Is there currently any way to turn on alignment guides like are available in Visio that will temporarily add lines showing when nodes’ top/middle/etc are aligned? Or do you have any suggestions as to how best implement this feature?
Thanks
Ryan
No, there isn’t a general facility like that that you could turn on.
But you could implement it yourself. I found this code for GoSilverlight that shows an “insertion” line, which is basically like a guideline, as the user drags a node:
// myDiagram.DraggingTool = new VerticalInsertionDraggingTool();
public class VerticalInsertionDraggingTool : DraggingTool {
public override void DoActivate() {
this.Diagram.Cursor = Cursors.Hand;
this.InsertionCursor = CreateInsertionCursor();
this.Diagram.PartsModel.AddNode(this.InsertionCursor);
base.DoActivate();
}
public override void DoDeactivate() {
this.Diagram.Cursor = null;
this.Diagram.PartsModel.RemoveNode(this.InsertionCursor);
this.InsertionCursor = null;
base.DoDeactivate();
}
protected Node InsertionCursor { get; set; }
protected Node CreateInsertionCursor() {
Node n = new Node();
n.Id = "InsertionCursor";
n.LayerName = "Tool";
var line = new System.Windows.Shapes.Line();
line.Stroke = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Red);
line.StrokeThickness = 1;
line.X1 = -1000;
line.Y1 = 0;
line.X2 = +1000;
line.Y2 = 0;
n.Content = line;
return n;
}
protected override void DragOver(Point pt, bool moving, bool copying) {
if (this.InsertionCursor != null) {
double miny = Double.MaxValue;
double maxy = Double.MinValue;
foreach (Node n in this.Diagram.Nodes) {
if (!n.Visible || !n.IsBoundToData) continue;
if (moving && this.DraggedParts != null && this.DraggedParts.ContainsKey(n)) continue;
if (copying && this.CopiedParts != null && this.CopiedParts.ContainsKey(n)) continue;
Rect b = n.Bounds;
miny = Math.Min(miny, b.Y);
maxy = Math.Max(maxy, b.Y+b.Height);
if (b.Y <= pt.Y && pt.Y <= b.Y+b.Height/2) {
this.InsertionCursor.Position = new Point(pt.X, b.Y);
break;
} else if (b.Y+b.Height/2 <= pt.Y && pt.Y <= b.Y+b.Height) {
this.InsertionCursor.Position = new Point(pt.X, b.Y+b.Height);
break;
}
}
if (pt.Y <= miny && miny < Double.MaxValue) {
this.InsertionCursor.Position = new Point(pt.X, miny);
} else if (pt.Y >= maxy && maxy > Double.MinValue) {
this.InsertionCursor.Position = new Point(pt.X, maxy);
}
}
base.DragOver(pt, moving, copying);
}
}