public override void OnMouseUp(RichPictureBox richPictureBox, MouseEventArgs e)
{
if (cancelNewFlag)
{
cancelNewFlag = false;
return;
}
// if new object creation is canceled
if (!richPictureBox.CreatingDrawObject && newPolyLine != null)
{
return;
}
if (newPolyLine == null)
{
Point point = new Point((int)(e.X / richPictureBox.Zoom - richPictureBox.OffsetX), (int)(e.Y / richPictureBox.Zoom - richPictureBox.OffsetY));
newPolyLine = new DrawPolyLine(richPictureBox, point.X, point.Y, point.X + 1, point.Y + 1);
AddNewObject(richPictureBox, newPolyLine);
}
else
{
// polygon gate should have at least 3 points
if (newPolyLine.CloseToFirstPoint(e.Location) && newPolyLine.PointCount > 3)
{
newPolyLine.RemovePointAt(newPolyLine.PointCount - 1); // remove the last added point, it is closed to first
EndCreating(richPictureBox);
return;
}
// Drawing is in process, so simply add a new point
Point point = e.Location;
newPolyLine.AddPoint(richPictureBox, point, true);
}
richPictureBox.Capture = false;
richPictureBox.Invalidate();
}
public override void OnCancel(RichPictureBox richPictureBox, bool cancelSelection)
{
base.OnCancel(richPictureBox, cancelSelection);
newPolyLine = null;
}
private void EndCreating(RichPictureBox richPictureBox)
{
newPolyLine.Creating = false;
newPolyLine = null;
}