type statetype
    tool as long
    fcolor as long
    bcolor as long
    offsetx as long
    offsety as long
    zoom as single
    brushsize as integer
    startx as long
    starty as long
    isdrawing as integer
end type

type layertype
    ihandle as long
    blendmode as long
    filter as long
    kind as long
end type

redim shared layers(3) as layertype
dim shared state as statetype
redim shared commands(0) as string
dim shared showtoolbox as _byte:showtoolbox=-1
dim shared showcolorpicker as _byte:showcolorpicker=-1
dim shared showcommands as _byte:showcommands=0

dim shared mouseclicked as integer
dim shared mousedown as integer
dim shared rmouseclicked as integer
dim shared rmousedown as integer

$resize:on
screen _newimage(750,480,32)
_delay 0.1
temp&=_resize
redim shared pal(0) as _unsigned long
dim as integer ch1,ch2,ch3,bt
loadpalette"slso8",pal()
layers(0).ihandle=_newimage(320,320,32)
layers(1).ihandle=_newimage(320,320,32)
layers(2).ihandle=_newimage(320,320,32)
layers(3).ihandle=_newimage(320,320,32)

_dest layers(0).ihandle
addcommand"canvas ("+tst(_width)+","+tst(_height)+")"
for y=0 to _height-16 step 16
    for x=0 to _width-16 step 16
        if ((x+y)/16 and 1)=0 then
            line (x,y)-(x+16,y+16),_rgb32(127),bf
        else
            line (x,y)-(x+16,y+16),_rgb32(192),bf
        end if
    next
next
_dest 0
state.tool=1
state.zoom=1.0
state.offsetx=70+20
state.offsety=20
state. brushsize=1
state.fcolor=closestcolor(_rgb32(0,0,0),pal())
state.bcolor=closestcolor(_rgb32(255,255,255),pal())
addcommand"fcolor ("+hex$(state.fcolor)+")"
addcommand"bcolor ("+hex$(state.bcolor)+")"

dim lastmx,lastmy
dim keyin as string
dim mouseworldy as integer
dim mouseworldx as integer

dim diffx as integer
dim diffy as integer
dim oldwidth as integer
dim oldheight as integer
oldwidth=_width
oldheight=_height
do
    if checkresize(_source)=-1 then
        diffx=_width-oldwidth
        diffy=_height-oldheight
        state.offsetx=state.offsetx+(diffx/2)
        state.offsety=state.offsety+(diffy/2)
        oldwidth=_width
        oldheight=_height
    end if

    canvas
    if showtoolbox then toolbox
    if showcolorpicker then colorpicker
    if showcommands then commandlist

    'Mouse Handling
    while _mouseinput:mw=mw+_mousewheel:wend
    mouseclicked=0
    rmouseclicked=0
    if mousedown=-1 and _mousebutton(1)=0 then mouseclicked=-1
    if rmousedown=-1 and _mousebutton(2)=0 then rmouseclicked=-1
    mousedown=_mousebutton(1)
    rmousedown=_mousebutton(2)

    ' Panning (Middle Mouse)
    if _mousebutton(3) then
        state.offsetx=int(state.offsetx+(_mousex-lastmx))
        state.offsety=int(state.offsety+(_mousey-lastmy))
    end if
    lastmx=_mousex:lastmy=_mousey

    ' Zooming
    if mw<>0 then
        ' 1. Capture current world position
        mouseworldx=(_mousex-state.offsetx)/state.zoom
        mouseworldy=(_mousey-state.offsety)/state.zoom

        ' 2. Calculate the new zoom level (Snap to whole numbers)
        if mw>0 then
            state.zoom=state.zoom+1
        else
            state.zoom=state.zoom-1
        end if

        ' 3. Constrain zoom (Min 1, Max 20)
        if state.zoom<1 then state.zoom=1
        if state.zoom>20 then state.zoom=20

        ' 4. Adjust offsets
        state.offsetx=_mousex-(mouseworldx*state.zoom)
        state.offsety=_mousey-(mouseworldy*state.zoom)

        mw=0
    end if

    ' Keyboarding
    keyin=inkey$
    select case keyin
        case "+"
            state.brushsize=state.brushsize+1
            addcommand"brushsize ("+tst(state.brushsize)+")"
        case "-"
            if state.brushsize>1 then state.brushsize=state.brushsize-1
            addcommand"brushsize ("+tst(state.brushsize)+")"
        case chr$(19) ' ctrl+s
            'TODO: save logic
        case chr$(27) ' esc
            menu
        case "h"
            state.zoom=1.0
            state.offsetx=(_width/2)-(_width(layers(0).ihandle)/2)
            state.offsety=(_height/2)-(_height(layers(0).ihandle)/2)
        case "t"
            showtoolbox=not showtoolbox
        case "c"
            showcolorpicker=not showcolorpicker
        case "l"
            showcommands=not showcommands
    end select

    _limit 30
    _display
    line (0,0)-(_width-1,_height-1),backgroundcolor1,bf
loop

sub commandlist
    dim i as long
    dim listwidth as integer:listwidth=250
    dim x as integer:x=_width-listwidth

    ' Draw background for the list
    line (x,0)-(_width-1,_height-1),backgroundcolor1,bf
    line (x,0)-(x,_height-1),backgroundcolor2

    _printmode _keepbackground
    dim y as integer
    for i=ubound(commands)-1 to 0 step -1
        y=(ubound(commands)-i)*16
        if y<_height-20 then
            '_printstring (x + 5, y + 5), left$(commands(i), 31)
            if link(x+5,y+5,left$(commands(i),31)) then
                commands(i)=textinput(x+5,y+5,248,23,commands(i))
            end if
        end if
    next i
    if button(x,_height-25,60,23,"redraw") then redraw
end sub

sub redraw
    redim numarr(0) as long
    dim i as integer
    dim j as integer
    dim x as long
    dim y as long
    _dest layers(1).ihandle
    _source layers(1).ihandle
    cls,_rgb32(255)
    _clearcolor _rgb32(255)
    for i=lbound(commands) to ubound(commands)
        getnums commands(i),numarr()
        _dest layers(1).ihandle
        _source layers(1).ihandle
        select case lcase$(_trim$(left$(commands(i),instr(commands(i),"(")-1)))
            case "canvas"
                for j=0 to 3
                    if layers(j).ihandle<>0 then _freeimage layers(j).ihandle
                    layers(j).ihandle=_newimage(numarr(0),numarr(1),32)
                next j
                _dest layers(0).ihandle
                for y=0 to _height-16 step 16
                    for x=0 to _width-16 step 16
                        if ((x+y)/16 and 1)=0 then
                            line (x,y)-(x+16,y+16),_rgb32(127),bf
                        else
                            line (x,y)-(x+16,y+16),_rgb32(192),bf
                        end if
                    next
                next

            case "fcolor"
                state.fcolor=numarr(0)
            case "bcolor"
                state.bcolor=numarr(0)
            case "brushsize"
                state.brushsize=numarr(0)
            case "pixel"
                thickpixel numarr(0),numarr(1),numarr(2)
            case "line"
                thickline numarr(0),numarr(1),numarr(2),numarr(3),numarr(4)
            case "box"
                thickbox numarr(0),numarr(1),numarr(2),numarr(3),numarr(4)
            case "fbox"
                filledbox numarr(0),numarr(1),numarr(2),numarr(3),numarr(4)
            case "circle"
                thickcircle numarr(0),numarr(1),numarr(2),numarr(3)
            case "fcircle"
                filledcircle numarr(0),numarr(1),numarr(2),numarr(3)
            case "polygon"
                polygon numarr(),state.fcolor
            case "fpolygon"
                filledpolygon numarr(),state.fcolor
            case "floodfill"
                floodfill numarr(0),numarr(1),numarr(2)
            case ""
                ' blank line do nothing
            case else
                'debug info
                print"'"+lcase$(_trim$(left$(commands(i),instr(commands(i),"(")-1)))+"'"
        end select
    next i
    _dest 0
    _source 0
end sub

sub getnums (inputstr$,numarray() as long)
    ' 1. Extract inner content
    spos=instr(inputstr$,"(")
    epos=instr(inputstr$,")")
    if spos=0 or epos<=spos then exit sub

    content$=mid$(inputstr$,spos+1,epos-spos-1)
    idx=-1 ' Start at -1 so the first increment hits 0

    ' 2. Parse segments
    do
        cpos=instr(content$,",")
        if cpos>0 then
            part$=ltrim$(rtrim$(left$(content$,cpos-1)))
            content$=mid$(content$,cpos+1)
        else
            part$=ltrim$(rtrim$(content$))
            content$=""
        end if

        if len(part$)>0 then
            idx=idx+1
            redim _preserve numarray(idx) as long

            ' Determine if part is Hex (contains A-F)
            ishex=0
            for i=1 to len(part$)
                c$=ucase$(mid$(part$,i,1))
                if c$>="A"and c$<="F"then
                    ishex=1
                    exit for
                end if
            next i

            if ishex then
                numarray(idx)=val("&H"+part$)
            else
                numarray(idx)=val(part$)
            end if
        end if
    loop while len(content$)>0
end sub

sub toolbox
    dim i,x,y
    dim btnsize:btnsize=32
    dim spacing:spacing=1

    for i=0 to 19
        ' Force integer math to keep columns locked at 2
        ' x will only ever be 0 or 33
        x=(i mod 2)*(btnsize+spacing)

        ' y will only increase every 2 buttons
        ' Use Int() if your language doesn't support the \ operator
        y=int(i/2)*(btnsize+spacing)

        if imagebutton(x,y,btnsize,btnsize,icon(i)) then
            state.tool=i+1
        end if
    next

    'colorindicator
    y=y+btnsize+16
    line (16,y+16)-(64,y+64),state.bcolor,bf
    line (16,y+16)-(64,y+64),highlightcolor,b
    line (0,y)-(48,y+48),state.fcolor,bf
    line (0,y)-(48,y+48),highlightcolor,b
    if clickregion(0,y,48,48) then
        palettemanager state.fcolor
    elseif clickregion(16,y+16,48,48) then
        palettemanager state.bcolor
    end if
end sub

sub colorpicker
    static img as long
    if img=0 then img=_newimage(16,16,32)
    for i=0 to ubound(pal)
        _dest img
        cls,pal(i)
        line (0,0)-(_width-1,height-1),pal(i),bf
        _dest 0
        select case imagebutton(i*16,_height-17,16,16,img)
            case -1
                state.fcolor=pal(i)
                addcommand"fcolor ("+hex$(pal(i))+")"
            case -2
                state.bcolor=pal(i)
                addcommand"bcolor ("+hex$(pal(i))+")"
        end select
    next i
end sub

sub addcommand(cmd as string)
    'this check is probably more clever than good is.
    if commands(ubound(commands)+(ubound(commands)>0))<>cmd then
        commands(ubound(commands))=cmd
        redim _preserve commands(ubound(commands)+1) as string
    end if
end sub

sub canvas
    ' 1. Define the Viewport (The "Window" on your screen)
    dim viewx1 as integer
    if showtoolbox then viewx1=70 else viewx1=0
    dim viewy1 as integer:viewy1=0
    dim viewx2 as integer
    if showcommands then viewx2=_width-151 else viewx2=_width-1
    dim viewy2 as integer
    if showcolorpicker then viewy2=_height-20 else viewy2=_height-1
    _dest 0

    ' 2. Render Layers with Clipping
    dim srcx1 as long
    dim srcy1 as long
    dim srcx2 as long
    dim srcy2 as long
    dim drawx1 as long
    dim drawy1 as long
    dim drawx2 as long
    dim drawy2 as long

    dim i as integer
    for i=0 to ubound(layers)
        dim img as long:img=layers(i).ihandle
        dim imgw as integer:imgw=_width(img)
        dim imgh as integer:imgh=_height(img)

        ' Current scaled dimensions
        dim fullscaledw as single:fullscaledw=imgw*state.zoom
        dim fullscaledh as single:fullscaledh=imgh*state.zoom

        ' Calculate visible area in screen coordinates (Overlap of image and viewport)
        drawx1=state.offsetx
        drawy1=state.offsety
        drawx2=state.offsetx+fullscaledw
        drawy2=state.offsety+fullscaledh

        ' Clip the destination to the Viewport
        if drawx1<viewx1 then drawx1=viewx1
        if drawy1<viewy1 then drawy1=viewy1
        if drawx2>viewx2 then drawx2=viewx2
        if drawy2>viewy2 then drawy2=viewy2

        ' Only draw if the image is actually inside the viewport
        if drawx2>drawx1 and drawy2>drawy1 then
            ' Map screen-clipped coordinates back to the source image coordinates
            srcx1=int((drawx1-state.offsetx)/state.zoom)
            srcy1=int((drawy1-state.offsety)/state.zoom)
            srcx2=int((drawx2-state.offsetx)/state.zoom)
            srcy2=int((drawy2-state.offsety)/state.zoom)

            ' Syntax: _PUTIMAGE (destX1, destY1)-(destX2, destY2), sourceHandle, 0, (srcX1, srcY1)-(srcX2, srcY2)
            _putimage (drawx1,drawy1)-(drawx2,drawy2),img,0,(srcx1,srcy1)-(srcx2,srcy2)
        end if
    next
    _dest layers(2).ihandle:cls,0:_dest 0
    ' 2.5 if the mouse is in ui thats all we need
    if showtoolbox then
        if _mousex>=0 and _mousex<=70 then
            exit sub
        end if
    end if
    if showcolorpicker then
        if _mousey>=_height-20 then
            exit sub
        end if
    end if
    if showcommands then
        if _mousex>=drawx2 then
            exit sub
        end if
    end if

    dim r as integer

    ' 3. Calculate Canvas Coordinates
    dim canx as long
    dim cany as long
    canx=int((_mousex-state.offsetx)/state.zoom)
    cany=int((_mousey-state.offsety)/state.zoom)

    static polypoints(200) as single
    static pointcount as integer

    static drawcol
    if _mousebutton(1) then drawcol=state.fcolor
    if _mousebutton(2) then drawcol=state.bcolor

    if (mousedown or rmousedown) and state.isdrawing=0 then
        state.startx=canx
        state.starty=cany
        state.isdrawing=-1
    end if

    select case state.tool
        case 1
            do.pencil canx,cany,drawcol
        case 2
            do.line state.startx,state.starty,canx,cany,drawcol
        case 3
            do.circle state.startx,state.starty,sqr((canx-state.startx)^2+(cany-state.starty)^2),drawcol
        case 4
            do.fcircle state.startx,state.starty,sqr((canx-state.startx)^2+(cany-state.starty)^2),drawcol
        case 5
            do.box state.startx,state.starty,canx,cany,drawcol
        case 6
            do.fbox state.startx,state.starty,canx,cany,drawcol
        case 7
            do.polygon canx,cany
        case 8
            do.fpolygon canx,cany
        case 9
            do.floodfill canx,cany,drawcol
        case 10
            do.eyedropper canx,cany
    end select
end sub

sub do.pencil(x as long,y as long,col as long)
    dim osource as long
    dim odest as long
    osource=_source
    odest=_dest
    _dest layers(1).ihandle
    if _mousebutton(1) or _mousebutton(2) then
        thickpixel x,y,col
        addcommand"pixel ("+tst(x)+","+tst(y)+","+hex$(col)+")"
    end if
    state.isdrawing=0
    _dest odest
end sub

sub do.line(sx as long,sy as long,ex as long,ey as long,col as long)
    dim osource as long
    dim odest as long
    if state.isdrawing then
        osource=_source
        odest=_dest
        if mouseclicked or rmouseclicked then
            _dest layers(1).ihandle
            addcommand"line ("+tst(sx)+","+tst(sy)+","+tst(ex)+","+tst(ey)+","+hex$(col)+")"
            state.isdrawing=0
        else
            _dest layers(2).ihandle
        end if
        thickline sx,sy,ex,ey,col
        _source osource
        _dest odest
    end if
end sub

sub do.circle (x as long,y as long,r as long,col as long)
    dim osource as long
    dim odest as long
    if state.isdrawing then
        osource=_source
        odest=_dest
        if mouseclicked or rmouseclicked then
            _dest layers(1).ihandle
            addcommand"circle ("+tst(x)+","+tst(y)+","+tst(int(r))+","+hex$(col)+")"
            state.isdrawing=0
        else
            _dest layers(2).ihandle
        end if
        thickcircle x,y,r,col
        _source osource
        _dest odest
    end if
end sub

sub do.fcircle (x as long,y as long,r as long,col as long)
    dim osource as long
    dim odest as long
    if state.isdrawing then
        osource=_source
        odest=_dest
        if mouseclicked or rmouseclicked then
            _dest layers(1).ihandle
            addcommand"fcircle ("+tst(x)+","+tst(y)+","+tst(int(r))+","+hex$(col)+")"
            state.isdrawing=0
        else
            _dest layers(2).ihandle
        end if
        filledcircle x,y,r,col
        _source osource
        _dest odest
    end if
end sub

sub do.box(sx as long,sy as long,ex as long,ey as long,col as long)
    dim osource as long
    dim odest as long
    if state.isdrawing then
        osource=_source
        odest=_dest
        if mouseclicked or rmouseclicked then
            _dest layers(1).ihandle
            addcommand"box ("+tst(sx)+","+tst(sy)+","+tst(ex)+","+tst(ey)+","+hex$(col)+")"
            state.isdrawing=0
        else
            _dest layers(2).ihandle
        end if
        thickbox sx,sy,ex,ey,col
        _source osource
        _dest odest
    end if
end sub

sub do.fbox(sx as long,sy as long,ex as long,ey as long,col as long)
    dim osource as long
    dim odest as long
    if state.isdrawing then
        osource=_source
        odest=_dest
        if mouseclicked or rmouseclicked then
            _dest layers(1).ihandle
            addcommand"fbox ("+tst(sx)+","+tst(sy)+","+tst(ex)+","+tst(ey)+","+hex$(col)+")"
            state.isdrawing=0
        else
            _dest layers(2).ihandle
        end if
        filledbox sx,sy,ex,ey,col
        _source osource
        _dest odest
    end if
end sub

sub do.polygon(x as long,y as long)
    ' 1. Internalized State Memory
    static polypoints(500) as long
    static pointcount as integer

    dim osource as long
    dim odest as long
    dim p as integer
    dim i as integer
    dim tmpstr as string

    if state.isdrawing then
        osource=_source
        odest=_dest

        ' If left-clicked, add the coordinate to this routine's local array
        if mouseclicked then
            polypoints(pointcount*2)=x
            polypoints(pointcount*2+1)=y
            pointcount=pointcount+1
        end if

        ' Finish shape on Right-Click
        if rmouseclicked and pointcount>2 then
            _dest layers(1).ihandle

            redim finalp(pointcount*2-1) as long
            for p=0 to (pointcount*2)-1:finalp(p)=polypoints(p):next

            polygon finalp(),state.fcolor

            tmpstr="polygon ("
            for i=0 to ubound(finalp)-1
                tmpstr=tmpstr+tst(finalp(i))+","
            next i
            tmpstr=tmpstr+tst(finalp(i))+")"
            addcommand tmpstr

            ' Clean up local tool state
            state.isdrawing=0
            pointcount=0
        else
            ' Live preview rendering loop
            _dest layers(2).ihandle
            if pointcount>0 then
                for p=1 to pointcount-1
                    thickline polypoints((p-1)*2),polypoints((p-1)*2+1),polypoints(p*2),polypoints(p*2+1),state.fcolor
                next p
                thickline polypoints((pointcount-1)*2),polypoints((pointcount-1)*2+1),x,y,state.fcolor
            end if
        end if

        _source osource
        _dest odest
    end if
end sub

sub do.fpolygon(x as long,y as long)
    ' 1. Internalized State Memory
    static polypoints(500) as long
    static pointcount as integer

    dim osource as long
    dim odest as long
    dim p as integer
    dim i as integer
    dim tmpstr as string

    if state.isdrawing then
        osource=_source
        odest=_dest

        ' If left-clicked, add the coordinate to this routine's local array
        if mouseclicked then
            polypoints(pointcount*2)=x
            polypoints(pointcount*2+1)=y
            pointcount=pointcount+1
        end if

        ' Finish shape on Right-Click
        if rmouseclicked and pointcount>2 then
            _dest layers(1).ihandle

            redim finalp(pointcount*2-1) as long
            for p=0 to (pointcount*2)-1:finalp(p)=polypoints(p):next

            filledpolygon finalp(),state.fcolor

            tmpstr="fpolygon ("
            for i=0 to ubound(finalp)-1
                tmpstr=tmpstr+tst(finalp(i))+","
            next i
            tmpstr=tmpstr+tst(finalp(i))+")"
            addcommand tmpstr

            ' Clean up local tool state
            state.isdrawing=0
            pointcount=0
        else
            ' Live preview rendering loop
            _dest layers(2).ihandle
            if pointcount>0 then
                for p=1 to pointcount-1
                    thickline polypoints((p-1)*2),polypoints((p-1)*2+1),polypoints(p*2),polypoints(p*2+1),state.fcolor
                next p
                thickline polypoints((pointcount-1)*2),polypoints((pointcount-1)*2+1),x,y,state.fcolor
            end if
        end if

        _source osource
        _dest odest
    end if
end sub

sub do.floodfill(x as long,y as long,col as long)
    dim osource as long
    dim odest as long
    osource=_source
    odest=_dest
    if mouseclicked or rmouseclicked then
        _source layers(1).ihandle
        _dest layers(1).ihandle
        floodfill x,y,col
        addcommand"floodfill ("+tst(x)+","+tst(y)+","+hex$(col)+")"
        state.isdrawing=0
        _source osource
        _dest odest
    end if
end sub

sub do.eyedropper(x as long,y as long)
    dim osource as long
    if _mousebutton(1) or _mousebutton(2) then
        osource=_source
        _source layers(1).ihandle ' Read from the main drawing layer
        ' Ensure the coordinates are within the canvas boundaries
        if x>=0 and x<_width(layers(1).ihandle) and y>=0 and y<_height(layers(1).ihandle) then
            ' Left click sets foreground color, Right click sets background color
            if _mousebutton(1) then
                state.fcolor=point(x,y)
                addcommand"fcolor ("+hex$(point(x,y))+")"
            elseif _mousebutton(2) then
                state.bcolor=point(x,y)
                addcommand"bcolor ("+hex$(point(x,y))+")"
            end if
        end if
        state.isdrawing=0
        _source osource
    end if
end sub

function icon (index as long)
    static init as integer
    static icons() as long
    if not init then
        redim icons(19) as long ' Room for 20 icons
        dim c as _unsigned long:c=_rgb32(255,255,255) ' Main icon color

        ' --- 1. Pencil Tool ---
        icons(0)=_newimage(32,32,32):_dest icons(0)
        line (6,26)-(22,10),c
        line (22,10)-(26,6),c
        line (26,6)-(26,10),c
        line (26,10)-(10,26),c
        line (10,26)-(6,26),c
        pset (7,25),c ' Tip point
        _dest 0

        ' --- 2. Line Tool ---
        icons(1)=_newimage(32,32,32):_dest icons(1)
        line (5,27)-(27,5),c
        _dest 0

        ' --- 3. Hollow Circle ---
        icons(2)=_newimage(32,32,32):_dest icons(2)
        circle (16,16),11,c
        _dest 0

        ' --- 4. Filled Circle ---
        icons(3)=_newimage(32,32,32):_dest icons(3)
        dim r as integer
        for r=0 to 11:circle (16,16),r,c:next r
        _dest 0

        ' --- 5. Hollow Box ---
        icons(4)=_newimage(32,32,32):_dest icons(4)
        line (6,6)-(26,26),c,b
        _dest 0

        ' --- 6. Filled Box ---
        icons(5)=_newimage(32,32,32):_dest icons(5)
        line (6,6)-(26,26),c,bf
        _dest 0

        ' --- 7. Hollow Polygon (Triangle Blueprint) ---
        icons(6)=_newimage(32,32,32):_dest icons(6)
        line (16,5)-(6,25),c
        line (6,25)-(26,25),c
        line (26,25)-(16,5),c
        _dest 0

        ' --- 8. Filled Polygon ---
        icons(7)=_newimage(32,32,32):_dest icons(7)
        dim py as integer
        for py=5 to 25
            dim hw as integer:hw=(py-5)*10/20
            line (16-hw,py)-(16+hw,py),c
        next py
        _dest 0

        ' --- 9. Floodfill (Paint Bucket) ---
        icons(8)=_newimage(32,32,32):_dest icons(8)
        line (8,14)-(20,26),c ' Main body tilt left
        line (20,26)-(26,20),c
        line (26,20)-(14,8),c
        line (14,8)-(8,14),c
        ' Fixed syntax: Using valid multiplier expressions for the arc
        circle (14,11),6,c,_pi(1),_pi(1.5)
        pset (6,28),c ' Spilling drip point
        _dest 0

        ' --- 10. Eyedropper ---
        icons(9)=_newimage(32,32,32):_dest icons(9)
        line (6,26)-(10,22),c ' Pipette tip
        line (10,22)-(22,10),c ' Shaft side A
        line (6,26)-(18,14),c ' Bottom point accent
        line (14,18)-(26,6),c ' Shaft side B
        line (22,10)-(26,6),c ' Squeeze bulb cap
        _dest 0

        ' Fill remaining fallback slots (10-19) with clean blank images
        dim j as integer
        for j=10 to 19
            if icons(j)=0 then icons(j)=_newimage(32,32,32)
        next

        init=-1
    end if

    if index>=0 and index<=19 then
        icon=icons(index)
    else
        icon=icons(9)
    end if
end function

'$include: 'include/ui.bm'
'$include: 'include/imgout.bm'
'$include: 'include/palette.bm'
'$include: 'include/tools.bm'
''$include: 'include/effects.bm'

function adduiicon(imagehandle as long)
    dim unknown as long
    adduiicon=__internaluiicon(unknown,imagehandle,1)
end function

function adduiiconfromfile(filename as string)
    dim unknown as long
    adduiiconfromfile=__internaluiicon(unknown,_loadimage(filename),1)
end function

function uiicon(index)
    dim unknown as long
    uiicon=internaluiicon(index,unknown,2)
end function

function __internaluiicon&(index as long,imagehandle as long,mode as integer)
    static init as integer
    static icons() as long
    if not init or mode=3 then
        if mode<3 then
            redim icons(3) as long
        else
            _freeimage icons(0)
            _freeimage icons(1)
            _freeimage icons(2)
            _freeimage icons(3)
        end if
        icons(0)=_newimage(23,23,32) 'Up arrow'
        _dest icons(0)
        color textcolor

        icons(1)=_newimage(23,23,32) 'Down arrow'
        _dest icons(1)
        color textcolor

        icons(2)=_newimage(23,23,32) 'Left arrow'
        _dest icons(2)
        color textcolor

        icons(3)=_newimage(23,23,32) 'Right arrow'
        _dest icons(3)
        color textcolor

        _dest 0
        init=-1
    end if

    select case mode
        case 1
            redim _preserve icons(ubound(icons)+1)
            icons(ubound(icons))=imagehandle
            __internaluiicon=ubound(icons)
        case 2
            __internaluiicon=icons(index)
    end select
end function


function checkresize (currentscreen as _unsigned long) 'pulled straight out of the wiki'
    dim tempscreen as _unsigned long
    checkresize=0
    if _resize then
        tempscreen=_copyimage(currentscreen,32)
        screen tempscreen
        _freeimage currentscreen
        currentscreen=_newimage(_resizewidth,_resizeheight,32)
        screen currentscreen
        _putimage (0,0),tempscreen,currentscreen
        _display
        _freeimage tempscreen
        checkresize=-1
    end if
end function

sub menu()
    dim logo as long
    dim filename as string
    ' A logo is needed'
    'logo=_loadimage("logo.png")
    line (0,0)-(_width-1,_height-1),_rgb32(0,192),bf
    '_putimage ((_width(0)-_width(logo))/2,10),logo
    dim i as integer
    dim fh as integer
    do until done
        k$=inkey$
        while _mouseinput:wend
        mouseclicked=mbd and not _mousebutton(1)
        mbd=_mousebutton(1)

        if link(10,10,"open") then
            filename=textinput(10,10,100,23,"")
            if filename=""then exit sub
            fh=freefile
            redim commands(2000) as string
            open filename for input as fh
            do until eof(fh)
                line input #fh,commands(i)
                i=i+1
                if i>ubound(commands) then redim _preserve commands(ubound(commands)*2) as string
            loop
            close fh
            redim _preserve commands(i-1) as string
            redraw
            done=-1
        end if

        if link(10,34,"save") then
            filename=textinput(1,34,100,23,"")
            if filename=""then exit sub
            fh=freefile
            open filename for output as fh
            for i=0 to ubound(commands)
                print #fh,commands(i)
            next i
            close fh
            done=-1
        end if

        if link(10,56,"export") then
            filename=textinput(10,56,100,23,"")
            if filename=""then exit sub
            select case lcase$(right$(filename,4))
                case ".png"
                    save32bitpng layers(1).ihandle,filename
                case ".bmp"
                    save24bitbmp layers(1).ihandle,filename
                case ".ppm"
                    savebinaryppm layers(1).ihandle,filename
                case else
                    save32bitpng layers(1).ihandle,filename
            end select
            done=-1
        end if

        if link(10,78,"refenece img") then
            filename=textinput(10,78,100,23,"")
            if filename=""then exit sub
            if not _fileexists(filename) then exit sub
            if layers(3).ihandle<>0 then _freeimage layers(3).ihandle
            layers(3).ihandle=_loadimage(filename)
            _setalpha 20,layers(3).ihandle
            done=-1
        end if

        if link(10,100,"exit") then system

        if k$=chr$(27) then done=-1
        _limit 30
        _display
    loop
end sub

sub palettemanager(col as _unsigned long)
    line (0,0)-(_width-1,_height-1),col,bf
    'TODO: build palette mamager ui
end sub

function closestcolor~& (colour as _unsigned long,carr() as _unsigned long)
    dim r as integer
    dim g as integer
    dim b as integer
    dim ar as integer
    dim ag as integer
    dim ab as integer
    dim i as integer
    dim nearest as integer
    dim shortestdistance as integer
    dim distance as integer
    r=_red (colour)
    g=_green(colour)
    b=_blue (colour)
    shortestdistance=443
    for i=0 to ubound(carr)
        ar=_red (carr(i))
        ag=_green(carr(i))
        ab=_blue (carr(i))
        distance=sqr((r-ar) ^ 2+(g-ag) ^ 2+(b-ab) ^ 2)
        if distance<=shortestdistance then shortestdistance=distance:nearest=i
    next i
    closestcolor=carr(nearest)
end function

' trimmed str$
function tst$(numb)
    tst=_trim$(str$(numb))
end function