public static PdfImagePlacement Rotated(this PdfImagePlacement me, PdfImageRotation rotation)
{
for (var rotations = 0; rotations < (int)rotation; rotations++)
{
switch (me)
{
case PdfImagePlacement.LeftOrTop:
me = PdfImagePlacement.RightOrTop;
break;
case PdfImagePlacement.RightOrTop:
me = PdfImagePlacement.RightOrBottom;
break;
case PdfImagePlacement.RightOrBottom:
me = PdfImagePlacement.LeftOrBottom;
break;
case PdfImagePlacement.LeftOrBottom:
me = PdfImagePlacement.LeftOrTop;
break;
}
}
return(me);
}
/// <summary>
/// Adds a PdfScriptObject to the page that draws an image,
/// scaled to the given width and height.
/// </summary>
public static PdfObjectRef DrawImage(this PdfPageWriter page, double x, double y, Image image, double width, double height, PdfImagePlacement imagePlacement, PdfImageRotation rotation = PdfImageRotation.None)
{
var imageRef = page.DocumentWriter.AddImage(image);
return(page.DrawImageRef(x, y, imageRef, width, height, imagePlacement, rotation));
}
/// <summary>
/// Adds a PdfScriptObject to the page that draws an image previously added to the DocumentWriter,
/// scaled to the given width and height.
/// </summary>
public static PdfObjectRef DrawImageRef(this PdfPageWriter page, double x, double y, PdfObjectRef imageRef, double width, double height, PdfImagePlacement imagePlacement, PdfImageRotation rotation = PdfImageRotation.None)
{
var width2 = width;
var height2 = height;
var xdelta = 0.0;
var ydelta = 0.0;
// Fix for rotations:
if (rotation == PdfImageRotation.Left || rotation == PdfImageRotation.Right)
{
Swap(ref width2, ref height2);
}
imagePlacement = imagePlacement.Rotated(rotation);
if (imagePlacement != PdfImagePlacement.Stretch)
{
// Calculate box aspect ratio and image aspect ratio:
var boxar = height2 / width2;
var imgar = page.DocumentWriter.GetImageHeight(imageRef, 1.0);
if (imgar < boxar)
{
var imgh = height2 / boxar * imgar;
switch (imagePlacement)
{
case PdfImagePlacement.LeftOrTop:
case PdfImagePlacement.RightOrTop:
ydelta = (height2 - imgh);
break;
case PdfImagePlacement.Center:
ydelta = (height2 - imgh) / 2.0;
break;
}
height2 = imgh;
}
else
{
var imgw = width2 * boxar / imgar;
switch (imagePlacement)
{
case PdfImagePlacement.RightOrBottom:
xdelta = (width2 - imgw);
break;
case PdfImagePlacement.RightOrTop:
xdelta = (width2 - imgw);
break;
case PdfImagePlacement.Center:
xdelta = (width2 - imgw) / 2.0;
break;
}
width2 = imgw;
}
}
// Correct for rotations:
switch (rotation)
{
case PdfImageRotation.None: break;
case PdfImageRotation.Left:
Swap(ref xdelta, ref ydelta);
xdelta = width - xdelta;
break;
case PdfImageRotation.Right:
Swap(ref xdelta, ref ydelta);
ydelta = height - ydelta;
break;
case PdfImageRotation.UpsideDown:
xdelta = width - xdelta;
ydelta = height - ydelta;
break;
}
var obj = new PdfScriptObject();
obj.DrawImageByName(x + xdelta, y + ydelta, width2, height2, page.DocumentWriter.GetNameOfXObject(imageRef), ((int)rotation) * 90.0);
return(page.WriteObject(obj));
}
