Rect.Left Rect.Left Rect.Left Rect.Left Property

Definizione

Ottiene il valore dell'asse x del lato sinistro del rettangolo.Gets the x-axis value of the left side of the rectangle.

public:
 property double Left { double get(); };
public double Left { get; }
member this.Left : double
Public ReadOnly Property Left As Double

Valore della proprietà

Valore dell'asse x del lato sinistro del rettangolo.The x-axis value of the left side of the rectangle.

Esempi

Nell'esempio seguente viene illustrato come utilizzare il codice per creare un rettangolo e aggiungerlo alla pagina.The following example shows how to use code to create a rectangle and add it to the page. Nell'esempio viene inoltre illustrato come trovare le informazioni sulle dimensioni e le coordinate relative al nuovo rettangolo ed eseguire il rendering TextBox delle informazioni in un oggetto sotto il rettangolo.The example also illustrates how to find size and coordinate information about the new rectangle and render the information in a TextBox below the rectangle.

// Create a rectangle and add it to the page. Also,
// find size and coordinate information about this
// new rectangle and render information in a TextBox 
// below the rectangle.
private StackPanel createRectExample1()
{
    // Initialize new rectangle.
    Rect myRectangle = new Rect();

    // The Location property specifies the coordinates of the upper left-hand 
    // corner of the rectangle. Set the Location property to an X coordinate of 10 and a
    // Y coordinate of 5. 
    myRectangle.Location = new Point(10, 5);

    // Set the Size property of the rectangle with a width of 200
    // and a height of 50.
    myRectangle.Size = new Size(200, 50);

    RectangleGeometry myRectangleGeometry = new RectangleGeometry();
    myRectangleGeometry.Rect = myRectangle;

    // This path is defined by the rectangle.
    Path myPath = new Path();
    myPath.Fill = Brushes.LemonChiffon;
    myPath.Stroke = Brushes.Black;
    myPath.StrokeThickness = 1;
    myPath.Data = myRectangleGeometry;

    //////////// Create string of rectangle property information /////////////
    // This string will contain all the size and coordinate property
    // information about the rectangle.
    /////////////////////////////////////////////////////////////////////////
    string rectInfo = "Rectangle Property Information: ";

    // Bottom property gets the y-axis value of the bottom of the rectangle. 
    // For this rectangle the value is 55.
    rectInfo = rectInfo + "Bottom: " + myRectangle.Bottom;

    // BottomLeft property gets the coordinates of the bottom left corner of the rectangle. 
    // For this rectangle the value is 10,55.
    rectInfo = rectInfo + "| BottomLeft: " + myRectangle.BottomLeft;

    // BottomRight property gets the coordinates of the bottom right corner of the rectangle. 
    // For this rectangle the value is 210,55.
    rectInfo = rectInfo + "| BottomRight: " + myRectangle.BottomRight;

    // Height property gets or sets the height of the rectangle. 
    // For this rectangle the value is 50.
    rectInfo = rectInfo + "| Height: " + myRectangle.Height;

    // Width property gets or sets the width of the rectangle. 
    // For this rectangle the value is 200.
    rectInfo = rectInfo + "| Width: " + myRectangle.Width;

    // Left property gets the x-axis position of the left side of the rectangle which is 
    // equivalent to getting the rectangle's X property. 
    // For this rectangle the value is 10.
    rectInfo = rectInfo + "| Left: " + myRectangle.Left;

    // Location property gets or sets the position of the rectangle's top-left corner.
    // For this rectangle the value is 10,5.
    rectInfo = rectInfo + "| Location: " + myRectangle.Location;

    // Right property gets the x-axis value of the right side of the rectangle. 
    // For this rectangle the value is 210.
    rectInfo = rectInfo + "| Right: " + myRectangle.Right;

    // Size property gets or sets the width and height of the rectangle.  
    // For this rectangle the value is 200,50.
    rectInfo = rectInfo + "| Size: " + myRectangle.Size;

    // Top property gets the y-axis position of the top of the rectangle which is 
    // equivalent to getting the rectangle's Y property.
    // For this rectangle the value is 5.
    rectInfo = rectInfo + "| Top: " + myRectangle.Top;

    // TopLeft property gets the position of the top-left corner of the rectangle, which 
    // is equivalent to (X, Y).   
    // For this rectangle the value is 10,5.
    rectInfo = rectInfo + "| TopLeft: " + myRectangle.TopLeft;

    // TopRight property gets the position of the top-left corner of the rectangle, which 
    // is equivalent to (X + Width, Y).   
    // For this rectangle the value is 210,5.
    rectInfo = rectInfo + "| TopRight: " + myRectangle.TopRight;

    // X property gets or sets the location of the rectangle's left side.  
    // For this rectangle the value is 10.
    rectInfo = rectInfo + "| X: " + myRectangle.X;

    // Y property gets or sets the location of the rectangle's top side.  
    // For this rectangle the value is 5.
    rectInfo = rectInfo + "| Y: " + myRectangle.Y;

    //////// End of creating string containing rectangle property information ////////

    // This StackPanel will contain the rectangle and TextBlock.
    StackPanel parentPanel = new StackPanel();

    // Add the rectangle path to the StackPanel. This will display the rectangle.
    parentPanel.Children.Add(myPath);

    // Add a TextBlock to display the rectangle's size and coordinate information.
    TextBlock myTextBlock = new TextBlock();
    myTextBlock.Text = rectInfo;
    parentPanel.Children.Add(myTextBlock);

    // Return the parent container to be displayed to the screen.
    return parentPanel;
}

Commenti

Ottenere questa proprietà equivale a ottenere la X proprietà.Getting this property is equivalent to getting the X property.

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