diff --git a/svg-demo/demo.yml b/svg-demo/demo.yml
new file mode 100644
index 0000000..a49806c
--- /dev/null
+++ b/svg-demo/demo.yml
@@ -0,0 +1,172 @@
+layer:
+- ["603EDF5CAFFF5E2"] # layer 0
+- ["61BEC75CAFFF5E2","0C3EDF5CAFFF5E2"] # layer 1
+- ["0DBEC75CAFFF5E2","EC34DF1CAFFF5E2"] # layer 2
+- ["EDB4C71CAFFF5E2","EC34DFE42FFF5E2"] # layer 3
+- ["EDB4C7E42FFF5E2"] # layer 4
+- ["EDB4F8E50FFF5E2"] # layer 5
+- ["ED84FBE50FFF5E2"] # layer 6
+- ["EC34FBE50FFF5E2"] # layer 7
+- ["EFB4D3E40FFF5E2"] # layer 8
+- ["EFB4D3039FFF5E2"] # layer 9
+- ["EFB413639FFF5E2"] # layer 10
+- ["E3B4136F9FFF5E2"] # layer 11
+- ["FC34836F9FFF5E2"] # layer 12
+- ["FDB4806F9FFF5E2"] # layer 13
+- ["FDB4B96C0FFF5E2"] # layer 14
+- ["FDB4B9603FFF5E2"] # layer 15
+- ["FDB4B901BFFF5E2"] # layer 16
+- ["E1B5F909BFFF5E2","1DBEB941BFFF5E2"] # layer 17
+- ["01BFF949BFFF5E2"] # layer 18
+- ["603FF949BFFF5E2"] # layer 19
+- ["6C0FF949BFFF5E2"] # layer 20
+- ["6F9FC049BFFF5E2"] # layer 21
+- ["6F9FC3483FFF5E2"] # layer 22
+- ["6F9E3B413FFF5E2"] # layer 23
+- ["6F91FB093FFF5E2"] # layer 24
+- ["6F9FFB4931FF1E2"] # layer 25
+- ["6F9FFB493FC7F02"] # layer 26
+- ["6F9FFB493FF8F10"] # layer 27
+- ["6F9FFB490FF8F13"] # layer 28
+- ["6F9FF8490FFBF13"] # layer 29
+- ["6F9FC7482FFBF13"] # layer 30
+- ["6F9FFF492FC3F03"] # layer 31
+- ["6F9FFF4921FB1E3"] # layer 32
+- ["6F91FF092FFB5E3"] # layer 33
+- ["6F9E3F412FFB5E3"] # layer 34
+- ["639E3F4D2FFB5E3"] # layer 35
+- ["039EFF4D2FFB5E3"] # layer 36
+- ["E40EFF4D2FFB5E3"] # layer 37
+- ["E47EFA4D0FFB5E3","E78ED74C2FFB5E3"] # layer 38
+- ["E7FED24C0FFB5E3"] # layer 39
+- ["E7FED2403FFB5E3"] # layer 40
+- ["E7FED25FBFE3403"] # layer 41
+- ["E7FED25FBFE34C0"] # layer 42
+- ["E7FED25FBFE04D8"] # layer 43
+- ["E7FED25F8FE04DB"] # layer 44
+- ["E78ED05FFFE24DB"] # layer 45
+- ["E47EC25FFFE24DB"] # layer 46
+- ["E5FE025FFFE24DB"] # layer 47
+- ["E5FFFA5E7E024DB"] # layer 48
+- ["E5FFFA5E7E1A41B"] # layer 49
+- ["E5FFFA5E71DA09B"] # layer 50
+- ["E5F1FA1E7FDA49B"] # layer 51
+- ["E5FFC2F07FDA49B"] # layer 52
+- ["E5FFC2F1FFC249B"] # layer 53
+- ["E5FFC2F1FFDA483"] # layer 54
+- ["E5FFC2F1FFDA498"] # layer 55
+- ["E5FFC2F18FDF49A"] # layer 56
+- ["E58FC7F1AFDF49A"] # layer 57
+- ["E43FC7F1AFDF49A"] # layer 58
+- ["E5BFC7F02FDF49A"] # layer 59
+- ["E5B1FF1E2FDF49A"] # layer 60
+- ["E5BFFF5E21DF09A"] # layer 61
+- ["E5BFFF5E2E1F41A"] # layer 62
+- ["E5BFFF5E2E1F4C2","E5BFFF5E2EDF402"] # layer 63
+- ["E5BFFF5E2EC74C2"] # layer 64
+- ["E5BFFF5E2EF84D0"] # layer 65
+- ["E5BFF85E0EFF4D2"] # layer 66
+- ["E5BE3F43CEFF4D2"] # layer 67
+- ["E5BEFF43CE3F4D2"] # layer 68
+- ["E5BEFF4FCE3F412"] # layer 69
+- ["E5BEFF4FC1FF092"] # layer 70
+- ["E5B0FF0FCFFF492"] # layer 71
+- ["E5B03F6FCFFF492"] # layer 72
+- ["01BE7F6FCFFF492"] # layer 73
+- ["603E7F6FCFFF492"] # layer 74
+- ["6C0E7F6FCFFF492"] # layer 75
+- ["6FFE7C6C0FFF492"] # layer 76
+- ["6FFE7C603FFF492"] # layer 77
+- ["6FFE7C01BFFF492"] # layer 78
+- ["6FF03CE5BFFF492"] # layer 79
+- ["63F63CE5BFFF492"] # layer 80
+- ["7F87E0E5BFFF492"] # layer 81
+
+next:
+- - [0,1] # (0, 0) -> 1
+- - [0] # (1, 0) -> 2
+  - [0,1] # (1, 1) -> 2
+- - [0] # (2, 0) -> 3
+  - [0,1] # (2, 1) -> 3
+- - [0] # (3, 0) -> 4
+  - [0] # (3, 1) -> 4
+- - [0] # (4, 0) -> 5
+- - [0] # (5, 0) -> 6
+- - [0] # (6, 0) -> 7
+- - [0] # (7, 0) -> 8
+- - [0] # (8, 0) -> 9
+- - [0] # (9, 0) -> 10
+- - [0] # (10, 0) -> 11
+- - [0] # (11, 0) -> 12
+- - [0] # (12, 0) -> 13
+- - [0] # (13, 0) -> 14
+- - [0] # (14, 0) -> 15
+- - [0] # (15, 0) -> 16
+- - [0,1] # (16, 0) -> 17
+- - [0] # (17, 0) -> 18
+  - [0] # (17, 1) -> 18
+- - [0] # (18, 0) -> 19
+- - [0] # (19, 0) -> 20
+- - [0] # (20, 0) -> 21
+- - [0] # (21, 0) -> 22
+- - [0] # (22, 0) -> 23
+- - [0] # (23, 0) -> 24
+- - [0] # (24, 0) -> 25
+- - [0] # (25, 0) -> 26
+- - [0] # (26, 0) -> 27
+- - [0] # (27, 0) -> 28
+- - [0] # (28, 0) -> 29
+- - [0] # (29, 0) -> 30
+- - [0] # (30, 0) -> 31
+- - [0] # (31, 0) -> 32
+- - [0] # (32, 0) -> 33
+- - [0] # (33, 0) -> 34
+- - [0] # (34, 0) -> 35
+- - [0] # (35, 0) -> 36
+- - [0] # (36, 0) -> 37
+- - [0,1] # (37, 0) -> 38
+- - [0] # (38, 0) -> 39
+  - [0] # (38, 1) -> 39
+- - [0] # (39, 0) -> 40
+- - [0] # (40, 0) -> 41
+- - [0] # (41, 0) -> 42
+- - [0] # (42, 0) -> 43
+- - [0] # (43, 0) -> 44
+- - [0] # (44, 0) -> 45
+- - [0] # (45, 0) -> 46
+- - [0] # (46, 0) -> 47
+- - [0] # (47, 0) -> 48
+- - [0] # (48, 0) -> 49
+- - [0] # (49, 0) -> 50
+- - [0] # (50, 0) -> 51
+- - [0] # (51, 0) -> 52
+- - [0] # (52, 0) -> 53
+- - [0] # (53, 0) -> 54
+- - [0] # (54, 0) -> 55
+- - [0] # (55, 0) -> 56
+- - [0] # (56, 0) -> 57
+- - [0] # (57, 0) -> 58
+- - [0] # (58, 0) -> 59
+- - [0] # (59, 0) -> 60
+- - [0] # (60, 0) -> 61
+- - [0] # (61, 0) -> 62
+- - [0,1] # (62, 0) -> 63
+- - [0] # (63, 0) -> 64
+  - [0] # (63, 1) -> 64
+- - [0] # (64, 0) -> 65
+- - [0] # (65, 0) -> 66
+- - [0] # (66, 0) -> 67
+- - [0] # (67, 0) -> 68
+- - [0] # (68, 0) -> 69
+- - [0] # (69, 0) -> 70
+- - [0] # (70, 0) -> 71
+- - [0] # (71, 0) -> 72
+- - [0] # (72, 0) -> 73
+- - [0] # (73, 0) -> 74
+- - [0] # (74, 0) -> 75
+- - [0] # (75, 0) -> 76
+- - [0] # (76, 0) -> 77
+- - [0] # (77, 0) -> 78
+- - [0] # (78, 0) -> 79
+- - [0] # (79, 0) -> 80
+- - [0] # (80, 0) -> 81
diff --git a/svg-demo/svg_dump.py b/svg-demo/svg_dump.py
index 46392c5..1445e69 100755
--- a/svg-demo/svg_dump.py
+++ b/svg-demo/svg_dump.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+import yaml
+
 CASE_WIDTH = 48
 CASE_HEIGHT = 72
 
@@ -12,36 +14,39 @@ MAIN_MARGIN_Y = 8
 
 LINK_OFFSET = 1
 
-layer = [
-    ["603EDF5CAFFF5E2"], # layer 0
-    ["61BEC75CAFFF5E2","0C3EDF5CAFFF5E2"], # layer 1
-    ["0DBEC75CAFFF5E2","EC34DF1CAFFF5E2"], # layer 2
-    ["EDB4C71CAFFF5E2","EC34DFE42FFF5E2"], # layer 3
-    ["EDB4C7E42FFF5E2"], # layer 4
-    ["EDB4F8E50FFF5E2"], # layer 5
-]
-
-link = [[
-    [0, 1] # (0, 0) -> 1
-], [
-    [0], # (1, 0) -> 2
-    [0, 1] # (1, 1) -> 2
-], [
-    [0], # (2, 0) -> 3
-    [0, 1], # (2, 1) -> 3
-], [
-    [0], # (3, 0) -> 4
-    [0], # (3, 1) -> 4
-], [
-    [0], # (4, 0) -> 5
-]]
+# layer = [
+#     ["603EDF5CAFFF5E2"], # layer 0
+#     ["61BEC75CAFFF5E2","0C3EDF5CAFFF5E2"], # layer 1
+#     ["0DBEC75CAFFF5E2","EC34DF1CAFFF5E2"], # layer 2
+#     ["EDB4C71CAFFF5E2","EC34DFE42FFF5E2"], # layer 3
+#     ["EDB4C7E42FFF5E2"], # layer 4
+#     ["EDB4F8E50FFF5E2"], # layer 5
+# ]
+#
+# link = [[
+#     [0, 1] # (0, 0) -> 1
+# ], [
+#     [0], # (1, 0) -> 2
+#     [0, 1] # (1, 1) -> 2
+# ], [
+#     [0], # (2, 0) -> 3
+#     [0, 1], # (2, 1) -> 3
+# ], [
+#     [0], # (3, 0) -> 4
+#     [0], # (3, 1) -> 4
+# ], [
+#     [0], # (4, 0) -> 5
+# ]]
+
+raw_data = yaml.load(open('demo.yml').read(), Loader = yaml.FullLoader)
+layer = raw_data['layer']
+link = raw_data['next']
 
 # print(layer)
 # print(link)
 
-MAX_CASE_X = 2
-MAX_CASE_Y = 6
-
+MAX_CASE_X = max([len(x)for x in layer])
+MAX_CASE_Y = len(layer)
 
 # def cal_length(num: int, single_length: int, distance: int):
 #     return num * single_length + (num - 1) * distance