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Fix formatting

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Andy McFadden 2019-08-29 10:44:15 -07:00 committed by GitHub
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docs/demos.md
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@ -64,7 +64,7 @@ The EXTRAS directory has some additional software that isn't "officially"
part of fdraw, but may be of use.
NOTE: some of these assume fdraw and amperfdraw are already loaded, and
will hang if not. Run DEMO and hit <esc> before running these.
will hang if not. Run DEMO and hit &lt;esc&gt; before running these.
* ARRAY.EXAMPLE : The &PLOT example from the documentation.
@ -109,12 +109,12 @@ Applesoft BASIC. To generate strings, add a series of statements that set
variables and call 20000 to add rendered strings to the set. The relevant
variables are:
S$ - string to add
DW - desired width, in pixels, of a cell 1.0 units wide
DH - desired height, in pixels of a cell 2.0 units high (ascent + descent)
IS% - inter-character spacing, in pixels
SW% - width of the space character (usually same as DW)
MO% - monospace flag; if nonzero, all chars are treated as 1.0 units wide
* S$ - string to add
* DW - desired width, in pixels, of a cell 1.0 units wide
* DH - desired height, in pixels of a cell 2.0 units high (ascent + descent)
* IS% - inter-character spacing, in pixels
* SW% - width of the space character (usually same as DW)
* MO% - monospace flag; if nonzero, all chars are treated as 1.0 units wide
Remove the REM from the start of line 1010 to enable the character viewer.
At present only a couple of lower-case letters are defined.
@ -125,26 +125,26 @@ At present only a couple of lower-case letters are defined.
The LINEFONT program outputs a binary blob that can be passed to
the &PLOT array-draw function. The file structure is:
+0 byte - number of array sets in the list.
+1 2 bytes * N - table of offsets to individual array sets. One of
these per array set. The value is the offset from the start of the
file.
+0 byte - number of array sets in the list.
+1 2 bytes * N - table of offsets to individual array sets. One of
these per array set. The value is the offset from the start of the
file.
(2N+1) array set #1:
+0 byte - number of vertices (0-127)
+1 byte - number of index pairs (0-127)
+2 2 bytes * V - vertices (values are signed X/Y)
+X 2 bytes * I - index pairs (values are 0-127)
(2N+1) array set #1:
+0 byte - number of vertices (0-127)
+1 byte - number of index pairs (0-127)
+2 2 bytes * V - vertices (values are signed X/Y)
+X 2 bytes * I - index pairs (values are 0-127)
To display phrase #3, you would get the 16-bit value from the offset
table with PEEK(start + 1 + 3 * 2) + PEEK(start + 2 + 3 * 2) * 256.
You get the number of vertices from PEEK(start + offset), and the number
of index pairs from PEEK(start + offset + 1). Finally, call the array-draw
table with `PEEK(start + 1 + 3 * 2) + PEEK(start + 2 + 3 * 2) * 256`.
You get the number of vertices from `PEEK(start + offset)`, and the number
of index pairs from `PEEK(start + offset + 1)`. Finally, call the array-draw
function with:
VA = start + offset + 2
IA = VA + num_vertices * 2
&PLOT va, ia, num_index_pairs
VA = start + offset + 2
IA = VA + num_vertices * 2
&PLOT va, ia, num_index_pairs
The 0,0 point in the blob is in the center of the phrase horizontally
(which allows a maximum width of 255 pixels), and at the font baseline