329 Codepen

Много летающих кубов на канвасе

Летающие разноцветные кубы на канвасе

HTML

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

CSS

html,body{
    margin:0px;
    width:100%;
    height:100vh;
    overflow:hidden;
  background:#000''
}

#canvas{
    width:100%;
    height:100%;
}

JS

function project3D(x,y,z,vars){

    var p,d;
    x-=vars.camX;
    y-=vars.camY;
    z-=vars.camZ;
    p=Math.atan2(x,z);
    d=Math.sqrt(x*x+z*z);
    x=Math.sin(p-vars.yaw)*d;
    z=Math.cos(p-vars.yaw)*d;
    p=Math.atan2(y,z);
    d=Math.sqrt(y*y+z*z);
    y=Math.sin(p-vars.pitch)*d;
    z=Math.cos(p-vars.pitch)*d;
    p=Math.atan2(x,y);
    d=Math.sqrt(x*x+y*y);
    x=Math.sin(p-vars.roll)*d;
    y=Math.cos(p-vars.roll)*d;
    return {x:vars.cx+x/z*vars.scale,y:vars.cy+y/z*vars.scale,d:z>0?Math.sqrt(x*x+y*y+z*z):-1}
}

function rgb(col){

    col += 0.000001;
    var r = parseInt((0.5+Math.sin(col)*0.5)*16);
    var g = parseInt((0.5+Math.cos(col)*0.5)*16);
    var b = parseInt((0.5-Math.sin(col)*0.5)*16);
    return "#"+r.toString(16)+g.toString(16)+b.toString(16);
}

function process(vars){

    vars.scale-=Math.cos(vars.frameNo/40)*8;
    vars.shipSpeed+=Math.cos(vars.frameNo/40)/30;
    vars.yaw+=Math.cos(vars.frameNo/100)/80;
    vars.pitch+=Math.sin(vars.frameNo/70)/40;
    vars.roll-=Math.cos(vars.frameNo/130)/40;
    vars.shipVX=Math.sin(vars.yaw)*Math.cos(vars.pitch)*vars.shipSpeed;
    vars.shipVZ=Math.cos(vars.yaw)*Math.cos(vars.pitch)*vars.shipSpeed;
    vars.shipVY=Math.sin(vars.pitch)*vars.shipSpeed;
    vars.camX+=vars.shipVX;
    vars.camY+=vars.shipVY;
    vars.camZ+=vars.shipVZ;

    for(var i=0;i<vars.shapes.length;++i){
        rotateShape(vars.shapes[i],i/vars.shapes.length*.1,-i/vars.shapes.length*.1,i/vars.shapes.length*.1);
        if(vars.shapes[i].x-vars.camX>vars.fieldRadius)vars.shapes[i].x-=vars.fieldRadius*2;
        if(vars.shapes[i].x-vars.camX<-vars.fieldRadius)vars.shapes[i].x+=vars.fieldRadius*2;
        if(vars.shapes[i].y-vars.camY>vars.fieldRadius)vars.shapes[i].y-=vars.fieldRadius*2;
        if(vars.shapes[i].y-vars.camY<-vars.fieldRadius)vars.shapes[i].y+=vars.fieldRadius*2;
        if(vars.shapes[i].z-vars.camZ>vars.fieldRadius)vars.shapes[i].z-=vars.fieldRadius*2;
        if(vars.shapes[i].z-vars.camZ<-vars.fieldRadius)vars.shapes[i].z+=vars.fieldRadius*2;
    }
}

function sortFunction(a,b){
    return b.dist-a.dist;
}

function draw(vars){

    vars.ctx.globalAlpha=1;
    vars.ctx.fillStyle="rgba(0,0,0,.65)";
    vars.ctx.fillRect(0, 0, canvas.width, canvas.height);
    var x,y,z,point,pta,ptb,a;
    
    for(i=vars.shapes.length;i--;){
        x=vars.shapes[i].x;
        y=vars.shapes[i].y;
        z=vars.shapes[i].z;
        point=project3D(x,y,z,vars);
        a=1-Math.pow(point.d/vars.fieldRadius,10);
        vars.ctx.globalAlpha=a<0?0:a;
        vars.ctx.strokeStyle=rgb(vars.frameNo/16+(i/800)*(1/vars.scale*200));
        vars.ctx.lineWidth=40/(1+point.d);
        vars.ctx.beginPath();
        for(j=12;j--;){
            pta=project3D(x+vars.shapes[i].s[j].a.x,y+vars.shapes[i].s[j].a.y,z+vars.shapes[i].s[j].a.z,vars);
            ptb=project3D(x+vars.shapes[i].s[j].b.x,y+vars.shapes[i].s[j].b.y,z+vars.shapes[i].s[j].b.z,vars);
            if(pta.d!=-1&&ptb.d!=-1){
                vars.ctx.moveTo(pta.x,pta.y);
                vars.ctx.lineTo(ptb.x,ptb.y);
            }
        }
        vars.ctx.stroke();
    }
}

function rotateShape(shape, yaw, pitch, roll){
    var x,y,z,p,d;
    for(var i=0;i<shape.s.length;++i){
        for(var j=2;j--;){
            if(j){
                x=shape.s[i].a.x;
                y=shape.s[i].a.y;
                z=shape.s[i].a.z;
            }else{
                x=shape.s[i].b.x;
                y=shape.s[i].b.y;
                z=shape.s[i].b.z;
            }
            d=Math.sqrt(x*x+z*z);
            p=Math.atan2(x,z);
            x=Math.sin(p+yaw)*d;
            z=Math.cos(p+yaw)*d;
            d=Math.sqrt(y*y+z*z);
            p=Math.atan2(y,z);
            y=Math.sin(p+pitch)*d;
            z=Math.cos(p+pitch)*d;
            d=Math.sqrt(x*x+y*y);
            p=Math.atan2(x,y);
            x=Math.sin(p+roll)*d;
            y=Math.cos(p+roll)*d;
            if(j){
                shape.s[i].a.x=x;
                shape.s[i].a.y=y;
                shape.s[i].a.z=z;
            }else{
                shape.s[i].b.x=x;
                shape.s[i].b.y=y;
                shape.s[i].b.z=z;
            }
        }
    }
}

function S(x1,y1,z1,x2,y2,z2){
    this.a={x:x1,y:y1,z:z1};
    this.b={x:x2,y:y2,z:z2};
}

function Cube(x,y,z){

    Q={};
    Q.x=x;
    Q.y=y;
    Q.z=z;
    Q.s=[];
    Q.s.push(new S(-1,-1,-1,1,-1,-1));
    Q.s.push(new S(1,-1,-1,1,1,-1));
    Q.s.push(new S(1,1,-1,-1,1,-1));
    Q.s.push(new S(-1,1,-1,-1,-1,-1));
    Q.s.push(new S(-1,-1,1,1,-1,1));
    Q.s.push(new S(1,-1,1,1,1,1));
    Q.s.push(new S(1,1,1,-1,1,1));
    Q.s.push(new S(-1,1,1,-1,-1,1));
    Q.s.push(new S(-1,-1,-1,-1,-1,1));
    Q.s.push(new S(1,-1,-1,1,-1,1));
    Q.s.push(new S(1,1,-1,1,1,1));
    Q.s.push(new S(-1,1,-1,-1,1,1));
    return Q;
}

R=()=>Math.random()*Math.PI*2;

function loadScene(vars){
    
    vars.shapes=[];
    for(var i=0;i<vars.cubeNo;++i){
        var x=vars.fieldRadius-Math.random()*vars.fieldRadius*2;
        var y=vars.fieldRadius-Math.random()*vars.fieldRadius*2;
        var z=vars.fieldRadius-Math.random()*vars.fieldRadius*2;
        var c=new Cube(x,y,z);
        rotateShape(c,R(),R(),R());
        vars.shapes.push(c);
    }
}

function frame(vars) {

    if(vars === undefined){
        var vars={};
        vars.canvas = document.querySelector("canvas");
        vars.ctx = vars.canvas.getContext("2d");
        vars.canvas.width = document.body.clientWidth;
        vars.canvas.height = document.body.clientHeight;
        window.addEventListener("resize", function(){
            vars.canvas.width = document.body.clientWidth;
            vars.canvas.height = document.body.clientHeight;
            vars.cx=vars.canvas.width/2;
            vars.cy=vars.canvas.height/2;
        }, true);
        vars.frameNo=0;
        vars.canvas.addEventListener("mousemove",(e)=>{
            vars.mx=e.clientX/vars.canvas.clientWidth*vars.canvas.width
            vars.my=e.clientY/vars.canvas.clientHeight*vars.canvas.height
        });
        vars.camX = 0;
        vars.camY = 0;
        vars.camZ = 0;
        vars.pitch = 0;
        vars.yaw = 0;
        vars.roll = 0;
        vars.cx=vars.canvas.width/2;
        vars.cy=vars.canvas.height/2;
        vars.scale=400;

        vars.shipSpeed=1.5;
        vars.shipVX=vars.shipVY=vars.shipVZ=0;
        vars.fieldRadius=150;
        vars.cubeNo=1500;
        loadScene(vars);
    }

    vars.frameNo++;
    requestAnimationFrame(function() {
        frame(vars);
    });

    process(vars);
    draw(vars);
}
frame();

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