void EditPath(Shape shape)
{
// get the existing verts
PathSegment[] oldSegments = shape.GetPathWorldSegments();
List <PathSegment> segments = new List <PathSegment>(oldSegments);
bool hasMaxSegments = segments.Count == Shape.MaxPathSegments;
// are we in delete mode? what color should handles be?
Color pink = new Color(1, 0, 0.75f);
bool deleteMode = false;
if ((Event.current.control || Event.current.command) && segments.Count > 1)
{
Handles.color = Color.red;
deleteMode = true;
}
else
{
Handles.color = pink;
}
bool splitMode = Event.current.shift;
Vector3 mouseWorldPos = GetMouseWorldPos();
bool isWithinBounds = shape.PointIsWithinShapeBounds(mouseWorldPos);
// drag handle result for getting info from our handles
CustomHandles.DragHandleResult dhResult;
// draw handles for each existing point and check if they've been moved or clicked
bool changed = false;
for (int i = segments.Count * 3 - 1; i >= 0; i--)
{
PathSegment segment = segments[i / 3];
Vector3 p = segment.p0;
bool isInfluencePoint = false;
if (i % 3 == 1)
{
p = segment.p1;
isInfluencePoint = true;
}
else if (i % 3 == 2)
{
p = segment.p2;
}
if (deleteMode && isInfluencePoint)
{
continue;
}
float size = 0.04f * HandleUtility.GetHandleSize(p);
#if UNITY_5_6_OR_NEWER
Handles.CapFunction cap = Handles.RectangleHandleCap;
#else
Handles.DrawCapFunction cap = Handles.RectangleCap;
#endif
if (isInfluencePoint)
{
#if UNITY_5_6_OR_NEWER
cap = Handles.CircleHandleCap;
#else
cap = Handles.CircleCap;
#endif
size = 0.05f * HandleUtility.GetHandleSize(p);
}
if (isInfluencePoint)
{
Color oldColor = Handles.color;
Handles.color = Color.grey;
Handles.DrawDottedLine(p, segment.p0, HandleUtility.GetHandleSize(p));
Handles.DrawDottedLine(p, segment.p2, HandleUtility.GetHandleSize(p));
Handles.color = oldColor;
}
Vector3 newPos = CustomHandles.DragHandle(p, size, cap, pink, out dhResult);
if (deleteMode && !isInfluencePoint && dhResult == CustomHandles.DragHandleResult.LMBPress)
{
// the user clicked on the handle while in delete mode, so delete the segment
segments.RemoveAt(i / 3);
changed = true;
break;
}
else if (!deleteMode && isInfluencePoint && dhResult == CustomHandles.DragHandleResult.LMBDoubleClick)
{
segment.MakeLinear();
segments[i / 3] = segment;
changed = true;
}
else if (!deleteMode && newPos != p)
{
// the handle has been dragged, so move the point to the new position
if (isInfluencePoint || isWithinBounds)
{
MovePathPoint(segments, i, newPos, moveConnected: !splitMode);
changed = true;
}
}
else if (!splitMode && !deleteMode && !isInfluencePoint &&
dhResult == CustomHandles.DragHandleResult.LMBRelease)
{
// the handle has been released. snap it to any nearby points.
for (int c = 0; c < segments.Count; c++)
{
PathSegment seg2 = segments[c];
if (seg2.p0 != newPos && Vector2.Distance(seg2.p0, newPos) < HandleUtility.GetHandleSize(newPos) * 0.25f)
{
newPos = seg2.p0;
break;
}
if (seg2.p2 != newPos && Vector2.Distance(seg2.p2, newPos) < HandleUtility.GetHandleSize(newPos) * 0.25f)
{
newPos = seg2.p2;
break;
}
}
MovePathPoint(segments, i, newPos, moveConnected: true);
changed = true;
}
}
// check if the mouse is hovering over a space where we could add a new point,
// and draw it if so
bool closeToExistingPoint = false;
if (!changed && !hasMaxSegments && !deleteMode)
{
foreach (PathSegment s in segments)
{
// if close to an existing point, we don't want to add a new one
if (Vector2.Distance(HandleUtility.WorldToGUIPoint(mouseWorldPos),
HandleUtility.WorldToGUIPoint(s.p0)) < 15)
{
closeToExistingPoint = true;
break;
}
if (Vector2.Distance(HandleUtility.WorldToGUIPoint(mouseWorldPos),
HandleUtility.WorldToGUIPoint(s.p1)) < 15)
{
closeToExistingPoint = true;
break;
}
if (Vector2.Distance(HandleUtility.WorldToGUIPoint(mouseWorldPos),
HandleUtility.WorldToGUIPoint(s.p2)) < 15)
{
closeToExistingPoint = true;
break;
}
}
if (!closeToExistingPoint && isWithinBounds)
{
// not too close to an existing vert, so draw a new one
// find the closest point
float closestDistance = 99999;
Vector2 closestPoint = Vector2.zero;
for (int i = 0; i < segments.Count; i++)
{
float dist = Vector2.Distance(segments[i].p0, (Vector2)mouseWorldPos);
if (dist < closestDistance)
{
closestPoint = segments[i].p0;
closestDistance = dist;
}
dist = Vector2.Distance(segments[i].p2, (Vector2)mouseWorldPos);
if (dist < closestDistance)
{
closestPoint = segments[i].p2;
closestDistance = dist;
}
}
// don't use an actual handle cause we want to intercept nearby clicks
// and not just clicks directly on the handle.
Rect rect = new Rect();
float dim = 0.05f * HandleUtility.GetHandleSize(mouseWorldPos);
rect.center = mouseWorldPos - new Vector3(dim, dim, 0);
rect.size = new Vector2(dim * 2, dim * 2);
Handles.color = Color.white; // remove the weird tint it does
Handles.DrawSolidRectangleWithOutline(rect, Color.green, Color.clear);
Color oldColor = Handles.color;
Handles.color = Color.grey;
Handles.DrawDottedLine(rect.center, closestPoint, HandleUtility.GetHandleSize(closestPoint));
Handles.color = oldColor;
if (Event.current.type == EventType.MouseDown && !Event.current.alt &&
!Event.current.shift && !Event.current.command && !Event.current.control)
{
// the user has clicked to add a new segment, so add it for real
segments.Add(new PathSegment(closestPoint, mouseWorldPos));
changed = true;
}
}
}
// something has been changed, so apply the new points back to the shape
if (changed)
{
Undo.RecordObject(shape, "Edit Shapes2D Path Points");
shape.SetPathWorldSegments(segments.GetRange(0, segments.Count).ToArray());
EditorUtility.SetDirty(target);
}
else
{
HandleUtility.Repaint(); // to draw the new point placeholder handle
if (Event.current.type == EventType.MouseDown && !isWithinBounds)
{
StopEditingShape(true);
}
}
}