这又是一款基于HTML5 Canvas的3D动画杰作,它是一个可以随风飘动的3D衣服摇摆动画特效,非常逼真。当我们将鼠标滑过衣服时,衣服将会出现摇摆的动画,点击鼠标时,衣服将会更加剧烈地摆动。
在线演示 源码下载
HTML代码
XML/HTML Code复制内容到剪贴板
- div style="width:500px;margin:10px auto">
-
canvas id="cv" width="480" height="300">canvas>
-
p>"3D on 2D Canvas" demop>
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p>move cursor to pan / click to swingp>
-
div>
P3D库JS代码,主要用来处理3D效果的
JavaScript Code复制内容到剪贴板
- window.P3D = {
-
texture: null,
-
g: null
- };
-
-
P3D.clear = function(f, w, h) {
-
var g = this.g;
- g.beginPath();
- g.fillStyle = f;
- g.fillRect(0, 0, w, h);
-
- }
-
-
P3D.num_cmp = function(a,b){return a-b;}
-
-
P3D.drawTriangle = function(poss, uvs, shade_clr) {
-
var w = this.texture.width;
-
var h = this.texture.height;
-
-
var g = this.g;
-
-
var vAd = [ poss[1].x - poss[0].x , poss[1].y - poss[0].y ];
-
var vBd = [ poss[2].x - poss[0].x , poss[2].y - poss[0].y ];
-
-
var vA = [ uvs[1].u - uvs[0].u , uvs[1].v - uvs[0].v ];
-
var vB = [ uvs[2].u - uvs[0].u , uvs[2].v - uvs[0].v ];
-
- vA[0] *= w;
- vA[1] *= h;
-
- vB[0] *= w;
- vB[1] *= h;
-
-
var m = new M22();
- m._11 = vA[0];
- m._12 = vA[1];
- m._21 = vB[0];
- m._22 = vB[1];
-
-
var im = m.getInvert();
-
if (!im) return false;
-
-
var a = im._11 * vAd[0] + im._12 * vBd[0];
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var b = im._21 * vAd[0] + im._22 * vBd[0];
-
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var c = im._11 * vAd[1] + im._12 * vBd[1];
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var d = im._21 * vAd[1] + im._22 * vBd[1];
-
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var wu = uvs[0].u * w;
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var hv = uvs[0].v * h;
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var du = wu * a + hv * b;
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var dv = wu * c + hv * d;
-
- g.save();
-
- g.beginPath();
- g.moveTo(poss[0].x, poss[0].y);
- g.lineTo(poss[1].x, poss[1].y);
- g.lineTo(poss[2].x, poss[2].y);
- g.clip();
-
- g.transform(a, c, b, d, poss[0].x - du, poss[0].y - dv);
-
-
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var bx = [wu, wu+vA[0], wu+vB[0]];
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var by = [hv, hv+vA[1], hv+vB[1]];
-
- bx.sort(P3D.num_cmp);
- by.sort(P3D.num_cmp);
-
-
var bw = bx[2] - bx[0];
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var bh = by[2] - by[0];
-
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if ((bx[0]+bw)
-
if ((by[0]+bh)
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if (bx[0] >= 1) {bx[0]--; bw++;}
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if (by[0] >= 1) {by[0]--; bh++;}
-
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g.drawImage(this.texture, bx[0], by[0], bw, bh, bx[0], by[0], bw, bh);
-
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if (shade_clr) {
- g.fillStyle = shade_clr;
- g.fillRect(bx[0], by[0], bw, bh);
- }
-
- g.restore();
-
-
return true;
- }
-
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P3D.drawTestByIndexBuffer = function(pos_buf, ix_buf, culling) {
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var g = this.g;
-
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if ((ix_buf.length%3) != 0)
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throw "invalid index buffer length!";
-
-
var len = ix_buf.length/3;
-
-
var i, ibase, vbase;
-
var poss = [{},{},{}];
- g.strokeWidth = 1;
-
for (i = 0, ibase = 0;i
- {
- vbase = ix_buf[ibase++]
- poss[0].x = pos_buf[vbase++];
- poss[0].y = pos_buf[vbase ];
-
- vbase = ix_buf[ibase++]
- poss[1].x = pos_buf[vbase++];
- poss[1].y = pos_buf[vbase ];
-
- vbase = ix_buf[ibase++]
- poss[2].x = pos_buf[vbase++];
- poss[2].y = pos_buf[vbase ];
-
-
-
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var Ax = poss[1].x - poss[0].x;
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var Ay = poss[1].y - poss[0].y;
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var Cx = poss[2].x - poss[1].x;
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var Cy = poss[2].y - poss[1].y;
-
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var cull = ( (((Ax * Cy) - (Ay * Cx))*culling)
-
- g.beginPath();
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g.strokeStyle = cull ? "#592" : "#0f0";
- g.moveTo(poss[0].x, poss[0].y);
- g.lineTo(poss[1].x, poss[1].y);
- g.lineTo(poss[2].x, poss[2].y);
- g.lineTo(poss[0].x, poss[0].y);
- g.stroke();
- }
- }
-
-
P3D.drawByIndexBuffer = function(pos_buf, ix_buf, tx_buf, culling, z_clip) {
-
var w, h;
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var color_polygon = !this.texture;
-
if (this.texture) {
-
w = this.texture.width;
-
h = this.texture.height;
- }
-
-
var g = this.g;
-
var m = new M22();
-
-
if (!culling) culling = 0;
-
-
if ((ix_buf.length%3) != 0)
-
throw "invalid index buffer length!";
-
-
var i, ibase, vbase, tbase, poss = [{},{},{}];
-
var len = ix_buf.length/3;
-
var uv_0u, uv_0v, uv_1u, uv_1v, uv_2u, uv_2v;
-
-
for (i = 0, ibase = 0;i
- {
- tbase = ix_buf[ibase++]
- vbase = tbase
- poss[0].x = pos_buf[vbase++]; uv_0u = tx_buf[tbase++];
- poss[0].y = pos_buf[vbase++]; uv_0v = tx_buf[tbase];
-
if (z_clip && (pos_buf[vbase] 1)) {ibase += 2; continue;}
-
- tbase = ix_buf[ibase++]
- vbase = tbase
- poss[1].x = pos_buf[vbase++]; uv_1u = tx_buf[tbase++];
- poss[1].y = pos_buf[vbase++]; uv_1v = tx_buf[tbase];
-
if (z_clip && (pos_buf[vbase] 1)) {++ibase; continue;}
-
- tbase = ix_buf[ibase++]
- vbase = tbase
- poss[2].x = pos_buf[vbase++]; uv_2u = tx_buf[tbase++];
- poss[2].y = pos_buf[vbase++]; uv_2v = tx_buf[tbase];
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if (z_clip && (pos_buf[vbase] 1)) {continue;}
-
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var vAd = [ poss[1].x - poss[0].x , poss[1].y - poss[0].y ];
-
var vBd = [ poss[2].x - poss[0].x , poss[2].y - poss[0].y ];
-
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var vCd = [ poss[2].x - poss[1].x , poss[2].y - poss[1].y ];
-
-
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if( (((vAd[0] * vCd[1]) - (vAd[1] * vCd[0]))*culling)
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continue;
-
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if (color_polygon) {
- g.fillStyle = uv_0u;
-
- g.beginPath();
- g.moveTo(poss[0].x, poss[0].y);
- g.lineTo(poss[1].x, poss[1].y);
- g.lineTo(poss[2].x, poss[2].y);
- g.fill();
-
continue;
- }
-
-
var vA = [ uv_1u - uv_0u , uv_1v - uv_0v ];
-
var vB = [ uv_2u - uv_0u , uv_2v - uv_0v ];
-
- vA[0] *= w;
- vA[1] *= h;
-
- vB[0] *= w;
- vB[1] *= h;
-
- m._11 = vA[0];
- m._12 = vA[1];
- m._21 = vB[0];
- m._22 = vB[1];
-
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var im = m.getInvert();
-
if (!im) { continue;}
-
-
var a = im._11 * vAd[0] + im._12 * vBd[0];
-
var b = im._21 * vAd[0] + im._22 * vBd[0];
-
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var c = im._11 * vAd[1] + im._12 * vBd[1];
-
var d = im._21 * vAd[1] + im._22 * vBd[1];
-
-
var wu = uv_0u * w;
-
var hv = uv_0v * h;
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var du = wu * a + hv * b;
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var dv = wu * c + hv * d;
-
- g.save();
-
- g.beginPath();
- g.moveTo(poss[0].x, poss[0].y);
- g.lineTo(poss[1].x, poss[1].y);
- g.lineTo(poss[2].x, poss[2].y);
- g.clip();
- g.transform(a, c, b, d, poss[0].x - du, poss[0].y - dv);
-
-
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var bx = [wu, wu+vA[0], wu+vB[0]];
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var by = [hv, hv+vA[1], hv+vB[1]];
-
- bx.sort(P3D.num_cmp);
- by.sort(P3D.num_cmp);
-
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var bw = bx[2] - bx[0];
-
var bh = by[2] - by[0];
-
-
if ((bx[0]+bw)
-
if ((by[0]+bh)
-
if (bx[0] >= 1) {bx[0]--; bw++;}
-
if (by[0] >= 1) {by[0]--; bh++;}
-
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g.drawImage(this.texture, bx[0], by[0], bw, bh, bx[0], by[0], bw, bh);
-
-
-
-
-
-
- g.restore();
-
- }
-
- }
-
-
function Vec3(_x, _y, _z)
- {
-
this.x = _x || 0;
-
this.y = _y || 0;
-
this.z = _z || 0;
- }
-
- Vec3.prototype = {
-
zero: function() {
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this.x = this.y = this.z = 0;
- },
-
-
sub: function(v) {
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this.x -= v.x;
-
this.y -= v.y;
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this.z -= v.z;
-
-
return this;
- },
-
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add: function(v) {
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this.x += v.x;
-
this.y += v.y;
-
this.z += v.z;
-
-
return this;
- },
-
-
copyFrom: function(v) {
-
this.x = v.x;
-
this.y = v.y;
-
this.z = v.z;
-
-
return this;
- },
-
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norm:function() {
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return Math.sqrt(this.x*this.x + this.y*this.y + this.z*this.z);
- },
-
-
normalize: function() {
-
var nrm = Math.sqrt(this.x*this.x + this.y*this.y + this.z*this.z);
-
if (nrm != 0)
- {
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this.x /= nrm;
-
this.y /= nrm;
-
this.z /= nrm;
- }
-
return this;
- },
-
-
smul: function(k) {
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this.x *= k;
-
this.y *= k;
-
this.z *= k;
-
-
return this;
- },
-
-
dpWith: function(v) {
-
return this.x*v.x + this.y*v.y + this.z*v.z;
- },
-
-
cp: function(v, w) {
-
this.x = (w.y * v.z) - (w.z * v.y);
-
this.y = (w.z * v.x) - (w.x * v.z);
-
this.z = (w.x * v.y) - (w.y * v.x);
-
-
return this;
- },
-
-
toString: function() {
-
return this.x + ", " + this.y + "," + this.z;
- }
- }
-
-
function M44(cpy)
- {
-
if (cpy)
-
this.copyFrom(cpy);
-
else {
-
this.ident();
- }
- }
-
- M44.prototype = {
-
ident: function() {
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this._12 = this._13 = this._14 = 0;
-
this._21 = this._23 = this._24 = 0;
-
this._31 = this._32 = this._34 = 0;
-
this._41 = this._42 = this._43 = 0;
-
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this._11 = this._22 = this._33 = this._44 = 1;
-
-
return this;
- },
-
-
copyFrom: function(m) {
-
this._11 = m._11;
-
this._12 = m._12;
-
this._13 = m._13;
-
this._14 = m._14;
-
-
this._21 = m._21;
-
this._22 = m._22;
-
this._23 = m._23;
-
this._24 = m._24;
-
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this._31 = m._31;
-
this._32 = m._32;
-
this._33 = m._33;
-
this._34 = m._34;
-
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this._41 = m._41;
-
this._42 = m._42;
-
this._43 = m._43;
-
this._44 = m._44;
-
-
return this;
- },
-
-
transVec3: function(out, x, y, z) {
-
out[0] = x * this._11 + y * this._21 + z * this._31 + this._41;
-
out[1] = x * this._12 + y * this._22 + z * this._32 + this._42;
-
out[2] = x * this._13 + y * this._23 + z * this._33 + this._43;
-
out[3] = x * this._14 + y * this._24 + z * this._34 + this._44;
- },
-
-
transVec3Rot: function(out, x, y, z) {
-
out[0] = x * this._11 + y * this._21 + z * this._31;
-
out[1] = x * this._12 + y * this._22 + z * this._32;
-
out[2] = x * this._13 + y * this._23 + z * this._33;
- },
-
-
perspectiveLH: function(vw, vh, z_near, z_far) {
-
this._11 = 2.0*z_near/vw;
-
this._12 = 0;
-
this._13 = 0;
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this._14 = 0;
-
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this._21 = 0;
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this._22 = 2*z_near/vh;
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this._23 = 0;
-
this._24 = 0;
-
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this._31 = 0;
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this._32 = 0;
-
this._33 = z_far/(z_far-z_near);
-
this._34 = 1;
-
-
this._41 = 0;
-
this._42 = 0;
-
this._43 = z_near*z_far/(z_near-z_far);
-
this._44 = 0;
-
-
return this;
- },
-
-
lookAtLH: function(aUp, aFrom, aAt) {
-
var aX = new Vec3();
-
var aY = new Vec3();
-
-
var aZ = new Vec3(aAt.x, aAt.y, aAt.z);
- aZ.sub(aFrom).normalize();
-
- aX.cp(aUp, aZ).normalize();
- aY.cp(aZ, aX);
-
-
this._11 = aX.x; this._12 = aY.x; this._13 = aZ.x; this._14 = 0;
-
this._21 = aX.y; this._22 = aY.y; this._23 = aZ.y; this._24 = 0;
-
this._31 = aX.z; this._32 = aY.z; this._33 = aZ.z; this._34 = 0;
-
-
this._41 = -aFrom.dpWith(aX);
-
this._42 = -aFrom.dpWith(aY);
-
this._43 = -aFrom.dpWith(aZ);
-
this._44 = 1;
-
-
return this;
- },
-
-
mul: function(A, B) {
-
this._11 = A._11*B._11 + A._12*B._21 + A._13*B._31 + A._14*B._41;
-
this._12 = A._11*B._12 + A._12*B._22 + A._13*B._32 + A._14*B._42;
-
this._13 = A._11*B._13 + A._12*B._23 + A._13*B._33 + A._14*B._43;
-
this._14 = A._11*B._14 + A._12*B._24 + A._13*B._34 + A._14*B._44;
-
-
this._21 = A._21*B._11 + A._22*B._21 + A._23*B._31 + A._24*B._41;
-
this._22 = A._21*B._12 + A._22*B._22 + A._23*B._32 + A._24*B._42;
-
this._23 = A._21*B._13 + A._22*B._23 + A._23*B._33 + A._24*B._43;
-
this._24 = A._21*B._14 + A._22*B._24 + A._23*B._34 + A._24*B._44;
-
-
this._31 = A._31*B._11 + A._32*B._21 + A._33*B._31 + A._34*B._41;
-
this._32 = A._31*B._12 + A._32*B._22 + A._33*B._32 + A._34*B._42;
-
this._33 = A._31*B._13 + A._32*B._23 + A._33*B._33 + A._34*B._43;
-
this._34 = A._31*B._14 + A._32*B._24 + A._33*B._34 + A._34*B._44;
-
-
this._41 = A._41*B._11 + A._42*B._21 + A._43*B._31 + A._44*B._41;
-
this._42 = A._41*B._12 + A._42*B._22 + A._43*B._32 + A._44*B._42;
-
this._43 = A._41*B._13 + A._42*B._23 + A._43*B._33 + A._44*B._43;
-
this._44 = A._41*B._14 + A._42*B._24 + A._43*B._34 + A._44*B._44;
-
-
return this;
- },
-
-
translate: function(x, y, z) {
-
this._11 = 1; this._12 = 0; this._13 = 0; this._14 = 0;
-
this._21 = 0; this._22 = 1; this._23 = 0; this._24 = 0;
-
this._31 = 0; this._32 = 0; this._33 = 1; this._34 = 0;
-
-
this._41 = x; this._42 = y; this._43 = z; this._44 = 1;
-
return this;
- },
-
-
transpose33: function() {
-
var t;
-
-
t = this._12;
-
this._12 = this._21;
-
this._21 = t;
-
-
t = this._13;
-
this._13 = this._31;
-
this._31 = t;
-
-
t = this._23;
-
this._23 = this._32;
-
this._32 = t;
-
-
return this;
- },
-
-
-
glRotate: function(angle, x, y, z) {
-
var s = Math.sin( angle );
-
var c = Math.cos( angle );
-
-
var xx = x * x;
-
var yy = y * y;
-
var zz = z * z;
-
var xy = x * y;
-
var yz = y * z;
-
var zx = z * x;
-
var xs = x * s;
-
var ys = y * s;
-
var zs = z * s;
-
var one_c = 1.0 - c;
-
-
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-
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-
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