TV Text

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By: Chip Gracey (Parallax), created: 2013-04-17 | updated: 2013-04-17

This is a derivative of TV Terminal but uses the Propeller’s internal font and uses much less memory.

 

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Comments

[originally posted by Anonymous on 2010-11-10 23:44:41] TV_Text .str - ASCII values within the STRING() function I’m having a hard time understanding the parameters in the STRING() function as used with the TV_Text object.str method. In the example from TV_Text_Demo there is a line as follows where "text" is the name of the instantiation of the TV_Text object. text.str(STRING(13," TV Text Demo...",13,13,$C,5," OBJ and VAR require only 2.8KB ",$C,1)) which produces a white on blue first message and then a blue on green message followed by a CR. Analyzing the argument for STRING() I get: 13 is the cr prior to the text “ “ The text 13,13 two cr $C ? 5 ? “ “ second string of text $C ? 1 ? Some experimenting yields changes in color with changes in the $C and 5. I see the color palette listed in the DAT section of TV_text but I don’t see the correlation to $C or 5 in the list. I have tried to trace this back through the TV_Text.str and then to TV_Text.out and the TV_Text.print, but have not found an explanatory comment. Q1: Why two number systems? Why use hex for $C and dec for 5? I see $C can be replaced by 12 and it works. The 5 can be replaced with a $05 and the result is the same. Why not provide both values in the same number system? Q2 ASCII format code versus color Why does the TV_Text.str interpret $C (=12) as a color code? Why does it not interpret it as the ASCII format code 12 which is “paper feed”? That would be consistent with a code of 13 = ASCII format code for CR. Q3 Palette values I see the palette chart in the DAT of TV_Text but there is no entry for $C or 5 (although 5 is mentioned in the comments). Here is a section as an example DAT palette ' fore back ' color color byte $07, $0A '0 white / dark blue byte $3D, $3B '4 cyan / dark cyan byte $6B, $6E '5 green / gray-green byte $BB, $CE '6 red / pink Q4: order of arguments How does the TV_Text know which argument is for foreground color and which for background color? Much Thanks.