public void AddViewBoxTransform(BoxRegion region, AspectRatio aspectRatio, SVGSVGElement frag)
{
// Get the tags computed style:
Css.ComputedStyle tagStyle = (frag == null) ? null : frag.Style.Computed;
float x = (tagStyle == null ? 0 : tagStyle.OffsetLeft);
float y = (tagStyle == null ? 0 : tagStyle.OffsetTop);
if (region.IsEmpty)
{
PushMatrix(TranslateMatrix(x, y));
return;
}
float width = (tagStyle == null ? region.Width : tagStyle.PixelWidth);
float height = (tagStyle == null ? region.Height : tagStyle.PixelHeight);
float fScaleX = width / region.Width;
float fScaleY = height / region.Height; //(this.MinY < 0 ? -1 : 1) *
float fMinX = -region.X * fScaleX;
float fMinY = -region.Y * fScaleY;
if (aspectRatio == null)
{
aspectRatio = new AspectRatio(SVGPreserveAspectRatio.xMidYMid, false);
}
if (aspectRatio.Align != SVGPreserveAspectRatio.none)
{
if (aspectRatio.Slice)
{
fScaleX = (float)Math.Max(fScaleX, fScaleY);
fScaleY = (float)Math.Max(fScaleX, fScaleY);
}
else
{
fScaleX = (float)Math.Min(fScaleX, fScaleY);
fScaleY = (float)Math.Min(fScaleX, fScaleY);
}
float fViewMidX = (region.Width / 2) * fScaleX;
float fViewMidY = (region.Height / 2) * fScaleY;
float fMidX = width / 2;
float fMidY = height / 2;
fMinX = -region.X * fScaleX;
fMinY = -region.Y * fScaleY;
switch (aspectRatio.Align)
{
case SVGPreserveAspectRatio.xMinYMin:
break;
case SVGPreserveAspectRatio.xMidYMin:
fMinX += fMidX - fViewMidX;
break;
case SVGPreserveAspectRatio.xMaxYMin:
fMinX += width - region.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 - region.Width * fScaleX;
fMinY += fMidY - fViewMidY;
break;
case SVGPreserveAspectRatio.xMinYMax:
fMinY += height - region.Height * fScaleY;
break;
case SVGPreserveAspectRatio.xMidYMax:
fMinX += fMidX - fViewMidX;
fMinY += height - region.Height * fScaleY;
break;
case SVGPreserveAspectRatio.xMaxYMax:
fMinX += width - region.Width * fScaleX;
fMinY += height - region.Height * fScaleY;
break;
default:
break;
}
}
// Clip now:
SetClip(new BoxRegion(x, y, width, height), false);
Matrix4x4 matrix = ScaleMatrix(fScaleX, fScaleY);
matrix *= TranslateMatrix(x, y);
matrix *= TranslateMatrix(fMinX, fMinY);
// Push it:
PushMatrix(matrix);
}
