Визуализация графиков функций на языке JavaScript
Посмотрите, пожалуйста, как я визуализировал графики функций на странице
Вся эта страница занимает 8 килобайт, а язык программирования - JavaScript, также используются языки разметки SVG и HTML.
Ниже - ВЕСЬ код страницы:
<html>
<body onload="CARE(); PLOTbuild();">
<br>
<h2>Graphing calc</h2>
<br>
Xmin= <input id="xMin" value="0" type="text" size="10">
Xmax= <input id="xMax" value="10" type="text" size="10">
Xstep= <input id="xStep" value="1" type="text" size="10">
<br>
f(x)= <input id="tCare" value="x^2; sin(x); exp(x); log(x)" type="text" size="40">
<script>
var h1 = 20; var h2 = 580; var v1 = 360; var v2 = 10; var x1=0; var x2=0; var x3=0; var x4=0;
var y1=0; var y2=0; var y3=0; var OXaxis=0; var OYaxis=0;
var xcol=0; var ycol=1; var fsize = "12"; var plotColor="red"
var elements = ['', '']; var sTemp=""; var OXscale=""; var OYscale="";
function PLOTbuild()
{
OXaxis=0; OYaxis=0;
var FromToX = NUMBERseries(x1, x2, x3); OXscale = TEXTscale(FromToX, h1, h2);
var FromToY = NUMBERseries(y1, y2, y3); OYscale = TEXTscale(FromToY, v1, v2);
var targ = document.getElementById('target').value;
var stringsOX = OXscale.split("\n"); var stringsOY = OYscale.split("\n");
var tableStringsT = targ.split("\n"); var SIMPLEpoly = '';
for (var i = 1; i < tableStringsT.length-1; i = i + 1)
{
elements = tableStringsT[i].split("\t");
sTemp = elements[xcol] + ';' + elements[ycol];
SIMPLEpoly = SIMPLEpoly + convert2ValuesTo2Coordinates(sTemp, x1, x2, y1, y2, h1, h2, v1, v2) + '\n';
}
SIMPLEpoly = SIMPLEpoly.replace(/;/g, ',');
var sSVG = "<polyline fill='none' stroke='" + plotColor + "' stroke-width='1' points='";
sSVG = sSVG + SIMPLEpoly + "' />";
sSVG = sSVG + "\n" + "<polyline fill='none' stroke='#000000' stroke-width='0.5' points='";
sSVG = sSVG + h1 + "," + OYaxis + " " + h2 + "," + OYaxis + "' />";
for (var i = 0; i < stringsOX.length; i++)
{
elements = stringsOX[i].split("\t");
var OXshift1 = OYaxis + 10; var OYshift1 = h1 + 20;
var nOXsh2 = parseFloat(elements[1]) - 4; var nOYsh3 = OYaxis + 18;
sSVG = sSVG + "\n" + "<polyline fill='none' stroke='#000000' stroke-width='0.5' points='";
sSVG = sSVG + elements[1] + "," + OYaxis + " " + elements[1] + "," + OXshift1 + "' />";
sSVG = sSVG + "\n" + "<text x='" + nOXsh2 + "' y='" + nOYsh3 +
"' fill='black' font-family='Arial' font-size='" + fsize + "'>" + elements[2] + "</text>";
}
sSVG = sSVG + "\n" + "<polyline fill='none' stroke='#000000' stroke-width='0.5' points='" + OXaxis + ",";
sSVG = sSVG + v1 + " " + OXaxis + "," + v2 + "' />";
for (var i = 0; i < stringsOY.length; i++)
{
elements = stringsOY[i].split("\t");
sTemp=elements[2];
if (i == (stringsOY.length-1)) sTemp=document.getElementById("SM01").options[ycol].text;
OXshift1 = v1 + 10; OYshift1 = OXaxis + 10;
sSVG = sSVG + "\n" + "<polyline fill='none' stroke='#000000' stroke-width='0.5' points='" + OXaxis + ",";
sSVG = sSVG + elements[1] + " " + OYshift1 + "," + elements[1] + "' />";
sSVG = sSVG + "\n" + "<text x='" + OYshift1 + "' y='" + elements[1] + "' fill='" + plotColor +
"' font-family='Arial' font-size='" + fsize + "'>" + sTemp + "</text>";
}
document.getElementById('boldStuff').innerHTML = "<svg version='1.1' width='" + '700' + "' height='" + '400' + "' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink'>" + sSVG + "\n" + "</svg>";
}
function TEXTscale(x1xN, min4, max4)
{
var pieces = x1xN.split(";");
var qx = pieces.length-1;
var sm3 = ""; var smpp=0;
for (var i = 0; i < qx; i = i + 1)
{
smpp = parseFloat(pieces[i]); sm3 = sm3 + smpp; sm3 = sm3 + "\t";
xx1=parseFloat(pieces[0]);
xx2=parseFloat(pieces[qx]);
xAmong=smpp;
part = (xAmong - xx1) / (xx2 - xx1); smart2=(max4 - min4) * part + min4;
smart2 = NUMBERfloat(smart2, 0.001);
sm3 = sm3 + smart2;
sm3 = sm3 + "\t" + smpp + "\n";
if (smpp == 0)
{
if (OXaxis == 0) {OXaxis=smart2;} else {OYaxis=smart2;}
}
}
coo = NUMBERfloat(max4, 0.0001);
sm3 = sm3 + x2+"\t"+coo+"\t"+x2;
return sm3;
}
function convert2ValuesTo2Coordinates(xy, x1, x2, y1, y2, xa41, xa42, ya41, ya42)
{
var srav = xy.split(";");
var gett = convert1ValueTo1Coordinate(x1, x2, xa41, xa42, srav[0]) + ";" + convert1ValueTo1Coordinate(y1, y2, ya41, ya42, srav[1]); return gett;
}
function convert1ValueTo1Coordinate(zx1, zx2, a1, a2, xVECTOR1)
{
return (a2-a1) * (xVECTOR1 - zx1) / (zx2 - zx1) + a1;
}
function NUMBERfloat(xbig, xsmall)
{
vmax = Math.floor(xbig / xsmall + 0.99) * xsmall; vmax = vmax.toFixed(10);
vmax = vmax * 1; return vmax;
}
function NUMBERseries(f, t, vStep)
{
var s = "";
for (var x = f; x < t; x = x + vStep)
{
s = s + NUMBERfloat(x, vStep) + ";"
}
s=s+t; return s;
}
function CARE()
{
ycol = document.getElementById("SM01").options.selectedIndex;
var s = document.getElementById("target").value;
var arrayOfTableStrings = s.split("\n");
var midC = 0;
var minC = 0;
var maxC = 0;
for (var i = 1; i < arrayOfTableStrings.length - 1; i++)
{
STRINGelements = arrayOfTableStrings[i].split("\t");
midC = parseFloat(STRINGelements[ycol]);
if (maxC < midC)
maxC = midC;
if (minC > midC)
minC = midC;
}
a = NUMBERfloat(minC, 0.001);
b = NUMBERfloat(maxC, 0.001);
var xr = Math.abs(b - a) / 10;
var mimi = Math.abs(a / xr) / 10 * 5;
if (mimi < 1)
{
a = 0;
xr = Math.abs(b - a) / 10;
}
var loga = Math.log10(xr);
var inta = Math.floor(loga);
var deca = Math.pow(10, inta);
var mi1 = Math.floor(a / deca);
var ma1 = Math.ceil(b / deca);
var xMIN=document.getElementById('xMin').value;
x1=parseFloat(xMIN);
var xMAX=document.getElementById('xMax').value;
x2=parseFloat(xMAX);
var xStep=document.getElementById('xStep').value;
x3=parseFloat(xStep); if (x3 == 0) x3=x2-x1;
x4=x3/10;
y1 = NUMBERfloat(mi1 * deca, 0.001);
y2 = NUMBERfloat(ma1 * deca, 0.001);
y3=(y2-y1)/10;
var xtemp=0;
var textToSave = document.getElementById("tCare").value;
textToSave=textToSave.replace('log', 'Math.log');
textToSave=textToSave.replace('exp', 'Math.exp');
textToSave=textToSave.replace('sin', 'Math.sin');
textToSave=textToSave.replace('cos', 'Math.cos');
var tts= textToSave.split(";");
var s='';
var i=0;
var j=0;
for(i=x1; i<x2;i=i+x4){
s=s+NUMBERfloat(i, 0.001);
for(j=0; j<tts.length;j++){
xtemp=eval('x='+i+'; '+caretReplace(tts[j]))
s=s+'\t'+NUMBERfloat(xtemp, 0.001);
}
s=s+'\n';
if (i>=parseFloat(xMax))break;
}
document.getElementById("target").value = s;
}
var caretReplace = function(_s) {
if (_s.indexOf("^") > -1) {
var tab = [];
var powfunc="Math.pow";
var joker = "___joker___";
while (_s.indexOf("(") > -1) {
_s = _s.replace(/(\([^\(\)]*\))/g, function(m, t) {
tab.push(t);
return (joker + (tab.length - 1));
});
}
tab.push(_s);
_s = joker + (tab.length - 1);
while (_s.indexOf(joker) > -1) {
_s = _s.replace(new RegExp(joker + "(\\d+)", "g"), function(m, d) {
return tab[d].replace(/(\w*)\^(\w*)/g, powfunc+"($1,$2)");
});
}
}
return _s;
};
</script>
<SELECT name="SM01" id="SM01" onchange="CARE(); PLOTbuild()">
<OPTION SELECTED VALUE="0">SELECT YOUR FUNCTION</OPTION>
<OPTION VALUE="1">x^2</OPTION>
<OPTION VALUE="2">sin(x)</OPTION>
<OPTION VALUE="3">exp(x)</OPTION>
<OPTION VALUE="4">log(x)</OPTION>
</SELECT>
<br>
<textarea class="input_type" id="target" name="target" cols="28" rows="28" wrap="off"></textarea>
<b id="boldStuff" style="color:transparent;">SVG</b>
</body>
</html>