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Automatic arrangement of nodes in VisualScript/VisualShaders editors

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This PR and commit adds the functionality to arrange nodes in VisualScript/VisualShader editor. The layout generated by this 
feature is compact, with minimum crossings between connections
& uniform horizontal & vertical gaps between the nodes. 

This work has been sponsored by GSoC '21.

Full list of additions/changes:
• Added arrange_nodes() method in GraphEdit module.
    • This method computes new positions for all the selected
      nodes by forming blocks and compressing them.
      The nodes are moved to these new positions. 
    • Adding this method to GraphEdit makes it available for 
      use in VisualScript/VisualShaders editors and its other
      subclasses. 
• Button with an icon has been added to call arrange_nodes() in GraphEdit. 
    • This button is inherited by VisualScript/VisualShaders editors
       to invoke the method.
• Undo/redo is functional with this method.
    • By using signals in arrange_nodes(), position changes are registered 
       in undo/redo stack of the subclass that is using the method. 
• Metadata of the method has been updated in ClassDB
• Method description has been added to class reference of GraphEdit
This commit is contained in:
Umang Kalra
2021-08-11 00:44:19 +05:30
parent da339f8ffc
commit 12fc3f1eef
9 changed files with 542 additions and 1 deletions
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1
editor/editor_themes.cpp
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@@ -1232,6 +1232,7 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
theme->set_icon("reset", "GraphEdit", theme->get_icon("ZoomReset", "EditorIcons"));
theme->set_icon("snap", "GraphEdit", theme->get_icon("SnapGrid", "EditorIcons"));
theme->set_icon("minimap", "GraphEdit", theme->get_icon("GridMinimap", "EditorIcons"));
theme->set_icon("layout", "GraphEdit", theme->get_icon("GridLayout", "EditorIcons"));
theme->set_constant("bezier_len_pos", "GraphEdit", 80 * EDSCALE);
theme->set_constant("bezier_len_neg", "GraphEdit", 160 * EDSCALE);