Home » Archimedes archive » Acorn User » AU 1998-08.adf » Regulars » StarInfo/Mellor/!BBC1/!Help/HelpText
StarInfo/Mellor/!BBC1/!Help/HelpText
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Acorn User » AU 1998-08.adf » Regulars |
| Filename: | StarInfo/Mellor/!BBC1/!Help/HelpText |
| Read OK: | ✔ |
| File size: | 0DB0 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
The BBC1 Balloon Programmed by Philip Mellor E-mail: yr92pm4@hors4th.demon.co.uk This program supports Interactive Help. What is it? After Owain Cole's 'Channel 5 logo' program in the March 98 Acorn User, and a request for any other TV station identifiers, I set about recreating the BBC balloon! A few hours later this program was the result. Just double-click the !BBC1 icon if you haven't already and enjoy the full potential of your licence fee. Piloting your balloon You can move the balloon about by dragging it with ADJUST. You can change the direction it moves in using the control panel (see below). The control panel Clicking SELECT on the balloon opens the control panel window. This gives a number of options: Direction You can change the direction of the balloon by clicking on the arrows. The centre circle stops the balloon from moving. Bounce off sides When this is selected, the balloon can bounce off the left and right edges of the screen. When it is unselected, the balloon can drift off one edge of the screen to the other. Change direction When selected, the balloon can change direction from time to time. When unselected, it won't. Rotate balloon When selected, the balloon rotates - it can slow the desktop down slightly so you may wish to turn this option off. Speed This shows the speed of the program. You can change it by clicking SELECT, choosing between 'Fastest', 'Fast', 'Medium', 'Slow' and 'Slowest'. For the techies, this alters the number of null polls between updating the balloon window. How it works The world map is scaled and distorted, line by line using a series of graphics windows, to produce the curved effect of the balloon. The balloon sprite, with a circular mask for the map to show through, is then overlayed. The balloon rotates by scrolling the map sprite to the right using RECTANGLE TO. All this is done in 'real time' (ie. slowly and inefficiently! :-) I suppose I could have used pre-rendered sprites, but that would have made the program use HUGE amounts of memory. :-( The RunImage file has been compressed to squeeze just that little extra speed from my ARM250 - this also has the problem of making the program unreadable by people, so I've included the original unsquished file "Unsquished". Customising your balloon This is probably best done by editing the 'BBCone' and 'BBCone22' files in the !BBC1.Balloons directory - but be careful not to lose the originals! Basically, the 'canvas' sprite is the one that is stretched to fit the balloon. Leave three columns of pixels at the left hand edge - these are used as a workspace for the scrolling/rotation. The 'balloon' sprite is the outside of the balloon. Fill the centre of the balloon with a mask to create a hole for the 'canvas' to show through. Finally, the 'mask' sprite can be created by copying the 'balloon' sprite and filling all the foreground to one colour and all the background with the mask. The hole for the canvas should be filled with colour and not with a mask. All that might sound complicated, but using the BBC 1 balloon as an example it should all begin to make sense! See the !Run file for more information about loading different sprite files into the program. Contacting me You can contact the author, Philip Mellor, via e-mail at: yr92pm4@hors4th.demon.co.uk This is my school e-mail address, so I can only access it during term-time, although I do practically live in the computer room so there's a good chance any mail will be read!
00000000 14 54 68 65 20 42 42 43 31 20 42 61 6c 6c 6f 6f |.The BBC1 Balloo| 00000010 6e 0a 50 72 6f 67 72 61 6d 6d 65 64 20 62 79 20 |n.Programmed by | 00000020 50 68 69 6c 69 70 20 4d 65 6c 6c 6f 72 0a 45 2d |Philip Mellor.E-| 00000030 6d 61 69 6c 3a 20 79 72 39 32 70 6d 34 40 68 6f |mail: yr92pm4@ho| 00000040 72 73 34 74 68 2e 64 65 6d 6f 6e 2e 63 6f 2e 75 |rs4th.demon.co.u| 00000050 6b 0a 0a 02 54 68 69 73 20 70 72 6f 67 72 61 6d |k...This program| 00000060 20 73 75 70 70 6f 72 74 73 20 49 6e 74 65 72 61 | supports Intera| 00000070 63 74 69 76 65 20 48 65 6c 70 2e 0a 0a 14 57 68 |ctive Help....Wh| 00000080 61 74 20 69 73 20 69 74 3f 0a 41 66 74 65 72 20 |at is it?.After | 00000090 4f 77 61 69 6e 20 43 6f 6c 65 27 73 20 27 43 68 |Owain Cole's 'Ch| 000000a0 61 6e 6e 65 6c 20 35 20 6c 6f 67 6f 27 20 70 72 |annel 5 logo' pr| 000000b0 6f 67 72 61 6d 20 69 6e 20 74 68 65 20 4d 61 72 |ogram in the Mar| 000000c0 63 68 20 39 38 20 41 63 6f 72 6e 20 55 73 65 72 |ch 98 Acorn User| 000000d0 2c 20 61 6e 64 20 61 20 72 65 71 75 65 73 74 20 |, and a request | 000000e0 66 6f 72 20 61 6e 79 20 6f 74 68 65 72 20 54 56 |for any other TV| 000000f0 20 73 74 61 74 69 6f 6e 20 69 64 65 6e 74 69 66 | station identif| 00000100 69 65 72 73 2c 20 49 20 73 65 74 20 61 62 6f 75 |iers, I set abou| 00000110 74 20 72 65 63 72 65 61 74 69 6e 67 20 74 68 65 |t recreating the| 00000120 20 42 42 43 20 62 61 6c 6c 6f 6f 6e 21 20 41 20 | BBC balloon! A | 00000130 66 65 77 20 68 6f 75 72 73 20 6c 61 74 65 72 20 |few hours later | 00000140 74 68 69 73 20 70 72 6f 67 72 61 6d 20 77 61 73 |this program was| 00000150 20 74 68 65 20 72 65 73 75 6c 74 2e 20 4a 75 73 | the result. Jus| 00000160 74 20 64 6f 75 62 6c 65 2d 63 6c 69 63 6b 20 74 |t double-click t| 00000170 68 65 20 21 42 42 43 31 20 69 63 6f 6e 20 69 66 |he !BBC1 icon if| 00000180 20 79 6f 75 20 68 61 76 65 6e 27 74 20 61 6c 72 | you haven't alr| 00000190 65 61 64 79 20 61 6e 64 20 65 6e 6a 6f 79 20 74 |eady and enjoy t| 000001a0 68 65 20 66 75 6c 6c 20 70 6f 74 65 6e 74 69 61 |he full potentia| 000001b0 6c 20 6f 66 20 79 6f 75 72 20 6c 69 63 65 6e 63 |l of your licenc| 000001c0 65 20 66 65 65 2e 0a 0a 14 50 69 6c 6f 74 69 6e |e fee....Pilotin| 000001d0 67 20 79 6f 75 72 20 62 61 6c 6c 6f 6f 6e 0a 59 |g your balloon.Y| 000001e0 6f 75 20 63 61 6e 20 6d 6f 76 65 20 74 68 65 20 |ou can move the | 000001f0 62 61 6c 6c 6f 6f 6e 20 61 62 6f 75 74 20 62 79 |balloon about by| 00000200 20 64 72 61 67 67 69 6e 67 20 69 74 20 77 69 74 | dragging it wit| 00000210 68 20 41 44 4a 55 53 54 2e 20 59 6f 75 20 63 61 |h ADJUST. You ca| 00000220 6e 20 63 68 61 6e 67 65 20 74 68 65 20 64 69 72 |n change the dir| 00000230 65 63 74 69 6f 6e 20 69 74 20 6d 6f 76 65 73 20 |ection it moves | 00000240 69 6e 20 75 73 69 6e 67 20 74 68 65 20 63 6f 6e |in using the con| 00000250 74 72 6f 6c 20 70 61 6e 65 6c 20 28 73 65 65 20 |trol panel (see | 00000260 62 65 6c 6f 77 29 2e 0a 0a 02 54 68 65 20 63 6f |below)....The co| 00000270 6e 74 72 6f 6c 20 70 61 6e 65 6c 0a 43 6c 69 63 |ntrol panel.Clic| 00000280 6b 69 6e 67 20 53 45 4c 45 43 54 20 6f 6e 20 74 |king SELECT on t| 00000290 68 65 20 62 61 6c 6c 6f 6f 6e 20 6f 70 65 6e 73 |he balloon opens| 000002a0 20 74 68 65 20 63 6f 6e 74 72 6f 6c 20 70 61 6e | the control pan| 000002b0 65 6c 20 77 69 6e 64 6f 77 2e 20 54 68 69 73 20 |el window. This | 000002c0 67 69 76 65 73 20 61 20 6e 75 6d 62 65 72 20 6f |gives a number o| 000002d0 66 20 6f 70 74 69 6f 6e 73 3a 0a 0a 02 44 69 72 |f options:...Dir| 000002e0 65 63 74 69 6f 6e 0a 59 6f 75 20 63 61 6e 20 63 |ection.You can c| 000002f0 68 61 6e 67 65 20 74 68 65 20 64 69 72 65 63 74 |hange the direct| 00000300 69 6f 6e 20 6f 66 20 74 68 65 20 62 61 6c 6c 6f |ion of the ballo| 00000310 6f 6e 20 62 79 20 63 6c 69 63 6b 69 6e 67 20 6f |on by clicking o| 00000320 6e 20 74 68 65 20 61 72 72 6f 77 73 2e 20 54 68 |n the arrows. Th| 00000330 65 20 63 65 6e 74 72 65 20 63 69 72 63 6c 65 20 |e centre circle | 00000340 73 74 6f 70 73 20 74 68 65 20 62 61 6c 6c 6f 6f |stops the balloo| 00000350 6e 20 66 72 6f 6d 20 6d 6f 76 69 6e 67 2e 0a 0a |n from moving...| 00000360 02 42 6f 75 6e 63 65 20 6f 66 66 20 73 69 64 65 |.Bounce off side| 00000370 73 0a 57 68 65 6e 20 74 68 69 73 20 69 73 20 73 |s.When this is s| 00000380 65 6c 65 63 74 65 64 2c 20 74 68 65 20 62 61 6c |elected, the bal| 00000390 6c 6f 6f 6e 20 63 61 6e 20 62 6f 75 6e 63 65 20 |loon can bounce | 000003a0 6f 66 66 20 74 68 65 20 6c 65 66 74 20 61 6e 64 |off the left and| 000003b0 20 72 69 67 68 74 20 65 64 67 65 73 20 6f 66 20 | right edges of | 000003c0 74 68 65 20 73 63 72 65 65 6e 2e 20 57 68 65 6e |the screen. When| 000003d0 20 69 74 20 69 73 20 75 6e 73 65 6c 65 63 74 65 | it is unselecte| 000003e0 64 2c 20 74 68 65 20 62 61 6c 6c 6f 6f 6e 20 63 |d, the balloon c| 000003f0 61 6e 20 64 72 69 66 74 20 6f 66 66 20 6f 6e 65 |an drift off one| 00000400 20 65 64 67 65 20 6f 66 20 74 68 65 20 73 63 72 | edge of the scr| 00000410 65 65 6e 20 74 6f 20 74 68 65 20 6f 74 68 65 72 |een to the other| 00000420 2e 0a 0a 02 43 68 61 6e 67 65 20 64 69 72 65 63 |....Change direc| 00000430 74 69 6f 6e 0a 57 68 65 6e 20 73 65 6c 65 63 74 |tion.When select| 00000440 65 64 2c 20 74 68 65 20 62 61 6c 6c 6f 6f 6e 20 |ed, the balloon | 00000450 63 61 6e 20 63 68 61 6e 67 65 20 64 69 72 65 63 |can change direc| 00000460 74 69 6f 6e 20 66 72 6f 6d 20 74 69 6d 65 20 74 |tion from time t| 00000470 6f 20 74 69 6d 65 2e 20 57 68 65 6e 20 75 6e 73 |o time. When uns| 00000480 65 6c 65 63 74 65 64 2c 20 69 74 20 77 6f 6e 27 |elected, it won'| 00000490 74 2e 0a 0a 02 52 6f 74 61 74 65 20 62 61 6c 6c |t....Rotate ball| 000004a0 6f 6f 6e 0a 57 68 65 6e 20 73 65 6c 65 63 74 65 |oon.When selecte| 000004b0 64 2c 20 74 68 65 20 62 61 6c 6c 6f 6f 6e 20 72 |d, the balloon r| 000004c0 6f 74 61 74 65 73 20 2d 20 69 74 20 63 61 6e 20 |otates - it can | 000004d0 73 6c 6f 77 20 74 68 65 20 64 65 73 6b 74 6f 70 |slow the desktop| 000004e0 20 64 6f 77 6e 20 73 6c 69 67 68 74 6c 79 20 73 | down slightly s| 000004f0 6f 20 79 6f 75 20 6d 61 79 20 77 69 73 68 20 74 |o you may wish t| 00000500 6f 20 74 75 72 6e 20 74 68 69 73 20 6f 70 74 69 |o turn this opti| 00000510 6f 6e 20 6f 66 66 2e 0a 0a 02 53 70 65 65 64 0a |on off....Speed.| 00000520 54 68 69 73 20 73 68 6f 77 73 20 74 68 65 20 73 |This shows the s| 00000530 70 65 65 64 20 6f 66 20 74 68 65 20 70 72 6f 67 |peed of the prog| 00000540 72 61 6d 2e 20 59 6f 75 20 63 61 6e 20 63 68 61 |ram. You can cha| 00000550 6e 67 65 20 69 74 20 62 79 20 63 6c 69 63 6b 69 |nge it by clicki| 00000560 6e 67 20 53 45 4c 45 43 54 2c 20 63 68 6f 6f 73 |ng SELECT, choos| 00000570 69 6e 67 20 62 65 74 77 65 65 6e 20 27 46 61 73 |ing between 'Fas| 00000580 74 65 73 74 27 2c 20 27 46 61 73 74 27 2c 20 27 |test', 'Fast', '| 00000590 4d 65 64 69 75 6d 27 2c 20 27 53 6c 6f 77 27 20 |Medium', 'Slow' | 000005a0 61 6e 64 20 27 53 6c 6f 77 65 73 74 27 2e 20 46 |and 'Slowest'. F| 000005b0 6f 72 20 74 68 65 20 74 65 63 68 69 65 73 2c 20 |or the techies, | 000005c0 74 68 69 73 20 61 6c 74 65 72 73 20 74 68 65 20 |this alters the | 000005d0 6e 75 6d 62 65 72 20 6f 66 20 6e 75 6c 6c 20 70 |number of null p| 000005e0 6f 6c 6c 73 20 62 65 74 77 65 65 6e 20 75 70 64 |olls between upd| 000005f0 61 74 69 6e 67 20 74 68 65 20 62 61 6c 6c 6f 6f |ating the balloo| 00000600 6e 20 77 69 6e 64 6f 77 2e 0a 0a 14 48 6f 77 20 |n window....How | 00000610 69 74 20 77 6f 72 6b 73 0a 54 68 65 20 77 6f 72 |it works.The wor| 00000620 6c 64 20 6d 61 70 20 69 73 20 73 63 61 6c 65 64 |ld map is scaled| 00000630 20 61 6e 64 20 64 69 73 74 6f 72 74 65 64 2c 20 | and distorted, | 00000640 6c 69 6e 65 20 62 79 20 6c 69 6e 65 20 75 73 69 |line by line usi| 00000650 6e 67 20 61 20 73 65 72 69 65 73 20 6f 66 20 67 |ng a series of g| 00000660 72 61 70 68 69 63 73 20 77 69 6e 64 6f 77 73 2c |raphics windows,| 00000670 20 74 6f 20 70 72 6f 64 75 63 65 20 74 68 65 20 | to produce the | 00000680 63 75 72 76 65 64 20 65 66 66 65 63 74 20 6f 66 |curved effect of| 00000690 20 74 68 65 20 62 61 6c 6c 6f 6f 6e 2e 20 54 68 | the balloon. Th| 000006a0 65 20 62 61 6c 6c 6f 6f 6e 20 73 70 72 69 74 65 |e balloon sprite| 000006b0 2c 20 77 69 74 68 20 61 20 63 69 72 63 75 6c 61 |, with a circula| 000006c0 72 20 6d 61 73 6b 20 66 6f 72 20 74 68 65 20 6d |r mask for the m| 000006d0 61 70 20 74 6f 20 73 68 6f 77 20 74 68 72 6f 75 |ap to show throu| 000006e0 67 68 2c 20 69 73 20 74 68 65 6e 20 6f 76 65 72 |gh, is then over| 000006f0 6c 61 79 65 64 2e 20 54 68 65 20 62 61 6c 6c 6f |layed. The ballo| 00000700 6f 6e 20 72 6f 74 61 74 65 73 20 62 79 20 73 63 |on rotates by sc| 00000710 72 6f 6c 6c 69 6e 67 20 74 68 65 20 6d 61 70 20 |rolling the map | 00000720 73 70 72 69 74 65 20 74 6f 20 74 68 65 20 72 69 |sprite to the ri| 00000730 67 68 74 20 75 73 69 6e 67 20 52 45 43 54 41 4e |ght using RECTAN| 00000740 47 4c 45 20 54 4f 2e 20 41 6c 6c 20 74 68 69 73 |GLE TO. All this| 00000750 20 69 73 20 64 6f 6e 65 20 69 6e 20 27 72 65 61 | is done in 'rea| 00000760 6c 20 74 69 6d 65 27 20 28 69 65 2e 20 73 6c 6f |l time' (ie. slo| 00000770 77 6c 79 20 61 6e 64 20 69 6e 65 66 66 69 63 69 |wly and ineffici| 00000780 65 6e 74 6c 79 21 20 3a 2d 29 20 49 20 73 75 70 |ently! :-) I sup| 00000790 70 6f 73 65 20 49 20 63 6f 75 6c 64 20 68 61 76 |pose I could hav| 000007a0 65 20 75 73 65 64 20 70 72 65 2d 72 65 6e 64 65 |e used pre-rende| 000007b0 72 65 64 20 73 70 72 69 74 65 73 2c 20 62 75 74 |red sprites, but| 000007c0 20 74 68 61 74 20 77 6f 75 6c 64 20 68 61 76 65 | that would have| 000007d0 20 6d 61 64 65 20 74 68 65 20 70 72 6f 67 72 61 | made the progra| 000007e0 6d 20 75 73 65 20 48 55 47 45 20 61 6d 6f 75 6e |m use HUGE amoun| 000007f0 74 73 20 6f 66 20 6d 65 6d 6f 72 79 2e 20 3a 2d |ts of memory. :-| 00000800 28 0a 0a 54 68 65 20 52 75 6e 49 6d 61 67 65 20 |(..The RunImage | 00000810 66 69 6c 65 20 68 61 73 20 62 65 65 6e 20 63 6f |file has been co| 00000820 6d 70 72 65 73 73 65 64 20 74 6f 20 73 71 75 65 |mpressed to sque| 00000830 65 7a 65 20 6a 75 73 74 20 74 68 61 74 20 6c 69 |eze just that li| 00000840 74 74 6c 65 20 65 78 74 72 61 20 73 70 65 65 64 |ttle extra speed| 00000850 20 66 72 6f 6d 20 6d 79 20 41 52 4d 32 35 30 20 | from my ARM250 | 00000860 2d 20 74 68 69 73 20 61 6c 73 6f 20 68 61 73 20 |- this also has | 00000870 74 68 65 20 70 72 6f 62 6c 65 6d 20 6f 66 20 6d |the problem of m| 00000880 61 6b 69 6e 67 20 74 68 65 20 70 72 6f 67 72 61 |aking the progra| 00000890 6d 20 75 6e 72 65 61 64 61 62 6c 65 20 62 79 20 |m unreadable by | 000008a0 70 65 6f 70 6c 65 2c 20 73 6f 20 49 27 76 65 20 |people, so I've | 000008b0 69 6e 63 6c 75 64 65 64 20 74 68 65 20 6f 72 69 |included the ori| 000008c0 67 69 6e 61 6c 20 75 6e 73 71 75 69 73 68 65 64 |ginal unsquished| 000008d0 20 66 69 6c 65 20 22 55 6e 73 71 75 69 73 68 65 | file "Unsquishe| 000008e0 64 22 2e 0a 0a 14 43 75 73 74 6f 6d 69 73 69 6e |d"....Customisin| 000008f0 67 20 79 6f 75 72 20 62 61 6c 6c 6f 6f 6e 0a 54 |g your balloon.T| 00000900 68 69 73 20 69 73 20 70 72 6f 62 61 62 6c 79 20 |his is probably | 00000910 62 65 73 74 20 64 6f 6e 65 20 62 79 20 65 64 69 |best done by edi| 00000920 74 69 6e 67 20 74 68 65 20 27 42 42 43 6f 6e 65 |ting the 'BBCone| 00000930 27 20 61 6e 64 20 27 42 42 43 6f 6e 65 32 32 27 |' and 'BBCone22'| 00000940 20 66 69 6c 65 73 20 69 6e 20 74 68 65 20 21 42 | files in the !B| 00000950 42 43 31 2e 42 61 6c 6c 6f 6f 6e 73 20 64 69 72 |BC1.Balloons dir| 00000960 65 63 74 6f 72 79 20 2d 20 62 75 74 20 62 65 20 |ectory - but be | 00000970 63 61 72 65 66 75 6c 20 6e 6f 74 20 74 6f 20 6c |careful not to l| 00000980 6f 73 65 20 74 68 65 20 6f 72 69 67 69 6e 61 6c |ose the original| 00000990 73 21 20 42 61 73 69 63 61 6c 6c 79 2c 20 74 68 |s! Basically, th| 000009a0 65 20 27 63 61 6e 76 61 73 27 20 73 70 72 69 74 |e 'canvas' sprit| 000009b0 65 20 69 73 20 74 68 65 20 6f 6e 65 20 74 68 61 |e is the one tha| 000009c0 74 20 69 73 20 73 74 72 65 74 63 68 65 64 20 74 |t is stretched t| 000009d0 6f 20 66 69 74 20 74 68 65 20 62 61 6c 6c 6f 6f |o fit the balloo| 000009e0 6e 2e 20 4c 65 61 76 65 20 74 68 72 65 65 20 63 |n. Leave three c| 000009f0 6f 6c 75 6d 6e 73 20 6f 66 20 70 69 78 65 6c 73 |olumns of pixels| 00000a00 20 61 74 20 74 68 65 20 6c 65 66 74 20 68 61 6e | at the left han| 00000a10 64 20 65 64 67 65 20 2d 20 74 68 65 73 65 20 61 |d edge - these a| 00000a20 72 65 20 75 73 65 64 20 61 73 20 61 20 77 6f 72 |re used as a wor| 00000a30 6b 73 70 61 63 65 20 66 6f 72 20 74 68 65 20 73 |kspace for the s| 00000a40 63 72 6f 6c 6c 69 6e 67 2f 72 6f 74 61 74 69 6f |crolling/rotatio| 00000a50 6e 2e 20 54 68 65 20 27 62 61 6c 6c 6f 6f 6e 27 |n. The 'balloon'| 00000a60 20 73 70 72 69 74 65 20 69 73 20 74 68 65 20 6f | sprite is the o| 00000a70 75 74 73 69 64 65 20 6f 66 20 74 68 65 20 62 61 |utside of the ba| 00000a80 6c 6c 6f 6f 6e 2e 20 46 69 6c 6c 20 74 68 65 20 |lloon. Fill the | 00000a90 63 65 6e 74 72 65 20 6f 66 20 74 68 65 20 62 61 |centre of the ba| 00000aa0 6c 6c 6f 6f 6e 20 77 69 74 68 20 61 20 6d 61 73 |lloon with a mas| 00000ab0 6b 20 74 6f 20 63 72 65 61 74 65 20 61 20 68 6f |k to create a ho| 00000ac0 6c 65 20 66 6f 72 20 74 68 65 20 27 63 61 6e 76 |le for the 'canv| 00000ad0 61 73 27 20 74 6f 20 73 68 6f 77 20 74 68 72 6f |as' to show thro| 00000ae0 75 67 68 2e 20 46 69 6e 61 6c 6c 79 2c 20 74 68 |ugh. Finally, th| 00000af0 65 20 27 6d 61 73 6b 27 20 73 70 72 69 74 65 20 |e 'mask' sprite | 00000b00 63 61 6e 20 62 65 20 63 72 65 61 74 65 64 20 62 |can be created b| 00000b10 79 20 63 6f 70 79 69 6e 67 20 74 68 65 20 27 62 |y copying the 'b| 00000b20 61 6c 6c 6f 6f 6e 27 20 73 70 72 69 74 65 20 61 |alloon' sprite a| 00000b30 6e 64 20 66 69 6c 6c 69 6e 67 20 61 6c 6c 20 74 |nd filling all t| 00000b40 68 65 20 66 6f 72 65 67 72 6f 75 6e 64 20 74 6f |he foreground to| 00000b50 20 6f 6e 65 20 63 6f 6c 6f 75 72 20 61 6e 64 20 | one colour and | 00000b60 61 6c 6c 20 74 68 65 20 62 61 63 6b 67 72 6f 75 |all the backgrou| 00000b70 6e 64 20 77 69 74 68 20 74 68 65 20 6d 61 73 6b |nd with the mask| 00000b80 2e 20 54 68 65 20 68 6f 6c 65 20 66 6f 72 20 74 |. The hole for t| 00000b90 68 65 20 63 61 6e 76 61 73 20 73 68 6f 75 6c 64 |he canvas should| 00000ba0 20 62 65 20 66 69 6c 6c 65 64 20 77 69 74 68 20 | be filled with | 00000bb0 63 6f 6c 6f 75 72 20 61 6e 64 20 6e 6f 74 20 77 |colour and not w| 00000bc0 69 74 68 20 61 20 6d 61 73 6b 2e 0a 41 6c 6c 20 |ith a mask..All | 00000bd0 74 68 61 74 20 6d 69 67 68 74 20 73 6f 75 6e 64 |that might sound| 00000be0 20 63 6f 6d 70 6c 69 63 61 74 65 64 2c 20 62 75 | complicated, bu| 00000bf0 74 20 75 73 69 6e 67 20 74 68 65 20 42 42 43 20 |t using the BBC | 00000c00 31 20 62 61 6c 6c 6f 6f 6e 20 61 73 20 61 6e 20 |1 balloon as an | 00000c10 65 78 61 6d 70 6c 65 20 69 74 20 73 68 6f 75 6c |example it shoul| 00000c20 64 20 61 6c 6c 20 62 65 67 69 6e 20 74 6f 20 6d |d all begin to m| 00000c30 61 6b 65 20 73 65 6e 73 65 21 0a 53 65 65 20 74 |ake sense!.See t| 00000c40 68 65 20 21 52 75 6e 20 66 69 6c 65 20 66 6f 72 |he !Run file for| 00000c50 20 6d 6f 72 65 20 69 6e 66 6f 72 6d 61 74 69 6f | more informatio| 00000c60 6e 20 61 62 6f 75 74 20 6c 6f 61 64 69 6e 67 20 |n about loading | 00000c70 64 69 66 66 65 72 65 6e 74 20 73 70 72 69 74 65 |different sprite| 00000c80 20 66 69 6c 65 73 20 69 6e 74 6f 20 74 68 65 20 | files into the | 00000c90 70 72 6f 67 72 61 6d 2e 0a 0a 14 43 6f 6e 74 61 |program....Conta| 00000ca0 63 74 69 6e 67 20 6d 65 0a 59 6f 75 20 63 61 6e |cting me.You can| 00000cb0 20 63 6f 6e 74 61 63 74 20 74 68 65 20 61 75 74 | contact the aut| 00000cc0 68 6f 72 2c 20 50 68 69 6c 69 70 20 4d 65 6c 6c |hor, Philip Mell| 00000cd0 6f 72 2c 20 76 69 61 20 65 2d 6d 61 69 6c 20 61 |or, via e-mail a| 00000ce0 74 3a 0a 02 79 72 39 32 70 6d 34 40 68 6f 72 73 |t:..yr92pm4@hors| 00000cf0 34 74 68 2e 64 65 6d 6f 6e 2e 63 6f 2e 75 6b 0a |4th.demon.co.uk.| 00000d00 54 68 69 73 20 69 73 20 6d 79 20 73 63 68 6f 6f |This is my schoo| 00000d10 6c 20 65 2d 6d 61 69 6c 20 61 64 64 72 65 73 73 |l e-mail address| 00000d20 2c 20 73 6f 20 49 20 63 61 6e 20 6f 6e 6c 79 20 |, so I can only | 00000d30 61 63 63 65 73 73 20 69 74 20 64 75 72 69 6e 67 |access it during| 00000d40 20 74 65 72 6d 2d 74 69 6d 65 2c 20 61 6c 74 68 | term-time, alth| 00000d50 6f 75 67 68 20 49 20 64 6f 20 70 72 61 63 74 69 |ough I do practi| 00000d60 63 61 6c 6c 79 20 6c 69 76 65 20 69 6e 20 74 68 |cally live in th| 00000d70 65 20 63 6f 6d 70 75 74 65 72 20 72 6f 6f 6d 20 |e computer room | 00000d80 73 6f 20 74 68 65 72 65 27 73 20 61 20 67 6f 6f |so there's a goo| 00000d90 64 20 63 68 61 6e 63 65 20 61 6e 79 20 6d 61 69 |d chance any mai| 00000da0 6c 20 77 69 6c 6c 20 62 65 20 72 65 61 64 21 0a |l will be read!.| 00000db0
.