The Log Graph Dialog show the history of an item in a graphical view. It shows when an item or a copy (ie. a branch or a tag) of that item was modified and at which revision it was copied.
The graph is sorted by revision and by path. Sorted by revision means that the revisions are sorted from left to right by their revision number. Sorted by path means that commit revisions which modify an item in the same path are grouped together.
Groups use different colors depending on their distance to the original source path. In the screen shot the grey box (top left) is the group for the /trunk path. At revision r1464 a new branch (1.1.x) was created from /trunk. Since the branch has a differnt path we get a new group in a different color. Its distance to the original source (ie. /trunk) is 1. The tags created in revision r1475 and r1498 create two new groups (different paths) but in the same color since the distance to their original source (/trunk) is 2.
At the moment you can use the log graph only to view diffs between revision which is described in the next section.
To zoom in or out, move the mouse into the button area and use the mousewheel.
To view the differences between two revisions simply select both revisions (use shift to select the second revision) and open the diff dialog by clicking on the diff button. This will open subcommanders normal diff dialog filled with the selected revisions and paths.
You can also select a group box which represents the head revision.