LazNodeEditor (visual node graph editor component )

[avra]

Very useful, thanks! 

[Curt Carpenter]

This looks very useful and well done.  Could you point me to some literature that describes the uses of "node graphs" generally? 

[CynicRus]

Well, a lot has changed over the past week:
 

• Implemented a fast and cross-platform OpenGL 3.3 canvas (10x performance gain over GDI on complex graphs).
• Optimized rendering.
• Conducted a major refactoring, making the codebase much easier to navigate.
• Implemented spatial indexes to optimize the search for graph nodes and edges.
• Implemented new line types and many other interesting features, such as auto-layout of the graph into a grid.

To enable OpenGL, use the editor's antialiasing property. Please note that the lazopenglcontext package is now required as a dependency.

[simsee]

I cloned the repository to a local folder and tried to build with Lazarus 4.6, getting the following errors:

Code: Pascal  [Select][+][-]

1. Compile Project, Target: C:\Users\simon\Desktop\LazNodeEditor-main\demo\NodeEdDemo.exe: Exit code 1, Errors: 18, Hints: 13
2. genericdag.pas(256,11) Error: Identifier not found "EListError"
3. genericdag.pas(262,11) Error: Identifier not found "EListError"
4. genericdag.pas(296,11) Error: Identifier not found "EListError"
5. genericdag.pas(459,11) Error: Identifier not found "EListError"
6. genericdag.pas(463,11) Error: Identifier not found "EListError"
7. genericdag.pas(485,11) Error: Identifier not found "EListError"
8. genericdag.pas(492,11) Error: Identifier not found "EListError"
9. genericdag.pas(542,21) Hint: Local variable "NewEdges" of a managed type does not seem to be initialized
10. genericdag.pas(571,21) Hint: Local variable "OldToNew" of a managed type does not seem to be initialized
11. genericdag.pas(596,21) Hint: Local variable "OldItems" of a managed type does not seem to be initialized
12. genericdag.pas(597,21) Hint: Local variable "OldToNew" of a managed type does not seem to be initialized
13. genericdag.pas(627,21) Hint: Local variable "OldToNew" of a managed type does not seem to be initialized
14. genericdag.pas(628,21) Hint: Local variable "OldItems" of a managed type does not seem to be initialized
15. genericdag.pas(644,11) Error: Identifier not found "EListError"
16. genericdag.pas(687,11) Error: Identifier not found "EListError"
17. genericdag.pas(691,16) Hint: Local variable "Idx" of a managed type does not seem to be initialized
18. genericdag.pas(692,21) Hint: Local variable "NewItems" of a managed type does not seem to be initialized
19. genericdag.pas(693,21) Hint: Local variable "OldToNew" of a managed type does not seem to be initialized
20. genericdag.pas(730,11) Error: Identifier not found "EListError"
21. genericdag.pas(740,11) Error: Identifier not found "EListError"
22. genericdag.pas(742,11) Error: Identifier not found "EListError"
23. genericdag.pas(751,11) Error: Identifier not found "EListError"
24. genericdag.pas(755,11) Error: Identifier not found "EListError"
25. genericdag.pas(806,18) Hint: Local variable "Stack" of a managed type does not seem to be initialized
26. genericdag.pas(807,20) Hint: Local variable "Visited" of a managed type does not seem to be initialized
27. genericdag.pas(866,11) Error: Identifier not found "EListError"
28. genericdag.pas(875,11) Error: Identifier not found "EListError"
29. genericdag.pas(877,11) Error: Identifier not found "EListError"
30. genericdag.pas(902,20) Hint: Local variable "InDeg" of a managed type does not seem to be initialized
31. genericdag.pas(903,20) Hint: Local variable "Queue" of a managed type does not seem to be initialized
32. genericdag.pas(940,13) Error: Identifier not found "EListError"
33.  

[wp]

Switched to my IDE based on Laz/main + FPC/main and found that most of these errors are gone, but 'LazNodeEditor.GraphCommands.pas(1319,11) Error: Identifier idents no member "LoadFromJSONText" ' is still there. CynicRus, did you forget to commit and/or push your most recent changes?

OpenGLContext and the associated units gl*contgext are missing as well (or you must add a requirement for LazOpenGLControl).

[CynicRus]

Switched to my IDE based on Laz/main + FPC/main and found that most of these errors are gone, but 'LazNodeEditor.GraphCommands.pas(1319,11) Error: Identifier idents no member "LoadFromJSONText" ' is still there. CynicRus, did you forget to commit and/or push your most recent changes?

OpenGLContext and the associated units gl*contgext are missing as well (or you must add a requirement for LazOpenGLControl).

Oops, sorry, I missed one file when uploading. I've fixed it.

[CynicRus]

I cloned the repository to a local folder and tried to build with Lazarus 4.6, getting the following errors:

Code: Pascal  [Select][+][-]

1. Compile Project, Target: C:\Users\simon\Desktop\LazNodeEditor-main\demo\NodeEdDemo.exe: Exit code 1, Errors: 18, Hints: 13
2. genericdag.pas(256,11) Error: Identifier not found "EListError"
3. genericdag.pas(262,11) Error: Identifier not found "EListError"
4. genericdag.pas(296,11) Error: Identifier not found "EListError"
5. genericdag.pas(459,11) Error: Identifier not found "EListError"
6. genericdag.pas(463,11) Error: Identifier not found "EListError"
7. genericdag.pas(485,11) Error: Identifier not found "EListError"
8. genericdag.pas(492,11) Error: Identifier not found "EListError"
9. genericdag.pas(542,21) Hint: Local variable "NewEdges" of a managed type does not seem to be initialized
10. genericdag.pas(571,21) Hint: Local variable "OldToNew" of a managed type does not seem to be initialized
11. genericdag.pas(596,21) Hint: Local variable "OldItems" of a managed type does not seem to be initialized
12. genericdag.pas(597,21) Hint: Local variable "OldToNew" of a managed type does not seem to be initialized
13. genericdag.pas(627,21) Hint: Local variable "OldToNew" of a managed type does not seem to be initialized
14. genericdag.pas(628,21) Hint: Local variable "OldItems" of a managed type does not seem to be initialized
15. genericdag.pas(644,11) Error: Identifier not found "EListError"
16. genericdag.pas(687,11) Error: Identifier not found "EListError"
17. genericdag.pas(691,16) Hint: Local variable "Idx" of a managed type does not seem to be initialized
18. genericdag.pas(692,21) Hint: Local variable "NewItems" of a managed type does not seem to be initialized
19. genericdag.pas(693,21) Hint: Local variable "OldToNew" of a managed type does not seem to be initialized
20. genericdag.pas(730,11) Error: Identifier not found "EListError"
21. genericdag.pas(740,11) Error: Identifier not found "EListError"
22. genericdag.pas(742,11) Error: Identifier not found "EListError"
23. genericdag.pas(751,11) Error: Identifier not found "EListError"
24. genericdag.pas(755,11) Error: Identifier not found "EListError"
25. genericdag.pas(806,18) Hint: Local variable "Stack" of a managed type does not seem to be initialized
26. genericdag.pas(807,20) Hint: Local variable "Visited" of a managed type does not seem to be initialized
27. genericdag.pas(866,11) Error: Identifier not found "EListError"
28. genericdag.pas(875,11) Error: Identifier not found "EListError"
29. genericdag.pas(877,11) Error: Identifier not found "EListError"
30. genericdag.pas(902,20) Hint: Local variable "InDeg" of a managed type does not seem to be initialized
31. genericdag.pas(903,20) Hint: Local variable "Queue" of a managed type does not seem to be initialized
32. genericdag.pas(940,13) Error: Identifier not found "EListError"
33.  

EListError = Class(Exception); - It should be in sysutils.

[simsee]

With the current version, the compiler now does not find the PointF and RectF functions in the LazNodeEditor.LinkRouter unit.

[Dzandaa]

Hi,

With the current version, the compiler now does not find the PointF and RectF functions in the LazNodeEditor.LinkRouter unit.

Same for me with version 3.8 fpc 3.2.2

B->

[wp]

You need FPC/main to compile this project... IMHO it is not a good idea to write an application based on FPC/main because most users will be excluded from the work.

[CynicRus]

With the current version, the compiler now does not find the PointF and RectF functions in the LazNodeEditor.LinkRouter unit.

Hi,

With the current version, the compiler now does not find the PointF and RectF functions in the LazNodeEditor.LinkRouter unit.

Same for me with version 3.8 fpc 3.2.2

B->

Thank you, fixed now for the stable compiler.

[wp]

Did you test compilation with FPC 3.2.2? There are still lots of issues which the compiler does not accept.

[simsee]

Unfortunately I'm encountering a couple of problems:

Code: Pascal  [Select][+][-]

1. LazNodeEditor.GraphCommands.pas(130,15) Error: Identifier not found "TStringList"

Adding the Classes unit to fix the problem causes another error:

Code: Pascal  [Select][+][-]

1. LazNodeEditor.SpatialIndex.pas(122,13) Error: Identifier not found "RectF"

[CynicRus]

Did you test compilation with FPC 3.2.2? There are still lots of issues which the compiler does not accept.

Yep. Just commited fixes via the web version of GitHub by copy/paste)

[CynicRus]

Unfortunately I'm encountering a couple of problems:

Code: Pascal  [Select][+][-]

1. LazNodeEditor.GraphCommands.pas(130,15) Error: Identifier not found "TStringList"

Adding the Classes unit to fix the problem causes another error:

Code: Pascal  [Select][+][-]

1. LazNodeEditor.SpatialIndex.pas(122,13) Error: Identifier not found "RectF"

Fixed, ty. RectF function for the stable compiler in the LazNodeEditor.Types.pas