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<?php
function drawChart(GdImage $img): void
{
global $X_DATA, $Y_DATA;
require "consts.php";
$xx = [];
for ($x = $HOR_SPACE + $LINES->hor->x1; $x <= $LINES->hor->x2 + 1; $x += $HOR_SPACE) {
array_push($xx, $x);
}
$yy = [];
for ($y = $LINES->ver->y2 - $VER_SPACE; $y >= $LINES->ver->y1 - 1; $y -= $VER_SPACE) {
array_push($yy, $y);
}
$i = 0;
$ox = -1;
$oy = -1;
foreach ($X_DATA as $xd) {
$x = $xx[$i];
if ($xd === NULL) {
imagefilledellipse($img, $x, $yy[0] + $VER_SPACE, 7, 7, $COLOR->grey);
$ox = -1;
$oy = -1;
} elseif ($xd < 0) {
imagefilledellipse($img, $x, $yy[0] + $VER_SPACE, 7, 7, $COLOR->red);
$ox = -1;
$oy = -1;
} else {
$close_to = (($xd * 10 - $Y_DATA[0] * 10) / 10) / (($Y_DATA[1] * 10 - $Y_DATA[0] * 10) / 10) * $VER_SPACE;
$y = ($yy[0] * 10 - $close_to * 10) / 10;
imagefilledellipse($img, $x, $y, 7, 7, $COLOR->blue);
if ($ox >= 0)
imageline($img, $ox, $oy, $x, $y, $COLOR->blue);
$ox = $x;
$oy = $y;
}
$i++;
}
}
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