UnityCsReference/Modules/GraphViewEditor/EdgeControl.cs at master · hardcoded2/UnityCsReference · GitHub

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// Unity C# reference source

// Copyright (c) Unity Technologies. For terms of use, see

// https://unity3d.com/legal/licenses/Unity_Reference_Only_License

using System;

using UnityEngine;

using UnityEngine.UIElements;

using System.Collections.Generic;

using UnityEngine.Profiling;

namespace UnityEditor.Experimental.GraphView

{

public class EdgeControl : VisualElement

{

private struct EdgeCornerSweepValues

{

public Vector2 circleCenter;

public double sweepAngle;

public double startAngle;

public double endAngle;

public Vector2 crossPoint1;

public Vector2 crossPoint2;

public float radius;

}

private VisualElement m_FromCap;

private VisualElement m_ToCap;

private GraphView m_GraphView;

private static Stack<VisualElement> capPool = new Stack<VisualElement>();

private static VisualElement GetCap()

{

VisualElement result = null;

if (capPool.Count > 0)

{

result = capPool.Pop();

}

else

{

result = new VisualElement();

result.AddToClassList("edgeCap");

}

return result;

}

private static void RecycleCap(VisualElement cap)

{

capPool.Push(cap);

}

public EdgeControl()

{

RegisterCallback<DetachFromPanelEvent>(OnLeavePanel);

m_FromCap = null;

m_ToCap = null;

pickingMode = PickingMode.Ignore;

generateVisualContent += OnGenerateVisualContent;

RegisterCallback<AttachToPanelEvent>(OnAttachToPanel);

RegisterCallback<DetachFromPanelEvent>(OnDetachFromPanel);

}

void MarkDirtyOnTransformChanged(GraphView gv)

{

MarkDirtyRepaint();

}

void OnAttachToPanel(AttachToPanelEvent e)

{

if (m_GraphView == null)

m_GraphView = GetFirstAncestorOfType<GraphView>();

m_GraphView.viewTransformChanged += MarkDirtyOnTransformChanged;

}

void OnDetachFromPanel(DetachFromPanelEvent e)

{

m_GraphView.viewTransformChanged -= MarkDirtyOnTransformChanged;

}

private bool m_ControlPointsDirty = true;

private bool m_RenderPointsDirty = true;

Mesh m_Mesh;

public const float k_MinEdgeWidth = 1.75f;

private const float k_EdgeLengthFromPort = 12.0f;

private const float k_EdgeTurnDiameter = 16.0f;

private const float k_EdgeSweepResampleRatio = 4.0f;

private const int k_EdgeStraightLineSegmentDivisor = 5;

static readonly Gradient k_Gradient = new Gradient();

private Orientation m_InputOrientation;

public Orientation inputOrientation

{

get { return m_InputOrientation; }

set

{

if (m_InputOrientation == value)

return;

m_InputOrientation = value;

MarkDirtyRepaint();

}

private Orientation m_OutputOrientation;

public Orientation outputOrientation

{

get { return m_OutputOrientation; }

set

{

if (m_OutputOrientation == value)

return;

m_OutputOrientation = value;

MarkDirtyRepaint();

}

[Obsolete("Use inputColor and/or outputColor")]

public Color edgeColor

{

get { return m_InputColor; }

set

{

if (m_InputColor == value && m_OutputColor == value)

return;

m_InputColor = value;

m_OutputColor = value;

MarkDirtyRepaint();

}

Color m_InputColor = Color.grey;

public Color inputColor

{

get { return m_InputColor; }

set

{

if (m_InputColor != value)

{

m_InputColor = value;

MarkDirtyRepaint();

}

Color m_OutputColor = Color.grey;

public Color outputColor

{

get { return m_OutputColor; }

set

{

if (m_OutputColor != value)

{

m_OutputColor = value;

MarkDirtyRepaint();

}

private Color m_FromCapColor;

public Color fromCapColor

{

get { return m_FromCapColor; }

set

{

if (m_FromCapColor == value)

return;

m_FromCapColor = value;

if (m_FromCap != null)

{

m_FromCap.style.backgroundColor = m_FromCapColor;

}

MarkDirtyRepaint();

}

private Color m_ToCapColor;

public Color toCapColor

{

get { return m_ToCapColor; }

set

{

if (m_ToCapColor == value)

return;

m_ToCapColor = value;

if (m_ToCap != null)

{

m_ToCap.style.backgroundColor = m_ToCapColor;

}

MarkDirtyRepaint();

}

private float m_CapRadius = 5;

public float capRadius

{

get { return m_CapRadius; }

set

{

if (m_CapRadius == value)

return;

m_CapRadius = value;

MarkDirtyRepaint();

}

private int m_EdgeWidth = 2;

public int edgeWidth

{

get { return m_EdgeWidth; }

set

{

if (m_EdgeWidth == value)

return;

m_EdgeWidth = value;

UpdateLayout(); // The layout depends on the edges width

MarkDirtyRepaint();

}

private float m_InterceptWidth = 5;

public float interceptWidth

{

get { return m_InterceptWidth; }

set { m_InterceptWidth = value; }

}

// The start of the edge in graph coordinates.

private Vector2 m_From;

public Vector2 from

{

get { return m_From; }

set

{

if ((m_From - value).sqrMagnitude > 0.25f)

{

m_From = value;

PointsChanged();

}

// The end of the edge in graph coordinates.

private Vector2 m_To;

public Vector2 to

{

get { return m_To; }

set

{

if ((m_To - value).sqrMagnitude > 0.25f)

{

m_To = value;

PointsChanged();

}

// The control points in graph coordinates.

private Vector2[] m_ControlPoints;

public Vector2[] controlPoints

{

get

{

return m_ControlPoints;

}

public bool drawFromCap

{

get { return m_FromCap != null; }

set

{

if (!value)

{

if (m_FromCap != null)

{

m_FromCap.RemoveFromHierarchy();

RecycleCap(m_FromCap);

m_FromCap = null;

}

else

{

if (m_FromCap == null)

{

m_FromCap = GetCap();

m_FromCap.style.backgroundColor = m_FromCapColor;

Add(m_FromCap);

}

public bool drawToCap

{

get { return m_ToCap != null; }

set

{

if (!value)

{

if (m_ToCap != null)

{

m_ToCap.RemoveFromHierarchy();

RecycleCap(m_ToCap);

m_ToCap = null;

}

else

{

if (m_ToCap == null)

{

m_ToCap = GetCap();

m_ToCap.style.backgroundColor = m_ToCapColor;

Add(m_ToCap);

}

void UpdateEdgeCaps()

{

if (m_FromCap != null)

{

Vector2 size = m_FromCap.layout.size;

if ((size.x > 0) && (size.y > 0))

m_FromCap.layout = new Rect(parent.ChangeCoordinatesTo(this, m_From) - (size / 2), size);

}

if (m_ToCap != null)

{

Vector2 size = m_ToCap.layout.size;

if ((size.x > 0) && (size.y > 0))

m_ToCap.layout = new Rect(parent.ChangeCoordinatesTo(this, m_To) - (size / 2), size);

}

private void OnGenerateVisualContent(MeshGenerationContext mgc)

{

UnityEngine.Profiling.Profiler.BeginSample("DrawEdge");

DrawEdge(mgc);

UnityEngine.Profiling.Profiler.EndSample();

}

public override bool ContainsPoint(Vector2 localPoint)

{

Profiler.BeginSample("EdgeControl.ContainsPoint");

if (!base.ContainsPoint(localPoint))

{

Profiler.EndSample();

return false;

}

// bounding box check succeeded, do more fine grained check by measuring distance to bezier points

// exclude endpoints

float capMaxDist = 4 * capRadius * capRadius; //(2 * CapRadius)^2

if ((from - localPoint).sqrMagnitude <= capMaxDist ||

(to - localPoint).sqrMagnitude <= capMaxDist)

{

Profiler.EndSample();

return false;

}

var allPoints = m_RenderPoints;

if (allPoints.Count > 0)

{

//we use squareDistance to avoid sqrts

float distance = (allPoints[0] - localPoint).sqrMagnitude;

float interceptWidth2 = interceptWidth * interceptWidth;

for (var i = 0; i < allPoints.Count - 1; i++)

{

Vector2 currentPoint = allPoints[i];

Vector2 nextPoint = allPoints[i + 1];

Vector2 next2Current = nextPoint - currentPoint;

float distanceNext = (nextPoint - localPoint).sqrMagnitude;

float distanceLine = next2Current.sqrMagnitude;

// if the point is somewhere between the two points

if (distance < distanceLine && distanceNext < distanceLine)

{

//https://en.wikipedia.org/wiki/Distance_from_a_point_to_a_line

var d = next2Current.y * localPoint.x -

next2Current.x * localPoint.y + nextPoint.x * currentPoint.y -

nextPoint.y * currentPoint.x;

if (d * d < interceptWidth2 * distanceLine)

{

Profiler.EndSample();

return true;

}

distance = distanceNext;

}

Profiler.EndSample();

return false;

}

public override bool Overlaps(Rect rect)

{

if (base.Overlaps(rect))

{

for (int a = 0; a < m_RenderPoints.Count - 1; a++)

{

if (RectUtils.IntersectsSegment(rect, m_RenderPoints[a], m_RenderPoints[a + 1]))

return true;

}

return false;

}

protected virtual void PointsChanged()

{

m_ControlPointsDirty = true;

MarkDirtyRepaint();

}

// The points that will be rendered. Expressed in coordinates local to the element.

List<Vector2> m_RenderPoints = new List<Vector2>();

static bool Approximately(Vector2 v1, Vector2 v2)

{

return Mathf.Approximately(v1.x, v2.x) && Mathf.Approximately(v1.y, v2.y);

}

public virtual void UpdateLayout()

{

if (parent == null) return;

if (m_ControlPointsDirty)

{

ComputeControlPoints(); // Computes the control points in parent ( graph ) coordinates

ComputeLayout(); // Update the element layout based on the control points.

m_ControlPointsDirty = false;

}

UpdateEdgeCaps();

MarkDirtyRepaint();

}

private List<Vector2> lastLocalControlPoints = new List<Vector2>();

void RenderStraightLines(Vector2 p1, Vector2 p2, Vector2 p3, Vector2 p4)

{

float safeSpan = outputOrientation == Orientation.Horizontal

? Mathf.Abs((p1.x + k_EdgeLengthFromPort) - (p4.x - k_EdgeLengthFromPort))

: Mathf.Abs((p1.y + k_EdgeLengthFromPort) - (p4.y - k_EdgeLengthFromPort));

float safeSpan3 = safeSpan / k_EdgeStraightLineSegmentDivisor;

float nodeToP2Dist = Mathf.Min(safeSpan3, k_EdgeTurnDiameter);

nodeToP2Dist = Mathf.Max(0, nodeToP2Dist);

var offset = outputOrientation == Orientation.Horizontal

? new Vector2(k_EdgeTurnDiameter - nodeToP2Dist, 0)

: new Vector2(0, k_EdgeTurnDiameter - nodeToP2Dist);

m_RenderPoints.Add(p1);

m_RenderPoints.Add(p2 - offset);

m_RenderPoints.Add(p3 + offset);

m_RenderPoints.Add(p4);

}

protected virtual void UpdateRenderPoints()

{

ComputeControlPoints(); // This should have been updated before : make sure anyway.

if (m_RenderPointsDirty == false && m_ControlPoints != null)

{

return;

}

Vector2 p1 = parent.ChangeCoordinatesTo(this, m_ControlPoints[0]);

Vector2 p2 = parent.ChangeCoordinatesTo(this, m_ControlPoints[1]);

Vector2 p3 = parent.ChangeCoordinatesTo(this, m_ControlPoints[2]);

Vector2 p4 = parent.ChangeCoordinatesTo(this, m_ControlPoints[3]);

// Only compute this when the "local" points have actually changed

if (lastLocalControlPoints.Count == 4)

{

if (Approximately(p1, lastLocalControlPoints[0]) &&

Approximately(p2, lastLocalControlPoints[1]) &&

Approximately(p3, lastLocalControlPoints[2]) &&

Approximately(p4, lastLocalControlPoints[3]))

{

m_RenderPointsDirty = false;

return;

}

Profiler.BeginSample("EdgeControl.UpdateRenderPoints");

lastLocalControlPoints.Clear();

lastLocalControlPoints.Add(p1);

lastLocalControlPoints.Add(p2);

lastLocalControlPoints.Add(p3);

lastLocalControlPoints.Add(p4);

m_RenderPointsDirty = false;

m_RenderPoints.Clear();

float diameter = k_EdgeTurnDiameter;

// We have to handle a special case of the edge when it is a straight line, but not

// when going backwards in space (where the start point is in front in y to the end point).

// We do this by turning the line into 3 linear segments with no curves. This also

// avoids possible NANs in later angle calculations.

bool sameOrientations = outputOrientation == inputOrientation;

if (sameOrientations &&

((outputOrientation == Orientation.Horizontal && Mathf.Abs(p1.y - p4.y) < 2 && p1.x + k_EdgeLengthFromPort < p4.x - k_EdgeLengthFromPort) ||

(outputOrientation == Orientation.Vertical && Mathf.Abs(p1.x - p4.x) < 2 && p1.y + k_EdgeLengthFromPort < p4.y - k_EdgeLengthFromPort)))

{

RenderStraightLines(p1, p2, p3, p4);

Profiler.EndSample();

return;

}

bool renderBothCorners = true;

EdgeCornerSweepValues corner1 = GetCornerSweepValues(p1, p2, p3, diameter, Direction.Output);

EdgeCornerSweepValues corner2 = GetCornerSweepValues(p2, p3, p4, diameter, Direction.Input);

if (!ValidateCornerSweepValues(ref corner1, ref corner2))

{

if (sameOrientations)

{

RenderStraightLines(p1, p2, p3, p4);

Profiler.EndSample();

return;

}

renderBothCorners = false;

//we try to do it with a single corner instead

Vector2 px = (outputOrientation == Orientation.Horizontal) ? new Vector2(p4.x, p1.y) : new Vector2(p1.x, p4.y);

corner1 = GetCornerSweepValues(p1, px, p4, diameter, Direction.Output);

}

m_RenderPoints.Add(p1);

if (!sameOrientations && renderBothCorners)

{

//if the 2 corners or endpoints are too close, the corner sweep angle calculations can't handle different orientations

float minDistance = 2 * diameter * diameter;

if ((p3 - p2).sqrMagnitude < minDistance ||

(p4 - p1).sqrMagnitude < minDistance)

{

Vector2 px = (p2 + p3) * 0.5f;

corner1 = GetCornerSweepValues(p1, px, p4, diameter, Direction.Output);

renderBothCorners = false;

}

GetRoundedCornerPoints(m_RenderPoints, corner1, Direction.Output);

if (renderBothCorners)

GetRoundedCornerPoints(m_RenderPoints, corner2, Direction.Input);

m_RenderPoints.Add(p4);

Profiler.EndSample();

}

private bool ValidateCornerSweepValues(ref EdgeCornerSweepValues corner1, ref EdgeCornerSweepValues corner2)

{

// Get the midpoint between the two corner circle centers.

Vector2 circlesMidpoint = (corner1.circleCenter + corner2.circleCenter) / 2;

// Find the angle to the corner circles midpoint so we can compare it to the sweep angles of each corner.

Vector2 p2CenterToCross1 = corner1.circleCenter - corner1.crossPoint1;

Vector2 p2CenterToCirclesMid = corner1.circleCenter - circlesMidpoint;

double angleToCirclesMid = outputOrientation == Orientation.Horizontal

? Math.Atan2(p2CenterToCross1.y, p2CenterToCross1.x) - Math.Atan2(p2CenterToCirclesMid.y, p2CenterToCirclesMid.x)

: Math.Atan2(p2CenterToCross1.x, p2CenterToCross1.y) - Math.Atan2(p2CenterToCirclesMid.x, p2CenterToCirclesMid.y);

if (double.IsNaN(angleToCirclesMid))

return false;

// We need the angle to the circles midpoint to match the turn direction of the first corner's sweep angle.

angleToCirclesMid = Math.Sign(angleToCirclesMid) * 2 * Mathf.PI - angleToCirclesMid;

if (Mathf.Abs((float)angleToCirclesMid) > 1.5 * Mathf.PI)

angleToCirclesMid = -1 * Math.Sign(angleToCirclesMid) * 2 * Mathf.PI + angleToCirclesMid;

// Calculate the maximum sweep angle so that both corner sweeps and with the tangents of the 2 circles meeting each other.

float h = p2CenterToCirclesMid.magnitude;

float p2AngleToMidTangent = Mathf.Acos(corner1.radius / h);

if (double.IsNaN(p2AngleToMidTangent))

return false;

float maxSweepAngle = Mathf.Abs((float)corner1.sweepAngle) - p2AngleToMidTangent * 2;

// If the angle to the circles midpoint is within the sweep angle, we need to apply our maximum sweep angle

// calculated above, otherwise the maximum sweep angle is irrelevant.

if (Mathf.Abs((float)angleToCirclesMid) < Mathf.Abs((float)corner1.sweepAngle))

{

corner1.sweepAngle = Math.Sign(corner1.sweepAngle) * Mathf.Min(maxSweepAngle, Mathf.Abs((float)corner1.sweepAngle));

corner2.sweepAngle = Math.Sign(corner2.sweepAngle) * Mathf.Min(maxSweepAngle, Mathf.Abs((float)corner2.sweepAngle));

}

return true;

}

private EdgeCornerSweepValues GetCornerSweepValues(

Vector2 p1, Vector2 cornerPoint, Vector2 p2, float diameter, Direction closestPortDirection)

{

EdgeCornerSweepValues corner = new EdgeCornerSweepValues();

// Calculate initial radius. This radius can change depending on the sharpness of the corner.

corner.radius = diameter / 2;

// Calculate vectors from p1 to cornerPoint.

Vector2 d1Corner = (cornerPoint - p1).normalized;

Vector2 d1 = d1Corner * diameter;

float dx1 = d1.x;

float dy1 = d1.y;

// Calculate vectors from p2 to cornerPoint.

Vector2 d2Corner = (cornerPoint - p2).normalized;

Vector2 d2 = d2Corner * diameter;

float dx2 = d2.x;

float dy2 = d2.y;

// Calculate the angle of the corner (divided by 2).

float angle = (float)(Math.Atan2(dy1, dx1) - Math.Atan2(dy2, dx2)) / 2;

// Calculate the length of the segment between the cornerPoint and where

// the corner circle with given radius meets the line.

float tan = (float)Math.Abs(Math.Tan(angle));

float segment = corner.radius / tan;

// If the segment is larger than the diameter, we need to cap the segment

// to the diameter and reduce the radius to match the segment. This is what

// makes the corner turn radii get smaller as the edge corners get tighter.

if (segment > diameter)

{

segment = diameter;

corner.radius = diameter * tan;

}

// Calculate both cross points (where the circle touches the p1-cornerPoint line

// and the p2-cornerPoint line).

corner.crossPoint1 = cornerPoint - (d1Corner * segment);

corner.crossPoint2 = cornerPoint - (d2Corner * segment);

// Calculation of the coordinates of the circle center.

corner.circleCenter = GetCornerCircleCenter(cornerPoint, corner.crossPoint1, corner.crossPoint2, segment, corner.radius);

// Calculate the starting and ending angles.

corner.startAngle = Math.Atan2(corner.crossPoint1.y - corner.circleCenter.y, corner.crossPoint1.x - corner.circleCenter.x);

corner.endAngle = Math.Atan2(corner.crossPoint2.y - corner.circleCenter.y, corner.crossPoint2.x - corner.circleCenter.x);

// Get the full sweep angle from the starting and ending angles.

corner.sweepAngle = corner.endAngle - corner.startAngle;

// If we are computing the second corner (into the input port), we want to start

// the sweep going backwards.

if (closestPortDirection == Direction.Input)

{

double endAngle = corner.endAngle;

corner.endAngle = corner.startAngle;

corner.startAngle = endAngle;

}

// Validate the sweep angle so it turns into the correct direction.

if (corner.sweepAngle > Math.PI)

corner.sweepAngle = -2 * Math.PI + corner.sweepAngle;

else if (corner.sweepAngle < -Math.PI)

corner.sweepAngle = 2 * Math.PI + corner.sweepAngle;

return corner;

}

private Vector2 GetCornerCircleCenter(Vector2 cornerPoint, Vector2 crossPoint1, Vector2 crossPoint2, float segment, float radius)

{

float dx = cornerPoint.x * 2 - crossPoint1.x - crossPoint2.x;

float dy = cornerPoint.y * 2 - crossPoint1.y - crossPoint2.y;

var cornerToCenterVector = new Vector2(dx, dy);

float L = cornerToCenterVector.magnitude;

if (Mathf.Approximately(L, 0))

{

return cornerPoint;

}

float d = new Vector2(segment, radius).magnitude;

float factor = d / L;

return new Vector2(cornerPoint.x - cornerToCenterVector.x * factor, cornerPoint.y - cornerToCenterVector.y * factor);

}

private void GetRoundedCornerPoints(List<Vector2> points, EdgeCornerSweepValues corner, Direction closestPortDirection)

{

// Calculate the number of points that will sample the arc from the sweep angle.

int pointsCount = Mathf.CeilToInt((float)Math.Abs(corner.sweepAngle * k_EdgeSweepResampleRatio));

int sign = Math.Sign(corner.sweepAngle);

bool backwards = (closestPortDirection == Direction.Input);

for (int i = 0; i < pointsCount; ++i)

{

// If we are computing the second corner (into the input port), the sweep is going backwards

// but we still need to add the points to the list in the correct order.

float sweepIndex = backwards ? i - pointsCount : i;

double sweepedAngle = corner.startAngle + sign * sweepIndex / k_EdgeSweepResampleRatio;

var pointX = (float)(corner.circleCenter.x + Math.Cos(sweepedAngle) * corner.radius);

var pointY = (float)(corner.circleCenter.y + Math.Sin(sweepedAngle) * corner.radius);

// Check if we overlap the previous point. If we do, we skip this point so that we

// don't cause the edge polygons to twist.

if (i == 0 && backwards)

{

if (outputOrientation == Orientation.Horizontal)

{

if (corner.sweepAngle < 0 && points[points.Count - 1].y > pointY)

continue;

else if (corner.sweepAngle >= 0 && points[points.Count - 1].y < pointY)

continue;

}

else

{

if (corner.sweepAngle < 0 && points[points.Count - 1].x < pointX)

continue;

else if (corner.sweepAngle >= 0 && points[points.Count - 1].x > pointX)

continue;

}

points.Add(new Vector2(pointX, pointY));

}

private void AssignControlPoint(ref Vector2 destination, Vector2 newValue)

{

if (!Approximately(destination, newValue))

{

destination = newValue;

m_RenderPointsDirty = true;

}

protected virtual void ComputeControlPoints()

{

if (m_ControlPointsDirty == false) return;

Profiler.BeginSample("EdgeControl.ComputeControlPoints");

float offset = k_EdgeLengthFromPort + k_EdgeTurnDiameter;

// This is to ensure we don't have the edge extending

// left and right by the offset right when the `from`

// and `to` are on top of each other.

float fromToDistance = (to - from).magnitude;

offset = Mathf.Min(offset, fromToDistance * 2);

offset = Mathf.Max(offset, k_EdgeTurnDiameter);

if (m_ControlPoints == null || m_ControlPoints.Length != 4)

m_ControlPoints = new Vector2[4];

AssignControlPoint(ref m_ControlPoints[0], from);

if (outputOrientation == Orientation.Horizontal)

AssignControlPoint(ref m_ControlPoints[1], new Vector2(from.x + offset, from.y));

else

AssignControlPoint(ref m_ControlPoints[1], new Vector2(from.x, from.y + offset));

if (inputOrientation == Orientation.Horizontal)

AssignControlPoint(ref m_ControlPoints[2], new Vector2(to.x - offset, to.y));

else

AssignControlPoint(ref m_ControlPoints[2], new Vector2(to.x, to.y - offset));

AssignControlPoint(ref m_ControlPoints[3], to);

Profiler.EndSample();

}

void ComputeLayout()

{

Profiler.BeginSample("EdgeControl.ComputeLayout");

Vector2 to = m_ControlPoints[m_ControlPoints.Length - 1];

Vector2 from = m_ControlPoints[0];

Rect rect = new Rect(Vector2.Min(to, from), new Vector2(Mathf.Abs(from.x - to.x), Mathf.Abs(from.y - to.y)));

// Make sure any control points (including tangents, are included in the rect)

for (int i = 1; i < m_ControlPoints.Length - 1; ++i)

{

if (!rect.Contains(m_ControlPoints[i]))

{

Vector2 pt = m_ControlPoints[i];

rect.xMin = Math.Min(rect.xMin, pt.x);

rect.yMin = Math.Min(rect.yMin, pt.y);

rect.xMax = Math.Max(rect.xMax, pt.x);

rect.yMax = Math.Max(rect.yMax, pt.y);

}

if (m_GraphView == null)

{

m_GraphView = GetFirstAncestorOfType<GraphView>();

}

//Make sure that we have the place to display Edges with EdgeControl.k_MinEdgeWidth at the lowest level of zoom.

float margin = Mathf.Max(edgeWidth * 0.5f + 1, EdgeControl.k_MinEdgeWidth / m_GraphView.minScale);

rect.xMin -= margin;

rect.yMin -= margin;

rect.width += margin;

rect.height += margin;

if (layout != rect)

{

layout = rect;

m_RenderPointsDirty = true;

}

Profiler.EndSample();

}

static Material s_LineMat;

static Material lineMat

{

get

{

if (s_LineMat == null)

s_LineMat = new Material(EditorGUIUtility.LoadRequired("GraphView/AAEdge.shader") as Shader);

return s_LineMat;

}

void DrawEdge(MeshGenerationContext mgc)

{

if (edgeWidth <= 0)

return;

UpdateRenderPoints();

if (m_RenderPoints.Count == 0)

return; // Don't draw anything

Color inColor = this.inputColor;

Color outColor = this.outputColor;

inColor *= UIElementsUtility.editorPlayModeTintColor;

outColor *= UIElementsUtility.editorPlayModeTintColor;

uint cpt = (uint)m_RenderPoints.Count;

var painter2D = mgc.painter2D;

float width = edgeWidth;

float alpha = 1.0f;

float zoom = m_GraphView?.scale ?? 1.0f;

if (edgeWidth * zoom < k_MinEdgeWidth)

{

alpha = edgeWidth * zoom / k_MinEdgeWidth;

width = k_MinEdgeWidth / zoom;

}

k_Gradient.SetKeys(new[]{ new GradientColorKey(outColor, 0),new GradientColorKey(inColor, 1)},new []{new GradientAlphaKey(alpha, 0)});

painter2D.BeginPath();

painter2D.strokeGradient = k_Gradient;

painter2D.lineWidth = width;

painter2D.MoveTo(m_RenderPoints[0]);

for(int i = 1 ; i < cpt ; ++i)

painter2D.LineTo(m_RenderPoints[i]);

painter2D.Stroke();

}

void OnLeavePanel(DetachFromPanelEvent e)

{

if (m_Mesh != null)

{

UnityEngine.Object.DestroyImmediate(m_Mesh);

m_Mesh = null;

}

UnityCsReference/Modules/GraphViewEditor/EdgeControl.cs at master · hardcoded2/UnityCsReference · GitHub

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