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

Capto 1.2.9 - $29.99
Capto (was Voila) is an easy-to-use app that takes capturing, recording, video and image editing to the next level. With an intelligent file manager and quick sharing options, Capto is perfect for... Read more
Opera 51.0.2830.40 - High-performance We...
Opera is a fast and secure browser trusted by millions of users. With the intuitive interface, Speed Dial and visual bookmarks for organizing favorite sites, news feature with fresh, relevant content... Read more
GarageSale 7.0.13 - Create outstanding e...
GarageSale is a slick, full-featured client application for the eBay online auction system. Create and manage your auctions with ease. With GarageSale, you can create, edit, track, and manage... Read more
1Password 6.8.7 - Powerful password mana...
1Password is a password manager that uniquely brings you both security and convenience. It is the only program that provides anti-phishing protection and goes beyond password management by adding Web... Read more
Evernote 7.0.1 - Create searchable notes...
Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at anytime, from... Read more
MacUpdate Desktop 6.2.0 - $20.00
MacUpdate Desktop brings seamless 1-click app installs and version updates to your Mac. With a free MacUpdate account and MacUpdate Desktop 6, Mac users can now install almost any Mac app on... Read more
HoudahSpot 4.3.5 - Advanced file-search...
HoudahSpot is a versatile desktop search tool. Use HoudahSpot to locate hard-to-find files and keep frequently used files within reach. HoudahSpot will immediately feel familiar. It works just the... Read more
EtreCheck 4.0.4 - For troubleshooting yo...
EtreCheck is an app that displays the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to... Read more
WhatsApp 0.2.8361 - Desktop client for W...
WhatsApp is the desktop client for WhatsApp Messenger, a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for... Read more
iClock 4.2 - Customize your menubar cloc...
iClock is a menu-bar replacement for Apple's default clock but with 100x features. Have your Apple or Google calendar in the menubar. Have the day, date, and time in different fonts and colors in the... Read more

Latest Forum Discussions

See All

The best games like Florence
Florence is a great little game about relationships that we absolutely adored. The only problem with it is it's over a little too soon. If you want some other games with some emotional range like Florence, check out these suggestions: [Read more] | Read more »
Angry Birds Champions adds cash prizes t...
Collaborating with developer Rovio Entertainment, GSN Games has released a twist on the Angry Birds formula. Angry Birds Champions features the same bird-flinging gameplay, but now you can catapult Red and co for cash. | Read more »
Around the Empire: What have you missed...
148Apps is part of a family. A big family of sites that make sure you're always up to date with all the portable gaming news. Just like a real family, I guess. I don't know, my mum never told me anything about Candy Crush to be fair. [Read more] | Read more »
The Battle of Polytopia Guide - Tips for...
The addition of multiplayer to The Battle of Polytopia has catapulted the game from a fun enough time waster to a fully-fledged 4X experience on your phone. We've been playing quite a few matches over the past week or so, and we've put together a... | Read more »
All the best games on sale for iPhone an...
Hi there, and welcome to our round up of all the best games that are on sale for iOS at the moment. It's not a vintage week in terms of numbers, but I'm pretty sure that every single one of these is worth picking up if you haven't already played... | Read more »
Disc Drivin' 2 Guide - Tips for the...
We're all still playing quite a bit of Disc Drivin' 2 over here at 148Apps, and we've gotten pretty good at it. Now that we've spent some more time with the game and unlocked more powerups, check out some of these more advanced tips: | Read more »
Alto's Odyssey Guide - How to Tackl...
Alto’s Odyssey is a completely stunning and serene runner, but it can also be a bit tricky. Check out these to try and keep your cool while playing this endless runner: Don’t focus too much on tasks [Read more] | Read more »
Here's everything you need to know...
Alto's Odyssey is a really, really good game. If you don't believe me, you should definitely check out our review by clicking this link right here. It takes the ideas from the original Alto's Adventure, then subtly builds on them, creating... | Read more »
Alto's Odyssey (Games)
Alto's Odyssey 1.0.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.1 (iTunes) Description: Just beyond the horizon sits a majestic desert, vast and unexplored. Join Alto and his friends and set off on an endless... | Read more »
Vainglory 5v5: Everything you need to kn...
Vainglory just got bigger. [Read more] | Read more »

Price Scanner via MacPrices.net

Sale! Amazon offers 13″ 2.3GHz MacBook Pros f...
Amazon has 2017 13″ 2.3GHz Apple MacBook Pros on sale today for $151-$150 off MSRP, each including free shipping: – 13″ 2.3GHz/128GB Space Gray MacBook Pro (MPXQ2LL/A): $1148 $151 off MSRP – 13″ 2.... Read more
Apple AirPods in stock today for $159, free s...
Adorama reports stock of Apple AirPods today for $159 including free shipping, plus pay no sales tax outside of NY & NJ. See our Apple AirPod Price Tracker for the latest prices and stock status... Read more
Saturday Sale: Amazon offers 12″ 1.3GHz MacBo...
Amazon has Silver and Gold 2017 12″ 1.3GHz Retina MacBooks on sale for $250 off MSRP. Shipping is free: – 12″ 1.3GHz Silver MacBook: $1349.99 $250 off MSRP – 12″ 1.3GHz Gold MacBook: $1349.99 $250... Read more
Use your Apple Education discount and save up...
Purchase a new Mac using Apple’s Education discount, and take up to $400 off MSRP. All teachers, students, and staff of any educational institution with a .edu email address qualify for the discount... Read more
Apple Canada offers 2017 21″ and 27″ iMacs fo...
 Canadian shoppers can save up to $470 on the purchase of a 2017 current-generation 21″ or 27″ iMac with Certified Refurbished models at Apple Canada. Apple’s refurbished prices are the lowest... Read more
9″ iPads available online at Walmart for $50...
Walmart has 9.7″ Apple iPads on sale for $50 off MSRP for a limited time. Sale prices are for online orders only, in-store prices may vary: – 9″ 32GB iPad: $279.99 $50 off – 9″ 128GB iPad: $379.99 $... Read more
15″ Apple MacBook Pros, Certified Refurbished...
Save $360-$420 on the purchase of a 2017 15″ MacBook Pro with Certified Refurbished models at Apple. Apple’s refurbished prices are the lowest available for each model from any reseller. An standard... Read more
Amazon restocks MacBook Pros with models avai...
Amazon has restocked 15″ and 13″ Apple MacBook Pros with models on sale for up to $251 off MSRP. Shipping is free. Note that stock of some Macs may come and go (and some sell out quickly), so check... Read more
Lowest price of the year: 15″ 2.8GHz Apple Ma...
Amazon has the 2017 Space Gray 15″ 2.8GHz MacBook Pro on sale today for $251 off MSRP. Shipping is free: – 15″ 2.8GHz Touch Bar MacBook Pro Space Gray (MPTR2LL/A): $2148, $251 off MSRP Their price is... Read more
Apple restocks full line of Certified Refurbi...
Apple has restocked a full line of Apple Certified Refurbished 2017 13″ MacBook Pros for $200-$300 off MSRP. A standard Apple one-year warranty is included with each MacBook, and shipping is free.... Read more

Jobs Board

*Apple* Media Products Commerce Engineering...
# Apple Media Products Commerce Engineering Manager Job Number: 56207285 Santa Clara Valley, California, United States Posted: 26-Jan-2018 Weekly Hours: 40.00 **Job Read more
Digital Platforms Lead, Today at *Apple* -...
# Digital Platforms Lead, Today at Apple Job Number: 56178747 Santa Clara Valley, California, United States Posted: 23-Feb-2018 Weekly Hours: 40.00 **Job Summary** Read more
*Apple* Retail - Multiple Positions - Apple,...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*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
*Apple* Retail - Multiple Positions - Apple,...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.