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Tk_CanvasPs(3)		     Tk Library Procedures		Tk_CanvasPs(3)

______________________________________________________________________________

NAME
       Tk_CanvasPsY,   Tk_CanvasPsBitmap,  Tk_CanvasPsColor,  Tk_CanvasPsFont,
       Tk_CanvasPsPath, Tk_CanvasPsStipple - utility procedures for generating
       Postscript for canvases

SYNOPSIS
       #include <tk.h>

       double
       Tk_CanvasPsY(canvas, canvasY)

       int
       Tk_CanvasPsBitmap(interp, canvas, bitmap, x, y, width, height)

       int
       Tk_CanvasPsColor(interp, canvas, colorPtr)

       int
       Tk_CanvasPsFont(interp, canvas, tkFont)

       Tk_CanvasPsPath(interp, canvas, coordPtr, numPoints)

       int
       Tk_CanvasPsStipple(interp, canvas, bitmap)

ARGUMENTS
       Tk_Canvas canvas (in)		    A  token  that identifies a canvas
					    widget  for	 which	Postscript  is
					    being generated.

       double canvasY (in)		    Y-coordinate  in  the space of the
					    canvas.

       Tcl_Interp *interp (in/out)	    A Tcl interpreter;	Postscript  is
					    appended  to  its  result,	or the
					    result may	be  replaced  with  an
					    error message.

       Pixmap bitmap (in)		    Bitmap to use for generating Post‐
					    script.

       int x (in)			    X-coordinate within bitmap of left
					    edge of region to output.

       int y (in)			    Y-coordinate  within bitmap of top
					    edge of region to output.

       int width (in)			    Width of region of bitmap to  out‐
					    put, in pixels.

       int height (in)			    Height of region of bitmap to out‐
					    put, in pixels.

       XColor *colorPtr (in)		    Information about color  value  to
					    set in Postscript.

       Tk_Font tkFont (in)		    Font for which Postscript is to be
					    generated.

       double *coordPtr (in)		    Pointer to an array of coordinates
					    for	 one  or more points specified
					    in canvas coordinates.  The	 order
					    of	values	in coordPtr is x1, y1,
					    x2, y2, x3, y3, and so on.

       int numPoints (in)		    Number of points at coordPtr.
_________________________________________________________________

DESCRIPTION
       These procedures are called by canvas type managers to carry out common
       functions  related  to  generating  Postscript.	Most of the procedures
       take a canvas argument, which refers to a canvas widget for which Post‐
       script is being generated.

       Tk_CanvasPsY  takes as argument a y-coordinate in the space of a canvas
       and returns the value that should be used for that point in  the	 Post‐
       script  currently  being	 generated  for canvas.	 Y coordinates require
       transformation because Postscript uses an origin at the lower-left cor‐
       ner  whereas X uses an origin at the upper-left corner.	Canvas x coor‐
       dinates can be used directly in Postscript without transformation.

       Tk_CanvasPsBitmap generates Postscript to describe a region of  a  bit‐
       map.  The Postscript is generated in proper image data format for Post‐
       script, i.e., as data between angle brackets, one bit per  pixel.   The
       Postscript  is appended to interp->result and TCL_OK is returned unless
       an error occurs, in which case TCL_ERROR is returned and interp->result
       is overwritten with an error message.

       Tk_CanvasPsColor	 generates Postscript to set the current color to cor‐
       respond to its colorPtr argument, taking into  account  any  color  map
       specified  in  the  postscript  command.	  It appends the Postscript to
       interp->result and returns TCL_OK unless an error occurs, in which case
       TCL_ERROR  is  returned and interp->result is overwritten with an error
       message.

       Tk_CanvasPsFont generates Postscript that  sets	the  current  font  to
       match  tkFont  as  closely  as  possible.   Tk_CanvasPsFont  takes into
       account any font map specified in the postscript command, and  it  does
       the best it can at mapping X fonts to Postscript fonts.	It appends the
       Postscript to interp->result and returns TCL_OK unless an error occurs,
       in  which  case TCL_ERROR is returned and interp->result is overwritten
       with an error message.

       Tk_CanvasPsPath generates Postscript to set the current path to the set
       of  points  given  by coordPtr and numPoints.  It appends the resulting
       Postscript to interp->result.

       Tk_CanvasPsStipple generates Postscript that will fill the current path
       in  stippled  fashion.	It  uses bitmap as the stipple pattern and the
       current Postscript color;  ones in the stipple bitmap are drawn in  the
       current	color,	and  zeroes  are  not drawn at all.  The Postscript is
       appended to interp->result and TCL_OK  is  returned,  unless  an	 error
       occurs, in which case TCL_ERROR is returned and interp->result is over‐
       written with an error message.

KEYWORDS
       bitmap, canvas, color, font, path, Postscript, stipple

Tk				      4.0			Tk_CanvasPs(3)
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