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<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>
RegularNGons
</title>
<style>
.emscripten {
padding-right: 0;
margin-left: auto;
margin-right: auto;
display: block;
}
textarea.emscripten {
font-family: monospace;
width: 80%;
}
.outer {
display: table;
position: absolute;
height: 100%;
width: 100%;
}
.middle {
display: table-cell;
vertical-align: middle;
}
.inner {
margin-left: auto;
margin-right: auto;
width: 960px;
}
.center {
text-align: center;
}
</style>
</head>
<body onload="go()">
<div class="outer">
<div class="middle">
<div class="inner">
<div class="center">
<span id="status">Status: Initializing</span>
<button id="start_stop" disabled="true" onclick="start_stop_button()">Pause computations</button>
</div>
<textarea class="emscripten" id="output" rows="10" cols="80">Welcome to RegularNGons (https://github.com/kovzol/RegularNGons)...
</textarea><br>
<div id="applet_container" class="emscripten"></div>
</div>
</div>
</div>
<script type="text/javascript" src="https://cdn.geogebra.org/apps/deployggb.js"></script>
<script type='text/javascript'>
async function reload() {
output("Attempt to restart page from this point again");
outputElapsedTime();
var url = window.location.href;
if (cont == "")
url += '&c=' + server_id;
await sleep(5000);
window.location.href = url;
}
function compute(inputString) { // compute a Giac command and return the output
var caseval = Module.cwrap('caseval', 'string', ['string']);
try {
return caseval(inputString);
} catch (err) {
output("Error during Giac computation on s=" + s);
reload();
}
}
// https://css-tricks.com/snippets/javascript/get-url-variables/
function getQueryVariable(variable) {
var query = window.location.search.substring(1);
var vars = query.split("&");
for (var i = 0; i < vars.length; i++) {
var pair = vars[i].split("=");
if (pair[0] == variable) {
return pair[1];
}
}
return (false);
}
/* Compute the xth element among \binom{n}{2}.
* (a,b) is a pair where 0<=a<b<N.
*/
function deserialize(x, N) {
var a = Math.floor(((2 * N - 1) - Math.sqrt((2 * N - 1) * (2 * N - 1) - 8 * x)) / 2);
var b = (2 * x + a * a - (2 * N - 3) * a) / 2 + 1;
// console.log("deserialize(" + x + "," + N + ")=" + a+ "," + b);
return {
"a": a,
"b": b
}
}
function go() {
n = getQueryVariable("n");
status_div = document.getElementById('status');
if (!n) errorOutput("Please append &n=... to the URL");
if (n < 3) errorOutput("Invalid n: " + n + " (please use a number >= 3)");
ab = n * (n - 1) / 2;
cd = (ab - 1) / 2;
abcd = ab * cd;
efgh = (abcd - 1) / 2;
smax = abcd * efgh;
// on startup
if (typeof s === 'undefined') {
// Setup GeoGebra
var parameters = {
"id": "ggbApplet",
"width": 960,
"height": 600,
"showToolBar": true,
"borderColor": null,
"showMenuBar": true,
"allowStyleBar": true,
"showAlgebraInput": false,
"enableLabelDrags": true,
"enableShiftDragZoom": true,
"capturingThreshold": null,
"showToolBarHelp": false,
"errorDialogsActive": true,
"showTutorialLink": true,
"showLogging": true,
"useBrowserForJS": false,
"perspective": "AG"
};
var applet = new GGBApplet(parameters, '5.0', 'applet_container');
applet.inject('applet_container');
s = getQueryVariable("s");
if (!s) {
output("Assuming s=0, please append &s=... to the URL to override");
s = 0;
}
output("Starting with n=" + n + ", s=" + s);
onlyX = getQueryVariable("u");
if (!onlyX) {
onlyX = 0;
}
if (onlyX != 0) {
output("Considering only results d=" + onlyX);
}
mindegree = getQueryVariable("m");
if (!mindegree) {
output("Assuming mindegree=1, please append &m=... to the URL to override");
mindegree = 1;
}
maxdegree = getQueryVariable("M");
if (!maxdegree) {
output("Assuming maxdegree=2, please append &M=... to the URL to override");
maxdegree = 2;
}
symm = getQueryVariable("S");
if (!symm) {
output("Not ignoring symmetry, please append &S=0 to the URL to ignore (this speeds up computation)");
symm = 1;
}
found = getQueryVariable("f");
if (!found) {
output("Not ignoring already found lengths, please append &f=1 to override");
found = 0;
}
approx = getQueryVariable("a");
bestapprox = Infinity;
if (!approx) {
approx = 0;
}
server = getQueryVariable("z");
cont = getQueryVariable("c");
if (!server) {
server = "";
} else if (!cont) {
var query = window.location.search.substring(1);
server_id = post("action=register¶meters=" + encodeURIComponent(query));
if (server_id.length != 7) {
errorOutput("Server communication to " + server + " seems not working");
}
output("Obtained job ID " + server_id);
}
if (!cont) {
cont = "";
} else {
cont_eval = post("action=continue&id=" + cont);
server_id = cont;
}
epsilon = getQueryVariable("E");
if (!epsilon) {
epsilon = Infinity;
output("Assuming epsilon=" + epsilon + ", please append &E=... to the URL to override");
}
sol = 0;
notchecked = 0;
startTime = new Date();
foundlist = [];
output("s can be incremented until " + smax);
e = getQueryVariable("e");
if (e) {
output("Computation will stop at " + e);
} else {
e = smax;
}
output("Waiting for the CAS...")
}
if (s < 0 || s >= smax) errorOutput("Invalid s: " + s);
var segment = deserialize(s, abcd);
var ABCD = segment['a'];
var EFGH = segment['b'];
var R = deserialize(ABCD, ab);
var AB = R['a'];
var CD = R['b'];
var A_B_ = deserialize(AB, n);
var C_D_ = deserialize(CD, n);
var S = deserialize(EFGH, ab);
var EF = S['a'];
var GH = S['b'];
var E_F_ = deserialize(EF, n);
var G_H_ = deserialize(GH, n);
A = A_B_['a'];
B = A_B_['b'];
C = C_D_['a'];
D = C_D_['b'];
E = E_F_['a'];
F = E_F_['b'];
G = G_H_['a'];
H = G_H_['b'];
// console.log("A = " + A + ", B = " + B + ", C = " + C + ", D = " + D + ", E = " + E + ", F = " + F + ", G = " + G + ", H = " + H);
}
function post(message) {
var xhttp = new XMLHttpRequest();
xhttp.open("POST", server, false);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send(message);
return xhttp.responseText;
}
function heartbeat() {
var changes = "s=" + s + ";";
changes += "foundlist=" + JSON.stringify(foundlist) + ";";
changes += "sol=" + sol + ";";
changes += "bestapprox=" + bestapprox + ";";
changes += "startTime=new Date(" + JSON.stringify(startTime) + ");";
post("action=heartbeat&id=" + server_id + "&changes=" + encodeURIComponent(changes));
}
function CASinitCommands() {
compute("restart;");
var factorsqrfree = "factorsqrfree(p):=begin local pf,r,ii; pf:=factor(p); if (sommet(pf)!='*') begin if (sommet(pf)=='^') return op(pf)[0]; else begin if (sommet(pf)!=sommet(-x)) return pf; else return factorsqrfree(-pf); end; end; opf:=op(pf); r:=1; for ii from 0 to size(opf)-1 do r:=r*factorsqrfree(opf[ii]); od return r end";
var cos2piOverNMinpoly = "cos2piOverNMinpoly(n):=begin local j, p, q, r; p:=simplify((tchebyshev1(n)-1)/(x-1)); for j from 1 to n/2 do q:=tchebyshev1(j)-1; r:=gcd(p,q); p:=simplify(p/r); od; return factorsqrfree(primpart(p)); end";
compute("caseval(\"init geogebra\");");
compute(factorsqrfree);
compute(cos2piOverNMinpoly);
}
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
function start_stop_button() {
var buttontext = "Pause computations";
if (!running) {
running = true;
} else {
running = false;
buttontext = "Continue computations";
status_div.innerHTML = "Status: Paused while computing n=" + n + ", s=" + s;
}
var element = document.getElementById('start_stop');
element.innerHTML = buttontext;
}
async function doCAScomputation() {
running = true;
var element = document.getElementById('start_stop');
element.disabled = false;
CASinitCommands();
if (cont != "") {
output("Attempt to continue a previous run...");
eval(cont_eval);
ggb = ggb.replace(/ /g, "+");
ggbApplet.setBase64(ggb);
if (!(typeof fulllog === 'undefined')) {
element = document.getElementById('output');
var oldValue = element.value;
element.value = oldValue + fulllog;
element.scrollTop = 99999;
}
}
while (s < e - 1) {
if (symm == 1 || (A == 0 && 2 * B <= n)) {
CAScomputeCurrent();
await sleep(1);
while (!running) {
await sleep(300);
}
} else {
notchecked++;
}
s++;
go();
if (server != "" && s % 10000 == 0 && s > 0) {
output("Avoiding crash, normal restart...");
reload();
}
}
CAScomputeCurrent();
outputElapsedTime();
output("Finished after finding " + sol + " solutions");
output(notchecked + " cases were not checked to ignore symmetry");
hide_button();
}
function hide_button() {
var element = document.getElementById('start_stop');
element.hidden = true;
}
function output(text) {
console.log("OUTPUT: " + text);
var element = document.getElementById('output');
var oldValue = element.value;
element.value = oldValue + text + "\n";
element.scrollTop = 99999;
if (typeof ggbApplet != 'undefined' && server != "") {
post("action=update&id=" + server_id + "&update=" + text + "&ggb=" +
encodeURIComponent(ggbApplet.getBase64()));
}
}
function outputElapsedTime() {
var endTime = new Date();
var timeDiff = endTime - startTime;
timeDiff /= 1000;
var seconds = Math.round(timeDiff % 60);
timeDiff = Math.floor(timeDiff / 60);
var minutes = Math.round(timeDiff % 60);
timeDiff = Math.floor(timeDiff / 60);
var hours = Math.round(timeDiff % 24);
output("Elapsed time: " + hours + "h " + minutes + "m " + seconds + "s");
}
function errorOutput(text) {
output(text);
outputElapsedTime();
hide_button();
throw(text);
}
function CAScomputeCurrent() {
done = false;
// c=cos(2pi/n)
console.log("n=" + n + ", s=" + s);
status_div.innerHTML = "Status: Computing n=" + n + ", s=" + s;
if (server != "" && s > 0 && s % 100 == 0)
heartbeat();
var c = compute("subst(cos2piOverNMinpoly(" + n + "),[x=c]);");
// s=sin(2pi/n)
var s_ = "s^2+c^2-1";
var d = "0,"; // technical trick
// P0=(0,0), P1=(1,0)
var p = "p0x,p0y,p1x-1,p1y";
var maxindex = Math.max(B, C, D, E, F, G, H);
var v = "c,s,ax,ay,bx,b_y,cx,cy,dx,dy,ex,ey,fx,fy,gx,gy,hx,hy,qx,qy,rx,ry";
// defining vertex points and segment endpoints
for (var i = 0; i <= maxindex; ++i) {
var px = "p" + i + "x";
var py = "p" + i + "y";
v += "," + px + "," + py;
if (i > 1) {
var ppx = "p" + (i - 1) + "x";
var ppy = "p" + (i - 1) + "y";
var pppx = "p" + (i - 2) + "x";
var pppy = "p" + (i - 2) + "y";
p += ",-" + px + "-s*" + ppy + "+" + ppx + "+c*" + ppx + "+s*" + pppy + "-c*" + pppx;
p += ",-" + py + "+" + ppy + "+c*" + ppy + "+s*" + ppx + "-c*" + pppy + "-s*" + pppx;
}
if (A == i) d += ",ax-" + px + ",ay-" + py;
if (B == i) d += ",bx-" + px + ",b_y-" + py;
if (C == i) d += ",cx-" + px + ",cy-" + py;
if (D == i) d += ",dx-" + px + ",dy-" + py;
if (E == i) d += ",ex-" + px + ",ey-" + py;
if (F == i) d += ",fx-" + px + ",fy-" + py;
if (G == i) d += ",gx-" + px + ",gy-" + py;
if (H == i) d += ",hx-" + px + ",hy-" + py;
}
// AQB, CQD are collinear:
var q = "ax*qy+qx*b_y+bx*ay-ax*b_y-qx*ay-bx*qy,cx*qy+qx*dy+dx*cy-cx*dy-qx*cy-dx*qy";
// ERF, GRH are collinear:
var r = "ex*ry+rx*fy+fx*ey-ex*fy-rx*ey-fx*ry,gx*ry+rx*hy+hx*gy-gx*hy-rx*gy-hx*ry";
// the requested length is QR=d
var qr = "d^2-(qx-rx)^2-(qy-ry)^2";
var ideal = c + "," + s_ + "," + p + "," + d + "," + q + "," + r + "," + qr;
var eliminatecommand = "eliminate([" + ideal + "],[" + v + "]);";
var eliminate = compute(eliminatecommand);
var normresultcommand = "expand(" + eliminate + ")/lcoeff(" + eliminate + ",d);";
eliminate = compute(normresultcommand);
var factorscommand = "factors(" + eliminate + ");";
var factors = compute(factorscommand);
var factor1command = factors + "[0][0]";
var factor1 = compute(factor1command);
// don't consider d=0
if (factor1 != "d") {
var degreecommand = "degree(" + factor1 + ");";
var degree = compute(degreecommand);
var deg = Number(degree);
var accepted;
var factorcommand;
var factor;
var solvecommand;
var solve;
accepted = (deg >= mindegree && deg <= maxdegree);
if (accepted) {
factorcommand = "factor(" + eliminate + ");";
factor = compute(factorcommand);
solvecommand = "solve([" + factor + "=0,d>0])";
solve = compute(solvecommand);
}
if (accepted && onlyX != 0 && solve != "{{d=" + onlyX + "}}") {
accepted = false;
}
if (accepted && found == 1) {
var founditem = false;
for (var i = 0; i < foundlist.length && !founditem; ++i)
founditem = foundlist[i] == eliminate;
accepted = !founditem;
}
if (accepted && approx != 0) {
accepted = false;
var fsolvecommand = "fsolve(" + factor1 + ")";
var fsolve = compute(fsolvecommand);
var rootlist = fsolve.substr(1, fsolve.length - 2);
var roots = rootlist.split(",");
for (var i = 0; i < roots.length; ++i) {
var diff = Math.abs(Number(roots[i]) - approx);
if (diff <= Math.abs(bestapprox - approx) && Number(roots[i]) != approx) {
if (epsilon > diff) {
bestapprox = roots[i];
output("Found better approximation: " + bestapprox);
accepted = true;
}
}
}
}
if (accepted) {
output("n=" + n + ", s=" + s + ": A=" + A + ", B=" + B + ", C=" + C +
", D=" + D + ", E=" + E + ", F=" + F + ", G=" + G + ", H=" + H + ": " + (eliminate + ", " +
solve).replace(/d/g, "RS"));
foundlist.push(eliminate);
sol = sol + 1;
var lAB;
var lCD;
var lEF;
var lGH;
if (A < B) lAB = A + "," + B; else lAB = B + "," + A;
var ld = "l_{" + lAB + "}";
if (!ggbApplet.exists(ld)) {
ggbApplet.evalCommand(ld + "=Line(A_{" + A + "},A_{" + B + "})");
ggbApplet.setColor(ld, 192, 192, 192);
ggbApplet.setLabelVisible(ld, false);
}
if (C < D) lCD = C + "," + D; else lCD = D + "," + C;
var le = "l_{" + lCD + "}";
if (!ggbApplet.exists(le)) {
ggbApplet.evalCommand(le + "=Line(A_{" + C + "},A_{" + D + "})");
ggbApplet.setColor(le, 192, 192, 192);
ggbApplet.setLabelVisible(le, false);
}
if (E < F) lEF = E + "," + F; else lEF = E + "," + F;
var lf = "l_{" + lEF + "}";
if (!ggbApplet.exists(lf)) {
ggbApplet.evalCommand(lf + "=Line(A_{" + E + "},A_{" + F + "})");
ggbApplet.setColor(lf, 192, 192, 192);
ggbApplet.setLabelVisible(lf, false);
}
if (G < H) lGH = G + "," + H; else lGH = H + "," + H;
var lg = "l_{" + lGH + "}";
if (!ggbApplet.exists(lg)) {
ggbApplet.evalCommand(lg + "=Line(A_{" + G + "},A_{" + H + "})");
ggbApplet.setColor(lg, 192, 192, 192);
ggbApplet.setLabelVisible(lg, false);
}
var pR1 = "R_{" + lAB + "," + lCD + "}";
var pR2 = "R_{" + lCD + "," + lAB + "}";
var pR;
if (ggbApplet.exists(pR1)) pR = pR1;
else if (ggbApplet.exists(pR2)) pR = pR2;
else {
pR = pR1;
ggbApplet.evalCommand(pR + "=Intersect(" + ld + "," + le + ")");
ggbApplet.setVisible(pR, false);
}
var pS1 = "S_{" + lEF + "," + lGH + "}";
var pS2 = "S_{" + lGH + "," + lEF + "}";
var pS;
if (ggbApplet.exists(pS1)) pS = pS1;
else if (ggbApplet.exists(pS2)) pS = pS2;
else {
pS = pS1;
ggbApplet.evalCommand(pS + "=Intersect(" + lf + "," + lg + ")");
ggbApplet.setVisible(pS, false);
}
var sRS = "RS_{" + sol + "}";
ggbApplet.evalCommand(sRS + "=Segment(" + pR + "," + pS + ")");
ggbApplet.setLabelVisible(sRS, false);
if (accepted && approx != 0) {
var sRSlength = ggbApplet.getValue(sRS);
if (Math.abs(sRSlength - bestapprox) > 0.01) {
output("Geometrically non-matching case, consider looking for a star-regular variant");
ggbApplet.setColor(sRS, 64, 0, 0);
}
} else {
ggbApplet.setColor(sRS, 0, 0, 64);
}
}
}
done = true;
}
</script>
<script type='text/javascript'>
var Module = {
preRun: [],
postRun: [],
printErr: function (text) {
if (0) { // XXX disabled for safety typeof dump == 'function') {
dump(text + '\n'); // fast, straight to the real console
} else {
console.log(text);
}
},
setStatus: function (text) {
if (Module.setStatus.interval) clearInterval(Module.setStatus.interval);
var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
if (m) text = m[1];
console.log("Giac status = " + text);
if (text == "") { // ready to go
outputElapsedTime();
output("...CAS is up and running");
output("Setting up GeoGebra applet");
ggbApplet.setCustomToolBar("0|14");
// ggbApplet.setAxesVisible(false,false);
ggbApplet.setAxesVisible(1, false, false, false);
ggbApplet.evalCommand("A=(0,0)");
ggbApplet.evalCommand("B=(1,0)");
ggbApplet.evalCommand("poly1=Polygon(A,B," + n + ")");
ggbApplet.setLabelVisible("poly1", false);
for (i = 0; i < n; ++i) {
var oldLabel = String.fromCharCode(65 + (i % 24));
if (oldLabel == 'X') oldLabel = 'Z';
var index = Math.floor(i / 24);
if (index > 0) {
oldLabel += "_" + index
}
var newLabel = "A_{" + i + "}";
ggbApplet.renameObject(oldLabel, newLabel);
ggbApplet.setVisible(newLabel, false);
}
doCAScomputation();
}
},
totalDependencies: 0,
monitorRunDependencies: function (left) {
this.totalDependencies = Math.max(this.totalDependencies, left);
Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies - left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
}
};
Module.setStatus('Downloading...');
</script>
<script src="giac.js"></script>
</body>
</html>