GalaforceAtomDevDiary

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	*Score digits (line 1) are stored in DIGITS.INC		*Score digits (line 1) are stored in DIGITS.INC
	*The size of a digit is 6x8 pixels		*The size of a digit is 6x8 pixels
-	*A digit in DIGITS.INC is a byte copy of the digit in screen	+	*A digit in DIGITS.INC is an image of the digit on screen
	====Stars====		====Stars====

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Revision as of 16:49, 17 August 2011

Contents 1 Galaforce Acorn Atom Development Diary 1.1 Program 1.1.1 Font 1.1.2 Pixel 1.1.3 Score 1.1.4 Stars 1.2 Screenshots

Galaforce Acorn Atom Development Diary

by Kees van Oss

16 August 2011

Program

Font

• The textfont is stored in the SPFONT.INC file.
• You can print single- (CHARP.INC) or double size characters (TITLE.INC).
• Double size characters prints all pixels and rows double.
• Every pixel is shifted out of the Storage byte and put on screen as a coloured pixel.
• A letter (5 x 8) is stored 90 degrees rotated (8 x 5).

The letter G is stored like this:

Pixel

• A pixel is plotted on the screen as a coloured pixel.
• Below you can find a table with the difference between a BBC and an Atom coloured pixel:

	BBC MODE2	BBC MODE5	Atom CLEAR4a
Colours/pixel	16	4	4
Bits/pixel	4	2	2
Pixels/byte	2	4	4

Score

• Score digits (line 1) are stored in DIGITS.INC
• The size of a digit is 6x8 pixels
• A digit in DIGITS.INC is an image of the digit on screen

Stars

Screenshots

Galaforce Intro screenshot Posted: 16:22, 17 Aug 2011

Galaforce High Score screenshot Posted: 16:22, 17 Aug 2011