# set terminal svg size 600,400 dynamic enhanced fname 'arial' fsize 10 mousing name "rgbalpha_2" butt solid # set output 'rgbalpha.2.svg' set border 31 front linetype -1 linecolor rgb "gold" linewidth 1.000 set key title "Plot style rgbalpha" textcolor rgb "gold" set key at screen 0.75, 0.75, 0 left bottom vertical Left noreverse enhanced autotitles nobox set key noinvert samplen 1 spacing 1 width -7 height 0 set object 1 rect from screen 0, 0, 0 to screen 1, 1, 0 set object 1 behind lw 1.0 fc rgb "grey10" fillstyle solid 1.00 noborder set samples 128, 128 set size ratio 0.95 1,1 set xrange [ 0.00000 : 128.000 ] noreverse nowriteback set yrange [ 0.00000 : 128.000 ] noreverse nowriteback set lmargin at screen 0.1 set bmargin at screen 0.1 set tmargin at screen 0.9 focus(x,y) = ((column(0)-x)**2 + (column(-1)-(127-y))**2) > 400 ? 0 : 255 GPFUN_focus = "focus(x,y) = ((column(0)-x)**2 + (column(-1)-(127-y))**2) > 400 ? 0 : 255" plot 100.*(.4+sin(x/5.)/(x/5.)) lw 5 title 'solid line', 'lena.rgb' binary array=(128,128) format="%uchar" flipy using 1:2:3:(focus(70,50)) with rgbalpha title "Lena with circular mask"