Попытки в стрелочки х2 неудачные, но чуть боле удачные

flutter/lib/curve_painter.dart

@@ -76,15 +76,30 @@ class CurvePainter extends CustomPainter {
     return Graphs.fromList("1", d, false, false);
   }
 
-  Map<int, Offset> getDotPos(int dotsAm, Size size) {
+  int getHighConnections() {
+    int higest = -1;
+    gr.getDots().forEach((element) {
+      if (element.getL().length > higest) {
+        higest = element.num;
+      }
+    });
+    return higest;
+  }
+
+  Map<int, Offset> getDotPos(int dotsAm, Size size, int exclude) {
+    dotsAm--;
     Map<int, Offset> off = <int, Offset>{};
     var width = size.width / 2;
     var height = size.height / 2;
+    int add = 1;
     for (int i = 0; i < dotsAm; i++) {
       double x = cos(2 * pi * i / dotsAm) * circleRad + width;
       double y = sin(2 * pi * i / dotsAm) * circleRad + height;
-      off[i + 1] = Offset(x, y);
+
+      if (i == exclude - 1) add++;
+      off[i + add] = Offset(x, y);
     }
+
     //print(off);
     return off;
   }
@@ -101,11 +116,14 @@ class CurvePainter extends CustomPainter {
       ..strokeJoin = StrokeJoin.round
       ..strokeWidth = width - 1;
 
+    var length = sqrt((to.dx - from.dx) * (to.dx - from.dx) +
+        (to.dy - from.dy) * (to.dy - from.dy));
+
     /// Draw a single arrow.
     path = Path();
     path.moveTo(from.dx, from.dy);
-    path.relativeCubicTo(
-        0, 0, size.width / 20, 50, to.dx - from.dx, to.dy - from.dy);
+    path.relativeCubicTo(0, 0, -(from.dx + to.dx) / length - 40,
+        -(from.dy + to.dy) / length - 40, to.dx - from.dx, to.dy - from.dy);
     path =
         ArrowPath.make(path: path, isDoubleSided: doubleSided, tipLength: 13);
     canvas.drawPath(path, paint);
@@ -123,11 +141,14 @@ class CurvePainter extends CustomPainter {
       ..strokeJoin = StrokeJoin.round
       ..strokeWidth = width - 1;
 
+    var length = sqrt((to.dx - from.dx) * (to.dx - from.dx) +
+        (to.dy - from.dy) * (to.dy - from.dy));
+
     /// Draw a single arrow.
     path = Path();
     path.moveTo(from.dx, from.dy);
-    path.relativeCubicTo(
-        0, 0, -size.width / 25, -50, to.dx - from.dx, to.dy - from.dy);
+    path.relativeCubicTo(0, 0, (from.dx + to.dx) / length + 60,
+        (from.dy + to.dy) / length + 0, to.dx - from.dx, to.dy - from.dy);
     path = ArrowPath.make(
         path: path,
         isDoubleSided: doubleSided,
@@ -151,8 +172,8 @@ class CurvePainter extends CustomPainter {
               if (gr.getUseLengthBool()) {
                 drawDotNames(
                     canvas,
-                    Offset((off[d]!.dx + beg.dx) / 2 - 20,
-                        (off[d]!.dy + beg.dy) / 2 - 20),
+                    Offset((off[d]!.dx + beg.dx) / 2 - 18,
+                        (off[d]!.dy + beg.dy) / 2 - 18),
                     i.getL()[d].toString());
               }
             } else {
@@ -160,8 +181,8 @@ class CurvePainter extends CustomPainter {
               if (gr.getUseLengthBool()) {
                 drawDotNames(
                     canvas,
-                    Offset((off[d]!.dx + beg.dx) / 2 + 25,
-                        (off[d]!.dy + beg.dy) / 2 + 25),
+                    Offset((off[d]!.dx + beg.dx) / 2 + 30,
+                        (off[d]!.dy + beg.dy) / 2 + 30),
                     i.getL()[d].toString());
               }
             }
@@ -191,10 +212,14 @@ class CurvePainter extends CustomPainter {
     //Offset(size.width, size.height / 2));
 
     //gr = getGraph();
-    var off = getDotPos(gr.getDotAmount(), size);
+    int higest = getHighConnections();
+    if (higest > -1) {
+      var off = getDotPos(gr.getDotAmount(), size, higest);
+      off[higest] = Offset(size.width / 2, size.height / 2);
       for (int i in off.keys) {
         drawDot(canvas, off[i]!);
-      drawDotNames(canvas, off[i]!, "${gr.getDots()[i - 1].getName()}:[${i}]");
+        drawDotNames(
+            canvas, off[i]!, "${gr.getDots()[i - 1].getName()}:[${i}]");
       }
       //var g = gr.getNoRepeatDots();
       //print(g);
@@ -204,6 +229,7 @@ class CurvePainter extends CustomPainter {
       //drawArrow(canvas, Offset(size.width / 2, size.height / 2),
       //   Offset(size.width / 2 + 50, size.height / 2 + 200));
     }
+  }
 
   @override
   bool shouldRepaint(CustomPainter oldDelegate) {
@@ -273,9 +299,9 @@ void pringArr(Canvas canvas, Size size) {
   /// Use complex path.
   path = Path();
   path.moveTo(size.width * 0.25, size.height * 0.3);
-  path.relativeCubicTo(0, 0, size.width * 0.25, 50, size.width * 0.5, 50);
-  path.relativeCubicTo(0, 0, -size.width * 0.25, 0, -size.width * 0.5, 50);
-  path.relativeCubicTo(0, 0, size.width * 0.125, 10, size.width * 0.25, -10);
+  path.relativeCubicTo(0, 0, size.width * 0.25, 0, size.width * 0.5, 50);
+  path.relativeCubicTo(0, 0, -size.width * 0.25, 50, -size.width * 0.5, 50);
+  //path.relativeCubicTo(0, 0, size.width * 0.125, 10, size.width * 0.25, -10);
   path = ArrowPath.make(path: path, isDoubleSided: true);
   canvas.drawPath(path, paint..color = Colors.blue);
 

flutter/lib/pages/drawing_page.dart

@@ -11,7 +11,7 @@ Graphs getGraph() {
   d.add(Dot.fromTwoLists("3", [1, 2], [1, 2]));
   d.add(Dot.fromTwoLists("Name1", [], []));
   d.add(Dot.fromTwoLists("Name2", [], []));
-  return Graphs.fromList("1", d, true, false);
+  return Graphs.fromList("1", d, true, true);
 }
 
 class DrawingPage extends StatefulWidget {

flutter/outTest.txt

@@ -0,0 +1,11 @@
+1
+Ориентированный
+Взвешенный
+1: 2|5 5|4 
+2: 
+3: 5|4 
+4: 6|5 
+5: 2|4 
+6: 5|4 2|5 1|5 
+7: 2|5 
+END