feat: Transform Editor toolbox plugin — PJ3 Custom Series port

Ports PlotJuggler 3's Custom Series / Function Editor as a data-only toolbox
plugin. The UI mirrors PJ3: a Single Function tab (drag-drop source, additional
sources with a primary-source radio in the first column, function body), a Batch
Functions tab, and a function library — an interactive browser sub-panel and
Import / Export of the library to a JSON file.

Data-only: the plugin never runs a script itself. On Save it hands the host a
self-describing Luau class (N inputs -> M outputs) via `pj.data_processors.v1`,
run live as a DerivedEngine node; the live preview is produced host-side too
(ephemeral transform + validate). There is no local Lua engine in the plugin.

Requires plotjuggler_sdk 0.14.0 — the data-processor script API, the interactive
sub-panel + table radio-column dialog additions (#136), and the save-file picker
used by the library Export (#138). The extern/plotjuggler_core submodule is
pinned to an SDK build carrying both.

Contents:
- transform_editor_plugin.cpp — dialog + toolbox: drag-drop, primary-source radio,
  function library browser, Import/Export, host-side preview, name-prompt +
  overwrite on Save, createTransform on Save.
- transform_editor_dialog.ui — PJ3-style UI.
- manifest.json / CMakeLists.txt / conanfile.py — registration; SDK 0.14.0.

Pairs with the host side: PlotJuggler/PJ4#252.

Author: pabloinigoblasco

CMakeLists.txt

@@ -49,6 +49,7 @@ if(TARGET plotjuggler_sdk::plugin_sdk)
   add_subdirectory(toolbox_quaternion)
   add_subdirectory(toolbox_reactive_scripts_editor)
   add_subdirectory(toolbox_mosaico)
+  add_subdirectory(toolbox_transform_editor)
   return()
 endif()
 

SDK_VERSION

@@ -1 +1 @@
-0.11.0
+0.14.0

extern/plotjuggler_core

@@ -0,0 +1,41 @@
+find_package(nlohmann_json REQUIRED)
+
+include(${CMAKE_CURRENT_LIST_DIR}/../cmake/EmbedUi.cmake)
+include(${CMAKE_CURRENT_LIST_DIR}/../cmake/EmbedManifest.cmake)
+
+add_library(toolbox_transform_editor_plugin SHARED transform_editor_plugin.cpp)
+
+target_compile_features(toolbox_transform_editor_plugin PRIVATE cxx_std_20)
+target_compile_options(toolbox_transform_editor_plugin PRIVATE ${PJ_WARNING_FLAGS})
+
+target_link_libraries(toolbox_transform_editor_plugin PRIVATE
+  plotjuggler_sdk::plugin_sdk
+  nlohmann_json::nlohmann_json
+)
+
+# When built as part of the PJ4 app (not standalone), link pj_dialog_engine_qt
+# to get access to ChartPreviewWidget for the live preview chart.
+if(TARGET pj_dialog_engine_qt)
+  target_link_libraries(toolbox_transform_editor_plugin PRIVATE pj_dialog_engine_qt)
+  target_compile_definitions(toolbox_transform_editor_plugin PRIVATE PJ_HAS_CHART_PREVIEW=1)
+endif()
+
+target_include_directories(toolbox_transform_editor_plugin PRIVATE
+  ${CMAKE_CURRENT_BINARY_DIR}/generated
+)
+
+pj_embed_ui(toolbox_transform_editor_plugin
+  UI_FILE  ${CMAKE_CURRENT_SOURCE_DIR}/transform_editor_dialog.ui
+  HEADER   ${CMAKE_CURRENT_BINARY_DIR}/generated/transform_editor_dialog_ui.hpp
+  VAR_NAME kTransformEditorDialogUi
+)
+
+pj_embed_manifest(toolbox_transform_editor_plugin
+  HEADER   ${CMAKE_CURRENT_BINARY_DIR}/generated/transform_editor_manifest.hpp
+  VAR_NAME kTransformEditorManifest
+)
+
+pj_emit_plugin_manifest(toolbox_transform_editor_plugin
+  FAMILY        toolbox
+  MANIFEST_FILE ${CMAKE_CURRENT_SOURCE_DIR}/manifest.json
+)

toolbox_transform_editor/CMakeLists.txt

@@ -0,0 +1,22 @@
+import os
+from conan import ConanFile
+
+
+_SDK_VERSION = (
+    open(os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, "SDK_VERSION"))
+    .read()
+    .strip()
+)
+
+
+class ToolboxTransformEditorConan(ConanFile):
+    name = "toolbox_transform_editor"
+    version = "0"
+    settings = "os", "compiler", "build_type", "arch"
+    generators = "CMakeDeps", "CMakeToolchain"
+    requires = (
+        f"plotjuggler_sdk/{_SDK_VERSION}",
+        "gtest/1.17.0",
+        "nlohmann_json/3.12.0",
+    )
+    default_options = {"*:shared": False}

toolbox_transform_editor/conanfile.py

@@ -0,0 +1,22 @@
+{
+  "id": "toolbox-transform-editor",
+  "name": "Transform Editor",
+  "version": "1.0.0",
+  "description": "Create named derived time series using Lua functions. Equivalent to the Custom Series editor in PJ3.",
+  "author": "PlotJuggler Team",
+  "publisher": "PlotJuggler",
+  "website": "https://github.com/PlotJuggler/pj-official-plugins",
+  "repository": "https://github.com/PlotJuggler/pj-official-plugins",
+  "license": "MIT",
+  "icon_url": "",
+  "category": "toolbox",
+  "tags": [
+    "lua",
+    "transform",
+    "derived",
+    "custom",
+    "toolbox",
+    "hidden"
+  ],
+  "min_plotjuggler_version": "4.0.0"
+}