fixed characters drawing orientation and array handling

server.ino

@@ -1,8 +1,21 @@
+#include <WiFi.h>
+#include <WebServer.h>
+#include <ArduinoJson.h>
+
 const char* ssid = "PPIA";
 const char* password = "pawelpdaldonejta";
 
 WebServer server(80);
 
+// Declare the new_image buffer to temporarily store uploaded image
+struct Pixel {
+  unsigned short x;
+  unsigned short y;
+  uint32_t color;
+};
+
+Pixel new_image[16][16];
+
 void handleRoot() {
   server.send(200, "text/html", index_html);
 }
@@ -20,15 +33,27 @@ void handleUpload() {
   for (JsonVariant val : arr) {
     int col = 0;
     for (JsonVariant val2 : val.as<JsonArray>()) {
-      long color = strtol(val2.as<const char*>(), NULL, 16);
+      unsigned long color = strtoul(val2.as<const char*>(), NULL, 16);
       new_image[row][col] = { (unsigned short)col, (unsigned short)row, (uint32_t)color };
       col++;
     }
     row++;
   }
   
+  // Save the new image to the next slot
+  if (saved_images_count < 11) {  // Ensure we don't overflow (max index is 11)
+    saved_images_count++;
+  }
+  
+  // Copy new_image data to saved_imaged array
+  for (int r = 0; r < 16; r++) {
+    for (int c = 0; c < 16; c++) {
+      saved_imaged[saved_images_count][r][c] = new_image[r][c].color;
+    }
+  }
+  
   pixels.clear();
-  drawImageFromArr(0, 0);
+  drawImageFromSaved(0, 0, saved_images_count);
   pixels.show();
   server.send(200, "text/plain", "OK");
 }
@@ -57,4 +82,4 @@ void start_server() {
 
 void handle_server() {
   server.handleClient();
-}
+}