# HG changeset patch
# User Peer Sommerlund <[email protected]>
# Date 1251705047 -7200
logview: Describe grapher interface at module header
All graphers in the revgraph module returns the same datatype,
thus it is more natural to describe it at the module header.
diff -r 7f1520bda792 -r 6706113d1ab3 hggtk/logview/revgraph.py
--- a/hggtk/logview/revgraph.py
+++ b/hggtk/logview/revgraph.py
@@ -3,6 +3,45 @@
This module contains the code to produce an ordered directed graph of a
Mercurial repository, such as we display in the tree view at the top of the
history window. Original code was from graphlog extension.
+
+The generator functions walks through the revision history and for the
+selected revision emits tuples with the following elements:
+
+ (curr_rev, node, lines, parents)
+
+ - Current revision.
+ - node; defined as tuple (rev_column, rev_color)
+ - lines; a list of (col, next_col, color) indicating the edges between
+ the current row and the next row
+ - parent revisions of current revision
+
+The node tuple has the following elements:
+ - rev_column: Column for the node "circle"
+ - rev_color: Color used to render the circle
+
+The lines tuple has the following elements:
+ - col: Column for the upper end of the line.
+ - nextcol: Column for the lower end of the line.
+ - color: Colour used for line
+
+The data is used in treeview.populate with the following signature
+ (rev, node, lines, parents) = self.grapher.next()
+and stored in treeview.graphdata
+
+The treeview.model is an instance of treemodel which references
+treeview.graphdata
+
+treemodel stores it in self.line_graph_data, and extracts it
+in on_get_value, where it is mapped to several columns.
+ REVID, NODE, LINES, PARENTS, LAST_LINES
+LAST_LINES is a copy of LINES from the previous row
+
+treeview maps columns
+ treemodel.NODE, treemodel.LAST_LINES, treemodel.LINES
+to CellRendererGraph attributes
+ "node", "in-lines", "out-lines"
+which stores it in varables
+ node, in_lines, out_lines
"""
__copyright__ = "Copyright 2007 Joel Rosdahl, 2008 Steve Borho"
@@ -29,16 +68,15 @@
def revision_grapher(repo, start_rev, stop_rev, branch=None, noheads=False,
branch_color=False):
"""incremental revision grapher
- This generator function walks through the revision history from
- revision start_rev to revision stop_rev (which must be less than
- or equal to start_rev) and for each revision emits tuples with the
- following elements:
-
- - Current revision.
- - lines; a list of (col, next_col, color) indicating the edges between
- the current row and the next row
- - Column of the current node in the set of ongoing edges.
- - parent revisions of current revision
+ This grapher generates a full graph where every edge is visible.
+ This means that repeated merges between two branches may make
+ the graph very wide.
+
+ if branch is set to the name of a branch, only this branch is shown.
+ if noheads is True, other heads than start_rev is hidden. Use this
+ to show ancestors of a revision.
+ if branch_color is True, the branch colour is determined by a hash
+ of the branch tip, and will thus always be the same.
"""
assert start_rev >= stop_rev
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