private void DrawSelfSignal(IDrawingCanvas drawingCanvas, SignalVisualElement signal)
{
// Actor line position
double aX = GetCenterX(signal.ActorA) + signal.ActorA.OffsetX;
// Left and right edges of self-signal line
double x1 = aX;
double x2 = x1 + s_selfSignalWidth;
// Top and bottom of self-signal line
double y1 = signal.OffsetY + s_signalMargin.Top;
double y2 = signal.OffsetY + signal.TextBB.Height - s_signalMargin.Bottom;
// Position of signal text
double x = x2 + s_signalPadding.Left;
double y = y1 + s_signalPadding.Top;
// Draw the text so that its left edge is along the vertical segment of the self-signal
signal.Text.TextAlignment = TextAlignment.Left;
signal.Text.SetForegroundBrush(SignalForeground);
drawingCanvas.DrawText(x, y, signal.Text);
// Draw three lines, the last one with an arrow
drawingCanvas.DrawLine(x1, y1, x2, y1, signal.LineType, SequenceArrowType.None);
drawingCanvas.DrawLine(x2, y1, x2, y2, signal.LineType, SequenceArrowType.None);
drawingCanvas.DrawLine(x2, y2, x1, y2, signal.LineType, signal.ArrowType);
}
private void DrawSignal(IDrawingCanvas drawingCanvas, SignalVisualElement signal)
{
double aX = GetCenterX(signal.ActorA) + signal.ActorA.OffsetX;
double bX = GetCenterX(signal.ActorB) + signal.ActorB.OffsetX;
// Mid-point between actors
double x = (bX + aX) / 2;
double y = signal.OffsetY + s_signalMargin.Top + s_signalPadding.Top;
// Draw the text in the middle of the signal
signal.Text.TextAlignment = TextAlignment.Center;
signal.Text.SetForegroundBrush(SignalForeground);
drawingCanvas.DrawText(x, y, signal.Text);
// Draw the line along the bottom of the signal
y = signal.OffsetY + signal.TextBB.Height - s_signalMargin.Bottom;
drawingCanvas.DrawLine(aX, y, bX, y, signal.LineType, signal.ArrowType);
}
private Size?MeasureAndArrangeVisualElements()
{
// Early out if there sequence diagram view model available
var vm = ViewModel;
if (vm == null)
{
return(null);
}
// Reset visual elements
var actors = vm.Actors;
var annotations = vm.Annotations;
m_actorVisualElements = new List <ActorVisualElement>(actors.Count);
m_signalVisualElements = new List <SignalVisualElement>();
m_noteVisualElements = new List <NoteVisualElement>();
m_actorsWidth = 0;
m_actorsHeight = 0;
m_annotationsBottom = 0;
double offsetY = Margin.Top;
// Capture typeface which is used to measure various textboxes
m_typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
// Layout actors
foreach (var actor in actors)
{
var text = GetFormattedText(actor.Name, ActorForeground);
var textBB = GetTextBB(text, s_actorMargin, s_actorPadding);
var actorVisualElement = new ActorVisualElement
{
Text = text,
TextBB = textBB,
Distances = new double?[actors.Count]
};
m_actorVisualElements.Add(actorVisualElement);
m_actorsWidth = Math.Max(textBB.Width, m_actorsWidth);
m_actorsHeight = Math.Max(textBB.Height, m_actorsHeight);
}
// Position at bottom edge of top actor text boxes
offsetY += m_actorsHeight;
// Layout all signal types
foreach (var annotation in annotations)
{
double extraWidth = 0;
bool skipFinalSignalLayout = false;
// Indexes of the left and right actors involved
int a = 0, b = 0;
// Visual element
AnnotationVisualElement annotationVisualElement = null;
// Handle signals
var signal = annotation as SignalViewModel;
if (signal != null)
{
var text = GetFormattedText(annotation.Message, SignalForeground);
var textBB = GetTextBB(text, s_signalMargin, s_signalPadding);
var signalVisualElement = new SignalVisualElement
{
Text = text,
TextBB = textBB,
OffsetY = offsetY,
IsSelfSignal = signal.IsSelf(),
ActorA = m_actorVisualElements[signal.ActorA.Index],
ActorB = m_actorVisualElements[signal.ActorB.Index],
LineType = signal.LineType,
ArrowType = signal.ArrowType,
};
annotationVisualElement = signalVisualElement;
m_signalVisualElements.Add(signalVisualElement);
if (signal.IsSelf())
{
// Self-signals need a minimum height
a = signal.ActorA.Index;
b = a + 1;
// Self-signals take up extra horizontal space
extraWidth += s_selfSignalWidth;
}
else
{
a = Math.Min(signal.ActorA.Index, signal.ActorB.Index);
b = Math.Max(signal.ActorA.Index, signal.ActorB.Index);
}
}
// Handle notes
var note = annotation as NoteViewModel;
if (note != null)
{
var text = GetFormattedText(annotation.Message, NoteForeground);
var textBB = GetTextBB(text, s_noteMargin, s_notePadding);
var noteVisualElement = new NoteVisualElement
{
Text = text,
TextBB = textBB,
OffsetY = offsetY,
Placement = note.Placement,
Message = note.Message,
Actors = note.Actors.Select(actor => m_actorVisualElements[actor.Index]).ToArray(),
};
annotationVisualElement = noteVisualElement;
m_noteVisualElements.Add(noteVisualElement);
if (note.Placement == SequenceNotePlacement.LeftOf)
{
b = note.Actors[0].Index;
a = b - 1;
}
else if (note.Placement == SequenceNotePlacement.RightOf)
{
a = note.Actors[0].Index;
b = a + 1;
}
else if (note.Placement == SequenceNotePlacement.Over)
{
if (note.Actors.Length > 1)
{
// Over multiple actors
a = Math.Min(note.Actors[0].Index, note.Actors[1].Index);
b = Math.Max(note.Actors[0].Index, note.Actors[1].Index);
// We don't need our padding, and we want to overlap
extraWidth = -(s_noteMargin.Left + s_noteMargin.Right + s_noteOverlap.Left + s_noteOverlap.Right);
}
else
{
// Over single actor
a = note.Actors[0].Index;
ActorEnsureDistance(a - 1, a, noteVisualElement.TextBB.Width / 2);
ActorEnsureDistance(a, a + 1, noteVisualElement.TextBB.Width / 2);
// Skip calculation of the signal height in this case
skipFinalSignalLayout = true;
}
}
}
// Ensure proper spacing between actors
if (!skipFinalSignalLayout)
{
ActorEnsureDistance(a, b, annotationVisualElement.TextBB.Width + extraWidth);
}
// Adjust offset by by annotiation height
offsetY += annotationVisualElement.TextBB.Height;
}
m_annotationsBottom = offsetY;
// Compute the overall size of the diagram
double actorsX = 0;
foreach (var actor in m_actorVisualElements)
{
actor.OffsetX = Math.Max(actorsX, actor.OffsetX);
// This requires that we enumerate distances in order
for (int i = 0; i < actor.Distances.Length; ++i)
{
double?distance = actor.Distances[i];
// Only process well-defined distances
if (distance.HasValue)
{
ActorVisualElement b = m_actorVisualElements[i];
double d = Math.Max(distance.Value, Math.Max(m_actorsWidth / 2, b.TextBB.Width / 2));
b.OffsetX = Math.Max(b.OffsetX, actor.OffsetX + m_actorsWidth / 2 + d - b.TextBB.Width / 2);
}
}
actorsX = actor.OffsetX + m_actorsWidth + actor.PaddingRight;
}
// Determine total size
Size size = new Size();
size.Width = actorsX + Margin.Left + Margin.Right;
size.Height = Margin.Top + Margin.Bottom + m_annotationsBottom + m_actorsHeight;
return(size);
}
