canvas三维布料漂浮空间动画效果代码-html代码-BFW代码库

代码语言：html
所属分类：动画
代码描述：canvas三维布料漂浮空间动画效果代码
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{
  background: #000;
  margin: 0;
  height: 100vh;
  overflow: hidden;
}
#c{
  background:#000;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
</style>

  
  
</head>

<body >
  <canvas id=c>
  
      <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 = () => {
  setTimeout(() => {
    if (document.body.clientWidth > document.body.clientHeight * 1.77777778) {
      c.style.height = '100vh';
      setTimeout(() => c.style.width = c.clientHeight * 1.77777778 + 'px', 0);
    } else {
      c.style.width = '100vw';
      setTimeout(() => c.style.height = c.clientWidth / 1.77777778 + 'px', 0);
    }
  }, 0);
};
rsz();

async function Draw() {
  oX = oY = oZ = 0;
  if (!t) {
    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];
    };

    HSVFromRGB = (R, G, B) => {
      let R_ = R / 256;
      let G_ = G / 256;
      let B_ = B / 256;
      let Cmin = Math.min(R_, G_, B_);
      let Cmax = Math.max(R_, G_, B_);
      let val = Cmax; //(Cmax+Cmin) / 2
      let delta = Cmax - Cmin;
      let sat = Cmax ? delta / Cmax : 0;
      let min = Math.min(R, G, B);
      let max = Math.max(R, G, B);
      let hue = 0;
      if (delta) {
        if (R >= G && R >= B) hue = (G - B) / (max - min);
        if (G >= R && G >= B) hue = 2 + (B - R) / (max - min);
        if (B >= G && B >= R) hue = 4 + (R - G) / (max - min);
      }
      hue *= 60;
      while (hue < 0) hue += 360;
      while (hue >= 360) hue -= 360;
      return [hue, sat, val];
    };

    RGBFromHSV = (H, S, V) => {
      while (H < 0) H += 360;
      while (H >= 360) H -= 360;
      let C = V * S;
      let X = C * (1 - Math.abs(H / 60 % 2 - 1));
      let m = V - C;
      let R_, G_, B_;
      if (H >= 0 && H < 60) R_ = C, G_ = X, B_ = 0;
      if (H >= 60 && H < 120) R_ = X, G_ = C, B_ = 0;
      if (H >= 120 && H < 180) R_ = 0, G_ = C, B_ = X;
      if (H >= 180 && H < 240) R_ = 0, G_ = X, B_ = C;
      if (H >= 240 && H < 300) R_ = X, G_ = 0, B_ = C;
      if (H >= 300 && H < 360) R_ = C, G_ = 0, B_ = X;
      let R = (R_ + m) * 256;
      let G = (G_ + m) * 256;
      let B = (B_ + m) * 256;
      return [R, G, B];
    };

    R = R2 = (Rl, Pt, Yw, m) => {
      M = Math;
      A = M.atan2;
      H = M.hypot;
      X = S(p = A(X, Z) + Yw) * (d = H(X, Z));
      Z = C(p) * d;
      Y = S(p = A(Y, Z) + Pt) * (d = H(Y, Z));
      Z = C(p) * d;
      X = S(p = A(X, Y) + Rl) * (d = H(X, Y));
      Y = C(p) * d;
      if (m) {
        X += oX;
        Y += oY;
        Z += oZ;
      }
    };
    Q = () => [c.width / 2 + X / Z * 700, c.height / 2 + Y / Z * 700];
    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;

    Rn = Math.random;
    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;
          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;
    }

    function loadAnimation(name, size, X, Y, Z, rl, pt, yw, speed = 1) {

      let rootURL = 'https://srmcgann.github.io/animations';
      if (typeof animations == 'undefined') animations = [];

      let animation = {
        name,
        speed,
        frameCt: 0,
        fileList: '',
        curFrame: 0,
        loopRangeStart: 0,
        loopRangeEnd: 0,
        hasLoop: false,
        looping: false,
        frameData: [],
        loaded: false,
        active: true };


      fetch(`${rootURL}/${name}/fileList.json`).then(v => v.json()).then(data => {
        animation.fileList = data.fileList;
        if (animation.fileList.hasLoop) {
          animation.hasLoop = true;
          animation.looping = true;
          animation.loopRangeStart = animation.fileList.loopRangeStart;
          animation.loopRangeEnd = animation.fileList.loopRangeEnd;
        }
        for (let i = 0; i < +animation.fileList.fileCount; i++) {
          let file = `${rootURL}/${name}/${animation.fileList.fileName}${i}.${animation.fileList.suffix}`;
          loadOBJ(file, size, X, Y, Z, rl, pt, yw, false).then(el => {
            animation.frameData[i] = el;
            animation.frameCt++;
            if (animation.frameCt == +animation.fileList.fileCount) {
              console.log(`loaded animation: ${name}`);
              animation.loaded = true;
              animations = [...animations, animation];
            }
          });
        }
      });
      return name;
    }

    drawAnimation = (animation_name, scol = '#8888', fcol = '', lineWidth = 2, glowing = true, overrideGlobalAlpha = 1) => {
      let animation = animations.filter(el => animation_name == el.name);
      if (animation.length) {
        animation = animation[0];
        animation.curFrame += animation.speed;
        if (animation.hasLoop && animation.looping) {
          animation.curFrame %= Math.min(animation.loopRangeEnd, animation.frameCt);
          if (animation.curFrame < 1) animation.curFrame = Math.max(0, animation.loopRangeStart);
        } else {
          animation.curFrame %= animation.frameCt;
        }
        animation.frameData[animation.curFrame | 0].map((v, i) => {
          x.beginPath();
          v.map(q => {
            X = q[0];
            Y = q[1];
            Z = q[2];
            R(Rl, Pt, Yw, 1);
            if (Z > 0) x.lineTo(...Q());
          });
          stroke(scol, fcol, lineWidth, glowing, overrideGlobalAlpha);
        });
      }
    };

    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 = 200; 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 - Z2) * 99 / d;
            }
          });
          d = Math.hypot(X, Y, Z);
          v[0] = X / d;
          v[1] = Y / d;
          v[2] = Z / d;
          if (collapse) {
            d = 25 + Math.hypot(X, Y, Z);
            v[0] = (X - X / d) / 1.1;
            v[1] = (Y - Y / d) / 1.1;
            v[2] = (Z - Z / d) / 1.1;
          }
        });
      }
      mind = 6e6;
      B.map((v, i) => {
        X1 = v[0];
        Y1 = v[1];
        Z1 = v[2];
        B.map((q, j) => {
          X2 = q[0];
          Y2 = q[1];
          Z2 = q[2];
          if (i != j) {
            d = Math.hypot(a = X1 - X2, b = Y1 - Y2, e = Z1 - Z2);
            if (d < mind) mind = d;
          }
        });
      });
      a = [];
      B.map((v, i) => {
        X1 = v[0];
        Y1 = v[1];
        Z1 = v[2];
        B.map((q, j) => {
          X2 = q[0];
          Y2 = q[1];
          Z2 = q[2];
          if (i != j) {
            d = Math.hypot(X1 - X2, Y1 - Y2, Z1 - Z2);
            if (d < mind * 2) {
              if (!a.filter(q => q[0] == X2 && q[1] == Y2 && q[2] == Z2 && q[3] == X1 && q[4] == Y1 && q[5] == Z1).length) a = [...a, [X1 * size, Y1 * size, Z1 * size, X2 * size, Y2 * size, Z2 * size]];
            }
          }
        });
      });
      B.map(v => {
        v[0] *= size;
        v[1] *= size;
        v[2] *= size;
        v[0] += mx;
        v[1] += my;
        v[2] += mz;
      });
      return [mx, my, mz, size, B, a];
    };

    lineFaceI = (X1, Y1, Z1, X2, Y2, Z2, facet, autoFlipNormals = false, showNormals = false) => {
      let X_, Y_, Z_, d, m, l_, K, J, L, p;
      let 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;
      let Q_ = () => [c.width / 2 + X_ / Z_ * 600, c.height / 2 + Y_ / Z_ * 600];
      let R_ = (Rl, Pt, Yw, m) => {
        let M = Math,A = M.atan2,H = M.hypot;
        X_ = S(p = A(X_, Y_) + Rl) * (d = H(X_, Y_)), Y_ = C(p) * d, X_ = S(p = A(X_, Z_) + Yw) * (d = H(X_, Z_)), Z_ = 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;}
      };
      let rotSwitch = m => {
        switch (m) {
          case 0:R_(0, 0, Math.PI / 2);break;
          case 1:R_(0, Math.PI / 2, 0);break;
          case 2:R_(Math.PI / 2, 0, Math.PI / 2);break;}

      };
      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];
      let 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);
      if (showNormals) {
        x.beginPath();
        X_ = X1_, Y_ = Y1_, Z_ = Z1_;
        R_(Rl, Pt, Yw, 1);
        if (Z_ > 0) x.lineTo(...Q_());
        X_ = X2_, Y_ = Y2_, Z_ = Z2_;
        R_(Rl, Pt, Yw, 1);
        if (Z_ > 0) x.lineTo(...Q_());
        x.lineWidth = 5;
        x.strokeStyle = '#f004';
        x.stroke();
      }

      let p1_ = Math.atan2(X2_ - X1_, Z2_ - Z1_);
      let p2_ = -(Math.acos((Y2_ - Y1_) / (Math.hypot(X2_ - X1_, Y2_ - Y1_, Z2_ - Z1_) + .001)) + Math.PI / 2);
      let isc = false,iscs = [false, false, false];
      X_ = X1, Y_ = Y1, Z_ = Z1;
      R_(0, -p2_, -p1_);
      let rx_ = X_,ry_ = Y_,rz_ = Z_;
      for (let m = 3; m--;) {
        if (isc === false) {
          X_ = rx_, Y_ = ry_, Z_ = rz_;
          rotSwitch(m);
          X1_ = X_, Y1_ = Y_, Z1_ = Z_ = 5, X_ = X2, Y_ = Y2, Z_ = Z2;
          R_(0, -p2_, -p1_);
          rotSwitch(m);
          X2_ = X_, Y2_ = Y_, Z2_ = Z_;
          facet.map((q_, j_) => {
            if (isc === false) {
              let l = j_;
              X_ = facet[l][0], Y_ = facet[l][1], Z_ = facet[l][2];
              R_(0, -p2_, -p1_);
              rotSwitch(m);
              let X3_ = X_,Y3_ = Y_,Z3_ = Z_;
              l = (j_ + 1) % facet.length;
              X_ = facet[l][0], Y_ = facet[l][1], Z_ = facet[l][2];
              R_(0, -p2_, -p1_);
              rotSwitch(m);
              let X4_ = X_,Y4_ = Y_,Z4_ = Z_;
              if (l_ = I_(X1_, Y1_, X2_, Y2_, X3_, Y3_, X4_, Y4_)) iscs[m] = l_;
            }
          });
        }
      }
      if (iscs.filter(v => v !== false).len.........完整代码请登录后点击上方下载按钮下载查看