CraftSynth.ImageEditor – Rev 1
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using System.Drawing;
using System.Windows.Forms;
namespace CraftSynth.ImageEditor
{
/// <summary>
/// Connector tool (a Connector is a series of connected straight lines where each line is drawn individually and at least one of the ends is anchored to another object)
/// </summary>
internal class ToolConnector : ToolObject
{
public ToolConnector()
{
Cursor = new Cursor(GetType(), "Pencil.cur");
}
private DrawConnector newConnector;
private bool _drawingInProcess = false; // Set to true when drawing
/// <summary>
/// Left mouse button is pressed
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
_drawingInProcess = false;
newConnector = null;
} else
{
Point p = drawArea.BackTrackMouse(new Point(e.X, e.Y));
int objectID = -1;
p = TestForConnection(drawArea, p, out objectID);
if (_drawingInProcess == false)
{
newConnector = new DrawConnector(p.X, p.Y, p.X + 1, p.Y + 1, drawArea.LineColor, drawArea.LineWidth, drawArea.PenType, drawArea.EndCap);
newConnector.EndPoint = new Point(p.X + 1, p.Y + 1);
if (objectID > -1)
{
newConnector.StartIsAnchored = true;
newConnector.StartObjectId = objectID;
}
AddNewObject(drawArea, newConnector);
_drawingInProcess = true;
} else
{
// Drawing is in process, so simply add a new point
newConnector.AddPoint(p);
newConnector.EndPoint = p;
if (objectID > -1)
{
newConnector.EndIsAnchored = true;
newConnector.EndObjectId = objectID;
_drawingInProcess = false;
}
}
}
}
private static Point TestForConnection(DrawArea drawArea, Point p, out int objectID)
{
// Determine if within 5 pixels of a connection point
// Step 1: see if a 5 x 5 rectangle centered on the mouse cursor intersects with an object
// Step 2: If it does, then see if there is a connection point within the rectangle
// Step 3: If there is, move the point to the connection point, record the object's id in the connector
//
objectID = -1;
Rectangle testRectangle = new Rectangle(p.X - 2, p.Y - 2, 5, 5);
int al = drawArea.TheLayers.ActiveLayerIndex;
bool connectionHere = false;
Point h = new Point(-1, -1);
GraphicsList gl = drawArea.TheLayers[al].Graphics;
for (int i = 1; i < gl.Count; i++)
{
if (gl[i].IntersectsWith(testRectangle))
{
DrawObject obj = (DrawObject)gl[i];
for (int j = 1; j < obj.HandleCount + 1; j++)
{
h = obj.GetHandle(j);
if (testRectangle.Contains(h))
{
connectionHere = true;
p = h;
objectID = obj.ID;
// obj.DrawConnection(drawArea., j);
break;
}
}
}
if (connectionHere)
break;
}
return p;
}
/// <summary>
/// Mouse move - resize new polygon
/// </summary>
/// <param name="drawArea"></param>
/// <param name="e"></param>
public override void OnMouseMove(DrawArea drawArea, MouseEventArgs e)
{
drawArea.Cursor = Cursor;
if (e.Button !=
MouseButtons.Left)
return;
if (newConnector == null)
return; // precaution
Point point = drawArea.BackTrackMouse(new Point(e.X, e.Y));
int objectID;
point = TestForConnection(drawArea, point, out objectID);
// move last point
newConnector.MoveHandleTo(point, newConnector.HandleCount);
drawArea.Refresh();
if (objectID > -1)
{
newConnector.EndIsAnchored = true;
newConnector.EndObjectId = objectID;
_drawingInProcess = false;
}
}
#region Destruction
private bool _disposed = false;
protected override void Dispose(bool disposing)
{
if (!this._disposed)
{
if (disposing)
{
// Free any managed objects here.
if (this.newConnector != null)
{
this.newConnector.Dispose();
}
}
// Free any unmanaged objects here.
this._disposed = true;
}
base.Dispose(disposing);
}
~ToolConnector()
{
this.Dispose(false);
}
#endregion
}
}
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