How to draw a rectangle on a WPF canvas

How to draw a rectangle on a WPF canvas

To draw a rectangle on a WPF canvas, you can create an instance of the Rectangle class and set its properties, then add it to the canvas using the Children property.

Here's an example:

<Canvas Name="myCanvas" Width="400" Height="400"/>

In this example, we define a Canvas element with a Name of myCanvas and a Width and Height of 400.

using System.Windows.Media; using System.Windows.Shapes; public class Program { static void Main() { // Create a rectangle Rectangle rectangle = new Rectangle { Width = 100, Height = 50, Fill = Brushes.Blue, Stroke = Brushes.Black, StrokeThickness = 2 }; // Add the rectangle to the canvas myCanvas.Children.Add(rectangle); // Position the rectangle Canvas.SetLeft(rectangle, 50); Canvas.SetTop(rectangle, 50); } }

In this example, we create a Rectangle object and set its properties using object initializer syntax. We set the Width and Height properties to 100 and 50, respectively, and set the Fill property to Brushes.Blue, the Stroke property to Brushes.Black, and the StrokeThickness property to 2.

We then add the Rectangle object to the Children property of the Canvas object using the Add method.

Finally, we use the Canvas.SetLeft and Canvas.SetTop methods to position the rectangle on the canvas.

When you run this code, it will draw a blue rectangle with a black border on the canvas, positioned at (50, 50).

Examples

  1. "Draw a basic rectangle on WPF canvas"

    • Code:
      <Canvas Name="myCanvas" Background="White"> <Rectangle Width="100" Height="50" Fill="Blue" Canvas.Left="50" Canvas.Top="50"/> </Canvas>
      • Description: This XAML code creates a WPF Canvas with a blue rectangle positioned at (50, 50) with a width of 100 and height of 50.

  2. "WPF canvas rectangle with border"

    • Code:
      <Canvas Name="myCanvas" Background="White"> <Rectangle Width="100" Height="50" Fill="Blue" Stroke="Black" StrokeThickness="2" Canvas.Left="50" Canvas.Top="50"/> </Canvas>
      • Description: This XAML code adds a black border to the blue rectangle with a stroke thickness of 2.

  3. "Draw a rounded rectangle on WPF canvas"

    • Code:
      <Canvas Name="myCanvas" Background="White"> <Rectangle Width="100" Height="50" Fill="Blue" Stroke="Black" StrokeThickness="2" RadiusX="10" RadiusY="10" Canvas.Left="50" Canvas.Top="50"/> </Canvas>
      • Description: This XAML code creates a rounded rectangle with a corner radius of 10.

  4. "WPF canvas rectangle with mouse interaction"

    • Code:
      <Canvas Name="myCanvas" Background="White" MouseLeftButtonDown="Canvas_MouseLeftButtonDown"> <Rectangle Width="100" Height="50" Fill="Blue" Stroke="Black" StrokeThickness="2" Canvas.Left="50" Canvas.Top="50"/> </Canvas> 
      private void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { // Handle mouse click on the rectangle }
      • Description: This code adds a mouse click event handler to the canvas for interaction with the rectangle.

  5. "WPF canvas rectangle with resizing handles"

    • Code:
      <Canvas Name="myCanvas" Background="White" MouseLeftButtonDown="Canvas_MouseLeftButtonDown"> <Rectangle x:Name="myRectangle" Width="100" Height="50" Fill="Blue" Stroke="Black" StrokeThickness="2" Canvas.Left="50" Canvas.Top="50"/> </Canvas> 
      private void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { // Implement resizing handles logic (e.g., using adorners) }
      • Description: This code sets up the canvas with a rectangle, and you can implement resizing handles using adorners or other techniques.

  6. "WPF canvas rectangle animation"

    • Code:
      <Canvas Name="myCanvas" Background="White"> <Rectangle x:Name="myRectangle" Width="100" Height="50" Fill="Blue" Stroke="Black" StrokeThickness="2" Canvas.Left="50" Canvas.Top="50"> <Rectangle.Triggers> <EventTrigger RoutedEvent="Loaded"> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetProperty="Width" To="200" Duration="0:0:2"/> <DoubleAnimation Storyboard.TargetProperty="Height" To="100" Duration="0:0:2"/> </Storyboard> </BeginStoryboard> </EventTrigger> </Rectangle.Triggers> </Rectangle> </Canvas>
      • Description: This XAML code adds an animation to the rectangle, causing it to change size over a 2-second duration when the canvas is loaded.

  7. "WPF canvas rectangle with drag and drop"

    • Code:
      <Canvas Name="myCanvas" Background="White" MouseLeftButtonDown="Rectangle_MouseLeftButtonDown" MouseMove="Rectangle_MouseMove" MouseLeftButtonUp="Rectangle_MouseLeftButtonUp"> <Rectangle x:Name="myRectangle" Width="100" Height="50" Fill="Blue" Stroke="Black" StrokeThickness="2" Canvas.Left="50" Canvas.Top="50"/> </Canvas> 
      private bool isDragging = false; private Point offset; private void Rectangle_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { isDragging = true; offset = e.GetPosition(myRectangle); } private void Rectangle_MouseMove(object sender, MouseEventArgs e) { if (isDragging) { Point mousePos = e.GetPosition(myCanvas); Canvas.SetLeft(myRectangle, mousePos.X - offset.X); Canvas.SetTop(myRectangle, mousePos.Y - offset.Y); } } private void Rectangle_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { isDragging = false; }
      • Description: This code enables dragging and dropping of the rectangle within the canvas.

  8. "WPF canvas rectangle with context menu"

    • Code:
      <Canvas Name="myCanvas" Background="White"> <Rectangle Width="100" Height="50" Fill="Blue" Stroke="Black" StrokeThickness="2" Canvas.Left="50" Canvas.Top="50"> <Rectangle.ContextMenu> <ContextMenu> <MenuItem Header="Delete" Click="DeleteMenuItem_Click"/> </ContextMenu> </Rectangle.ContextMenu> </Rectangle> </Canvas> 
      private void DeleteMenuItem_Click(object sender, RoutedEventArgs e) { myCanvas.Children.Remove(myRectangle); }
      • Description: This code adds a context menu to the rectangle, allowing the user to delete it.

  9. "WPF canvas rectangle with dynamic creation"

    • Code:
      <Canvas Name="myCanvas" Background="White" MouseLeftButtonDown="Canvas_MouseLeftButtonDown"> <!-- No initial rectangle in XAML --> </Canvas> 
      private void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { Rectangle newRectangle = new Rectangle { Width = 100, Height = 50, Fill = Brushes.Green, Stroke = Brushes.Black, StrokeThickness = 2 }; Canvas.SetLeft(newRectangle, e.GetPosition(myCanvas).X); Canvas.SetTop(newRectangle, e.GetPosition(myCanvas).Y); myCanvas.Children.Add(newRectangle); }
      • Description: This code dynamically creates a rectangle on the canvas when the user clicks, allowing for the dynamic addition of rectangles.

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