add support for Apple Pencil and build for iOS

engine/app.cpp

@@ -4,6 +4,10 @@
 #include "node_icon.h"
 #include "node_dialog_open.h"
 
+#ifdef __APPLE__
+#include <Foundation/Foundation.h>
+#endif
+
 using namespace ui;
 
 App App::I; // singleton
@@ -84,7 +88,13 @@ void App::init()
 
     LOG("Screen Resolution: %dx%d", (int)width, (int)height);
 
-    zoom = ceilf(width / 1000.f);
+    zoom = ceilf(width / 2000.f);
+    
+#ifdef __IOS__
+    NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
+    NSString* docpath = [paths objectAtIndex:0];
+    data_path = [docpath cStringUsingEncoding:NSASCIIStringEncoding];
+#endif
 
     glDisable(GL_DEPTH_TEST);
 #if defined(_WIN32) || defined(__OSX__)