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Ingy döt Net 2023-07-01 11:58:00 -04:00
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commit f23f22d71c
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Task/Sierpinski-triangle-Graphical/JavaScript/sierpinski-triangle-graphical.js Normal file
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<!-- SierpinskiTriangle.html -->
<html>
<head><title>Sierpinski Triangle Fractal</title>
<script>
// HF#1 Like in PARI/GP: return random number 0..max-1
function randgp(max) {return Math.floor(Math.random()*max)}
// HF#2 Random hex color
function randhclr() {
return "#"+
("00"+randgp(256).toString(16)).slice(-2)+
("00"+randgp(256).toString(16)).slice(-2)+
("00"+randgp(256).toString(16)).slice(-2)
}
// HFJS#3: Plot any matrix mat (filled with 0,1)
function pmat01(mat, color) {
// DCLs
var cvs = document.getElementById('cvsId');
var ctx = cvs.getContext("2d");
var w = cvs.width; var h = cvs.height;
var m = mat[0].length; var n = mat.length;
// Cleaning canvas and setting plotting color
ctx.fillStyle="white"; ctx.fillRect(0,0,w,h);
ctx.fillStyle=color;
// MAIN LOOP
for(var i=0; i<m; i++) {
for(var j=0; j<n; j++) {
if(mat[i][j]==1) { ctx.fillRect(i,j,1,1)};
}//fend j
}//fend i
}//func end
// Prime function
// Plotting Sierpinski triangle. aev 4/9/17
// ord - order, fn - file name, ttl - plot title, clr - color
function pSierpinskiT() {
var cvs=document.getElementById("cvsId");
var ctx=cvs.getContext("2d");
var w=cvs.width, h=cvs.height;
var R=new Array(w);
for (var i=0; i<w; i++) {R[i]=new Array(w)
for (var j=0; j<w; j++) {R[i][j]=0}
}
ctx.fillStyle="white"; ctx.fillRect(0,0,w,h);
for (var y=0; y<w; y++) {
for (var x=0; x<w; x++) {
if((x & y) == 0 ) {R[x][y]=1}
}}
pmat01(R, randhclr());
}
</script></head>
<body style="font-family: arial, helvatica, sans-serif;">
<b>Please click to start and/or change color: </b>
<input type="button" value=" Plot it! " onclick="pSierpinskiT();">&nbsp;&nbsp;
<h3>Sierpinski triangle fractal</h3>
<canvas id="cvsId" width="640" height="640" style="border: 2px inset;"></canvas>
<!--canvas id="cvsId" width="1280" height="1280" style="border: 2px inset;"></canvas-->
</body></html>