//
// scaling calculations
//
public static void ApplyMaxNonUniformScaling(PDFTransformationMatrix onmatrix, PDFSize dest, PDFRect viewport)
{
PDFSize source = viewport.Size;
double scalex = dest.Width.PointsValue / source.Width.PointsValue;
double scaley = dest.Height.PointsValue / source.Height.PointsValue;
double offx = 0; // viewport.X.PointsValue;
double offy = 0; // viewport.Y.PointsValue;
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale((float)scalex, (float)scaley);
}
/// <summary>
/// This will render the transformation matrix and then the XObject name operation.
/// </summary>
/// <param name="context"></param>
/// <param name="writer"></param>
/// <returns></returns>
protected virtual bool OutputDrawingContent(PDFRenderContext context, PDFWriter writer)
{
if (null != this.OutPutName)
{
context.Graphics.SaveGraphicsState();
var x = context.Offset.X.RealValue;
x = context.Graphics.GetXPosition(x);
var y = (context.Offset.Y + this.Height).RealValue;
y = context.Graphics.GetYPosition(y);
if (this.ClipRect.HasValue)
{
//var rect = this.ClipRect.Value.Offset(context.Offset.X, context.Offset.Y);
//context.Graphics.SetClipRect(rect);
}
var matrix = new PDFTransformationMatrix();
matrix.SetTranslation((float)x, (float)y);
//Set the transformation matrix for the current offset
context.Graphics.SetTransformationMatrix(matrix, true, true);
if (!this.Matrix.IsIdentity)
{
context.Graphics.SetTransformationMatrix(this.Matrix, true, true);
}
context.Graphics.PaintXObject(this.OutPutName);
context.Graphics.RestoreGraphicsState();
return(true);
}
else
{
return(false);
}
}
public static void ApplyUniformStretching(PDFTransformationMatrix onmatrix, PDFSize dest, PDFRect viewport, AspectRatioAlign align)
{
PDFSize source = viewport.Size;
double scalex = dest.Width.PointsValue / source.Width.PointsValue;
double scaley = dest.Height.PointsValue / source.Height.PointsValue;
double offx = 0; // viewport.X.PointsValue;
double offy = 0; // viewport.Y.PointsValue;
float max = (float)Math.Max(scalex, scaley);
double w = source.Width.PointsValue * max;
double h = source.Height.PointsValue * max;
switch (align)
{
//YMin
case (AspectRatioAlign.xMinYMin):
//Scale to fit within the size without overflow and show at the top (so no x or y offset)
offx = 0;
offy = (dest.Height.PointsValue - h); //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
case (AspectRatioAlign.xMidYMin):
offx = (dest.Width.PointsValue - w) / 2;
offy = (dest.Height.PointsValue - h); //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
case (AspectRatioAlign.xMaxYMin):
//Scale to fit within the size without overflow and show at the top (so no x or y offset)
offx = dest.Width.PointsValue - w;
offy = (dest.Height.PointsValue - h); //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
//YMid
case (AspectRatioAlign.xMinYMid):
//Scale to fit within the size without overflow and show at the top (so no x or y offset)
offx = 0;
offy = (dest.Height.PointsValue - h) / 2; //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
case (AspectRatioAlign.xMidYMid):
//Scale to fit within the size without overflow and then position in the middle
offx = (dest.Width.PointsValue - w) / 2;
offy = (dest.Height.PointsValue - h) / 2; //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
case (AspectRatioAlign.xMaxYMid):
//Scale to fit within the size without overflow and show at the top (so no x or y offset)
offx = dest.Width.PointsValue - w;
offy = (dest.Height.PointsValue - h) / 2; //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
//YMax
case (AspectRatioAlign.xMinYMax):
//Scale to fit within the size without overflow and show at the top (so no x or y offset)
offx = 0;
offy = 0; //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
case (AspectRatioAlign.xMidYMax):
//Scale to fit within the size without overflow and then position in the middle
offx = (dest.Width.PointsValue - w) / 2;
offy = 0; //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
case (AspectRatioAlign.xMaxYMax):
//Scale to fit within the size without overflow and show at the top (so no x or y offset)
offx = dest.Width.PointsValue - w;
offy = 0; //plus as from the bottom
onmatrix.SetTranslation(offx, offy);
onmatrix.SetScale(max, max);
break;
default:
break;
}
}
