QuickFont.QFont.OrthogonalTransform C# (CSharp) Method

        private static TransformViewport OrthogonalTransform(out float fontScale)
        {
            bool isOrthog;
            float left,right,bottom,top;
            ProjectionStack.GetCurrentOrthogProjection(out isOrthog,out left,out right,out bottom,out top);

            if (!isOrthog)
                throw new ArgumentOutOfRangeException("Current projection matrix was not Orthogonal. Please ensure that you have set an orthogonal projection before attempting to create a font with the TransformToOrthogProjection flag set to true.");

            var viewportTransform = new TransformViewport(left, top, right - left, bottom - top);
            fontScale = Math.Abs((float)ProjectionStack.CurrentViewport.Value.Height / viewportTransform.Height);
            return viewportTransform;
        }

        public static QFont FromQFontFile(string filePath, float downSampleFactor, QFontLoaderConfiguration loaderConfig = null, ProjectionStack proj = null)
        {
            if (loaderConfig == null)
                loaderConfig = new QFontLoaderConfiguration();

            QFont qfont = new QFont();
            if (proj != null)
                qfont.ProjectionStack = proj;

            TransformViewport? transToVp = null;
            float fontScale = 1f;
            if (loaderConfig.TransformToCurrentOrthogProjection)
                transToVp = qfont.OrthogonalTransform(out fontScale);

            qfont.fontData = Builder.LoadQFontDataFromFile(filePath, downSampleFactor * fontScale, loaderConfig);

            if (loaderConfig.ShadowConfig != null)
                qfont.Options.DropShadowActive = true;
            if (transToVp != null)
                qfont.Options.TransformToViewport = transToVp;

            return qfont;
        }