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<cbm/msbstring.a> defines macro to store a string with msb set in last character, <cbm/multicolor.a> defines macros to "paint" 4-color graphics via strings. git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@269 4df02467-bbd4-4a76-a152-e7ce94205b78
95 lines
3.0 KiB
Plaintext
95 lines
3.0 KiB
Plaintext
;ACME 0.97
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!ifdef lib_cbm_multicolor_a !eof
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lib_cbm_multicolor_a = 1
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; this file contains macros to convert strings into bit patterns.
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; the idea is to use four different characters to indicate the four
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; different bit patterns of multicolor graphics, so mc sprites can be
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; "drawn" in the source code even though ACME does not support any
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; four-based number system. see the end of this file for an example.
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; macro to set "digit" characters
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; example:
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; +mc_set " .o#"
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!macro mc_set .s {
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!if is_number(.s) or is_list(.s) {
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!error "Argument to +mc_set must be a string."
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} else if len(.s) != 4 {
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!error "Argument to +mc_set must be four characters."
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} else {
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!set multicolor_alphabet = .s
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}
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}
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; macro to convert string to number
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!macro mc_value ~.result, .in, .len {
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!ifndef multicolor_alphabet {
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!error "Called +mc_value before calling +mc_set."
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} else if is_number(.in) or is_list(.in) {
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!error "Argument to +mc_value must be a string."
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} else if len(.in) != .len {
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!error "Argument to +mc_value must have ", .len, " characters."
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} else {
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!set .result = 0
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!for .idx, 0, (.len / 2) - 1 {
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!set .char = .in[2 * .idx] ; get first of pair
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!if .char != .in[2 * .idx + 1] { ; compare to second
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!error "Characters in argument to +mc_value must be given in pairs."
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} else {
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!if .char = multicolor_alphabet[0] {
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!set .result = (.result << 2)
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} else if .char = multicolor_alphabet[1] {
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!set .result = (.result << 2) + 1
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} else if .char = multicolor_alphabet[2] {
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!set .result = (.result << 2) + 2
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} else if .char = multicolor_alphabet[3] {
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!set .result = (.result << 2) + 3
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} else {
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!error "Characters in argument to +mc_value must be from alphabet set via +mc_set."
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}
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}
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}
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}
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}
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; macro for a multicolor byte (for charsets)
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!macro mc_8 .in {
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+mc_value ~.result, .in, 8
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!by .result
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}
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; macro for a multicolor sprite line
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!macro mc_be24 .in {
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+mc_value ~.result, .in, 24
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!be24 .result
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}
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!eof
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; Here's an example on how to use this:
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!to "mc-sprites.prg", cbm
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*=$e00
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+mc_set " .o#" ; set four characters
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; and now use those four characters to "paint" the sprite:
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+mc_be24 " "
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+mc_be24 ".. .."
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+mc_be24 ".... ...."
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+mc_be24 "...... ##....## ......"
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+mc_be24 " .................... "
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+mc_be24 " .................... "
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+mc_be24 " ................ "
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+mc_be24 " ######........###### "
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+mc_be24 " ..oo####....####oo.. "
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+mc_be24 "##..oo ######## oo..##"
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+mc_be24 "....oo oo....oo oo...."
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+mc_be24 "......oooo....oooo......"
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+mc_be24 "........................"
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+mc_be24 "......oooo....oooo......"
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+mc_be24 "....oooooooooooooooo...."
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+mc_be24 ".... oooooooooooo ...."
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+mc_be24 ".. ####oooooooo#### .."
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+mc_be24 ".. ######oooo###### .."
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+mc_be24 " ###### #### "
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+mc_be24 " ###### ## "
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+mc_be24 " "
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