/// <span class="code-SummaryComment"><summary></span>
/// Releases the mouse, and raises the CropImage Event
/// <span class="code-SummaryComment"></summary></span>
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonUp(e);
if (this.IsMouseCaptured)
{
DisplayCanvasEventArgs args;
switch (m_mode)
{
case DisplayCanvasModeID.FocusPoint:
args = new DisplayCanvasEventArgs(DisplayCanvasEventID.FocusPointed);
args.clip.X = (int)e.GetPosition(this).X;
args.clip.Y = (int)e.GetPosition(this).Y;
RunEvent(this, args);
break;
case DisplayCanvasModeID.BoxCreate:
args = new DisplayCanvasEventArgs(DisplayCanvasEventID.NodeCreated);
args.clip = rubber.GetClientRect();
args.HasBox = true;
RunEvent(this, args);
break;
case DisplayCanvasModeID.BoxUpdate:
if (anchors.activeAnchorID != AnchorID.None)
{
args = new DisplayCanvasEventArgs(DisplayCanvasEventID.NodeUpdated);
args.clip = rubber.GetClientRect();
args.HasBox = true;
rubber.ReInit(); // Фиксируем изменения рамки
}
else
{
// Нажали мимо рамки - потеря фокуса
args = new DisplayCanvasEventArgs(DisplayCanvasEventID.FocusPointed);
args.clip.X = (int)e.GetPosition(this).X;
args.clip.Y = (int)e.GetPosition(this).Y;
args.HasBox = false;
}
RunEvent(this, args);
break;
case DisplayCanvasModeID.Passive:
case DisplayCanvasModeID.Disabled:
break;
default:
throw new Exception("Unsupported canvas mode detected!");
}
this.ReleaseMouseCapture();
}
}
// Метод обновляет состояние якорей по заданным координатам
// рамки выделения rubber и параметрам мышки e. Следует вызывать
// из обработчика события мыши OnMouseMove().
public void Update(RubberBandManager rubber, Point mousePoint,
bool IsMouseCaptured)
{
// Определяем радиус якорей
System.Drawing.Rectangle clip = rubber.GetClientRect();
if (clip.Width < 15 || clip.Height < 15)
{
m_radius = 2.0;
}
else
{
m_radius = 3.0;
}
// Определяем координаты всех якорей
Point topleft = rubber.currentTopLeftCorner;
Point bottomright = rubber.currentBottomRightCorner;
double widthStep = 0.5 * (bottomright.X - topleft.X);
double heightStep = 0.5 * (bottomright.Y - topleft.Y);
Point center = topleft;
SetAnchorCenter(AnchorID.TopLeft, center);
center.X = topleft.X + widthStep;
center.Y = topleft.Y;
SetAnchorCenter(AnchorID.TopCenter, center);
center.X = topleft.X + 2 * widthStep;
center.Y = topleft.Y;
SetAnchorCenter(AnchorID.TopRight, center);
center.X = topleft.X;
center.Y = topleft.Y + heightStep;
SetAnchorCenter(AnchorID.MiddleLeft, center);
center.X = topleft.X + widthStep;
center.Y = topleft.Y + heightStep;
SetAnchorCenter(AnchorID.MiddleCenter, center);
center.X = topleft.X + 2 * widthStep;
center.Y = topleft.Y + heightStep;
SetAnchorCenter(AnchorID.MiddleRight, center);
center.X = topleft.X;
center.Y = topleft.Y + 2 * heightStep;
SetAnchorCenter(AnchorID.BottomLeft, center);
center.X = topleft.X + widthStep;
center.Y = topleft.Y + 2 * heightStep;
SetAnchorCenter(AnchorID.BottomCenter, center);
center = bottomright;
SetAnchorCenter(AnchorID.BottomRight, center);
// При необходимости обновляем индекс активного якоря
if (!IsMouseCaptured)
{
// Отыскиваем ближайший к указателю мыши якорь
AnchorID nearestID = AnchorID.None;
double nearestDist = 1e6;
foreach (KeyValuePair <AnchorID, Shape> record in m_anchors)
{
center = GetAnchorCenter(record.Key);
double distX = Math.Abs(center.X - mousePoint.X);
double distY = Math.Abs(center.Y - mousePoint.Y);
double dist = Math.Sqrt(distX * distX + distY * distY);
if (dist < nearestDist)
{
nearestDist = dist;
nearestID = record.Key;
}
}
// Сравниваем расстояние до ближайшего якоря с порогом
if (nearestDist < 10)
{
m_activeAnchorID = nearestID;
}
else
{
m_activeAnchorID = AnchorID.None;
}
}
// Обновляем цвета якорей в зависимости от их состояния
foreach (KeyValuePair <AnchorID, Shape> record in m_anchors)
{
Color color;
if (record.Key == m_activeAnchorID)
{
// Активный якорь
color = IsMouseCaptured ? Colors.Blue : Colors.Red;
}
else
{
// Неактивный якорь
color = m_normalColor;
}
record.Value.Stroke = new SolidColorBrush(color);
}
}