Change encoding

And add fix button

Canvas.cpp

@@ -1,4 +1,4 @@
-#include "Canvas.h"
+#include "Canvas.h"
 
 static double dist_P2P(QPointF p1, QPointF p2) {
 	return sqrt(pow(p2.x() - p1.x(), 2) + pow(p2.y() - p1.y(), 2));