使用纹理画笔时，线条的粗细看起来不规则

>我打算使用纹理画笔绘制相同粗细的线条。然而，线条的粗细看起来不规则。

如果可以的话，我不想停止绘制 0.1 毫米单位。因为用户的代码几乎完成了。

如果您有想法，我将不胜感激。

显示的线条

    //Brush User's Code
    private void pictureBox1_Paint(object sender, PaintEventArgs e)
    {
        // I need to draw by 0.1mm unit like CAD.
        e.Graphics.PageUnit = GraphicsUnit.Millimeter;
        e.Graphics.PageScale = 0.1F;
        Point leftTop = new Point(2, 2);
        using(TextureBrush aBrush = myBrush()){
            aBrush.TranslateTransform(leftTop.X, leftTop.Y);
            e.Graphics.FillRectangle(aBrush, leftTop.X,leftTop.Y, 90, 1000);
        }
    }
    //BrushMaker Code
    private  TextureBrush myBrush()
    {
        Bitmap bitmapCanvas = new Bitmap(20, 10);
        Graphics g = Graphics.FromImage(bitmapCanvas);
        Pen myPen = new Pen(Brushes.Black, 2F);
        g.DrawLine(myPen, 2, 5, 18, 5);
        var brush = new TextureBrush(bitmapCanvas);
        myPen.Dispose();
        g.Dispose();
        bitmapCanvas.Dispose();
        return brush;
    }