<?php
Header("Content-type: image/png");

$picWidth=360*2;
$picHeight=400;
$pic=ImageCreate($picWidth+50,$picHeight+50);

$cWhite=ImageColorAllocate($pic,255,255,255);
$cBlack=ImageColorAllocate($pic,0,0,0);
$cGray=ImageColorAllocate($pic,228,228,228);
$cBlue=ImageColorAllocate($pic,0,0,255);
$cRed=ImageColorAllocate($pic,255,0,0);
$cGreen=ImageColorAllocate($pic,0,255,0);

ImageFilledRectangle($pic,0+20,0,$picWidth+1+25,$picHeight+1,$cWhite);

for ($a=0;$a<=$picHeight+50;$a=$a+90) {
ImageLine($pic, 0, $a-5+25, $picWidth+50, $a-5+25, $cGray);
}

for ($a=0;$a<=$picWidth;$a=$a+90) {
ImageLine($pic, $a+25, 0, $a+25, $picHeight, $cGray);
$b=$a/2;
imagestring($pic, 3, $a-5+25, $picHeight+2, $b."°", $cBlack);
}

ImageLine($pic,0+25,$picHeight/2,$picWidth+25,$picHeight/2,$cGray);

for ($x=1;$x<=360;$x++) {
$x1=($x-1)*($picWidth/360);
$y1=($picHeight/2)-(sin(deg2rad($x-1))*($picHeight/2));
$x2=$x*($picWidth/360);
$y2=($picHeight/2)-(sin(deg2rad($x))*($picHeight/2));
ImageLine($pic, $x1+25, $y1, $x2+25, $y2, $cBlue);
}

for ($x=1;$x<=360;$x++) {
$x1=($x-1)*($picWidth/360);
$y1=($picHeight/2)-(cos(deg2rad($x-1))*($picHeight/2));
$x2=$x*($picWidth/360);
$y2=($picHeight/2)-(cos(deg2rad($x))*($picHeight/2));
ImageLine($pic, $x1+25, $y1, $x2+25, $y2, $cRed);
}

imagestring($pic, 3, 360, $picHeight+20, "----- Sinus", $cBlue);
imagestring($pic, 3, 360, $picHeight+35, "----- Kosinus", $cRed);

ImagePNG($pic);
ImageDestroy($pic);
?>

<?php

print("Hello World !\n");

?>

<?
if(!$_POST["y"]) {
echo "
<center>
<form name=\"form1\" method=\"post\" action=\"funkcija.php\">
Y=&nbsp;<input type=\"test\" name=\"y\">
<input type=\"submit\" name=\"Submit\" value=\"Grafik!\">
</form>
";
}
else {
Header("Content-type: image/png");       //Slanje header-a browseru

            //Osnovne varijable sa sliku
$slDuzina=300;       //Duzina slike
$slSirina=200;       //Sirina slika

            //Osnove varijable za funkciju
$izraz=$_POST["y"];   //Matematicki izraz za y
$xMax=-1000;      //Maksimum funkcije

$sl=ImageCreate($slDuzina,$slSirina);                   //Pravljenje slike

//Funkcije za osnovne boje
$bBijela=ImageColorAllocate($sl,255,255,255);
$bCrna=ImageColorAllocate($sl,0,0,0);
$bSiva=ImageColorAllocate($sl,228,228,228);
$bTamnoSiva=ImageColorAllocate($sl,180,180,180);
$bPlava=ImageColorAllocate($sl,0,0,255);
$bCrvena=ImageColorAllocate($sl,255,0,0);
$bZelena=ImageColorAllocate($sl,0,255,0);

//Odredjivanje minimuma i maksimuma
for ($a=-1000;$a<=1000;$a++) {
$izraz1=str_replace("x", $a,$izraz);
eval("\$y=$izraz1;");
if ($y>$xMax && $y<$slSirina/2) { $xMax = $a; }
}

//Iscrtavanje koordinatnog sistema
ImageLine($sl, $slDuzina/2, 0, $slDuzina/2, $slSirina, $bCrna);    //Y Osa
ImageLine($sl, 0, $slSirina/2, $slDuzina, $slSirina/2, $bCrna);      //X Osa
ImageLine($sl, $slDuzina-10, $slSirina/2-3, $slDuzina, $slSirina/2, Crvena);    //Strelica na
ImageLine($sl, $slDuzina-10, $slSirina/2+3, $slDuzina, $slSirina/2, $bCrvena);      //X osi
ImageLine($sl, $slDuzina/2-3, 10, $slDuzina/2, 0, $bCrvena);   //Strelica na
ImageLine($sl, $slDuzina/2+3, 10, $slDuzina/2, 0, $bCrvena);      //Y osi
ImageString($sl, 3, $slDuzina/2+5, $slSirina/2+5, "0", $bCrna);   //Nula kod koordinatnog pocetka

$x=0;
$lPixX="bla";
$lPixY="bla";
for ($a=0;$a<=$slDuzina/2;$a=$a+$slDuzina/($xMax*2)) {   // Rijesavanje funkcije za crtanje grafika za x>=0
$izraz1=str_replace("x", $x,$izraz);
eval("\$y=$izraz1;");
ImageSetPixel($sl, $a+$slDuzina/2, $slSirina/2-$y, $bPlava);
if ($lPixX!="bla" && $lPixY!="bla") { ImageLine($sl, $lPixX, $lPixY, $a+$slDuzina/2, $slSirina/2-$y, $bPlava); }
$lPixX=$a+$slDuzina/2;
$lPixY=$slSirina/2-$y;
$x++;
}

$x=-$xMax*2;
$lPixX="bla";
$lPixY="bla";
for ($a=-$slDuzina;$a<=0;$a=$a+$slDuzina/($xMax*2)) {   // Rijesavanje funkcije za crtanje grafika x<=0
$izraz1=str_replace("x", $x,$izraz);
eval("\$y=$izraz1;");
ImageSetPixel($sl, $a+$slDuzina/2, $slSirina/2-$y, $bPlava);
if ($lPixX!="bla" && $lPixY!="bla") { ImageLine($sl, $lPixX, $lPixY, $a+$slDuzina/2, $slSirina/2-$y, $bPlava); }
$lPixX=$a+$slDuzina/2;
$lPixY=$slSirina/2-$y;
$x++;
}

//Kraj
ImagePNG($sl);                         //Slanje slike browseru
ImageDestroy($sl);                      //Zatvaranje slike u PHP-u
}
?>
</center>

<?php
   for($x=1;$x<=10;$x++)
   {
      for ($y=1;$y<=10;$y++)
         {
         
      print("<center>Broj $x pomnozen brojem $y daje broj ".($x*$y)."<BR></center>");
         }
   }   
?>