public void Draw(GraphRendererContext rendererContext, GraphCamera camera)
{
if (!active)
{
return;
}
var mouseWorld = camera.ScreenToWorld(mouseScreenPosition);
mousePin.Position = mouseWorld;
GraphLinkRenderer.DrawGraphLink(rendererContext, link, camera);
// Check the pin that comes under the mouse pin
var targetPin = graphEditor.GetPinUnderPosition(mouseWorld);
if (targetPin != null)
{
var sourcePin = attachedPin;
var pins = new GraphPin[] { sourcePin, targetPin };
Array.Sort(pins, new GraphPinHierarchyComparer());
string errorMessage;
if (!GraphSchema.CanCreateLink(pins[0], pins[1], out errorMessage))
{
GraphTooltip.message = errorMessage;
}
}
}
/// <summary>
/// Creates a graph link between the two specified pins
/// </summary>
/// <typeparam name="T">The type of the link. Should be GraphLink or one of its subclass</typeparam>
/// <param name="output">The output pin from where the link originates</param>
/// <param name="input">The input pin, where the link points to</param>
/// <returns></returns>
public static T CreateLink <T>(Graph graph, GraphPin output, GraphPin input) where T : GraphLink
{
// Make sure the pin types are correct
if (output.PinType != GraphPinType.Output || input.PinType != GraphPinType.Input)
{
throw new System.ApplicationException("Invalid pin types while creating a link");
}
if (!GraphSchema.CanCreateLink(output, input))
{
return(null);
}
// Make sure a link doesn't already exists
foreach (T link in graph.Links)
{
if (link.Input == input && link.Output == output)
{
return(link);
}
}
{
Undo.RecordObject(graph, "Create Link");
T link = CreateLink <T>(graph);
link.Input = input;
link.Output = output;
Undo.RegisterCreatedObjectUndo(link, "Create Link");
return(link);
}
}