/// <summary>
/// This method tries to calculate min-max-width of rotated element using heuristics
/// of
/// <see cref="iText.Layout.Minmaxwidth.RotationMinMaxWidth.Calculate(double, double, iText.Layout.Minmaxwidth.MinMaxWidth)
/// "/>.
/// </summary>
/// <remarks>
/// This method tries to calculate min-max-width of rotated element using heuristics
/// of
/// <see cref="iText.Layout.Minmaxwidth.RotationMinMaxWidth.Calculate(double, double, iText.Layout.Minmaxwidth.MinMaxWidth)
/// "/>.
/// This method may call
/// <see cref="IRenderer.Layout(iText.Layout.Layout.LayoutContext)"/>
/// once in best case
/// (if the width is set on element, or if we are really lucky) and three times in worst case.
/// </remarks>
/// <param name="minMaxWidth">the minMaxWidth of NOT rotated renderer</param>
/// <param name="renderer">the actual renderer</param>
/// <returns>minMaxWidth of rotated renderer or original value in case rotated value can not be calculated, or renderer isn't rotated.
/// </returns>
public static MinMaxWidth CountRotationMinMaxWidth(MinMaxWidth minMaxWidth, AbstractRenderer renderer)
{
RotationUtils.PropertiesBackup backup = new RotationUtils.PropertiesBackup(renderer);
float?rotation = backup.StoreFloatProperty(Property.ROTATION_ANGLE);
if (rotation != null)
{
float angle = (float)rotation;
//This width results in more accurate values for min-width calculations.
float layoutWidth = minMaxWidth.GetMaxWidth() + MinMaxWidthUtils.GetEps();
LayoutResult layoutResult = renderer.Layout(new LayoutContext(new LayoutArea(1, new Rectangle(layoutWidth,
AbstractRenderer.INF))));
if (layoutResult.GetOccupiedArea() != null)
{
Rectangle layoutBBox = layoutResult.GetOccupiedArea().GetBBox();
if (MinMaxWidthUtils.IsEqual(minMaxWidth.GetMinWidth(), minMaxWidth.GetMaxWidth()))
{
backup.RestoreProperty(Property.ROTATION_ANGLE);
float rotatedWidth = (float)RotationMinMaxWidth.CalculateRotatedWidth(layoutBBox, angle);
return(new MinMaxWidth(rotatedWidth, rotatedWidth, 0));
}
double area = layoutResult.GetOccupiedArea().GetBBox().GetWidth() * layoutResult.GetOccupiedArea().GetBBox
().GetHeight();
RotationMinMaxWidth rotationMinMaxWidth = RotationMinMaxWidth.Calculate(angle, area, minMaxWidth);
float?rotatedMinWidth = GetLayoutRotatedWidth(renderer, (float)rotationMinMaxWidth.GetMinWidthOrigin(), layoutBBox
, angle);
if (rotatedMinWidth != null)
{
if (rotatedMinWidth > rotationMinMaxWidth.GetMaxWidth())
{
rotationMinMaxWidth.SetChildrenMinWidth((float)rotatedMinWidth);
float?rotatedMaxWidth = GetLayoutRotatedWidth(renderer, (float)rotationMinMaxWidth.GetMaxWidthOrigin(), layoutBBox
, angle);
if (rotatedMaxWidth != null && rotatedMaxWidth > rotatedMinWidth)
{
rotationMinMaxWidth.SetChildrenMaxWidth((float)rotatedMaxWidth);
}
else
{
rotationMinMaxWidth.SetChildrenMaxWidth((float)rotatedMinWidth);
}
}
else
{
rotationMinMaxWidth.SetChildrenMinWidth((float)rotatedMinWidth);
}
backup.RestoreProperty(Property.ROTATION_ANGLE);
return(rotationMinMaxWidth);
}
}
}
backup.RestoreProperty(Property.ROTATION_ANGLE);
return(minMaxWidth);
}
//Get actual width of element based on it's layout. May use occupied are of layout result of initial layout for time saving.
private static float?GetLayoutRotatedWidth(AbstractRenderer renderer, float availableWidth, Rectangle previousBBox
, double angle)
{
if (MinMaxWidthUtils.IsEqual(availableWidth, previousBBox.GetWidth()))
{
return((float)RotationMinMaxWidth.CalculateRotatedWidth(previousBBox, angle));
}
LayoutResult result = renderer.Layout(new LayoutContext(new LayoutArea(1, new Rectangle(availableWidth + MinMaxWidthUtils
.GetEps(), AbstractRenderer.INF))));
if (result.GetOccupiedArea() != null)
{
return((float)RotationMinMaxWidth.CalculateRotatedWidth(result.GetOccupiedArea().GetBBox(), angle));
}
return(null);
}
/// <summary>This method tries to calculate width of not rotated renderer, so after rotation it fits availableWidth.
/// </summary>
/// <remarks>
/// This method tries to calculate width of not rotated renderer, so after rotation it fits availableWidth.
/// This method uses heuristics of
/// <see cref="iText.Layout.Minmaxwidth.RotationMinMaxWidth.Calculate(double, double, iText.Layout.Minmaxwidth.MinMaxWidth, double)
/// "/>.
/// It doesn't take into account any of height properties of renderer or height of layoutArea.
/// The minMaxWidth calculations and initial layout may take long time, but they won't be called if the renderer have width property.
/// </remarks>
/// <param name="availableWidth">the width of layoutArea</param>
/// <param name="renderer">the actual renderer</param>
/// <returns>
/// the width that should be set as width of layout area to properly layout element, or fallback to
/// <see cref="AbstractRenderer.RetrieveWidth(float)"/>
/// in case it can not be calculated, or renderer isn't rotated.
/// </returns>
public static float?RetrieveRotatedLayoutWidth(float availableWidth, AbstractRenderer renderer)
{
RotationUtils.PropertiesBackup backup = new RotationUtils.PropertiesBackup(renderer);
float?rotation = backup.StoreFloatProperty(Property.ROTATION_ANGLE);
if (rotation != null && renderer.GetProperty <UnitValue>(Property.WIDTH) == null)
{
float angle = (float)rotation;
backup.StoreProperty <UnitValue>(Property.HEIGHT);
backup.StoreProperty <UnitValue>(Property.MIN_HEIGHT);
backup.StoreProperty <UnitValue>(Property.MAX_HEIGHT);
MinMaxWidth minMaxWidth = renderer.GetMinMaxWidth();
//Using this width for initial layout helps in case of small elements. They may have more free spaces but it's more likely they fit.
float length = (minMaxWidth.GetMaxWidth() + minMaxWidth.GetMinWidth()) / 2 + MinMaxWidthUtils.GetEps();
LayoutResult layoutResult = renderer.Layout(new LayoutContext(new LayoutArea(1, new Rectangle(length, AbstractRenderer
.INF))));
backup.RestoreProperty(Property.HEIGHT);
backup.RestoreProperty(Property.MIN_HEIGHT);
backup.RestoreProperty(Property.MAX_HEIGHT);
Rectangle additions = new Rectangle(0, 0);
renderer.ApplyPaddings(additions, true);
renderer.ApplyBorderBox(additions, true);
renderer.ApplyMargins(additions, true);
if (layoutResult.GetOccupiedArea() != null)
{
double area = layoutResult.GetOccupiedArea().GetBBox().GetWidth() * layoutResult.GetOccupiedArea().GetBBox
().GetHeight();
RotationMinMaxWidth result = RotationMinMaxWidth.Calculate(angle, area, minMaxWidth, availableWidth);
if (result != null)
{
backup.RestoreProperty(Property.ROTATION_ANGLE);
if (result.GetMaxWidthHeight() > result.GetMinWidthHeight())
{
return((float)(result.GetMinWidthOrigin() - additions.GetWidth() + MinMaxWidthUtils.GetEps()));
}
else
{
return((float)(result.GetMaxWidthOrigin() - additions.GetWidth() + MinMaxWidthUtils.GetEps()));
}
}
}
}
backup.RestoreProperty(Property.ROTATION_ANGLE);
return(renderer.RetrieveWidth(availableWidth));
}
