我需要帮助在符合像素边界的WPF DrawingContext上绘制网格

Question

我正在尝试在物理设备像素边界上绘制网格，但它无法正常工作。要获取随附的示例代码，第一行是左边的一个像素，第二行是右边的一个像素等等。我想在没有96像素到英寸的设备上生成像素完美的网格。在这方面的任何帮助将不胜感激....

protected override void OnRender(DrawingContext drawingContext)
{
    base.OnRender(drawingContext);

    var  m = PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice;

    double dpiFactor = 1 / m.M11;

    var pen = new Pen(Brushes.Black, 1 * dpiFactor);

    double halfPenWidth = pen.Thickness / 2.0;

    for (int x = 1; x <= Consts.GridSize - 1; x++)
    {
        var p1 = new Point(Consts.CellSize * x, 0);
        var p2 = new Point(Consts.CellSize * x, Height - 1);

        var rect = new Rect(p1, p2);

        var guidelines = new GuidelineSet();

        guidelines.GuidelinesX.Add(rect.Left + halfPenWidth);
        guidelines.GuidelinesX.Add(rect.Right + halfPenWidth);
        guidelines.GuidelinesY.Add(rect.Top + halfPenWidth);
        guidelines.GuidelinesY.Add(rect.Bottom + halfPenWidth);

        drawingContext.PushGuidelineSet(guidelines);
        drawingContext.DrawRectangle(null, pen, rect);
        //drawingContext.DrawLine(pen, p1, p2);
        drawingContext.Pop();
    }
}