TweetFollow Us on Twitter

Cursor Editing
Volume Number:1
Issue Number:9
Column Tag:Basic School

"A Fat Bits Approach to Cursor Editing"

By Dave Kelly, Hybrids Engineer, MacTutor Editorial Board

Let's take a look at one of the Macintosh ROM routines which can be called from MSBASIC (version 2.0). By using the method described here, you can customize your own cursors for use within your programs.

Pages 298 and 299 of the MS BASIC manual explain the Mouse Cursor Handling Routines. The program 'Cursor Editor' in this article demonstrates how to build your own cursor using the CALL SETCURSOR (VARPTR( cursor %(0))) function. It would be helpful to enter the program and run it as you read the explanation here.

Fig. 1 Cursor Edit Program Menu

When you run the program, the main BASIC menus are replaced by a new File and Cursor menu. The Cursor menu allows you to edit the current custom cursor. The Arrow is the default cursor and cannot be edited unless you duplicate it as a custom cursor of your own. Choosing 'Hand' sets the cursor to a hand. An examination of the 'Hand' routine at the end of the program may help you to understand how the cursor%(0) array is setup.

By selecting 'Arrow' in the cursor menu you may clear the cursor to be edited to a blank. The editor is set to a blank (i. e. no cursor) when the program starts. Select 'Edit Cursor' from the menu. The bit parameters for the screen grid are set up and a blank grid is printed on the screen.

Fig. 2

Now just point and click the mouse to select what the cursor will look like. The program will appear to run a bit slow here while the correct bit is being selected. This takes longer in Basic than in most other languages, so be patient. When the cursor is finished click the OK button.

Now a new grid comes up to create a mask for our new cursor. The cursor mask selects which bits behind the cursor will be allowed to be seen through the cursor (the entire 16X16 grid). The program allows you to exper-iment with different masks until you get it just right. To test it out you can move the cursor over a black area of the screen and then over a white area and see what part of the background is allowed to be seen through the cursor. It is purely subjective so you can keep on trying till you are happy with it. For our example, I have filled in the inside of the cursor to make the mask. Any pixels of the screen which are behind the mask will not be allowed to be displayed. Click the OK button to continue.

Fig. 3 Creating the Mask

Next we set the hot spot of the cursor. The hot spot is the active area of the cursor that determines where it is pointing to. It is the intersection of the corners of the pixels. For our example, we want the hot spot to be at the tip of the pencil so we click there. A small square appears to mark the spot. You may want to try other locations for the hot spot if you don't quite understand the significance of the hot spot. Click OK to continue.

Fig. 4 Setting the Hot Spot

Now the new cursor will appear. WARNING: If the cursor which was defined had no pixels selected (i. e. a blank cursor), then it will be very difficult to select anything from this point on because you will not be able to see the cursor. If this happens you may have to abort (use command-period to halt a basic program). Basic will reinitialize the arrow cursor when you exit the program.

Your new cursor can now be stored in a file on the disk by using the file menu and loaded at a later time. The load routine may be copied for use in your own program to read in a custom cursor for your own programs. After the cursor data is stored to disk, the program will change the file type to "CURS" to enable the load routine to recognize only those files which contain cursor data. Any filename type may be changed so that the routine which reads the data may only select files of the same type.

Hopefully this program provides an easy way to customize your own cursors. A good way to create a library of cursors is to do a screen dump to disk of the MacPaint screen. Then load the dumped sceen and look at the cursors used by MacPaint using Fat Bits and dump each of them to the printer from the Fat Bit screen. Then the cursor can be copied bit by bit into the cursor editor program and saved. The program is available on disk if you don't want to have to type. Have fun!!!

' Cursor Editor
' By Dave Kelly
' ©MACTUTOR 1985

DEFINT i,j,k
DIM Cursor%(34), Bstatus%(512),    Bound0%(256), Bound1%(256), 
 Bound2%(256), Bound3%(256)
editor%=0:NewYork=2:Bold=1
Plain=0:Geneva=3
WINDOW 1,"Cursor Editor", (2,40)-(510,340),1
' Erase BASIC menus
FOR i=3 TO 5:MENU i,0,0,"":NEXT
MENU 1,0,1,"File"
MENU 1,1,1,"Load Cursor"
MENU 1,2,1,"Save Cursor"
MENU 1,3,1,"Quit"
MENU 2,0,1,"Cursor"
MENU 2,1,1,"Edit Cursor"
MENU 2,2,1,"Arrow (Clear Cursor)"
MENU 2,3,1,"Hand"

ON MENU GOSUB Checkmenu: MENU ON
IF editor%=0 THEN MENU STOP:GOSUB  InitEditor:MENU ON
loop:GOTO loop

Checkmenu:
    menunumber=MENU(0)
    menuitem=MENU(1):MENU
    IF menunumber=1 THEN filemenu
    ON menuitem GOSUB     Editor,Arrow,Hand
    RETURN

filemenu:
    ON menuitem GOSUB load.cursor, save.cursor,quit
    RETURN
    

InitEditor:
x=20:y=20:offsetx=0:offsety=0:editor%=1
TEXTFONT(NewYork)
TEXTSIZE(14):TEXTFACE(Bold)
LOCATE 5,1
PRINT"Please wait.... Initializing Editor."
MENU 1,0,0:MENU 2,0,0
FOR i=0 TO 33: cursor%(i)=0:NEXT i
PICTURE ON
FOR j= 0 TO 15
    FOR k=15 TO 0 STEP -1
        rectangle%(0)=y+offsety
        bound0%((j*16)+k)=rectangle%(0)
        rectangle%(1)=x+offsetx
        bound1%((j*16)+k)=rectangle%(1)
        rectangle%(2)=y+offsety+12
        bound2%((j*16)+k)=rectangle%(2)
        rectangle%(3)=x+offsetx+12
        bound3%((j*16)+k)=rectangle%(3)
        bstatus%((j*16)+k)=0
        offsetx=11+offsetx
FRAMERECT(VARPTR(rectangle%(0)))
    NEXT k
    offsety=11+offsety:offsetx=0
NEXT j
PICTURE OFF
grid$=PICTURE$
MENU 1,0,1:MENU 2,0,1:CLS
RETURN

Editor:
    MENU 1,0,0:MENU 2,0,0
   TEXTFONT(NewYork)
   TEXTSIZE(14):TEXTFACE(Bold)
    LOCATE 5,1:PRINT"Please wait for Setup of Editor."
    GOSUB Bitstatus
    
' set up new cursor
    GOSUB print.pic
    LOCATE 2,26:PRINT"Define New   Cursor"
    GOSUB Print.message
    GOSUB Draw.Datapixels
    GOSUB Define
    
' set up new mask
    GOSUB print.pic
    LOCATE 2,26:PRINT"Define New Mask"
    GOSUB Print.message
    GOSUB Draw.Maskpixels
    GOSUB Define
   
 ' set hot spot
    GOSUB print.pic
    LOCATE 2,26:PRINT"Set Hot Spot"
    GOSUB Print.message
    GOSUB define.hotspot
    CLS:BUTTON CLOSE 1
   TEXTFONT(NewYork):TEXTSIZE(14)
    TEXTFACE(Bold)
    LOCATE 5,1:PRINT"Please wait."
    GOSUB Cursor.done
    SETCURSOR (VARPTR(cursor%(0)))
    CLS:MENU 1,0,1:MENU 2,0,1
    RETURN

Print.pic:
    CLS:PICTURE,grid$
    TEXTFONT(NewYork)
    TEXTSIZE(14)
    TEXTFACE(Bold)
    RETURN
    
Print.message:
    TEXTFACE(Plain)
    TEXTSIZE(12)
    LOCATE 4,35:PRINT"Click              to continue"  'Note: Space must 
be ^^^^^ here
    BUTTON 1,1,"OK", (310,40)-(350,80),1
    RETURN

define.hotspot:
    GOSUB Draw.Datapixels
    CALL PENSIZE(4,4):CALL PENMODE(10)
    CALL MOVETO((cursor%(33)*11)+x,  (cursor%(32)*11)+y)
    CALL LINE(0,0)
    WHILE DIALOG(0)<>1
    IF MOUSE(0)>0 THEN GOSUB hotspot
    WEND
    CALL PENNORMAL
    BEEP
    RETURN

hotspot:
    xpos=MOUSE(1):ypos=MOUSE(2)
    IF xpos<x THEN xpos=x
    IF ypos<y THEN ypos=y
    IF xpos>x+16*11 THEN xpos=x+16*11
    IF ypos>y+16*11 THEN ypos=y+16*11

    CALL LINE(0,0)
    cursor%(33)=INT((xpos-x)/11)
    cursor%(32)=INT((ypos-y)/11)
    CALL MOVETO((cursor%(33)*11)+x,  (cursor%(32)*11)+y)
    CALL LINE(0,0)
    RETURN

Draw.Maskpixels:
    maskpixel=1
    FOR i= 256 TO 511
        IF bstatus%(i)=1 THEN rectangle%(0)=bound0%(i-256):    
 rectangle%(1)=bound1%(i-256):     rectangle%(2)=bound2%(i-256): 
 rectangle%(3)=bound3%(i-256):     PAINTRECT(VARPTR            
 (rectangle%(0))): FRAMERECT(VARPTR  (rectangle%(0)))
    NEXT i
    RETURN

Draw.Datapixels:
    maskpixel=0
    FOR i= 0 TO 255
        IF bstatus%(i)=1 THEN rectangle%(0)=bound0%(i):        rectangle%(1)=bound1%(i): 
 rectangle%(2)=bound2%(i):  rectangle%(3)=bound3%(i):          PAINTRECT(VARPTR 
 (rectangle%(0))): FRAMERECT(VARPTR  (rectangle%(0)))
    NEXT i
    RETURN
    
mousepress:
    GOSUB getpixel   'see which pixel is selected
    IF pixel%=256 THEN  RETURN
    IF Bstatus%(Pixel%+maskpixel*256)=0            THEN Bstatus%(Pixel%+ 
 maskpixel*256)=1 ELSE    Bstatus%(Pixel%+         maskpixel*256)=0
    rectangle%(0)=bound0%(Pixel%)
    rectangle%(1)=bound1%(Pixel%)
    rectangle%(2)=bound2%(Pixel%)
    rectangle%(3)=bound3%(Pixel%)
    INVERTRECT(VARPTR(rectangle%(0)))
    FRAMERECT(VARPTR(rectangle%(0)))
    RETURN
    


getpixel:
    Pixel%=256
    FOR i = 0 TO 255
        IF bound0%(i)<MOUSE(2) AND bound2%(i)>MOUSE(2) AND     
 bound1%(i)<MOUSE(1) AND  bound3%(i)>MOUSE(1) THEN             Pixel%=i:i=256
    NEXT i
    RETURN
    
Cursor.done:
    FOR j=0 TO 31
        cursor%(j)=0
        FOR k=14 TO 0 STEP -1
 cursor%(j)=(Bstatus%((j*16)+k)*(2^k))+cursor%(j)
        NEXT k
        IF Bstatus%((j*16)+15)=1 THEN  cursor%(j)=cursor%(j)+&H8000
    NEXT j
    RETURN
    
Define:
    WHILE DIALOG(0)<>1
    IF MOUSE(0)>0 THEN GOSUB  mousepress
    WEND
    BEEP
    RETURN
Bitstatus:
    FOR j=0 TO 31
        t%=cursor%(j)
        FOR k=15  TO 0 STEP -1
            IF t%<0 THEN  Bstatus%((j*16)+k)=1:t%=             t%-&H8000:GOTO 
endloop
            IF t%<2^k THEN  Bstatus%((j*16)+k)=0
            IF t%>=2^k THEN Bstatus%((j*16)+k)=1:t%=           t%-2^k
        endloop:NEXT k
    NEXT j
RETURN
load.cursor:
    filename$=FILES$(1,"CURS")
    IF filename$="" THEN exitload
    OPEN filename$ FOR INPUT AS #1
    FOR i= 0 TO 33
        INPUT #1,cursor%(i)
    NEXT i
    CLOSE #1
exitload:CALL SETCURSOR(VARPTR(cursor%(0)))
    RETURN
save.cursor:
    filename$=FILES$(0)
    IF filename$="" THEN exitsave
    OPEN filename$ FOR OUTPUT AS #1
    FOR i=0 TO 33
        PRINT #1,cursor%(i)
    NEXT i
    CLOSE #1
    NAME filename$ AS filename$,"CURS"
    exitsave:CALL SETCURSOR (VARPTR  (cursor%(0)))
    RETURN
quit:
    BUTTON CLOSE 1:MENU RESET
TEXTFONT(Geneva):TEXTFACE(Plain)
TEXTSIZE(12)
END
Arrow:
    INITCURSOR
    FOR i=0 TO 33: cursor%(i)=0:NEXT i
    RETURN
Hand:
'   Cursor Data
    Cursor%(0)=&H0:Cursor%(1)=&H0
    Cursor%(2)=&H700:Cursor%(3)=&H1900
    Cursor%(4)=&H2200:Cursor%(5)=&H4700
    Cursor%(6)=&HC7FE:Cursor%(7)=&H8C01
    Cursor%(8)=&H97FE:Cursor%(9)=&HE410
Cursor%(10)=&H87E0:Cursor%(11)=&H8420
Cursor%(12)=&HC7C0:Cursor%(13)=&H7F80
    Cursor%(14)=&H0:Cursor%(15)=&H0
'   Cursor Mask
    Cursor%(16)=&H0:Cursor%(17)=&H0
  Cursor%(18)=&H700:Cursor%(19)=&H1F00
Cursor%(20)=&H3E00:Cursor%(21)=&H7F00
Cursor%(22)=&HFFFE:Cursor%(23)=&HFFFF
Cursor%(24)=&HFFFE:Cursor%(25)=&HFFF0
Cursor%(26)=&HFFE0:Cursor%(27)=&HFFE0
Cursor%(28)=&HFFC0:Cursor%(29)=&H7F80
    Cursor%(30)=&H0: Cursor%(31)=&H0
    Cursor%(32)=7      'Vertical hot spot
    Cursor%(33)=16    'Horizontal hot spot
    SETCURSOR(VARPTR(cursor%(0)))
    RETURN
 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Firefox 58.0 - Fast, safe Web browser.
Firefox offers a fast, safe Web browsing experience. Browse quickly, securely, and effortlessly. With its industry-leading features, Firefox is the choice of Web development professionals and casual... Read more
macOS High Sierra 10.13.3 - The latest O...
macOS High Sierra introduces new core technologies that improve the most important functions of your Mac. From rearchitecting how it stores your data to improving the efficiency of video streaming to... Read more
Apple iOS 11.2.5 - The latest version of...
iOS 11 sets a new standard for what is already the world’s most advanced mobile operating system. It makes iPhone better than before. It makes iPad more capable than ever. And now it opens up both to... Read more
Adobe Audition CC 2018 11.0.1 - Professi...
Audition CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Audition customer). Adobe Audition CC 2018 empowers you to create and... Read more
Adobe After Effects CC 2018 15.0.1 - Cre...
After Effects CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous After Effects customer). The new, more connected After Effects CC... Read more
Adobe Premiere Pro CC 2018 12.0.1 - Digi...
Premiere Pro CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Premiere Pro customer). Adobe Premiere Pro CC 2018 lets you edit... Read more
Adobe Photoshop CC 2018 19.1 - Professio...
Photoshop CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Photoshop customer). Adobe Photoshop CC 2018, the industry standard... Read more
Spotify 1.0.69.336. - Stream music, crea...
Spotify is a streaming music service that gives you on-demand access to millions of songs. Whether you like driving rock, silky R&B, or grandiose classical music, Spotify's massive catalogue puts... Read more
rekordbox 5.1.1.0001 - Professional DJ m...
rekordbox is the best way of preparing and managing your tracks, be it at home, in the studio, or even on the plane! It allows you to import music from other music-management software using the... Read more
Mactracker 7.7.1 - Database of all Mac m...
Mactracker provides detailed information on every Mac computer ever made, including items such as processor speed, memory, optical drives, graphic cards, supported OS X versions, and expansion... Read more

Latest Forum Discussions

See All

Jydge hints, tips, and tricks - Everythi...
Just released on iOS, Jydge is a prequel to Neon Chrome and is set in the same universe. Not just that, but the games play in pretty similar ways with them both being twin stick shooters full of surprises. As you might expect from a 10tons game,... | Read more »
World of Warships Blitz: A guide to tact...
Ahoy mates! It's time to set out on the high seas for some PvP battles, and ... sorry, actually, World of Warships Blitz has nothing to do with pirates. Let's start over. [Read more] | Read more »
Around the Empire: What have you missed...
Around this time every week we're going to have a look at the comings and goings on the other sites in Steel Media's pocket-gaming empire. We'll round up the very best content you might have missed, so you're always going to be up to date with the... | Read more »
Everything about Hero Academy 2: Part 4...
In this part of our Hero Academy 2 guide, we're going to have a look at some of the tactics you're going to need to learn if you want to rise up the ranks. We're going to start off slow, then get more advanced in the next section. [Read more] | Read more »
All the best games on sale for iPhone an...
Another week has flown by. Sometimes it feels like the only truly unstoppable thing is time. Time will make dust of us all. But before it does, we should probably play as many awesome mobile videogames as we can. Am I right, or am I right? [Read... | Read more »
The 7 best games that came out for iPhon...
Well, it's that time of the week. You know what I mean. You know exactly what I mean. It's the time of the week when we take a look at the best games that have landed on the App Store over the past seven days. And there are some real doozies here... | Read more »
Popular MMO Strategy game Lords Mobile i...
Delve into the crowded halls of the Play Store and you’ll find mobile fantasy strategy MMOs-a-plenty. One that’s kicking off the new year in style however is IGG’s Lords Mobile, which has beaten out the fierce competition to receive Google Play’s... | Read more »
Blocky Racing is a funky and fresh new k...
Blocky Racing has zoomed onto the App Store and Google Play this week, bringing with it plenty of classic kart racing shenanigans that will take you straight back to your childhood. If you’ve found yourself hooked on games like Mario Kart or Crash... | Read more »
Cytus II (Games)
Cytus II 1.0.1 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0.1 (iTunes) Description: "Cytus II" is a music rhythm game created by Rayark Games. It's our fourth rhythm game title, following the footsteps of three... | Read more »
JYDGE (Games)
JYDGE 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: Build your JYDGE. Enter Edenbyrg. Get out alive. JYDGE is a lawful but awful roguehate top-down shooter where you get to build your... | Read more »

Price Scanner via MacPrices.net

Where to buy 13″ Apple MacBook Pros for up to...
B&H Photo has 13″ MacBook Pros on sale for $100 off MSRP. Shipping is free, and B&H charges sales tax for NY & NJ residents only: – 13-inch 2.3GHz/128GB Space Gray MacBook Pro (MPXQ2LL/A... Read more
Apple Refurbished 2017 iMacs available starti...
Apple has a full line of Certified Refurbished iMacs available for up to $350 off original MSRP. Apple’s one-year warranty is standard, and shipping is free. The following models are available: – 27... Read more
Apple offers clearance 2016 13-inch MacBook A...
Apple has Certified Refurbished 2016 13″ MacBook Airs available starting at $809. An Apple one-year warranty is included with each MacBook, and shipping is free: – 13″ 1.6GHz/8GB/128GB MacBook Air: $... Read more
Clearance Apple refurbished iMacs available s...
Apple has previous-generation Certified Refurbished 2015 21″ & 27″ iMacs available starting at $849. Apple’s one-year warranty is standard, and shipping is free. The following models are... Read more
How to save $150-$420 on the purchase of a 20...
B&H Photo has 15″ MacBook Pros on sale for up to $200 off MSRP. Shipping is free, and B&H charges sales tax for NY & NJ residents only: – 15″ 2.8GHz Touch Bar MacBook Pro Space Gray (... Read more
How to save $100-$180 on the purchase of a 20...
B&H Photo has 13″ MacBook Airs on sale for $50-$120 off MSRP. Shipping is free, and B&H charges sales tax for NY & NJ residents only: – 13″ 1.8GHz/128GB MacBook Air (MQD32LL/A): $899, $... Read more
Save on Beats: $30-$80 off headphones, earpho...
Walmart has Beats by Dr. Dre on sale on their online store for $30-$80 off MSRP, depending on the item: – Powerbeats3 Wireless Earphones: $134, save $65 – BeatsX Earphones: $109, save $40 – Beats... Read more
Deals on clearance 15″ Apple MacBook Pros wit...
B&H Photo has clearance 2016 15″ MacBook Pros available for up to $800 off original MSRP. Shipping is free, and B&H charges NY & NJ sales tax only: – 15″ 2.7GHz Touch Bar MacBook Pro... Read more
Apple restocked Certified Refurbished 13″ Mac...
Apple has restocked a full line of Certified Refurbished 2017 13″ MacBook Airs starting at $849. An Apple one-year warranty is included with each MacBook, and shipping is free: – 13″ 1.8GHz/8GB/128GB... Read more
How to find the lowest prices on 2017 Apple M...
Apple has Certified Refurbished 13″ and 15″ 2017 MacBook Pros available for $200 to $420 off the cost of new models. Apple’s refurbished prices are the lowest available for each model from any... Read more

Jobs Board

*Apple* Retail - Multiple Positions - Apple,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Product Manager- *Apple* News - Apple (Unit...
# Product Manager- Apple News Job Number: 52399385 Santa Clara Valley, California, United States Posted: 19-Jan-2018 Weekly Hours: 40.00 **Job Summary** The Apple Read more
*Apple* Solutions Consultant - Apple (United...
# Apple Solutions Consultant Job Number: 113384559 Brandon, Florida, United States Posted: 10-Jan-2018 Weekly Hours: 40.00 **Job Summary** Are you passionate about Read more
Security Engineering Coordinator, *Apple* R...
# Security Engineering Coordinator, Apple Retail Job Number: 113237456 Santa Clara Valley, California, United States Posted: 18-Jan-2018 Weekly Hours: 40.00 **Job Read more
*Apple* Data Center Site Selection and Strat...
# Apple Data Center Site Selection and Strategy Research Analyst Job Number: 83708609 Santa Clara Valley, California, United States Posted: 18-Jan-2018 Weekly Hours: Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.