/// <summary>
/// 判断界面上的一个点是否在矩形内
/// </summary>
/// <param name="point"></param>
/// <param name="uc"></param>
/// <returns></returns>
private bool IsPointInRect(Point point, UCRectBorder uc)
{
if (point.X >= uc.StartPoint.X &&
point.X <= uc.EndPoint.X &&
point.Y >= uc.StartPoint.Y &&
point.Y <= uc.EndPoint.Y
)
{
return(true);
}
else
{
return(false);
}
}
private void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var sPoint = e.GetPosition(canvasPanel);
if (_isAdd)
{ //添加矩形
var uc = new UCRectBorder();
//默认长宽为20的矩形，否则用户按下鼠标左键后看不到矩形
uc.StartPoint = new Point(sPoint.X - 20, sPoint.Y - 20);
uc.EndPoint = new Point(sPoint.X, sPoint.Y);
uc.MouseDoubleClick += (o, s) =>
{
//若已选择则取消选择
if (SelectedRect == uc && SelectedRect.IsSelected == true)
{
SelectedRect.IsSelected = false;
}
else
{
SelectedRect = uc;
SelectedRect.IsSelected = true;
}
};
canvasPanel.Children.Add(uc);
SelectedRect = uc;
//刚添加时默认移动矩形右下角
_operateStatus = OperateStatus.RightBottom;
_tmpRect = new Rect(SelectedRect.StartPoint, SelectedRect.EndPoint);
}
else if (SelectedRect != null && IsPointInRect(sPoint, SelectedRect))
{//编辑矩形
_downPoint = sPoint;
if (SelectedRect.Cursor != Cursors.Arrow)
{
_tmpRect = new Rect(SelectedRect.StartPoint, SelectedRect.EndPoint);
var point = e.GetPosition(SelectedRect);
if (SelectedRect.Cursor == Cursors.SizeAll)
{//移动
_operateStatus = OperateStatus.Move;
}
else if (SelectedRect.Cursor == Cursors.SizeNS)
{//上下
if (point.Y < SelectedRect.ActualHeight / 2)
{
_operateStatus = OperateStatus.Top;
}
else
{
_operateStatus = OperateStatus.Bottom;
}
}
else if (SelectedRect.Cursor == Cursors.SizeWE)
{//左右
if (point.X < SelectedRect.ActualWidth / 2)
{
_operateStatus = OperateStatus.Left;
}
else
{
_operateStatus = OperateStatus.Right;
}
}
else if (SelectedRect.Cursor == Cursors.SizeNWSE)
{//左上 右下
if (point.X < SelectedRect.ActualWidth / 2)
{
_operateStatus = OperateStatus.LeftTop;
}
else
{
_operateStatus = OperateStatus.RightBottom;
}
}
else if (SelectedRect.Cursor == Cursors.SizeNESW)
{//左下 右上
if (point.X < SelectedRect.ActualWidth / 2)
{
_operateStatus = OperateStatus.LeftBottom;
}
else
{
_operateStatus = OperateStatus.RightTop;
}
}
}
else
{
_operateStatus = OperateStatus.None;
}
}
}