JavaScript

语言：

JaveScriptBabelCoffeeScript

确定

// --------------------------

var app;

var fK;

var width, height, prevTime;

var halfWidth, halfHeight;

var canvas = document.getElementById('c');

var ctx = canvas.getContext('2d');

width = window.innerWidth;

height = window.innerHeight;

halfWidth = width / 2;

halfHeight = height / 2;

canvas.width = width;

canvas.height = height;

// ================

fK = 0.25;

var widthNum = 31;

var Point = function(){

};

Point.prototype = {

x : null,

y : null,

vel: 0,

mass : 10,

setPosY : function(value){

this.y = this.baseYPos = value;

}

};

var SmallCircle = function(){

};

SmallCircle.prototype = {

};

var MainShape = function(){

this.points = [];

var gapDistance = (width) / (this.pointNumber - 1);

var xPos;

var i;

for(i = 0; i < this.pointNumber; i++){

xPos = gapDistance * i;

var myPt = new Point();

myPt.x = xPos;

myPt.setPosY(0);

//myPt.y = 0;

this.points.push( myPt );i

}

this.particleSprings = [];

for(i = 0; i < this.pointNumber - 1; i++){

var spring = {iLengthY: this.points[i + 1].y - this.points[i].y };

this.particleSprings.push( spring );

}

//this.points[this.points.length - 1].y = 200;

};

/*

this.mcParticles[i].fXPos= this.mcParticles[i]._x;

this.mcParticles[i].fYAccel= 0;

this.mcParticles[i].fYVel= 0;

this.mcParticles[i].fYPos= this.mcParticles[i]._y;

this.mcParticles[i].fBaseYPos= this.mcParticles[i]._y;

this.mcParticles[i].iMass = 10;

*/

MainShape.prototype = {

pointNumber : widthNum,

particleSprings : [],

x : 0,

y : 0,

col : "#fff",

update : function(){

// calculation

var i;

for( i = 0; i < this.points.length; i++){

var fExtensionY = 0;

var fForceY = 0;

if(i > 0){

fExtensionY = this.points[i - 1].y - this.points[i].y - this.particleSprings[i-1].iLengthY;

fForceY += - fK * fExtensionY;

}

if( i < this.points.length - 1){

fExtensionY = this.points[i].y - this.points[i+1].y - this.particleSprings[i].iLengthY;

fForceY += fK * fExtensionY;

}

fExtensionY = this.points[i].y - this.points[i].baseYPos;

fForceY += fK/20 * fExtensionY;

this.points[i].acl = - fForceY;

this.points[i].vel += this.points[i].acl;

this.points[i].y += this.points[i].vel;

this.points[i].y += 0.2 * (this.points[i].baseYPos - this.points[i].y);

this.points[i].vel /= 1.2;

}

// ================

ctx.save();

ctx.translate(this.x, this.y);

ctx.beginPath();

ctx.lineWidth = 2;

/**

for( i = 0; i < this.pointNumber; i++){

if(i == 0) ctx.moveTo(this.points[i].x, this.points[i].y);

else ctx.lineTo(this.points[i].x, this.points[i].y);

}**/

for(i = 0; i < this.pointNumber- 1; i++ ){

var xPos = (this.points[i].x + this.points[i + 1].x)/2;

var yPos = (this.points[i].y + this.points[i + 1].y)/2;

if(i == 0) ctx.moveTo(xPos, yPos);

else ctx.quadraticCurveTo( this.points[i].x, this.points[i].y, xPos, yPos);

}

//ctx.closePath();

ctx.strokeStyle = this.col;

ctx.stroke();

ctx.restore();

},

setCircle : function(xPos, yPos){

for(var i = 0; i < this.points.length; i++){

var dx = xPos - this.x - this.points[i].x;

var dy = yPos - this.y - this.points[i].y;

var dis = Math.sqrt(dx * dx + dy * dy);

if(dis < 60){

this.points[i].y += 40;

}

}

},

addImpulse : function(){

//this.points[parseInt(this.points.length/2)].vel = .1;

}

};

var App = function(){

var kankakuHeight = 50;

var kankakuHeightNum = parseInt(height/kankakuHeight) ;

// createCircle

// width: widthNum \\ height: kankakuHeightNum

for(var i = 0; i < kankakuHeightNum; i++){

var mainShape = new MainShape();

mainShape.y = kankakuHeight * (i + 1);

this.mainShapeArr.push(mainShape);

}

};

App.prototype = {

mainShapeArr : [],

bgCol : "#333",

update : function(){

ctx.fillStyle = this.bgCol;

ctx.fillRect(0, 0, width, height);

this.mainShapeArr.forEach(function(element){

element.update();

});

},

xPos : 60,

yPos : 60,

kigoHeight : +1,

kigoWidth : + 1,

num : 12,

rad : 60,

addImpulse : function(){

this.yPos += this.kigoHeight * 50; //= (this.yPos + 50) % height;

if(this.yPos > height ) {

this.yPos = height;

this.kigoHeight = -1;

}

if(this.yPos < 0) {

this.yPos = 0;

this.kigoHeight = 1;

}

this.xPos += this.kigoWidth * 50;

if(this.xPos > width) {

this.xPos = width;

this.kigoWidth = -1;

}

if(this.xPos < 0) {

this.xPos = 0;

this.kigoWidth = 1;

}

for(var i = 0; i < this.num; i++){

var xPos = this.rad * Math.cos(2 * Math.PI * i / this.num) + width/2;

var yPos = this.rad * Math.sin(2 * Math.PI * i / this.num) + this.yPos;

// xPos, yPos

for(var jj = 0; jj < this.mainShapeArr.length; jj++){

this.mainShapeArr[jj].setCircle(xPos, yPos);

}

//

var xPos = this.rad * Math.cos(2 * Math.PI * i / this.num) + this.xPos;

var yPos = this.rad * Math.sin(2 * Math.PI * i / this.num) + height/2;

// xPos, yPos

for(var jj = 0; jj < this.mainShapeArr.length; jj++){

this.mainShapeArr[jj].setCircle(xPos, yPos);

}

}

}

};

// ================

init();

loop();

function init(){

app = new App();

timer();

}

function timer(){

app.addImpulse();

setTimeout(timer, 100);

}

function loop(){

app.update();

requestAnimationFrame(loop);

//setTimeout(loop, 1000);

}

window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;