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    Drawing polylines on a gnocl::pixBuf

    The is no single command in the Cairo 2d drawing library to produce polylines. Here's one to do it from Tcl side.



    proc polyLine {w coords} {
        set i 1
        foreach {x y} $coords {
            if {$i} {
                set x1 $x ; set y1 $y
                set i 0
            } else {
                gnocl::draw line $w -from [list $x1 $y1] -to [list $x $y]
                set x1 $x ; set y1 $y
            }
        }
    }

    polyLine $pb2 [list 0 100 100 0 200 100 150 200]

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