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POCanvas Script Not Working
 

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  1. POCanvas Script Not Working
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    <p>I'm using this script on Wordpress and it works fine. However, I've decided to switch to Blogger instead. Now when I include it in the Blogger template, it doesn't work and I get this error in the Chrome console:</p> <blockquote> <p>Uncaught SyntaxError: Unexpected token &lt;</p> </blockquote> <p>Here is the script:</p> <pre><code>&lt;script&gt; &lt;![CDATA[ !+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+!+-+-+! function(d, w){ var FPS = 30;//FPS var F = 300;//焦点距離 var N = 3;//軌跡の本数 var VERTEX_MAX = 10;//軌跡の長さ var TRAIL_QUALITY = 4000;//軌跡のクオリティ var mu = 0.5;//前のアンカーポイントへの依存具合 var bmRandom = function(mu, sigma){ var x, y, r, tmp=null, tmp2; return function(){ if(tmp !== null){ tmp2 = tmp; tmp = null; return y*tmp2+mu; } do{ x = Math.random()*2-1; y = Math.random()*2-1; r = x*x+y*y; }while(r&gt;=1); tmp = sigma*Math.sqrt(-2*Math.log(r)/r); return x*tmp+mu; }; }; pointCopy = function(src, dst){ dst.x = src.x; dst.y = src.y; dst.z = src.z; return dst; }; Trail = function(pos, t, color_f){ this.pos={x:0,y:0,z:0}; this.start={x:0,y:0,z:0}; this.goal={x:0,y:0,z:0}; this.anchor_1={x:0,y:0,z:0}; this.anchor_2={x:0,y:0,z:0}; this.start_time = 0; this.take_time = 1; this.vertexes = []; this.anchors_1 = []; this.anchors_2 = []; this.color_f = color_f; pointCopy(pos, this.pos); pointCopy(pos, this.start); pointCopy(pos, this.goal); this.setNextGoal(t); }; Trail.prototype.setNextGoal = function(t, target){ pointCopy(this.goal, this.start); this.anchor_1.x = this.start.x+(this.start.x-this.anchor_2.x)*mu; this.anchor_1.y = this.start.y+(this.start.y-this.anchor_2.y)*mu; this.anchor_1.z = this.start.z+(this.start.z-this.anchor_2.z)*mu; if(target){ this.anchor_2.x = (this.anchor_1.x+target.x)/2+myrand(); this.anchor_2.y = (this.anchor_1.y+target.y)/2+myrand(); this.anchor_2.z = (this.anchor_1.z+target.z)/2+myrand(); this.goal.x = target.x; this.goal.y = target.y; this.goal.z = target.z; }else{ this.anchor_2.x = this.anchor_1.x+myrand(); this.anchor_2.y = this.anchor_1.y+myrand(); this.anchor_2.z = this.anchor_1.z+myrand(); this.goal.x = this.anchor_2.x+myrand(); this.goal.y = this.anchor_2.y+myrand(); this.goal.z = this.anchor_2.z+myrand(); } this.start_time = t; this.take_time = 200+Math.random()*200; this.vertexes.push(pointCopy(this.start, {x:0,y:0,z:0})); this.anchors_1.push(pointCopy(this.anchor_1, {x:0,y:0,z:0})); this.anchors_2.push(pointCopy(this.anchor_2, {x:0,y:0,z:0})); if(this.vertexes.length &gt; VERTEX_MAX){ this.vertexes.splice(0,this.vertexes.length-VERTEX_MAX); this.anchors_1.splice(0,this.anchors_1.length-VERTEX_MAX); this.anchors_2.splice(0,this.anchors_2.length-VERTEX_MAX); } }; Trail.prototype.update = function(t, target){ bezier3( t-this.start_time, this.start, this.anchor_1, this.anchor_2, this.goal, this.take_time, this.pos ); if(t-this.start_time &gt; this.take_time){ this.setNextGoal(this.start_time+this.take_time, target); this.update(t, target); } }; Trail.prototype.draw = function(ctx, camera, t){ var i, dz, dt, ddt, rt, a, v={x:0, y:0, z:0}; var ps = {x:0, y:0}; ctx.beginPath(); if(perspective(this.vertexes[0], camera, ps)){ ctx.moveTo(ps.x, ps.y); } var x0 = ps.x; rt = (t-this.start_time)/this.take_time; for(i=1; i&lt;this.vertexes.length; i++){ ddt = 0.01; for(dt=0; dt&lt;1; dt+=ddt){ bezier3(dt, this.vertexes[i-1], this.anchors_1[i-1], this.anchors_2[i-1], this.vertexes[i], 1, v); if(perspective(v, camera, ps)){ dz = v.z-camera.z; a = 1-(this.vertexes.length-i+1-dt+rt)/VERTEX_MAX; this.color_f(ctx, a, dz); ctx.lineTo(ps.x, ps.y); ctx.stroke(); ctx.beginPath(); ctx.moveTo(ps.x, ps.y); ddt = dz/TRAIL_QUALITY+0.01; } } } ddt = 0.01; for(dt=0; dt&lt;rt; dt+=ddt){ bezier3(dt, this.start, this.anchor_1, this.anchor_2, this.goal, 1, v); if(perspective(v, camera, ps)){ dz = v.z-camera.z; a = 1-(1-dt+rt)/VERTEX_MAX; this.color_f(ctx, a, dz); ctx.lineTo(ps.x, ps.y); ctx.stroke(); ctx.beginPath(); ctx.moveTo(ps.x, ps.y); ddt = dz/TRAIL_QUALITY+0.01; } } if(perspective(this.pos, camera, ps)){ dz = this.pos.z-camera.z; a = 1-1/VERTEX_MAX; this.color_f(ctx, a, dz); ctx.lineTo(ps.x, ps.y); ctx.stroke(); } }; bezier3 = function(t, a, b, c, d, e, dst){ t /= e; dst.x = a.x*(1-t)*(1-t)*(1-t)+ b.x*3*t*(1-t)*(1-t)+ c.x*3*t*t*(1-t)+ d.x*t*t*t; dst.y = a.y*(1-t)*(1-t)*(1-t)+ b.y*3*t*(1-t)*(1-t)+ c.y*3*t*t*(1-t)+ d.y*t*t*t; dst.z = a.z*(1-t)*(1-t)*(1-t)+ b.z*3*t*(1-t)*(1-t)+ c.z*3*t*t*(1-t)+ d.z*t*t*t; }; perspective = function(point, camera, dst){ var dx = point.x-camera.x; var dy = point.y-camera.y; var dz = point.z-camera.z; if(dz &gt; 0){ dst.x = F*dx/dz; dst.y = F*dy/dz; return true; } return false; }; updateScene = function(ctx){ var i, goal; time_now = new Date().getTime(); var time_d = time_now-time_pre; trails[0].update(time_now); for(i=1; i&lt;trails.length; i++){ trails[i].update(time_now, trails[i-1].pos); } camera.x += (trails[0].pos.x-camera.x)*0.0005*time_d; camera.y += (trails[0].pos.y-camera.y)*0.0005*time_d; camera.z += (trails[0].pos.z-camera.z-100)*0.0005*time_d; time_pre = time_now; }; drawScene = function(ctx){ var i; ctx.clearRect(-canvas.width/2, -canvas.height/2, canvas.width, canvas.height); for(i=0; i&lt;trails.length; i++){ trails[i].draw(ctx, camera, time_now); } }; var myrand = bmRandom(0,20); var canvas = d.getElementById("canvas-header"); var ctx = canvas.getContext("2d"); var trails = []; var i; var time_now = new Date().getTime(); var time_pre = time_now; var camera = {x:0, y:0, z:-200}; for(i=0; i&lt;N; i++){ trails.push(new Trail({x:myrand(), y:myrand(), z:myrand()}, time_now, function(a,z){return "#FFFFFF";})); } for(i=0; i&lt;N; i++){ switch(i%3){ case 0: trails[i].color_f=function(ctx, a, dz){ var b = dz&lt;10?0:a*F/dz; b = (b&gt;1?1:b)*(dz&lt;30?(dz-10)/20:1); ctx.strokeStyle = "rgba(255,"+Math.floor(255*a)+",0,"+b+")"; ctx.lineWidth = F/dz; ctx.lineCap = b&gt;0.8?"round":"butt"; }; break; case 1: trails[i].color_f=function(ctx, a, dz){ var b = dz&lt;10?0:a*F/dz; b = (b&gt;1?1:b)*(dz&lt;30?(dz-10)/20:1); ctx.strokeStyle = "rgba(0, 255,"+Math.floor(255*a)+","+b+")"; ctx.lineWidth = F/dz; ctx.lineCap = b&gt;0.8?"round":"butt"; }; break; default: trails[i].color_f=function(ctx, a, dz){ var b = dz&lt;10?0:a*F/dz; b = (b&gt;1?1:b)*(dz&lt;30?(dz-10)/20:1); ctx.strokeStyle = "rgba("+Math.floor(255*a)+",0,255,"+b+")"; ctx.lineWidth = F/dz; ctx.lineCap = b&gt;0.8?"round":"butt"; }; break; } } canvas.width = w.innerWidth; canvas.height = w.innerHeight; ctx.translate(canvas.width/2, canvas.height/2); setInterval(function(){ updateScene(); drawScene(ctx); }, 1000/FPS); }(document, window); ]]&gt; &lt;/script&gt; </code></pre> <p>Since the Blogger template is XML, I had to add the CDATA tags. Any ideas on how to fix this?</p> <p>EDIT: This is the error I get when I don't use CDATA:</p> <blockquote> <p>Error parsing XML, line 2101, column 40: Element type "this.vertexes.length" must be followed by either attribute specifications, ">" or "/>"</p> </blockquote> <p>With syntax highlighting, the problem is somewhere around this bit: </p> <pre><code>var x0 = ps.x; rt = (t-this.start_time)/this.take_time; for(i=1; i&lt;this.vertexes.length; i++){ ddt = 0.01; for(dt=0; dt&lt;1; dt+=ddt){ bezier3(dt, this.vertexes[i-1], this.anchors_1[i-1], this.anchors_2[i-1], this.vertexes[i], 1, v); if(perspective(v, camera, ps)){ dz = v.z-camera.z; a = 1-(this.vertexes.length-i+1-dt+rt)/VERTEX_MAX; this.color_f(ctx, a, dz); ctx.lineTo(ps.x, ps.y); ctx.stroke(); ctx.beginPath(); ctx.moveTo(ps.x, ps.y); ddt = dz/TRAIL_QUALITY+0.01; } } } ddt = 0.01; for(dt=0; dt&lt;rt; dt+=ddt){ bezier3(dt, this.start, this.anchor_1, this.anchor_2, this.goal, 1, v); if(perspective(v, camera, ps)){ dz = v.z-camera.z; a = 1-(1-dt+rt)/VERTEX_MAX; this.color_f(ctx, a, dz); ctx.lineTo(ps.x, ps.y); ctx.stroke(); ctx.beginPath(); ctx.moveTo(ps.x, ps.y); ddt = dz/TRAIL_QUALITY+0.01; } } if(perspective(this.pos, camera, ps)){ dz = this.pos.z-camera.z; a = 1-1/VERTEX_MAX; this.color_f(ctx, a, dz); ctx.lineTo(ps.x, ps.y); ctx.stroke(); } }; bezier3 = function(t, a, b, c, d, e, dst){ t /= e; dst.x = a.x*(1-t)*(1-t)*(1-t)+ b.x*3*t*(1-t)*(1-t)+ c.x*3*t*t*(1-t)+ d.x*t*t*t; dst.y = a.y*(1-t)*(1-t)*(1-t)+ b.y*3*t*(1-t)*(1-t)+ c.y*3*t*t*(1-t)+ d.y*t*t*t; dst.z = a.z*(1-t)*(1-t)*(1-t)+ b.z*3*t*(1-t)*(1-t)+ c.z*3*t*t*(1-t)+ d.z*t*t*t; }; perspective = function(point, camera, dst){ var dx = point.x-camera.x; var dy = point.y-camera.y; var dz = point.z-camera.z; if(dz &gt; 0){ dst.x = F*dx/dz; dst.y = F*dy/dz; return true; } return false; </code></pre> <p>Which I kinda understand the issue now, but don't know how to fix it. Blogger is reading that as a beginning tag, rather than a less than statement.</p>
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