1 files changed, 46 insertions, 0 deletions
diff --git a/php/chart.php b/php/chart.php
new file mode 100644
index 0000000..bab5ce9
--- /dev/null
+++ b/php/chart.php
@@ -0,0 +1,46 @@
+<?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++;
+  }
+}