public override void CachePosition()
{
var innerWidth = innerPosition.width;
var innerHeight = innerPosition.height;
var edgeWidth = edgePosition.width;
var edgeHeight = edgePosition.height;
var labelWidth = Styles.label.CalcSize(label).x;
var labelHeight = EditorGUIUtility.singleLineHeight;
sourcePosition = canvas.Widget(transition.source).position;
destinationPosition = canvas.Widget(transition.destination).position;
Vector2 sourceClosestPoint;
Vector2 destinationClosestPoint;
LudiqGUIUtility.ClosestPoints(sourcePosition, destinationPosition, out sourceClosestPoint, out destinationClosestPoint);
if (transition.destination != transition.source)
{
GraphGUI.GetConnectionEdge
(
sourceClosestPoint,
destinationClosestPoint,
out sourceEdge,
out destinationEdge
);
}
else
{
sourceEdge = Edge.Right;
destinationEdge = Edge.Left;
}
sourceEdgeCenter = sourcePosition.GetEdgeCenter(sourceEdge);
destinationEdgeCenter = destinationPosition.GetEdgeCenter(destinationEdge);
siblingStateTransitions.Clear();
var siblingIndex = 0;
// Assign one common axis for transition for all siblings,
// regardless of their inversion. The axis is arbitrarily
// chosen as the axis for the first transition.
var assignedTransitionAxis = false;
var transitionAxis = Vector2.zero;
foreach (var graphTransition in canvas.graph.transitions)
{
var current = transition == graphTransition;
var analog =
transition.source == graphTransition.source &&
transition.destination == graphTransition.destination;
var inverted =
transition.source == graphTransition.destination &&
transition.destination == graphTransition.source;
if (current)
{
siblingIndex = siblingStateTransitions.Count;
}
if (current || analog || inverted)
{
if (!assignedTransitionAxis)
{
var siblingStateTransitionDrawer = canvas.Widget <IStateTransitionWidget>(graphTransition);
transitionAxis = siblingStateTransitionDrawer.sourceEdge.Normal();
assignedTransitionAxis = true;
}
siblingStateTransitions.Add(graphTransition);
}
}
// Fix the edge case where the source and destination perfectly overlap
if (transitionAxis == Vector2.zero)
{
transitionAxis = Vector2.right;
}
// Calculate the spread axis and origin for the set of siblings
var spreadAxis = transitionAxis.Perpendicular1().Abs();
var spreadOrigin = (sourceEdgeCenter + destinationEdgeCenter) / 2;
if (transition.source == transition.destination)
{
spreadAxis = Vector2.up;
spreadOrigin = sourcePosition.GetEdgeCenter(Edge.Bottom) - Vector2.down * 10;
}
if (LudiqCore.Configuration.developerMode && LudiqGraphs.Configuration.debug)
{
Handles.BeginGUI();
Handles.color = Color.yellow;
Handles.DrawLine(spreadOrigin + spreadAxis * -1000, spreadOrigin + spreadAxis * 1000);
Handles.EndGUI();
}
// Calculate the offset of the current sibling by iterating over its predecessors
var spreadOffset = 0f;
var previousSpreadSize = 0f;
for (var i = 0; i <= siblingIndex; i++)
{
var siblingSize = canvas.Widget <IStateTransitionWidget>(siblingStateTransitions[i]).outerPosition.size;
var siblingSizeProjection = GraphGUI.SizeProjection(siblingSize, spreadOrigin, spreadAxis);
spreadOffset += previousSpreadSize / 2 + siblingSizeProjection / 2;
previousSpreadSize = siblingSizeProjection;
}
if (transition.source != transition.destination)
{
// Calculate the total spread size to center the sibling set
var totalSpreadSize = 0f;
for (var i = 0; i < siblingStateTransitions.Count; i++)
{
var siblingSize = canvas.Widget <IStateTransitionWidget>(siblingStateTransitions[i]).outerPosition.size;
var siblingSizeProjection = GraphGUI.SizeProjection(siblingSize, spreadOrigin, spreadAxis);
totalSpreadSize += siblingSizeProjection;
}
spreadOffset -= totalSpreadSize / 2;
}
// Finally, calculate the positions
middle = spreadOrigin + spreadOffset * spreadAxis;
var edgeX = middle.x - edgeWidth / 2;
var edgeY = middle.y - edgeHeight / 2;
_position = new Rect
(
edgeX,
edgeY,
edgeWidth,
edgeHeight
).PixelPerfect();
var innerX = innerPosition.x;
var innerY = innerPosition.y;
_clippingPosition = _position.Encompass(sourceEdgeCenter).Encompass(destinationEdgeCenter);
if (transition.source != transition.destination)
{
entryEdge = destinationEdge;
exitEdge = sourceEdge;
}
else
{
entryEdge = sourceEdge;
exitEdge = destinationEdge;
}
entryEdgeCenter = edgePosition.GetEdgeCenter(entryEdge);
exitEdgeCenter = edgePosition.GetEdgeCenter(exitEdge);
var x = innerX;
iconPosition = new Rect
(
x,
innerY,
Styles.eventIcon.fixedWidth,
Styles.eventIcon.fixedHeight
).PixelPerfect();
x += iconPosition.width;
var clipWidth = innerWidth - (x - innerX);
clipPosition = new Rect
(
x,
edgeY,
clipWidth,
edgeHeight
).PixelPerfect();
labelInnerPosition = new Rect
(
Styles.spaceAroundIcon,
innerY - edgeY,
labelWidth,
labelHeight
).PixelPerfect();
}