xref: /freebsd/share/examples/bootforth/frames.4th (revision 3416500aef140042c64bc149cb1ec6620483bc44)
1\ Words implementing frame drawing
2\ XXX Filled boxes are left as an exercise for the reader... ;-/
3\ $FreeBSD$
4
5marker task-frames.4th
6
7variable h_el
8variable v_el
9variable lt_el
10variable lb_el
11variable rt_el
12variable rb_el
13variable fill
14
15\ Single frames
16196 constant sh_el
17179 constant sv_el
18218 constant slt_el
19192 constant slb_el
20191 constant srt_el
21217 constant srb_el
22\ Double frames
23205 constant dh_el
24186 constant dv_el
25201 constant dlt_el
26200 constant dlb_el
27187 constant drt_el
28188 constant drb_el
29\ Fillings
300 constant fill_none
3132 constant fill_blank
32176 constant fill_dark
33177 constant fill_med
34178 constant fill_bright
35
36: hline	( len x y -- )	\ Draw horizontal single line
37	at-xy		\ move cursor
38	0 do
39		h_el @ emit
40	loop
41;
42
43: f_single	( -- )	\ set frames to single
44	sh_el h_el !
45	sv_el v_el !
46	slt_el lt_el !
47	slb_el lb_el !
48	srt_el rt_el !
49	srb_el rb_el !
50;
51
52: f_double	( -- )	\ set frames to double
53	dh_el h_el !
54	dv_el v_el !
55	dlt_el lt_el !
56	dlb_el lb_el !
57	drt_el rt_el !
58	drb_el rb_el !
59;
60
61: vline	( len x y -- )	\ Draw vertical single line
62	2dup 4 pick
63	0 do
64		at-xy
65		v_el @ emit
66		1+
67		2dup
68	loop
69	2drop 2drop drop
70;
71
72: box	( w h x y -- )	\ Draw a box
73	2dup 1+ 4 pick 1- -rot
74	vline		\ Draw left vert line
75	2dup 1+ swap 5 pick + swap 4 pick 1- -rot
76	vline		\ Draw right vert line
77	2dup swap 1+ swap 5 pick 1- -rot
78	hline		\ Draw top horiz line
79	2dup swap 1+ swap 4 pick + 5 pick 1- -rot
80	hline		\ Draw bottom horiz line
81	2dup at-xy lt_el @ emit	\ Draw left-top corner
82	2dup 4 pick + at-xy lb_el @ emit	\ Draw left bottom corner
83	2dup swap 5 pick + swap at-xy rt_el @ emit	\ Draw right top corner
84	2 pick + swap 3 pick + swap at-xy rb_el @ emit
85	2drop
86;
87
88f_single
89fill_none fill !
90