示;但可以通过给div元素添加“display:inline;”样式,将其转为行内元素,就可以实现多个div在同一行显示了。

html5中列表和表格的区别是什么html5中列表和表格的区别是什么Apr 28, 2022 pm 01:58 PM

html5中列表和表格的区别:1、表格主要是用于显示数据的,而列表主要是用于给数据进行布局;2、表格是使用table标签配合tr、td、th等标签进行定义的,列表是利用li标签配合ol、ul等标签进行定义的。

html5怎么让头和尾固定不动html5怎么让头和尾固定不动Apr 25, 2022 pm 02:30 PM

固定方法:1、使用header标签定义文档头部内容,并添加“position:fixed;top:0;”样式让其固定不动;2、使用footer标签定义尾部内容,并添加“position: fixed;bottom: 0;”样式让其固定不动。

HTML5中画布标签是什么HTML5中画布标签是什么May 18, 2022 pm 04:55 PM

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5中不支持的标签有哪些html5中不支持的标签有哪些Mar 17, 2022 pm 05:43 PM

html5中不支持的标签有:1、acronym,用于定义首字母缩写,可用abbr替代;2、basefont,可利用css样式替代;3、applet,可用object替代;4、dir,定义目录列表,可用ul替代;5、big,定义大号文本等等。

html5废弃了哪个列表标签html5废弃了哪个列表标签Jun 01, 2022 pm 06:32 PM

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

html5是什么意思html5是什么意思Apr 26, 2021 pm 03:02 PM

html5是指超文本标记语言(HTML)的第五次重大修改,即第5代HTML。HTML5是Web中核心语言HTML的规范,用户使用任何手段进行网页浏览时看到的内容原本都是HTML格式的,在浏览器中通过一些技术处理将其转换成为了可识别的信息。HTML5由不同的技术构成,其在互联网中得到了非常广泛的应用,提供更多增强网络应用的标准机。

Html5怎么取消td边框Html5怎么取消td边框May 18, 2022 pm 06:57 PM

3种取消方法:1、给td元素添加“border:none”无边框样式即可,语法“td{border:none}”。2、给td元素添加“border:0”样式,语法“td{border:0;}”,将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式,语法“td{border:transparent;}”,将td边框的颜色设置为透明即可。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)