/// <summary>
/// This methods draws the graph for the changeset history grid.
/// </summary>
public void Draw(ItemCollection commitList)
{
if (graph == null)
return;
Console.WriteLine("Drawing graph.");
var repo = new LibGit2Sharp.Repository(repositoryViewModel.RepositoryFullPath);
commitDotPositions.Clear();
SetBranchColors(repo.Branches);
// Loop through all commits and draw the graph, in reverse order.
commitList.MoveCurrentToLast();
// Clear the existing graph.
graph.Children.Clear();
TotalHeight = 0;
while (true)
{
Commit commit = commitList.CurrentItem as Commit;
int rowNumber = commitList.CurrentPosition;
if (commit == null)
break;
// Get a list of branches around this commit.
List<Branch> branchesAroundCommit = commit.BranchesAround;
// Sort the lists alphabetically.
branchesAroundCommit.OrderBy(o => o.Name.ToString());
// Retrieve the index of this commit's branch on the list. This index determines the horizontal positions of dots (commit dots).
int indexOfCurrentBranch;
if (commit.Branches.Count > 0)
indexOfCurrentBranch = branchesAroundCommit.IndexOf(commit.Branches.ElementAt(0));
else
indexOfCurrentBranch = 0;
int horizontalIndex = indexOfCurrentBranch + commit.VisualPosition;
for (var i = indexOfCurrentBranch - 1; i >= 0; i--)
horizontalIndex += ((Branch) branchesAroundCommit.ElementAt(i)).RightMostVisualPosition;
// Draw the dot/ellipse based on the index of the current branch.
byte dotSize = 10;
byte horizontalDotSpacing = 12;
int dotX = horizontalDotSpacing + dotSize * horizontalIndex + horizontalDotSpacing * horizontalIndex;
int dotY = cellHeight * rowNumber + cellHeight / 2 - dotSize / 2;
if (TotalHeight == 0)
TotalHeight = cellHeight * (rowNumber + 1);
// Store the dot position on the dictionary.
commitDotPositions.Add(commit.Hash, new int[2] { dotX, dotY });
Ellipse dot = new Ellipse
{
Fill = Brushes.Black,
StrokeThickness = 0,
Width = dotSize + 2,
Height = dotSize + 2
};
Canvas.SetLeft(dot, dotX - 1);
Canvas.SetTop(dot, dotY - 1);
Canvas.SetZIndex(dot, 1);
graph.Children.Add(dot);
// ToolTip for commits.
var commitTooltip = new TextBlock
{
MaxWidth = 320,
TextWrapping = TextWrapping.Wrap
};
// ToolTip for paths.
var pathTooltip = new TextBlock
{
MaxWidth = 320,
TextWrapping = TextWrapping.Wrap
};
if (commit.Branches.Count == 1)
{
pathTooltip.Text = commit.Branches.ElementAt(0).Name;
}
else
{
int i = 0, count = commit.Branches.Count;
commit.Branches.ForEach(b =>
{
i++;
pathTooltip.Inlines.AddRange(new Inline[]
{
new Run(b.Name + (i < count ? ", " : "")),
});
});
}
// Regular commits have a white circle inside.
if (commit.IsMergeCommit() == false && commit.ParentCount < 2)
{
Ellipse dotInner = new Ellipse
{
Fill = Brushes.White,
StrokeThickness = 0,
Width = dotSize,
Height = dotSize
};
Canvas.SetLeft(dotInner, dotX);
Canvas.SetTop(dotInner, dotY);
Canvas.SetZIndex(dotInner, 2);
graph.Children.Add(dotInner);
// ToolTip.
commitTooltip.Inlines.AddRange(new Inline[]
{
new Run("Commit: ") {FontWeight = FontWeights.Bold},
new Run(commit.HashShort) {Foreground = highlightColor, FontWeight = FontWeights.Bold},
new LineBreak(),
new Run("Author: ") {FontWeight = FontWeights.Bold},
new Run(commit.AuthorName) ,
new LineBreak(),
new Run("Date: ") {FontWeight = FontWeights.Bold},
new Run(commit.FormattedDate),
new LineBreak(),
new LineBreak(),
new Run(commit.Description.TrimEnd())
});
dotInner.ToolTip = commitTooltip;
ToolTipService.SetShowDuration(dotInner, 60000);
ToolTipService.SetInitialShowDelay(dotInner, 1);
}
else
{
// Tooltip.
commitTooltip.Inlines.AddRange(new Inline[]
{
new Run("Merge commit: ") {FontWeight = FontWeights.Bold},
new Run(commit.HashShort) {Foreground = highlightColor, FontWeight = FontWeights.Bold},
new LineBreak(),
new Run("Author: ") {FontWeight = FontWeights.Bold},
new Run(commit.AuthorName) ,
new LineBreak(),
new Run("Date: ") {FontWeight = FontWeights.Bold},
new Run(commit.FormattedDate),
new LineBreak(),
new LineBreak(),
new Run(commit.Description.TrimEnd())
});
dot.ToolTip = commitTooltip;
ToolTipService.SetShowDuration(dot, 60000);
ToolTipService.SetInitialShowDelay(dot, 1);
}
if (commit.Branches.Count > 0)
{
// Draw the line to the parent dot(s)/commit(s).
foreach (string hash in commit.ParentHashes)
{
// Retrieve the parent commit dot position.
var positions = commitDotPositions.Where(o => o.Key == hash);
if (positions.Count() > 0)
{
int[] parentPosition = commitDotPositions.Where(o => o.Key == hash).First().Value;
Brush lineColor = BranchColors[commit.Branches.ElementAt(0).Name];
// Calculate line positions.
float startLineX1 = dotX + dotSize / 2;
float startLineY1 = dotY + dotSize / 2;
float endLineX2 = parentPosition[0] + dotSize / 2;
float endLineY2 = parentPosition[1] + dotSize / 2;
float startLineX2;
float startLineY2;
float endLineX1;
float endLineY1;
if (commit.IsMergeCommit())
{
startLineX2 = endLineX2;
startLineY2 = startLineY1;
endLineX1 = endLineX2;
endLineY1 = startLineY1;
}
else
{
startLineX2 = startLineX1;
startLineY2 = parentPosition[1] - cellHeight / 2 + dotSize / 2 + 6;
endLineX1 = startLineX1;
endLineY1 = parentPosition[1] - cellHeight / 2 + dotSize / 2 + 12;
}
// Construct and draw the line path.
Path path = new Path
{
Stroke = lineColor,
StrokeThickness = 4,
Data = new PathGeometry
{
Figures = new PathFigureCollection
{
new PathFigure
{
StartPoint = new Point(startLineX1, startLineY1),
Segments = new PathSegmentCollection
{
new PolyBezierSegment
{
Points = new PointCollection
{
new Point(startLineX2, startLineY2),
new Point(endLineX1, endLineY1),
new Point(endLineX2, endLineY2)
}
}
}
}
}
}
};
graph.Children.Add(path);
path.ToolTip = pathTooltip;
ToolTipService.SetShowDuration(path, 60000);
ToolTipService.SetInitialShowDelay(path, 1);
}
}
}
commitList.MoveCurrentToPrevious();
if (commitList.IsCurrentBeforeFirst)
{
break;
}
}
repo.Dispose();
}
