CODEWITHSUNDEEP
c#drawrectangle
user1007522
user1007522

Reputation: 8118

draw rectangle where cursor is

I'm trying to draw a circle and a rectangle when the mouse is clicked so I got the x and y cords of the mouse click.

I've searched on the internet that in C# this can only be done with Margin, there is no origin or something like in java, you could give x and y to the constructor.

Now I'm trying to set this right but I can't figure out how to calculate this properly:

According to this:

http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.margin%28v=vs.95%29.aspx

rec.Margin = new Thickness(0, 0,0, 0);

Can someone help me? Or is it not possible with this?

Upvotes: 0

Views: 1823

Answers (2)

user1007522
user1007522

Reputation: 8118

void MyCanvas_MouseDown(object sender, MouseButtonEventArgs e)
{
    Point ClickPoint = e.GetPosition(MyCanvas);
    Rectangle Rectangle = new Rectangle();
    System.Windows.Controls.Canvas.SetTop(Rectangle, ClickPoint.Y)
    System.Windows.Controls.Canvas.SetLeft(Rectangle, ClickPoint.X)
    MyCanvas.Children.Add(Rectangle);
}

Thanks to spencer.

Upvotes: 0

Spencer Ruport
Spencer Ruport

Reputation: 35107

Is this WPF or Windows Forms? WPF mouse event args have a GetPosition(UIElement) method which will tell you the mouse coordinates relative to the control you pass in. So if you're trying to draw a rectangle on a System.Windows.Controls.Canvas called MyCanvas you can use the Point returned by e.GetPosition(MyCanvas) to place your rectangle.

Here's an example:

void MyCanvas_MouseDown(object sender, MouseButtonEventArgs e)
{
    Point ClickPoint = e.GetPosition(MyCanvas);
    Rectangle Rectangle = new Rectangle();
    System.Windows.Controls.Canvas.SetTop(Rectangle, ClickPoint.Y)
    System.Windows.Controls.Canvas.SetLeft(Rectangle, ClickPoint.X)
    MyCanvas.Children.Add(Rectangle);
}

Upvotes: 1

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