public SvgRectF GetBounds()
{
var elemWidth = this.Width;
var elemHeight = this.Height;
var isWidthInPerc = elemWidth.BaseVal.UnitType == SvgLengthType.Percentage;
var isHeightInPerc = elemHeight.BaseVal.UnitType == SvgLengthType.Percentage;
SvgRectF bounds = new SvgRectF();
if (isWidthInPerc || isHeightInPerc)
{
var viewRect = this.ViewBox.BaseVal;
if (viewRect.Width > 0 && viewRect.Height > 0)
{
bounds = new SvgRectF((float)viewRect.X, (float)viewRect.Y,
(float)viewRect.Width, (float)viewRect.Height);
}
else
{
bounds = SvgRectF.Empty;//TODO: Recursively computer the bounds?;
}
}
if (bounds.Width.Equals(0.0) && bounds.Height.Equals(0.0))
{
return(SvgRectF.Empty);
}
double width, height;
if (isWidthInPerc)
{
width = (bounds.Width + bounds.X) * elemWidth.BaseVal.ValueInSpecifiedUnits * 0.01;
}
else
{
width = elemWidth.BaseVal.Value;
}
if (isHeightInPerc)
{
height = (bounds.Height + bounds.Y) * elemHeight.BaseVal.ValueInSpecifiedUnits * 0.01;
}
else
{
height = elemHeight.BaseVal.Value;
}
bounds.Width = (float)width;
bounds.Height = (float)height;
return(bounds);
}
private void MapRectToRect(SvgRectF rect, SvgPointF[] plgpts)
{
SvgPointF pt1 = new SvgPointF(plgpts[1].X - plgpts[0].X,
plgpts[1].Y - plgpts[0].Y);
SvgPointF pt2 = new SvgPointF(plgpts[2].X - plgpts[0].X,
plgpts[2].Y - plgpts[0].Y);
this.m11 = pt1.X / rect.Width;
this.m12 = pt1.Y / rect.Width;
this.m21 = pt2.X / rect.Height;
this.m22 = pt2.Y / rect.Height;
this.dx = plgpts[0].X - rect.X / rect.Width * pt1.X - rect.Y / rect.Height * pt2.X;
this.dy = plgpts[0].Y - rect.X / rect.Width * pt1.Y - rect.Y / rect.Height * pt2.Y;
}
/// <summary>
/// Initializes a new instance of the <see cref="SvgTransformF"/> class
/// to the geometric transform defined by the specified rectangle and
/// array of points.
/// </summary>
/// <param name="rect">
/// A <see cref="SvgRectF"/> structure that represents the rectangle
/// to be transformed.
/// </param>
/// <param name="plgpts">
/// An array of three <see cref="SvgPointF"/> structures that represents the
/// points of a parallelogram to which the upper-left, upper-right, and
/// lower-left corners of the rectangle is to be transformed. The
/// lower-right corner of the parallelogram is implied by the first three
/// corners.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the <paramref name="plgpts"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// If the length of the <paramref name="plgpts"/> array is not equal
/// to 3.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// If the width or height of the <paramref name="rect"/> is zero.
/// </exception>
public SvgTransformF(SvgRectF rect, SvgPointF[] plgpts)
{
if (plgpts == null)
{
throw new ArgumentNullException("plgpts");
}
if (plgpts.Length != 3)
{
throw new ArgumentException("plgpts");
}
if ((rect.Width == 0) || (rect.Height == 0))
{
throw new ArgumentOutOfRangeException("rect");
}
MapRectToRect(rect, plgpts);
}
/// <summary>
/// Initializes a new instance of the <see cref="SvgTransformF"/> class
/// to the geometric transform defined by the specified rectangle and
/// array of points.
/// </summary>
/// <param name="rect">
/// A <see cref="SvgRectF"/> structure that represents the rectangle
/// to be transformed.
/// </param>
/// <param name="plgpts">
/// An array of three <see cref="SvgPointF"/> structures that represents the
/// points of a parallelogram to which the upper-left, upper-right, and
/// lower-left corners of the rectangle is to be transformed. The
/// lower-right corner of the parallelogram is implied by the first three
/// corners.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the <paramref name="plgpts"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentException">
/// If the length of the <paramref name="plgpts"/> array is not equal
/// to 3.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// If the width or height of the <paramref name="rect"/> is zero.
/// </exception>
public SvgTransformF(SvgRectF rect, SvgPointF[] plgpts)
{
if (plgpts == null)
{
throw new ArgumentNullException(nameof(plgpts));
}
if (plgpts.Length != 3)
{
throw new ArgumentException(nameof(plgpts));
}
if (rect.Width.Equals(0) || rect.Height.Equals(0))
{
throw new ArgumentOutOfRangeException(nameof(rect));
}
MapRectToRect(rect, plgpts);
}
