本文实例为大家分享了H5 canvas投篮小游戏实现代码，供大家参考，具体内容如下
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title></title> </head> <body onload="init(19,'mylegend',820,500,main,LEvent.INIT)"> <div id="mylegend">loading......</div> <script src="js/Box2dWeb-2.1.a.3.js"></script> <script src="js/lufylegend-1.10.1.js"></script> <script type="text/javascript"> var backLayer,cLayer,enemy,gameOver=false,all=0,aim=0,bitmap,checkpoint=1; var point={x:100,y:250}; var imgList={}; var imgData=new Array( {name:'face',path:'../JQueryTest/images/L8.png'} ); function main(){ LLoadManage.load(imgData); LGlobal.box2d=new LBox2d(); backLayer=new LSprite(); addChild(backLayer); //建立一组墙壁 //backLayer.graphics.drawRect(1,"#cc3300",[0,0,800,10],true,"#cc3300"); backLayer.graphics.drawRect(1,"#cc3300",[790,0,10,400],true,"#cc3300"); backLayer.graphics.drawRect(1,"#cc3300",[0,0,10,400],true,"#cc3300"); backLayer.graphics.drawRect(1,"#cc3300",[0,390,800,10],true,"#cc3300"); backLayer.graphics.drawRect(1,"#cc3300",[450,187,50,3],true,"#cc3300");//1 backLayer.graphics.drawRect(1,"#cc3300",[500,170,3,20],true,"#cc3300");//2 backLayer.graphics.drawRect(1,"#cc3300",[447,187,3,210],true,"#cc3300");//3 backLayer.graphics.drawRect(1,"#cc3300",[538,87,3,103],true,"#cc3300");//4 框半径35 backLayer.graphics.drawRect(1,"#cc3300",[541,137,70,3],true,"#cc3300");//5 backLayer.graphics.drawRect(1,"#cc3300",[611,137,3,263],true,"#cc3300");//6 cLayer=new LSprite(); backLayer.addChild(cLayer); //通过顶点坐标数组，加入上下左右四面墙 var shapeArray=[ //[[0,0],[800,0],[800,10],[0,10]], [[790,0],[800,0],[800,400],[790,400]], [[0,0],[10,0],[10,400],[0,400]], [[0,390],[800,390],[800,400],[0,400]], [[450,187],[500,187],[500,190],[450,190]], [[500,170],[503,170],[503,190],[500,190]], [[447,187],[450,187],[450,397],[447,397]], [[538,87],[541,87],[541,190],[538,190]], [[541,137],[611,137],[611,140],[541,140]], [[611,137],[614,137],[614,400],[611,400]] ]; cLayer.addBodyVertices(shapeArray,0,0,0,0.5,0.4,0.5); //加入圆 用来添加点击事件来出现小球 circle=new LSprite(); backLayer.addChild(circle); circle.graphics.drawArc(1,"#336699",[point.x,point.y,40,0,2*Math.PI,true,"#336699"]); //添加游戏说明栏 shuoming=new LTextField(); shuoming.x=20; shuoming.y=10; shuoming.text='点击左侧圆圈进行投篮,鼠标和圆心的距离控制投篮力度'; backLayer.addChild(shuoming); //添加得分栏和命中率栏 defen=new LTextField(); defen.x=200; defen.y=100; defen.text='得分：0'; backLayer.addChild(defen); mingzhong=new LTextField(); mingzhong.x=280; mingzhong.y=100; mingzhong.text='命中率：0%'; backLayer.addChild(mingzhong); //关卡显示 guanqia=new LTextField(); guanqia.x=120; guanqia.y=100; guanqia.text='关卡：'+checkpoint; backLayer.addChild(guanqia); //加入鼠标事件 点击鼠标增加小球 backLayer.addEventListener(LMouseEvent.MOUSE_DOWN,createBox); //键盘事件 //LEvent.addEventListener(window,LKeyboardEvent.KEY_DOWN,down); } function createBox(e){ if((e.offsetX-point.x)*(e.offsetX-point.x)+(e.offsetY-point.y)*(e.offsetY-point.y)>40*40)return; var box01=new LSprite(); box01.name='mybox'; box01.x=e.selfX; box01.y=e.selfY; backLayer.addChild(box01); box01.graphics.drawArc(1,"orange",[16,16,16,0,360*Math.PI/180],true,"orange"); box01.addBodyCircle(16,0,0,1,1,0.5,0.6); var angle=Math.atan2(e.offsetY-point.y,e.offsetX-point.x); var force=(Math.sqrt((point.y-e.offsetY)*(point.y-e.offsetY)+(e.offsetX-point.x)*(e.offsetX-point.x))/20)*330; var vec=new LGlobal.box2d.b2Vec2(force*Math.cos(angle),force*Math.sin(angle)); box01.box2dBody.ApplyForce(vec,box01.box2dBody.GetWorldCenter()); function check(){ if(box01.x<610&&box01.x>450&&box01.y<400&&box01.y>180){ checkpoint++; aim++; all++; defen.text='得分：'+aim; mingzhong.text='命中率：'+Math.floor(aim/all*100)+'%'; if(checkpoint==2){//第二关 rail=new LSprite(); backLayer.addChild(rail); rail.graphics.drawRect(1,"#cc3300",[220,135,10,255],true,"#cc3300"); raill=new LSprite(); backLayer.addChild(raill); raill.addBodyVertices([[[220,135],[230,135],[230,390],[220,390]]],0,0,0,0.5,0.4,0.5); }else if(checkpoint==3){//第三关 backLayer.removeChild(rail); backLayer.removeChild(raill); rail=new LSprite(); backLayer.addChild(rail); rail.graphics.drawRect(1,"#cc3300",[220,35,10,355],true,"#cc3300"); raill=new LSprite(); backLayer.addChild(raill); raill.addBodyVertices([[[220,35],[230,35],[230,390],[220,390]]],0,0,0,0.5,0.4,0.5); }else if(checkpoint==4){//第四关 backLayer.removeChild(rail); backLayer.removeChild(raill); rail=new LSprite(); backLayer.addChild(rail); rail.graphics.drawRect(1,"#cc3300",[10,180,200,10],true,"#cc3300"); raill=new LSprite(); backLayer.addChild(raill); raill.addBodyVertices([[[10,180],[220,180],[220,190],[10,190]]],0,0,0,0.5,0.4,0.5); }else if(checkpoint>4){//通关 checkpoint=4; alert('终于通关了！'); } guanqia.text='关卡：'+checkpoint; }else{ all++; mingzhong.text='命中率：'+Math.floor(aim/all*100)+'%'; } } setTimeout(check,2600); } //键盘按下 移动枪口 function down(e){ if(e.keyCode=='37'){//left point.x-=10; }else if(e.keyCode=='39'){//right point.x+=10; }else if(e.keyCode=='38'){//up point.y-=10; }else if(e.keyCode=='40'){//down point.y+=10; } backLayer.removeChild(circle); circle=new LSprite(); backLayer.addChild(circle); circle.graphics.drawArc(1,"#336699",[point.x,point.y,40,0,2*Math.PI,true,"#336699"]); } </script> </body></html>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。