1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
open StdLabels
module Path = Brr_canvas.C2d.Path
module Point = Point
module Builder = Builder
(** Translate the point in the canva area *)
let translate_point
: area:Gg.v2 -> Gg.v2 -> (float * float)
= fun ~area point ->
let x, y = Gg.V2.(to_tuple @@ mul area point) in
x, ((Gg.V2.y area) -. y)
let translate_point'
: area:Gg.v2 -> Gg.v2 -> Gg.v2 -> (float * float)
= fun ~area vect point ->
let open Gg.V2 in
translate_point ~area
(point + vect)
(* Draw a straight line between two points *)
let line
: Gg.v2 -> p1:Point.t -> Path.t -> unit
= fun area ~p1 path ->
let x, y = translate_point ~area (Point.get_coord p1) in
Path.line_to path ~x ~y
(* Draw a simple bezier curve from the three given points *)
let three_points
: Gg.v2 -> p0:Point.t -> p1:Point.t -> p2:Point.t -> Path.t -> unit
= fun area ~p0 ~p1 ~p2 path ->
let p0 = Point.get_coord p0
and p1 = Point.get_coord p1
and p2 = Point.get_coord p2 in
let bezier = Shapes.Bezier.three_points_quadratic p0 p1 p2
|> Shapes.Bezier.quadratic_to_cubic in
let cx, cy = translate_point ~area bezier.Shapes.Bezier.ctrl0
and cx', cy' = translate_point ~area bezier.Shapes.Bezier.ctrl1
and x, y = translate_point ~area bezier.Shapes.Bezier.p1 in
Path.ccurve_to path
~cx ~cy
~cx' ~cy'
~x ~y
let multi_points
: ?connexion:Gg.v2 -> Gg.v2 -> Point.t list -> Path.t -> unit
= fun ?connexion area points path ->
let (let*) v f =
match v with
| Ok beziers -> f beziers
| _ -> () in
let points = List.map ~f:Point.get_coord points in
let* beziers = Shapes.Bspline.to_bezier ?connexion1:connexion points in
Array.iter beziers
~f:(fun bezier ->
let cx, cy = translate_point ~area bezier.Shapes.Bezier.ctrl0
and cx', cy' = translate_point ~area bezier.Shapes.Bezier.ctrl1
and x, y = translate_point ~area bezier.Shapes.Bezier.p1 in
Path.ccurve_to path
~cx ~cy
~cx' ~cy'
~x ~y
)
let circle
: Gg.v2 -> center:Gg.v2 -> float -> Path.t -> Path.t
= fun area ~center r path ->
let cx, cy = translate_point ~area center in
Path.arc
path
~cx ~cy
~r
~start:0.
~stop:Gg.Float.two_pi;
path
type path =
| Empty
| Line of Point.t * Point.t
| Three_point of Point.t * Point.t * Point.t
| Curve of Shapes.Bezier.t array
type t =
{ id : int
; path : path }
let move_to
: area:Gg.v2 -> Brr_canvas.C2d.Path.t -> path -> unit
= fun ~area canvaPath path ->
match path with
| Empty -> ()
| Line (p0, _)
| Three_point (p0, _, _) ->
let x, y = translate_point ~area (Point.get_coord p0) in
Path.move_to canvaPath ~x ~y
| Curve beziers ->
try
let bezier = Array.get beziers 0 in
let x, y = translate_point ~area bezier.Shapes.Bezier.p0 in
Path.move_to canvaPath ~x ~y
with _ -> ()
let draw
: ?connexion:Point.t -> area:Gg.v2 -> Brr_canvas.C2d.Path.t -> path -> unit
= fun ?connexion ~area canvaPath path ->
match connexion, path with
| _, Empty -> ()
| None, Line (_, p1) ->
ignore @@ line area ~p1 canvaPath
| Some p0, Line (p1, p2)
| None, Three_point (p0, p1, p2)
| Some _, Three_point (p0, p1, p2) ->
ignore @@ three_points area ~p0 ~p1 ~p2 canvaPath
| _, Curve beziers ->
Array.iter beziers
~f:(fun bezier ->
let cx, cy = translate_point ~area bezier.Shapes.Bezier.ctrl0
and cx', cy' = translate_point ~area bezier.Shapes.Bezier.ctrl1
and x, y = translate_point ~area bezier.Shapes.Bezier.p1 in
Path.ccurve_to canvaPath
~cx ~cy
~cx' ~cy'
~x ~y
)
let go_back
: ?connexion:Point.t -> area:Gg.v2 -> Brr_canvas.C2d.Path.t -> path -> unit
= fun ?connexion ~area canvaPath path ->
let vect = Gg.V2.of_polar @@ Gg.V2.v
0.01
Gg.Float.pi_div_4
in
match connexion, path with
| _, Empty -> ()
| _, Three_point (p0, p1, p2) ->
let open Point in
let p0' = p0 + vect
and p1' = p1 + vect
and p2' = p2 + vect in
let x, y = translate_point' ~area vect @@ Point.get_coord p2 in
Path.line_to canvaPath ~x ~y;
ignore @@ three_points area ~p0:p2' ~p1:p1' ~p2:p0' canvaPath
| _, Curve beziers ->
let last = Array.get beziers ((Array.length beziers) -1) in
let x, y =
last.Shapes.Bezier.p1
|> translate_point' vect ~area in
Path.line_to canvaPath ~x ~y;
for i = 1 to Array.length beziers do
let i = (Array.length beziers) - i in
let bezier = Array.get beziers i in
let cx, cy = translate_point' vect ~area bezier.Shapes.Bezier.ctrl1
and cx', cy' = translate_point' vect ~area bezier.Shapes.Bezier.ctrl0
and x, y = translate_point' vect ~area bezier.Shapes.Bezier.p0 in
Path.ccurve_to canvaPath
~cx ~cy
~cx' ~cy'
~x ~y
done;
| _ -> ()
type quick_path = Point.t list * Shapes.Bezier.t list
let id = ref 0
let to_path
: quick_path -> t
= fun (points, beziers) ->
incr id;
let id = !id in
match beziers with
| [] ->
begin match points with
| p0::p1::[] -> {id; path=Line (p0, p1)}
| p0::p1::p2::[] -> {id; path=Three_point (p0, p1, p2)}
| points ->
let (let*) v f =
match v with
| Ok beziers -> f beziers
| _ -> {id; path=Empty} in
let points' = List.map ~f:Point.get_coord points in
let* beziers = Shapes.Bspline.to_bezier points' in
{id; path=Curve beziers}
end
| _ ->
let (let*) v f =
match v with
| Ok beziers -> f beziers
| _ -> {id; path=Curve (Array.of_list beziers)} in
let connexion = match beziers with
| hd::_ -> Some hd.Shapes.Bezier.p1
| _ -> None in
let* beziers' = Shapes.Bspline.to_bezier
?connexion1:connexion
(List.map points ~f:Point.get_coord) in
(* Create a new array with both lenght *)
let t = Array.append
beziers'
(Array.of_list beziers)
in
{id; path = Curve t}
|
