void arrow_MouseLeave(object sender, MouseEventArgs e)
{
ChangeArrow = sender as ClassLibrary_Graph.Arrow;
ChangeArrow = null;
if (IsInArrow)
{
IsInArrow = false;
}
}
//点击左键，定义圆的圆心并绘制
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
//执行基本的方法
base.OnMouseLeftButtonDown(e);
//连箭头
if (IsInGrid == true)
{
arrow = new ClassLibrary_Graph.Arrow();
arrow.HeadHeight = 10;
arrow.HeadWidth = 10;
arrow.Stroke = Brushes.Black;
arrow.StrokeThickness = 3;
arrow.Tail = ChangeGrid.Name;
arrow.X1 = Canvas.GetLeft(ChangeGrid) + ChangeGrid.Width / 2;//箭尾为所在圆的圆心
arrow.Y1 = Canvas.GetTop(ChangeGrid) + ChangeGrid.Height / 2;
//添加路由事件
arrow.MouseEnter += new MouseEventHandler(arrow_MouseEnter);
arrow.MouseLeave += new MouseEventHandler(arrow_MouseLeave);
IsConnecting = true;
IsSettingArrow = true;
return;
}
//对箭头进行左击，不添加新圆
if (IsInArrow == true)
{
return;
}
//创建一个grid对象，存放圆与标签
grid = new Grid();
grid.Width = 40;
grid.Height = 40;
ptcenter = e.GetPosition(this.GraphShowCanvas);//返回相对canvas的点位置
grid.Name = pointNames[pointNamesNum];
//创建一个Ellipse对象，并且把它加入到grid中
elips = new Ellipse();//新建一个椭圆对象
elips.Stroke = SystemColors.WindowTextBrush;
elips.Width = 40;
elips.Height = 40;//固定直径为40
elips.Fill = Brushes.White;
grid.Children.Add(elips);
//创建一个label对象，并把它加入grid中
label = new Label();
label.Content = pointNames[pointNamesNum++];
label.HorizontalAlignment = HorizontalAlignment.Center;//居中
label.VerticalAlignment = VerticalAlignment.Center;
grid.Children.Add(label);
//添加路由事件
grid.MouseEnter += new MouseEventHandler(grid_MouseEnter);
grid.MouseLeave += new MouseEventHandler(grid_MouseLeave);
grid.MouseRightButtonDown += new MouseButtonEventHandler(grid_MouseRightButtonDown);
//grid添加到Canvas和gridDic和Graph中
this.GraphShowCanvas.Children.Add(grid);
gridDic.Add(grid.Name, grid);
Panel.SetZIndex(grid, 1);
Canvas.SetLeft(grid, ptcenter.X - grid.Width / 2);//ptcenter的(x,y)为elips的圆心坐标
Canvas.SetTop(grid, ptcenter.Y - grid.Height / 2);
ClassLibrary_Graph.Node <string> node = new ClassLibrary_Graph.Node <string>(label.Content.ToString());
graph.SetNode(node);
//获取鼠标，即使鼠标离开区域也可获取鼠标消息
CaptureMouse();
IsDrawing = true;
}
void arrow_MouseEnter(object sender, MouseEventArgs e)
{
ChangeArrow = sender as ClassLibrary_Graph.Arrow;
IsInArrow = true;
}
