JavaScript: Calculator Script - Landscape Grapher

Main Calculator Script Landscape Grapher

<!-- TWO STEPS TO INSTALL LANDSCAPE GRAPHER:

1.  Copy this part of code inside your HTML HEAD

2.  Add the last code into the BODY of your HTML document  -->

<HEAD><title>JavaScript, java script, javascripts, script, javascript free code!</title>

<!-- Begin

var WIDTH = 1;

var XA = 0;

var XB = 17;

var YA = 0;

var YB = 17;

var Z1 = 0;

var Z2 = 0;

var Z3 = 0;

var Z4 = 0;

var XADD = 10; // move x axis left on screen

var YADD = -8; // lower y axis view

var LEVEL_UNDEFINED = 99999;

var LEVEL_WATER = -1;

picType = new Array();

pic = new Array();

var steep;

var sealevel;

var buf = "";

var buf2 = "";

var pic0;

function ZColor ( z0) {

var t1;

if ( z0 == LEVEL_WATER ) {

return '<TT>' + "S" + "</TT>";

}

if ( z0 == LEVEL_UNDEFINED ) {

return '<TT>' + "S" + "</TT>";

}

t1 = z0 % 10;

if ( t1 == 0 ) {

return '<TT>' + "0" + "</TT>";

}

if ( t1 == 1 ) {

return '<TT>' + "1" + "</TT>";

}

if ( t1 == 2 ) {

return '<TT>' + "2" + "</TT>";

}

if ( t1 == 3 ) {

return '<TT>' + "3" + "</TT>";

}

if ( t1 == 4 ) {

return '<TT>' + "4" + "</TT>";

}

if ( t1 == 5 ) {

return '<TT>' + "5" + "</TT>";

}

if ( t1 == 6 ) {

return '<TT>' + "6" + "</TT>";

}

if ( t1 == 7 ) {

return '<TT>' + "7" + "</TT>";

}

if ( t1 == 8 ) {

return '<TT>' + "8" + "</TT>";

}

if ( t1 == 9 ) {

return '<TT>' + "9" + "</TT>";

}

function frac( x0, y0, x2, y2, z0, z1, z2, z3 ) {

var newz, xmid, ymid, z01, z12, z23, z30;

//  50% chance rise or descend

if ( Math.random() < 0.5 ) {

newz = Math.round( (z0+z1+z2+z3) / 4) + Math.round( Math.random() * (y2-y0) * steep );

}

else {

newz = Math.round( (z0+z1+z2+z3) / 4) - Math.round( Math.random() * (y2-y0) * steep );

}

xmid = ( x0 + x2) >> 1;

ymid = ( y0 + y2) >> 1;

z12 =  ( z1 + z2) >> 1;

z30 =  ( z3 + z0) >> 1;

z01 =  ( z0 + z1) >> 1;

z23 =  ( z2 + z3) >> 1;

if ( (( x2 - x0 ) > WIDTH ) && (( y2 - y0 ) > WIDTH )) {

frac( x0, y0, xmid, ymid, z0, z01, newz, z30);

frac( xmid, y0, x2, ymid, z01, z1, z12, newz);

frac( x0, ymid, xmid, y2, z30, newz, z23, z3);

frac( xmid, ymid, x2, y2, newz, z12, z2, z23);

}

else {

if ( newz <= sealevel ) {

// above sea level

picType[ymid*YB+xmid] = "l";

pic[ymid*YB+xmid] = newz;

}

else {

//  below "sea level"

picType[ymid*YB+xmid] = "s";

pic[ymid*YB+xmid] = LEVEL_WATER;

}

function landscape() {

for (var i = 0; i < XB; i++) {

for (var j = 0; j < YB; j++) {

picType[j*YB+i] = "u";

}

for (var i = 0; i < XB; i++) {

for (var j = 0; j < YB; j++) {

pic[j*YB+i] = LEVEL_UNDEFINED;

}

steep = ( Math.random() / 2.5 ) + 0.5;

sealevel = Math.round( 17 * Math.random() ) - 8;

Z1 = Math.round( 15 * Math.random() ) - 7;

Z2 = Math.round( 15 * Math.random() ) - 7;

Z3 = Math.round( 15 * Math.random() ) - 7;

Z4 = Math.round( 15 * Math.random() ) - 7;

frac( XA, YA, XB, YB, Z1, Z2, Z3, Z4);

for (var i = 0; i < XB; i++) {

for (var j = 0; j < YB; j++) {

pic0 = LEVEL_UNDEFINED;

if ( picType[j*YB+i] == "l" )  {

pic0 = Math.abs(pic[j*YB+i] - sealevel);

}

if ( picType[j*YB+i] == "s" )  {

pic0 = LEVEL_WATER;

}

buf2 = buf2 + ZColor( pic0 ) + " ";

}

buf2 = buf2 + " ";

}

return buf2;

}

//  End -->

</script>

</HEAD>

<BODY>

<!--

document.write ( landscape() );

// -->

</script>

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