我尝试编写自己的自定义 Canvas,并想绘制一个由小矩形组成的小迷宫。我的问题是,我的屏幕上只有 4 个小点,而不是 4 个矩形(尝试使用 2 X 2 字段时)。这是一些代码:
public class LabyrinthCanvas : System.Windows.Controls.Canvas
{
public static readonly int RectRadius = 60;
public ObservableCollection<ObservableCollection<Rect>> Rectangles;
public LabyrinthCanvas()
{
Rectangles = new ObservableCollection<ObservableCollection<Rect>>();
}
public void AddRectangles(int Height, int Width)
{
for (int iHeight = 0; iHeight < Height; iHeight++)
{
ObservableCollection<Rect> newRects = new ObservableCollection<Rect>();
newRects.CollectionChanged += RectanglesChanged;
Rectangles.Add(newRects);
for (int iWidth = 0; iWidth < Width; iWidth++)
{
Rect rect = new Rect(iHeight * RectRadius, iWidth * RectRadius);
Rectangles[iHeight].Add(rect);
}
}
}
public void RectanglesChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
{
foreach (object rect in e.NewItems)
{
if (rect is Rect)
{
this.Children.Add(((Rect)rect).innerRectangle);
System.Windows.Controls.Canvas.SetTop(((Rect)rect).innerRectangle, ((Rect)rect).YPos);
System.Windows.Controls.Canvas.SetLeft(((Rect)rect).innerRectangle, ((Rect)rect).XPos);
}
}
}
else if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Remove)
{
foreach (Rect rect in e.OldItems)
{
this.Children.Remove(rect.innerRectangle);
}
}
}
}
public class Rect : INotifyPropertyChanged
{
public Rect(int YPos, int XPos)
{
innerRectangle.Stroke = System.Windows.Media.Brushes.Black;
innerRectangle.Fill = System.Windows.Media.Brushes.Blue;
this.YPos = YPos;
this.XPos = XPos;
}
public System.Windows.Shapes.Rectangle innerRectangle = new System.Windows.Shapes.Rectangle();
public int YPos;
public int XPos;
}
我认为重要的是:
this.Children.Add(((Rect)rect).innerRectangle);
System.Windows.Controls.Canvas.SetTop(((Rect)rect).innerRectangle, ((Rect)rect).YPos);
System.Windows.Controls.Canvas.SetLeft(((Rect)rect).innerRectangle, ((Rect)rect).XPos);
我使用自己的“矩形”类,因为我需要一些额外的属性,这些属性已从显示的代码中删除,并且无法从 Rectangle 继承。