On 03/01/2011 12:48 PM, Eric Doviak wrote:
Everything should be done entirely within PDFedit.
Making some progress. (See attached).
- E
function setProp4( dict, p, a, b, c, d ) {
if ( !dict.exist( p ) ) {
var n = createArray();
n.add( createReal( 0 ) );
n.add( createReal( 0 ) );
n.add( createReal( 0 ) );
n.add( createReal( 0 ) );
dict.add( p, n );
}
x = dict.property( p );
x.property( 0 ).set( a );
x.property( 1 ).set( b );
x.property( 2 ).set( c );
x.property( 3 ).set( d );
}
function setScale( doc , pagenum , sx , sy ) {
var pg = doc.getPage( pagenum ) ;
pg.setTransformMatrix([sx,0,0,sy,0,0]);
}
function runPDFCrop( doc, pagenum ) {
dict = doc.getPage( pagenum ).getDictionary();
/* get the borders: hl vb hr vt */
media = dict.property( "MediaBox" );
hl = media.property( 0 ).value();
vb = media.property( 1 ).value();
hr = media.property( 2 ).value();
vt = media.property( 3 ).value();
/* assume letter-size paper -- TERRIBLE !!! */
/* determine orientation -- portrait or landscape */
/* if horizontal longer then landscape, else portrait */
if ( hr - hl > vt - vb ) {
pgwidth = 792 ;
pgheight = 612 ;
} else {
pgwidth = 612 ;
pgheight = 792 ;
}
/* get scale factor */
horiz = pgwidth / (hr-hl) ;
vert = pgheight / (vt-vb) ;
if ( horiz < vert ) {
scale = horiz ;
} else {
scale = vert ;
}
/* find midpoints on the page */
midh = ((hr - hl) / 2 ) + hl ;
midv = ((vt - vb) / 2 ) + vb ;
/* we want 5 percent margins on each side */
margins = 1.10 ;
/* here are the new page metrics -- everything centered */
nhl = ( midh * scale ) - ( pgwidth / 2 ) ;
nhr = nhl + pgwidth ;
/* nvb = ( midv * scale ) - ( pgheight / 2 ) ; */
/* nvt = nvb + pgheight ; */
/* alternative is to top-align the pages */
halfmargin = 1 + (( margins - 1 )/2) ;
nvb = vb * scale * halfmargin ;
nvt = nvb + pgheight ;
/* set CropBox, MediaBox and TrimBox. */
setProp4( dict, "CropBox", nhl, nvb, nhr, nvt ) ;
setProp4( dict, "MediaBox", nhl, nvb, nhr, nvt ) ;
setProp4( dict, "TrimBox", nhl, nvb, nhr, nvt ) ;
/* rescale the page */
setScale( doc , pagenum , scale , scale );
}
doc = loadPdf( takeParameter(), false );
/* resize and rescale all of the pages */
for (i=1; i<= doc.getPageCount(); ++i) {
runPDFCrop( doc , i ) ;
}
doc.save( false );
exit( 0 );
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