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<![CDATA[
<?php
/////////////////////////////////////////////////////
// configurazione della griglia :
$righe=100;
$colonne=100;
$spessore=1;
/////////////////////////////////////////////////////
function linea_size1($x1, $y1, $x2, $y2, $colore) {
global $tabella;
for ($x=$x1; $x<=$x2; $x++) {
$y=($y2-$y1)/($x2-$x1)*$x+($y1*$x2-$y2*$x1)/($x2-$x1);
$tabella[$x][$y]="$colore";
}
}
function linea_size2($x1, $y1, $x2, $y2, $colore) {
global $tabella;
for ($x=$x1; $x<=$x2; $x++) {
$y=($y2-$y1)/($x2-$x1)*$x+($y1*$x2-$y2*$x1)/($x2-$x1);
$tabella[$x][$y-1]="$colore";
$tabella[$x+1][$y-1]="$colore";
$tabella[$x-1][$y]="$colore";
$tabella[$x][$y]="$colore";
$tabella[$x+1][$y]="$colore";
$tabella[$x+2][$y]="$colore";
$tabella[$x-1][$y+1]="$colore";
$tabella[$x][$y+1]="$colore";
$tabella[$x+1][$y+1]="$colore";
$tabella[$x+2][$y+1]="$colore";
$tabella[$x][$y+2]="$colore";
$tabella[$x+1][$y+2]="$colore";
}
}
function linea_size3($x1, $y1, $x2, $y2, $colore) {
global $tabella;
for ($x=$x1; $x<=$x2; $x++) {
$y=($y2-$y1)/($x2-$x1)*$x+($y1*$x2-$y2*$x1)/($x2-$x1);
$tabella[$x-1][$y-2]="$colore";
$tabella[$x][$y-2]="$colore";
$tabella[$x+1][$y-2]="$colore";
$tabella[$x-2][$y-1]="$colore";
$tabella[$x-1][$y-1]="$colore";
$tabella[$x][$y-1]="$colore";
$tabella[$x+1][$y-1]="$colore";
$tabella[$x+2][$y-1]="$colore";
$tabella[$x-2][$y]="$colore";
$tabella[$x-1][$y]="$colore";
$tabella[$x][$y]="$colore";
$tabella[$x+1][$y]="$colore";
$tabella[$x+2][$y]="$colore";
$tabella[$x-2][$y+1]="$colore";
$tabella[$x-1][$y+1]="$colore";
$tabella[$x][$y+1]="$colore";
$tabella[$x+1][$y+1]="$colore";
$tabella[$x+2][$y+1]="$colore";
$tabella[$x-1][$y+2]="$colore";
$tabella[$x][$y+2]="$colore";
$tabella[$x+1][$y+2]="$colore";
}
}
function plot() {
global $righe, $colonne, $tabella, $spessore;
echo "<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">";
for ($r=1; $r<=$righe; $r++) {
echo " <tr>";
for ($c=1; $c<=$colonne; $c++) {
echo " <td><img border=\"0\" src=\"img/{$tabella[$c][$r]}.gif\" width=\"$spessore\" height=\"$spessore\"></td>";
}
echo " </tr>";
}
echo "</table>";
}
function clean() {
global $righe, $colonne, $tabella;
for ($r=1; $r<=$righe; $r++) {
for ($c=1; $c<=$colonne; $c++) {
$tabella[$c][$r]="vuoto";
}
}
}
clean();
linea_size1(10,10,70,70,"blu");
linea_size2(10,90,80,20,"verde");
linea_size3(20,60,90,30,"rosso");
plot();
?>
]]>
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