How-to-get-text-drawing-font

I would like to calculate the pixel width of the text being rendered.
Is there a way to obtain the font information for drawing functions?

I want to draw a text to be left edge aligned at the last bar of the chart.
Something lie this:

CODE:
Font font = GetTextDrawingFont();
Size size = System.Windows.Forms.TextRenderer.MeasureText(text, font);
DrawTextVAlign(text, idx, bars.High[idx], VerticalAlignment.Top, WLColor.Red, font.Size, 0, -1 * size);