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Annotation of researchv10no/cmd/postscript/dpost/ps_include.ps, revision 1.1

1.1     ! root        1: -> PS_head
        !             2: 
        !             3: %ps_include: begin
        !             4: save
        !             5: /ed {exch def} def
        !             6: 
        !             7: # redefine dangerous operators
        !             8: {} /showpage ed
        !             9: {} /copypage ed
        !            10: {} /erasepage ed
        !            11: {} /letter ed
        !            12: 
        !            13: # restore findfont from systemdict if it looks like it's be redefined
        !            14: currentdict /findfont known systemdict /findfont known and {
        !            15:        /findfont systemdict /findfont get def
        !            16: } if
        !            17: 
        !            18: # computations are done in the context of a new dictionary
        !            19: 36 dict dup /PS-include-dict-dw ed begin
        !            20: 
        !            21: # context holds the save object created earlier
        !            22: /context ed
        !            23: 
        !            24: # save and clear the operand stack
        !            25: count array astore /o-stack ed
        !            26: 
        !            27: # the following variables are now expected:
        !            28: #      llx,lly,urx,ury bounding box of picture to be included
        !            29: #      w               nonzero if space should be painted white to start
        !            30: #      o               nonzero if space should be outlined
        !            31: #      s               nonzero if both dimensions should be scaled
        !            32: #      cx,cy           center of page space in current coordinates
        !            33: #      sx,sy           size of page space in current coordinates
        !            34: #      ax,ay           left-right, up-down adjustment of picture in page space
        !            35: #      rot             rotation of picture in page space
        !            36: %ps_include: variables begin
        !            37: 
        !            38: 
        !            39: 
        !            40: -> PS_setup
        !            41: 
        !            42: %ps_include: variables end
        !            43: 
        !            44: # some routines:
        !            45: # - BBOX llx lly urx ury       put bounding box on stack
        !            46: # llx lly urx ury BOXPATH -    make a path with given box corners
        !            47: # dx dy LEN length             compute length of positionless vector
        !            48: # a b MIN min                  compute minimum of two numbers
        !            49: # a b MAX max                  compute maximum of two numbers
        !            50: # x y NICE x y                 move to pixel boundaries in default coords
        !            51: {llx lly urx ury} /bbox ed
        !            52: {newpath 2 index exch 2 index exch dup 6 index exch
        !            53:  moveto 3 {lineto} repeat closepath} /boxpath ed
        !            54: {dup mul exch dup mul add sqrt} /len ed
        !            55: {2 copy gt {exch} if pop} /min ed
        !            56: {2 copy lt {exch} if pop} /max ed
        !            57: {transform round exch round exch A itransform} /nice ed
        !            58: 
        !            59: # A is the transformation from default to current coordinates
        !            60: {6 array} /n ed
        !            61: n defaultmatrix n currentmatrix n invertmatrix n concatmatrix /A ed
        !            62: 
        !            63: # Sx,Sy and Cx,Cy are dimensions and size of bounding box in current coordinates
        !            64: urx llx sub 0 A dtransform len /Sx ed
        !            65: 0 ury lly sub A dtransform len /Sy ed
        !            66: llx urx add 2 div lly ury add 2 div A transform /Cy ed /Cx ed
        !            67: 
        !            68: # H and W are height and width of rotated box in current coordinates
        !            69: rot dup sin abs /S ed cos abs /C ed
        !            70: Sx S mul Sy C mul add /H ed
        !            71: Sx C mul Sy S mul add /W ed
        !            72: 
        !            73: # Scalex and Scaley are the required horizontal and vertical scaling factors
        !            74: sy H div /Scaley ed
        !            75: sx W div /Scalex ed
        !            76: 
        !            77: # Preserve aspect ratio if we're not scaling both dimensions (ie. s is 0)
        !            78: s 0 eq {Scalex Scaley min dup /Scalex ed /Scaley ed} if
        !            79: 
        !            80: # add to cx,cy the shift needed within the page space
        !            81: sx Scalex W mul sub 0 max ax 0.5 sub mul cx add /cx ed
        !            82: sy Scaley H mul sub 0 max ay 0.5 sub mul cy add /cy ed
        !            83: 
        !            84: # the actual rotation needed is rot less the current rotation
        !            85: urx llx sub 0 A dtransform exch atan rot exch sub /rot ed
        !            86: 
        !            87: # set up the coordinate system
        !            88: n currentmatrix initgraphics setmatrix
        !            89: cx cy translate
        !            90: Scalex Scaley scale
        !            91: rot rotate
        !            92: Cx neg Cy neg translate
        !            93: A concat
        !            94: 
        !            95: # set the clipping region, and conditionally whiteout and outline
        !            96: bbox boxpath clip newpath
        !            97: w 0 ne {gsave bbox boxpath 1 setgray fill grestore} if
        !            98: 
        !            99: # pop local dictionary from the dict stack
        !           100: end
        !           101: 
        !           102: # now begins the actual material extracted from the file
        !           103: gsave
        !           104: %ps_include: inclusion begin
        !           105: 
        !           106: 
        !           107: 
        !           108: -> PS_tail
        !           109: 
        !           110: %ps_include: inclusion end
        !           111: grestore
        !           112: 
        !           113: # within the context of the local dictionary ...
        !           114: PS-include-dict-dw begin
        !           115: 
        !           116: o 0 ne {gsave A defaultmatrix /A ed llx lly nice urx ury nice
        !           117:        initgraphics 0.1 setlinewidth boxpath stroke grestore} if
        !           118: 
        !           119: # ... restore the operand stack and the save context
        !           120: clear o-stack aload pop
        !           121: context end restore
        !           122: %ps_include: end

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