canvas实现太空宇宙运动粒子吞噬星星动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：粒子

代码描述：canvas实现太空宇宙运动粒子吞噬星星动画效果代码

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, html{
  margin: 0;
  height: 100vh;
  background: linear-gradient(-45deg, #204, #000);
  overflow: hidden;
}
#c{
  border: 3px solid #0Ff3;
  position: absolute;
  background: #04f1;
  left: 50%;
  top: 50%;
  border-radius: 10px;
  transform: translate(-50%, -50%);
}
</style>


  
  
</head>

<body translate="no">
  <canvas id=c></canvas>
  
      <script  >
c = document.querySelector('#c');
c.width = 1920;
c.height = 1080;
x = c.getContext('2d');
C = Math.cos;
S = Math.sin;
t = 0;
T = Math.tan;

rsz = window.onresize = () => {
  let b = document.body;
  let margin = 10;
  let n;
  let d = .5625;
  if (b.clientHeight / b.clientWidth > d) {
    c.style.width = `${(n = b.clientWidth) - margin * 2}px`;
    c.style.height = `${n * d - margin * 2}px`;
  } else {
    c.style.height = `${(n = b.clientHeight) - margin * 2}px`;
    c.style.width = `${n / d - margin * 2}px`;
  }
};

rsz();

async function Draw() {
  if (!t) {
    oX = oY = oZ = 0;
    Rn = Math.random;
    R = (Rl, Pt, Yw, m) => {
      let p;
      M = Math;
      A = M.atan2;
      H = M.hypot;
      X = S(p = A(X, Z) + Yw) * (d = H(X, Z));
      Z = C(p) * d;
      X = S(p = A(X, Y) + Rl) * (d = H(X, Y));
      Y = C(p) * d;
      Y = S(p = A(Y, Z) + Pt) * (d = H(Y, Z));
      Z = C(p) * d;
      if (m) {
        X += oX;
        Y += oY;
        Z += oZ;
      }
    };

    R2 = (Rl, Pt, Yw, m = false) => {
      M = Math;
      A = M.atan2;
      H = M.hypot;
      if (m) {
        X -= oX;
        Y -= oY;
        Z -= oZ;
      }
      X = S(p = A(X, Y) + Rl) * (d = H(X, Y));
      Y = C(p) * d;
      Y = S(p = A(Y, Z) + Pt) * (d = H(Y, Z));
      Z = C(p) * d;
      X = S(p = A(X, Z) + Yw) * (d = H(X, Z));
      Z = C(p) * d;
    };

    Q = () => [c.width / 2 + X / Z * 900, c.height / 2 + Y / Z * 900];
    I = (A, B, M, D, E, F, G, H) => (K = ((G - E) * (B - F) - (H - F) * (A - E)) / (J = (H - F) * (M - A) - (G - E) * (D - B))) >= 0 && K <= 1 && (L = ((M - A) * (B - F) - (D - B) * (A - E)) / J) >= 0 && L <= 1 ? [A + K * (M - A), B + K * (D - B)] : 0;

    Normal = (facet, autoFlipNormals = false, X1 = 0, Y1 = 0, Z1 = 0) => {
      let ax = 0,ay = 0,az = 0;
      facet.map(q_ => {ax += q_[0], ay += q_[1], az += q_[2];});
      ax /= facet.length, ay /= facet.length, az /= facet.length;
      let b1 = facet[2][0] - facet[1][0],b2 = facet[2][1] - facet[1][1],b3 = facet[2][2] - facet[1][2];
      let c1 = facet[1][0] - facet[0][0],c2 = facet[1][1] - facet[0][1],c3 = facet[1][2] - facet[0][2];
      crs = [b2 * c3 - b3 * c2, b3 * c1 - b1 * c3, b1 * c2 - b2 * c1];
      d = Math.hypot(...crs) + .001;
      let nls = 1; //normal line length
      crs = crs.map(q => q / d * nls);
      let X1_ = ax,Y1_ = ay,Z1_ = az;
      let flip = 1;
      if (autoFlipNormals) {
        let d1_ = Math.hypot(X1_ - X1, Y1_ - Y1, Z1_ - Z1);
        let d2_ = Math.hypot(X1 - (ax + crs[0] / 99), Y1 - (ay + crs[1] / 99), Z1 - (az + crs[2] / 99));
        flip = d2_ > d1_ ? -1 : 1;
      }
      let X2_ = ax + (crs[0] *= flip),Y2_ = ay + (crs[1] *= flip),Z2_ = az + (crs[2] *= flip);
      return [X1_, Y1_, Z1_, X2_, Y2_, Z2_];
    };

    async function loadOBJ(url, scale, tx, ty, tz, rl, pt, yw, recenter = true) {
      let res;
      await fetch(url, res => res).then(data => data.text()).then(data => {
        a = [];
        data.split("\nv ").map(v => {
          a = [...a, v.split("\n")[0]];
        });
        a = a.filter((v, i) => i).map(v => [...v.split(' ').map(n => +n.replace("\n", ''))]);
        ax = ay = az = 0;
        a.map(v => {
          v[1] *= -1;
          if (recenter) {
            ax += v[0];
            ay += v[1];
            az += v[2];
          }
        });
        ax /= a.length;
        ay /= a.length;
        az /= a.length;
        a.map(v => {
          X = (v[0] - ax) * scale;
          Y = (v[1] - ay) * scale;
          Z = (v[2] - az) * scale;
          R2(rl, pt, yw, 0);
          v[0] = X;
          v[1] = Y * (url.indexOf('bug') != -1 ? 2 : 1);
          v[2] = Z;
        });
        maxY = -6e6;
        a.map(v => {
          if (v[1] > maxY) maxY = v[1];
        });
        a.map(v => {
          v[1] -= maxY - oY;
          v[0] += tx;
          v[1] += ty;
          v[2] += tz;
        });

        b = [];
        data.split("\nf ").map(v => {
          b = [...b, v.split("\n")[0]];
        });
        b.shift();
        b = b.map(v => v.split(' '));
        b = b.map(v => {
          v = v.map(q => {
            return +q.split('/')[0];
          });
          v = v.filter(q => q);
          return v;
        });

        res = [];
        b.map(v => {
          e = [];
          v.map(q => {
            e = [...e, a[q - 1]];
          });
          e = e.filter(q => q);
          res = [...res, e];
        });
      });
      return res;
    }

    reflect = (a, n) => {
      let d1 = Math.hypot(...a) + .0001;
      let d2 = Math.hypot(...n) + .0001;
      a[0] /= d1;
      a[1] /= d1;
      a[2] /= d1;
      n[0] /= d2;
      n[1] /= d2;
      n[2] /= d2;
      let dot = -a[0] * n[0] + -a[1] * n[1] + -a[2] * n[2];
      let rx = -a[0] - 2 * n[0] * dot;
      let ry = -a[1] - 2 * n[1] * dot;
      let rz = -a[2] - 2 * n[2] * dot;
      return [-rx * d1, -ry * d1, -rz * d1];
    };

    geoSphere = (mx, my, mz, iBc, size) => {
      let collapse = 0;
      let B = Array(iBc).fill().map(v => {
        X = Rn() - .5;
        Y = Rn() - .5;
        Z = Rn() - .5;
        return [X, Y, Z];
      });
      for (let m = 99; m--;) {
        B.map((v, i) => {
          X = v[0];
          Y = v[1];
          Z = v[2];
          B.map((q, j) => {
            if (j != i) {
              X2 = q[0];
              Y2 = q[1];
              Z2 = q[2];
              d = 1 + (Math.hypot(X - X2, Y - Y2, Z - Z2) * (3 + iBc / 40) * 3) ** 4;
              X += (X - X2) * 99 / d;
              Y += (Y - Y2) * 99 / d;
              Z += (Z - .........完整代码请登录后点击上方下载按钮下载查看