WPF Canvas - Single Pixel Grid

I have a custom WPF Canvas, upon which I would like to show a grid. I do so by overriding the OnRender method on Canvas, and using the DrawingContext drawing functions. IsGridVis开发者_如何学编程ible, GridWidth, GridHeight are the number of pixels between each grid line horizontally and vertically respectively.

I also use a ScaleTransform on the Canvas.LayoutTransform property to zoom the Canvas items and as one expects, the grid line thicknesses are multiplied by the ScaleTransform scaling factors as shown in the below image. Is there any way to draw single pixel lines, irrespective of the current Canvas RenderTransform?

    protected override void OnRender(System.Windows.Media.DrawingContext dc)
    {
        base.OnRender(dc);

        if (IsGridVisible)
        {
            // Draw GridLines
            Pen pen = new Pen(new SolidColorBrush(GridColour), 1);
            pen.DashStyle = DashStyles.Dash;

            for (double x = 0; x < this.ActualWidth; x += this.GridWidth)
            {
                dc.DrawLine(pen, new Point(x, 0), new Point(x, this.ActualHeight));
            }

            for (double y = 0; y < this.ActualHeight; y += this.GridHeight)
            {
                dc.DrawLine(pen, new Point(0, y), new Point(this.ActualWidth, y));
            }
        }
    }

alt text http://www.freeimagehosting.net/uploads/f05ad1f602.png

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As the comments to the original post state. The Pen thickness should be set to 1.0/zoom.