namespace eval kv_overlay {
#grid part

    proc drawgrid {} {
        osd_widgets::msx_init grid
        #                   rrggbbaa
        variable color [list "0xffffff50" "0x0000ff50"]

        #setup grid y
        for {set y 0} {$y < 25} {incr y} {
        osd create rectangle grid.liney$y -scaled true -rely [expr {($y*8)} ] -x 0 -h 1 -relw 257 -rgba [lindex $color [expr {$y % 2}]]
        }

        #setup grid x
        for {set x 0} {$x < 33} {incr x} {
        osd create rectangle grid.linex$x -scaled true -relx [expr {($x*8)} ] -y   0 -relh 193 -w 1 -rgba [lindex $color [expr {$x % 2}]]
        }

        #setup coordinates
        osd create text grid.coords -relx 0 -rely -10 -text "Coordinates" -rgba 0xffffff80 -size 6
        osd create text grid.snap   -relx 180 -rely -10 -text "Coordinates" -rgba 0xffffff80 -size 6

        #call update procedure
        updatecoords
    }

    proc updatecoords {} {

        osd_widgets::msx_update grid

        set gridsize 8

        lassign [osd info "grid" -mousecoord] x y
        # make sure you register only on the MSX screen

        if ($x=="Inf") {set x 0}
        if ($y=="Inf") {set y 0}

        set x [utils::clip 0 255 [expr {int($x)}]]
        set y [utils::clip 0 191 [expr {int($y)}]]

        # put coordinates on screen
        osd configure  grid.coords -text "[expr {int($x)}] - [expr {int($y)}]"

        osd configure  grid.snap -text "Snap to $gridsize x $gridsize grid - [expr {int($x / $gridsize)*$gridsize}] - [expr {int($y / $gridsize)*$gridsize}]"

        #call self after frame
        after frame kv_overlay::updatecoords
    }

#editor part
    proc activate_kv2_editor {} {

        osd_widgets::msx_init kv
        activate_input_layer kv

        bind -layer kv "mouse button1 down" {keymatrixdown 8 0x01}
        bind -layer kv "mouse button1 up" {keymatrixup 8 0x01}

        bind -layer kv "mouse button3 down" {keymatrixdown 4 0x04}
        bind -layer kv "mouse button3 up" {keymatrixup 4 0x04}

        FollowMouse
    }

    proc FollowMouse {} {
        osd_widgets::msx_update kv

        lassign [osd info "kv" -mousecoord] x y
        # make sure you register only on the MSX screen

        if ($x=="Inf") {set x 0}
        if ($y=="Inf") {set y 0}

        set x [utils::clip 0 255 [expr {int($x)}]]
        set y [utils::clip 0 191 [expr {int($y)}]]

        # value 28 == in editor
        if {[peek 0xe802] == 28} {
            set ::speed 400
            set ::mute on
            poke 0xe265  [expr {int($x / 8)}]
            poke 0xe264  [expr {int($y / 8)}]
        }
        if {[peek 0xe802] != 28} {
            set ::speed 100
            set ::mute off
        }

        after frame kv_overlay::FollowMouse
    }

    #export the following 2 commands
    namespace export activate_kv2_editor
    namespace export drawgrid
}

namespace import kv_overlay::*