canvas实现鼠标可交互可拖动网的蜘蛛爬网动画效果代码-html代码-BFW代码库

canvas实现鼠标可交互可拖动网的蜘蛛爬网动画效果代码

代码语言：html

所属分类：动画

代码描述：canvas实现鼠标可交互可拖动网的蜘蛛爬网动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
<style>
    body{
        background: white;
    }
</style>

</head>
<body>

<canvas id="web"></canvas>

  <script>
      !function(e,t,n){function i(n,s){if(!t[n]){if(!e[n]){var o=typeof require=="function"&&require;if(!s&&o)return o(n,!0);if(r)return r(n,!0);throw new Error("Cannot find module '"+n+"'")}var u=t[n]={exports:{}};e[n][0].call(u.exports,function(t){var r=e[n][1][t];return i(r?r:t)},u,u.exports)}return t[n].exports}var r=typeof require=="function"&&require;for(var s=0;s<n.length;s++)i(n[s]);return i}({1:[function(require,module,exports){var VerletJS=require("./verlet");var constraint=require("./constraint");require("./objects");window.Vec2=require("./vec2");window.VerletJS=VerletJS;window.Particle=VerletJS.Particle;window.DistanceConstraint=constraint.DistanceConstraint;window.PinConstraint=constraint.PinConstraint;window.AngleConstraint=constraint.AngleConstraint},{"./verlet":2,"./constraint":3,"./objects":4,"./vec2":5}],3:[function(require,module,exports){exports.DistanceConstraint=DistanceConstraint;exports.PinConstraint=PinConstraint;exports.AngleConstraint=AngleConstraint;function DistanceConstraint(a,b,stiffness,distance){this.a=a;this.b=b;this.distance=typeof distance!="undefined"?distance:a.pos.sub(b.pos).length();this.stiffness=stiffness}DistanceConstraint.prototype.relax=function(stepCoef){var normal=this.a.pos.sub(this.b.pos);var m=normal.length2();normal.mutableScale((this.distance*this.distance-m)/m*this.stiffness*stepCoef);this.a.pos.mutableAdd(normal);this.b.pos.mutableSub(normal)};DistanceConstraint.prototype.draw=function(ctx){ctx.beginPath();ctx.moveTo(this.a.pos.x,this.a.pos.y);ctx.lineTo(this.b.pos.x,this.b.pos.y);ctx.strokeStyle="#d8dde2";ctx.stroke()};function PinConstraint(a,pos){this.a=a;this.pos=(new Vec2).mutableSet(pos)}PinConstraint.prototype.relax=function(stepCoef){this.a.pos.mutableSet(this.pos)};PinConstraint.prototype.draw=function(ctx){ctx.beginPath();ctx.arc(this.pos.x,this.pos.y,6,0,2*Math.PI);ctx.fillStyle="rgba(0,153,255,0.1)";ctx.fill()};function AngleConstraint(a,b,c,stiffness){this.a=a;this.b=b;this.c=c;this.angle=this.b.pos.angle2(this.a.pos,this.c.pos);this.stiffness=stiffness}AngleConstraint.prototype.relax=function(stepCoef){var angle=this.b.pos.angle2(this.a.pos,this.c.pos);var diff=angle-this.angle;if(diff<=-Math.PI)diff+=2*Math.PI;else if(diff>=Math.PI)diff-=2*Math.PI;diff*=stepCoef*this.stiffness;this.a.pos=this.a.pos.rotate(this.b.pos,diff);this.c.pos=this.c.pos.rotate(this.b.pos,-diff);this.b.pos=this.b.pos.rotate(this.a.pos,diff);this.b.pos=thi.........完整代码请登录后点击上方下载按钮下载查看