changes for 7.9.0 release

Author: linev

changes.md

@@ -1,41 +1,50 @@
 # JSROOT changelog
 
-## Changes in dev
-1. Implement 'nmatch' parameter for `TTree::Draw` to limit processed events
-1. Implement 'elist' parameter for `TTree::Draw` to specify entries list for processing
-1. Implement 'staged' algorithm for `TTree::Draw` to first select entries and then process only these entries
-1. Implement 'cont5' draw option for `TGraph2D` using Delaunay algorithm
-1. Implement 'pol' and 'arr_colz' draw option for `TH2`
-1. Only 'col7' draw option uses bar offset and width for color `TH2` drawing
-1. Interactive zooming and context menu on 'chord' `TH2` drawing
-1. Implement 'box1' for `TH3` with negative bins
-1. Introduce `settings.FilesTimeout` to configure global timeout for file reading operations
-1. Introduce `settings.FilesRemap` to let provide fallback address for http server, used for `root.cern`
-1. Introduce `settings.TreeReadBunchSize` to configure bunch read size for `TTree` processing
-1. Adjust histogram title drawing with native implementation
-1. Improve float to string conversion when 'g' is specified
-1. Support 'same' option for first histogram, draw directly on pad
-1. Display underflow/overflow bins when configured for the axis, implement 'allbins' draw option for histograms
-1. Support different angle coordinates in `TGraphPolargram`, handle 'N' and 'O' draw options
-1. Support fAxisAngle in `TGraphPolargram`, provide 'rangleNN' draw option
-1. Implement 'arc' draw option for `TPave`
-1. Provide context menus for all derived from `TPave` classes
-1. Let edit histograms and graphs title via context menu
-1. Support Poisson errors for `TH1`/`TH2`, https://root-forum.cern.ch/t/62335/
-1. Test fSumw2 when detect empty `TH2` bin, sync with https://github.com/root-project/root/pull/17948
-1. Support `TLink` and `TButton` object, used in `TInspectCanvas`
-1. Support `TF12` - projection of `TF2`
-1. Upgrade three.js r168 -> r174
-1. Remove support of qt5 webengine, only qt6web can be used
-1. Set 'user-select: none' style in drawings to exclude text selection, using `settings.UserSelect` value
-1. Internals - use private members and methods
-1. Internals - use `WeakRef` class for cross-referencing of painters
-1. Internals - use negative indexes in arrays and Strings
-1. Fix - handle `TPave` NDC position also when fInit is not set
-1. Fix - properly handle image sizes in svg2pdf
-1. Fix - drawing `TPaveText` with zero text size
-1. Fix - correct axis range in `TScatter` drawing
-1. Fix - use draw option also for graph drawing in `TTree::Draw`
+## Changes in 7.9.0
+1. New draw options:
+   - 'pol' and 'arr_colz' draw option for `TH2`
+   - 'col7' uses bar offset and width for `TH2`
+   - 'cont5' for `TGraph2D` using Delaunay algorithm
+   - 'chord' drawiong of `TH2` implements zooming
+   - 'box1' for `TH3` with negative bins
+   - 'same' option for first histogram on pad, draw without creating `TFrame`
+   - 'rangleNN' for `TGraphPolargram`, also support fAxisAngle member
+   - 'N' and 'O' for `TGraphPolargram` for angle coordiante systems
+   - 'arc' for `TPave` and derived classes
+   - 'allbins' for histograms to display underflow/overflow bins
+   - Poisson errors for `TH1`/`TH2`, https://root-forum.cern.ch/t/62335/
+   - test fSumw2 when detect empty `TH2` bin, sync with https://github.com/root-project/root/pull/17948
+2. New supported classes:
+   - `TF12` - projection of `TF2`
+   - `TLink` and `TButton`, used in `TInspectCanvas`
+3. New partameters in `TTree::Draw`:
+   - '>>elist' to request enries matching cut conditions
+   - 'elist' to specify entries for processing
+   - 'nmatch' to process exactly the specified number of entries, break processing afterwards
+   - 'staged' algorithm to first select entries and then process only these entries
+4. New settings parameters:
+   - `settings.FilesTimeout` global timeout for file reading operations
+   - `settings.FilesRemap` fallback address for http server, used for `root.cern`
+   - `settings.TreeReadBunchSize` bunch read size for `TTree` processing
+   - `settings.UserSelect` to set 'user-select: none' style in drawings to exclude text selection
+5. Context menus:
+   - all `TPave`-derived classes
+   - in 'chord' drawings of `TH2`
+   - editing histogram and graph title
+6. Fixes:
+   - match histogram title drawing with native ROOT implementation
+   - float to string conversion when 'g' is specified
+   - handle `TPave` NDC position also when fInit is not set
+   - properly handle image sizes in svg2pdf
+   - drawing `TPaveText` with zero text size
+   - correct axis range in `TScatter` drawing
+   - use draw option also for graph drawing in `TTree::Draw`
+6. Internals:
+   - upgrade three.js r168 -> r174
+   - use private members and methods
+   - use `WeakRef` class for cross-referencing of painters
+   - use negative indexes in arrays and Strings
+   - remove support of qt5 webengine, only qt6web can be used
 
 
 ## Changes in 7.8.2