public DragAndDropForm()
{
InitializeComponent();
description.LoadFile(new MemoryStream(Resources.description), RichTextBoxStreamType.RichText);
InitializeStylesList();
// add the visual grid
const int gridWidth = 80;
GridInfo gridInfo = new GridInfo(gridWidth);
var grid = new GridVisualCreator(gridInfo);
graphControl.BackgroundGroup.AddChild(grid, CanvasObjectDescriptors.AlwaysDirtyInstance);
// Create and configure a GraphSnapContext to enable snapping
var context = new GraphSnapContext
{
NodeToNodeDistance = 30,
NodeToEdgeDistance = 20,
SnapOrthogonalMovement = false,
SnapDistance = 10,
SnapSegmentsToSnapLines = true,
NodeGridConstraintProvider = new GridConstraintProvider <INode>(gridInfo),
BendGridConstraintProvider = new GridConstraintProvider <IBend>(gridInfo),
SnapBendsToSnapLines = true,
GridSnapType = GridSnapTypes.All
};
// Create and register a graph editor input mode for editing the graph
// in the canvas.
var editorInputMode = new GraphEditorInputMode();
editorInputMode.SnapContext = context;
editorInputMode.AllowGroupingOperations = true;
ConfigureNodeDropInputMode(editorInputMode);
// use the mode in our control
graphControl.InputMode = editorInputMode;
// Set the default node style to the style of the first item in the list of nodes
if (styleListBox.Items.Count > 0)
{
INode node = styleListBox.Items[0] as INode;
if (node != null)
{
graphControl.Graph.NodeDefaults.Style = node.Style;
}
}
graphControl.Graph.SetUndoEngineEnabled(true);
// populate the control with some nodes
CreateSampleGraph();
featuresComboBox.Items.AddRange(functionOptions);
featuresComboBox.SelectedIndex = 0;
}
private void InitializeSnapping()
{
// Initialize snapping state
SnappingEnabled = snappingButton.Checked;
// Initialize SnapContext
GraphEditorInputMode geim = graphControl.InputMode as GraphEditorInputMode;
if (geim != null)
{
graphSnapContext = new GraphSnapContext
{
// disable snapping features as shown in previous tutorial step
// so they won't distract from grid snapping.
// Please note that snapping and grid snapping
// can be used together
Enabled = SnappingEnabled,
SnapBendAdjacentSegments = false,
SnapBendsToSnapLines = false,
SnapNodesToSnapLines = false,
SnapOrthogonalMovement = false,
SnapPortAdjacentSegments = false,
SnapSegmentsToSnapLines = false
};
labelSnapContext = new LabelSnapContext
{
Enabled = SnappingEnabled,
};
geim.SnapContext = graphSnapContext;
geim.LabelSnapContext = labelSnapContext;
}
}
override protected void CollectGridSnapResults(GraphSnapContext context, CollectSnapResultsEventArgs args, RectD suggestedLayout, INode node)
{
// node.Layout isn't updated, yet, so we have to calculate the delta between the the new suggested layout and the current node.Layout
PointD delta = suggestedLayout.TopLeft - node.Layout.GetTopLeft();
// get outline of the shape and iterate over it's path point
IShapeGeometry geometry = node.Style.Renderer.GetShapeGeometry(node, node.Style);
GeneralPath outline = geometry.GetOutline();
if (outline != null)
{
GeneralPath.PathCursor cursor = outline.CreateCursor();
while (cursor.MoveNext())
{
// ignore PathType.Close as we had the path point as first point
// and cursor.CurrentEndPoint is always (0, 0) for PathType.Close
if (cursor.PathType != PathType.Close)
{
// adjust path point by the delta calculated above and add an according SnapResult
PointD endPoint = cursor.CurrentEndPoint + delta;
AddGridSnapResultCore(context, args, endPoint, node, GridSnapTypes.GridPoints, SnapPolicy.ToNearest, SnapPolicy.ToNearest);
}
}
}
}
protected virtual void InitializeSnapContext()
{
snapContext = new GraphSnapContext();
snapContext.Enabled = false;
// disable grid snapping
snapContext.GridSnapType = GridSnapTypes.None;
// add constraint provider for nodes, bends, and ports
snapContext.NodeGridConstraintProvider = new GridConstraintProvider <INode>(gridInfo);
snapContext.BendGridConstraintProvider = new GridConstraintProvider <IBend>(gridInfo);
snapContext.PortGridConstraintProvider = new GridConstraintProvider <IPort>(gridInfo);
}
public DragAndDropWindow()
{
InitializeComponent();
InitializeStylesList();
// add the visual grid
const int gridWidth = 80;
GridInfo gridInfo = new GridInfo(gridWidth);
var grid = new GridVisualCreator(gridInfo);
graphControl.BackgroundGroup.AddChild(grid);
// Create and configure a GraphSnapContext to enable snapping
var context = new GraphSnapContext
{
NodeToNodeDistance = 30,
NodeToEdgeDistance = 20,
SnapOrthogonalMovement = false,
SnapDistance = 10,
SnapSegmentsToSnapLines = true,
NodeGridConstraintProvider = new GridConstraintProvider <INode>(gridInfo),
BendGridConstraintProvider = new GridConstraintProvider <IBend>(gridInfo),
SnapBendsToSnapLines = true,
GridSnapType = GridSnapTypes.All
};
// Create and register a graph editor input mode for editing the graph
// in the canvas.
var editorInputMode = new GraphEditorInputMode {
AllowGroupingOperations = true
};
editorInputMode.SnapContext = context;
editorInputMode.OrthogonalEdgeEditingContext = new OrthogonalEdgeEditingContext();
// use the style, size and labels of the currently selected palette node for newly created nodes
editorInputMode.NodeCreator = GetNodeCreator(editorInputMode.NodeCreator);
ConfigureNodeDropInputMode(editorInputMode);
// use the mode in our control
graphControl.InputMode = editorInputMode;
// Enable undo
graphControl.Graph.SetUndoEngineEnabled(true);
// populate the control with some nodes
CreateSampleGraph();
featuresComboBox.ItemsSource = functionOptions;
featuresComboBox.SelectedIndex = 0;
}
/// <summary>
/// Creates a pre-configured <see cref="GraphSnapContext"/> for this demo.
/// </summary>
protected virtual GraphSnapContext CreateGraphSnapContext()
{
var context = new GraphSnapContext
{
SnapOrthogonalMovement = false,
SnapBendAdjacentSegments = true,
GridSnapType = GridSnapTypes.All,
SnapDistance = 10
};
// use the free additional snap lines
context.CollectSnapLines += CollectAdditionalGraphSnapLines;
return(context);
}
// Adds grid to the GraphControl and grid constraint provider to the snap context
protected virtual void InitializeGrid(GraphSnapContext context)
{
GridInfo gridInfo = new GridInfo {
HorizontalSpacing = 200, VerticalSpacing = 200
};
grid = new GridVisualCreator(gridInfo);
GraphControl.BackgroundGroup.AddChild(grid, CanvasObjectDescriptors.AlwaysDirtyInstance);
GraphControl.Invalidate();
GraphControl.ZoomChanged += delegate { GraphControl.Invalidate(); };
GraphControl.ViewportChanged += delegate { GraphControl.Invalidate(); };
context.NodeGridConstraintProvider = new GridConstraintProvider <INode>(gridInfo);
context.BendGridConstraintProvider = new GridConstraintProvider <IBend>(gridInfo);
}
private void InitializeSnapping()
{
// Initialize snapping state
SnappingEnabled = snappingButton.IsChecked ?? false;
// Initialize SnapContext
GraphEditorInputMode geim = graphControl.InputMode as GraphEditorInputMode;
if (geim != null)
{
snapContext = new GraphSnapContext
{
Enabled = SnappingEnabled,
};
geim.SnapContext = snapContext;
}
}
public SnapLinesForm()
{
InitializeComponent();
description.LoadFile(new MemoryStream(Resources.description), RichTextBoxStreamType.RichText);
SetupOptions();
snapContext = new GraphSnapContext();
// intialize input mode
graphEditorInputMode = new GraphEditorInputMode()
{
AllowGroupingOperations = true,
OrthogonalEdgeEditingContext = new OrthogonalEdgeEditingContext(),
SnapContext = snapContext
};
GraphControl.InputMode = graphEditorInputMode;
GraphControl.Graph.GetDecorator().EdgeDecorator.EdgeReconnectionPortCandidateProviderDecorator.SetImplementation(
edge => true, EdgeReconnectionPortCandidateProviders.AllNodeCandidates);
// initialize grid
this.gridInfo = new GridInfo {
HorizontalSpacing = 30, VerticalSpacing = 30
};
grid = new GridVisualCreator(gridInfo);
GraphControl.BackgroundGroup.AddChild(grid);
snapContext.NodeGridConstraintProvider = new GridConstraintProvider <INode>(gridInfo);
snapContext.BendGridConstraintProvider = new GridConstraintProvider <IBend>(gridInfo);
// initialize current values
OnSnappingChanged(this, null);
OnGridHorizontalWidthChanged(this, null);
OnGridVerticalWidthChanged(this, null);
GraphControl.Invalidate();
GraphControl.ZoomChanged += delegate { UpdateGrid(); };
GraphControl.ViewportChanged += delegate { UpdateGrid(); };
InitializeGraph();
}
/// <summary>
/// Calls <see cref="ISnapLineProvider.AddSnapLines"/> of the wrapped provider and adds custom <see cref="OrthogonalSnapLine"/>s
/// for the <paramref name="item"/>.
/// </summary>
/// <param name="context">The context which holds the settings for the snap lines. </param>
/// <param name="args">The argument to use for adding snap lines.</param>
/// <param name="item">The item to add snaplines for.</param>
public void AddSnapLines(GraphSnapContext context, CollectGraphSnapLinesEventArgs args, IModelItem item)
{
wrapped.AddSnapLines(context, args, item);
// add snaplines for orthogonal labels
ILabelOwner labelOwner = item as ILabelOwner;
if (labelOwner != null)
{
foreach (ILabel label in labelOwner.Labels)
{
var layout = label.GetLayout();
double upX = Math.Round(layout.UpX, 6); // round UpX to it's first 6 digits
if (upX == 0 || upX == 1 || upX == -1) // check if it's orthogonal
// label is orthogonal
{
RectD bounds = layout.GetBounds();
// add snaplines to the top, bottom, left and right border of the label
PointD topCenter = bounds.TopLeft + new PointD(layout.Width / 2, 0);
var snapLine = new OrthogonalSnapLine(SnapLineOrientation.Horizontal, SnapLineSnapTypes.Bottom,
SnapLine.SnapLineFixedLineKey, topCenter, bounds.MinX - 10, bounds.MaxX + 10, label, 100);
args.AddAdditionalSnapLine(snapLine);
PointD bottomCenter = bounds.BottomLeft + new PointD(layout.Width / 2, 0);
snapLine = new OrthogonalSnapLine(SnapLineOrientation.Horizontal, SnapLineSnapTypes.Top,
SnapLine.SnapLineFixedLineKey, bottomCenter, bounds.MinX - 10, bounds.MaxX + 10, label, 100);
args.AddAdditionalSnapLine(snapLine);
PointD leftCenter = bounds.TopLeft + new PointD(0, layout.Height / 2);
snapLine = new OrthogonalSnapLine(SnapLineOrientation.Vertical, SnapLineSnapTypes.Right,
SnapLine.SnapLineFixedLineKey, leftCenter, bounds.MinY - 10, bounds.MaxY + 10, label, 100);
args.AddAdditionalSnapLine(snapLine);
PointD rightCenter = bounds.TopRight + new PointD(0, layout.Height / 2);
snapLine = new OrthogonalSnapLine(SnapLineOrientation.Vertical, SnapLineSnapTypes.Left,
SnapLine.SnapLineFixedLineKey, rightCenter, bounds.MinY - 10, bounds.MaxY + 10, label, 100);
args.AddAdditionalSnapLine(snapLine);
}
}
}
}
private void InitializeSnapping()
{
// Initializes snapping state
SnappingEnabled = snappingButton.Checked;
// Initializes SnapContext
GraphEditorInputMode geim = graphControl.InputMode as GraphEditorInputMode;
if (geim != null)
{
graphSnapContext = new GraphSnapContext
{
Enabled = SnappingEnabled,
};
labelSnapContext = new LabelSnapContext
{
Enabled = SnappingEnabled,
};
geim.SnapContext = graphSnapContext;
geim.LabelSnapContext = labelSnapContext;
}
}
private void OnLoaded(object source, EventArgs args)
{
snapContext = new GraphSnapContext();
// intialize input mode
graphEditorInputMode = new GraphEditorInputMode()
{
AllowGroupingOperations = true,
OrthogonalEdgeEditingContext = new OrthogonalEdgeEditingContext(),
SnapContext = snapContext
};
GraphControl.InputMode = graphEditorInputMode;
GraphControl.Graph.GetDecorator().EdgeDecorator.EdgeReconnectionPortCandidateProviderDecorator.SetImplementation(
edge => true, EdgeReconnectionPortCandidateProviders.AllNodeCandidates);
// initialize grid
this.gridInfo = new GridInfo {
HorizontalSpacing = 30, VerticalSpacing = 30
};
grid = new GridVisualCreator(gridInfo);
GraphControl.BackgroundGroup.AddChild(grid);
snapContext.NodeGridConstraintProvider = new GridConstraintProvider <INode>(gridInfo);
snapContext.BendGridConstraintProvider = new GridConstraintProvider <IBend>(gridInfo);
// initialize current values
OnSnappingChanged(this, null);
OnGridHorizontalWidthChanged(this, null);
OnGridVerticalWidthChanged(this, null);
GraphControl.Invalidate();
GraphControl.ZoomChanged += delegate { UpdateGrid(); };
GraphControl.ViewportChanged += delegate { UpdateGrid(); };
InitializeGraph();
}
protected override void CollectGridSnapResults(GraphSnapContext context, CollectSnapResultsEventArgs args, RectD suggestedLayout, INode node)
{
AddGridSnapResult(context, args, suggestedLayout.GetTopLeft(), node);
}
