R-alpha: X11/Postscript Hardcopy bug

[Ross &]

A couple of people have come across this recently (piecharts and
boxplots trigger it I think.  Here is a fix (not a patch because
a new release is at hand).

In the C code in src/unix/psx11.c, replace the function psx11_Polygon
with the following code.
	Ross

- - - s n i p - - - h e r e - - -

void psx11_Polygon(int n, double *x, double *y, int bg, int fg)
{
        int i;
        if(bg != NA_INTEGER) {
                psx11_SetColor(bg);
                fprintf(psfp, "np\n");
                fprintf(psfp, "%.2f %.2f m\n",
                        xoffset + xscale * x[0],
                        yoffset + yscale * y[0]);
                for(i=1 ; i<n ; i++) {
                        fprintf(psfp, "%.2f %.2f l\n",
                                xoffset + xscale * x[i],
                                yoffset + yscale * y[i]);
                }
                fprintf(psfp, "cp f\n");
        }
        if(fg != NA_INTEGER) {
                psx11_SetColor(fg);
                fprintf(psfp, "np\n");
                fprintf(psfp, "%.2f %.2f m\n",
                        xoffset + xscale * x[0],
                        yoffset + yscale * y[0]);
                for(i=1 ; i<n ; i++) {
                        fprintf(psfp, "%.2f %.2f l\n",
                                xoffset + xscale * x[i],
                                yoffset + yscale * y[i]);
                }
                fprintf(psfp, "cp o\n");
        }
}
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