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Website| Monday, July 21, 2008 |
  Text viewports and sprites | ||
Posted - 7/21/2008 9:19:21 AM | ||
Back to work on the TI-83 Plus port of BBC BASIC! To complement the graphics viewport I've added support for text viewports — this lets you define the area the text console uses. The following VDU commands are now supported:
 The above screenshots defines the graphics viewport to fill the left hand side of the screen and shunts the text viewport over to the right half, using the following code: VDU 24,0;0;47;63; VDU 28,12,0,23,9 VDU 29,24;32;I've also added simple sprite drawing to BBC BASIC's PLOT command. PLOT usually takes a shape type and two coordinates, but for sprites (shapes 208..215) I've added an extra parameter - the address of the sprite data to use.  10 DIM ball 7 20 ball?0=&3C 30 ball?1=&5E 40 ball?2=&8F 50 ball?3=&DF 60 ball?4=&FF 70 ball?5=&FF 80 ball?6=&7E 90 ball?7=&3C 100 *REFRESH OFF 110 REPEAT 120 CLG 130 T=TIME/100 140 FOR P=0 TO 5 150 A=P/3*PI+T 160 X=16*SIN(A)+44 170 Y=16*COS(A)+28 180 PLOT 213,X,Y,ball 190 NEXT 200 *REFRESH 210 UNTIL INKEY(0)<>-1 220 *REFRESH ON The above code allocates 8 bytes of memory (DIM ball 7) then copies the sprite data to it by use of the ? indirection operator. This is a little laborious, so in reality you'd probably store your sprites in a binary file external to the main program, and might load them like this: 10 ball%=FN_loadSprite("SPRITES",0) 20 face%=FN_loadSprite("SPRITES",1) 30 *REFRESH OFF 40 REPEAT 50 CLG 60 T=TIME/100 70 FOR P=0 TO 5 80 A=P/3*PI+T 90 X=16*SIN(A)+44 100 Y=16*COS(A)+28 110 PLOT 213,X,Y,ball% 120 NEXT 130 PLOT 213,44,28,face% 140 *REFRESH 150 UNTIL INKEY(0)<>-1 160 *REFRESH ON 170 END 180 DEF FN_loadSprite(f$,i%) 190 fh%=OPENIN(f$) 200 PTR#fh%=i%*8 210 DIM spr 7 220 FOR j%=0 TO 7 230 spr?j%=BGET#fh% 240 NEXT j% 250 CLOSE#fh% 260 =spr 270 ENDPROC (Note FN_loadSprite() at the end of the program). The result is the following:  Next up: drawing text at the graphics cursor position (as sprites). | ||
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Comments
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Journal of benryves | |
 | Scet GDNet+
Member since: 8/3/2002 From: Mississauga, Ontario | |||
Posted - 7/21/2008 9:53:11 PM | ||||
| I've always been meaning to ask this, how long does it take you to make these journal entries? I assume you have some sort of automatic way of making all these animated gifs, but it still looks like they took a while. I'm not complaining, I like them. It makes this journal unique as you usually don't see so much animation in the others. | ||||
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 | benryves GDNet+
Member since: 9/4/2003 From: Purley, Greater London | |||
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Posted - 7/22/2008 5:54:18 AM | ||||
Quote:There are a number of tools to capture GIFs from emulators, either being external applications (such as TISShot for VTI) or built in (such as in PindurTI or Wabbitemu). It's just a case of hitting a button when you want to start recording and hitting it again when you're done, with the optional extra stage of further trimming or optimising in the GIF animation software of your choice.  | ||||
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