Svg.SvgViewBox.AddViewBoxTransform C# (CSharp) Method

        public void AddViewBoxTransform(SvgAspectRatio aspectRatio, ISvgRenderer renderer, SvgFragment frag)
        {
            var x = (frag == null ? 0 : frag.X.ToDeviceValue(renderer, UnitRenderingType.Horizontal, frag));
            var y = (frag == null ? 0 : frag.Y.ToDeviceValue(renderer, UnitRenderingType.Vertical, frag));

            if (this.Equals(SvgViewBox.Empty))
            {
                renderer.TranslateTransform(x, y, MatrixOrder.Prepend);
                return;
            }

            var width = (frag == null ? this.Width : frag.Width.ToDeviceValue(renderer, UnitRenderingType.Horizontal, frag));
            var height = (frag == null ? this.Height : frag.Height.ToDeviceValue(renderer, UnitRenderingType.Vertical, frag));

            var fScaleX = width / this.Width;
            var fScaleY = height / this.Height; //(this.MinY < 0 ? -1 : 1) *
            var fMinX = -this.MinX * fScaleX;
            var fMinY = -this.MinY * fScaleY;

            if (aspectRatio == null) aspectRatio = new SvgAspectRatio(SvgPreserveAspectRatio.xMidYMid, false);
            if (aspectRatio.Align != SvgPreserveAspectRatio.none)
            {
                if (aspectRatio.Slice)
                {
                    fScaleX = Math.Max(fScaleX, fScaleY);
                    fScaleY = Math.Max(fScaleX, fScaleY);
                }
                else
                {
                    fScaleX = Math.Min(fScaleX, fScaleY);
                    fScaleY = Math.Min(fScaleX, fScaleY);
                }
                float fViewMidX = (this.Width / 2) * fScaleX;
                float fViewMidY = (this.Height / 2) * fScaleY;
                float fMidX = width / 2;
                float fMidY = height / 2;
                fMinX = -this.MinX * fScaleX;
                fMinY = -this.MinY * fScaleY;

                switch (aspectRatio.Align)
                {
                    case SvgPreserveAspectRatio.xMinYMin:
                        break;
                    case SvgPreserveAspectRatio.xMidYMin:
                        fMinX += fMidX - fViewMidX;
                        break;
                    case SvgPreserveAspectRatio.xMaxYMin:
                        fMinX += width - this.Width * fScaleX;
                        break;
                    case SvgPreserveAspectRatio.xMinYMid:
                        fMinY += fMidY - fViewMidY;
                        break;
                    case SvgPreserveAspectRatio.xMidYMid:
                        fMinX += fMidX - fViewMidX;
                        fMinY += fMidY - fViewMidY;
                        break;
                    case SvgPreserveAspectRatio.xMaxYMid:
                        fMinX += width - this.Width * fScaleX;
                        fMinY += fMidY - fViewMidY;
                        break;
                    case SvgPreserveAspectRatio.xMinYMax:
                        fMinY += height - this.Height * fScaleY;
                        break;
                    case SvgPreserveAspectRatio.xMidYMax:
                        fMinX += fMidX - fViewMidX;
                        fMinY += height - this.Height * fScaleY;
                        break;
                    case SvgPreserveAspectRatio.xMaxYMax:
                        fMinX += width - this.Width * fScaleX;
                        fMinY += height - this.Height * fScaleY;
                        break;
                    default:
                        break;
                }
            }

            renderer.SetClip(new Region(new RectangleF(x, y, width, height)), CombineMode.Intersect);
            renderer.TranslateTransform(x, y, MatrixOrder.Prepend);
            renderer.TranslateTransform(fMinX, fMinY, MatrixOrder.Prepend);
            renderer.ScaleTransform(fScaleX, fScaleY, MatrixOrder.Prepend);
        }