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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248 | -----------------------------------------------------------------------
-- Ada Labs --
-- --
-- Copyright (C) 2008-2023, AdaCore --
-- --
-- This program is free software: you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation, either version 3 of --
-- the License, or (at your option) any later version. --
-- --
-- This program is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the --
-- GNU General Public License for more details. --
-- --
-- You should have received a copy of the GNU General Public License --
-- along with this program. If not, see --
-- <https://www.gnu.org/licenses/>. --
-----------------------------------------------------------------------
with Ada.Real_Time; use Ada.Real_Time;
with Mage; use Mage;
with Mage.Draw; use Mage.Draw;
with Mage.Event; use Mage.Event;
--$ line question
with Float_Maths; use Float_Maths;
--$ begin answer
with Solar_System; use Solar_System;
with Solar_System.Graphics; use Solar_System.Graphics;
--$ end answer
procedure Packages_Main is
--$ begin question
-- define type Bodies_Enum_T as an enumeration of Sun, Earth, Moon,
-- and Satellite
type Bodies_Enum_T is (Sun, Earth, Moon, Satellite, Comet);
-- define a type Body_T to store every information about a body
-- X, Y, Distance, Speed, Angle, Color, Radius
type Body_T is record
X : Float := 0.0;
Y : Float := 0.0;
Distance : Float;
Speed : Float;
Angle : Float;
Color : RGBA_T;
Radius : Float;
Turns_Around : Bodies_Enum_T;
end record;
-- define type Bodies_Array_T as an array of Body_T indexed by bodies
-- enumeration
type Bodies_Array_T is array (Bodies_Enum_T) of Body_T;
--$ end question
-- declare variable Bodies which is an array of Body_Type
Bodies : Bodies_Array_T;
-- declare a variable Next of type Time to store the Next step time
Next : Time;
-- declare a constant Period of 40 milliseconds of type Time_Span defining
-- the loop period
Period : constant Time_Span := Milliseconds (40);
-- reference to the application window
Window : Window_ID;
-- reference to the graphical canvas associated with the application window
Canvas : Canvas_ID;
--$ begin question
-- implement a function to compute the X coordinate
-- x of the reference + distance * cos(angle)
function Compute_X
(Body_To_Move : Body_T; Turns_Around : Body_T) return Float;
function Compute_X
(Body_To_Move : Body_T; Turns_Around : Body_T) return Float
is
begin
return Turns_Around.X + Body_To_Move.Distance * Cos (Body_To_Move.Angle);
end Compute_X;
-- implement a function to compute the Y coordinate
-- y of the reference + distance * sin(angle)
function Compute_Y
(Body_To_Move : Body_T; Turns_Around : Body_T) return Float;
function Compute_Y
(Body_To_Move : Body_T; Turns_Around : Body_T) return Float
is
begin
return Turns_Around.Y + Body_To_Move.Distance * Sin (Body_To_Move.Angle);
end Compute_Y;
procedure Move
(Bodies : in out Bodies_Array_T; Body_To_Move_Index : Bodies_Enum_T);
procedure Move
(Bodies : in out Bodies_Array_T; Body_To_Move_Index : Bodies_Enum_T) is
Body_To_Move : Body_T renames Bodies (Body_To_Move_Index);
Turns_Around : constant Body_T := Bodies (Body_To_Move.Turns_Around);
begin
Body_To_Move.X :=
Compute_X (Body_To_Move, Turns_Around);
Body_To_Move.Y :=
Compute_Y (Body_To_Move, Turns_Around);
Body_To_Move.Angle := Body_To_Move.Angle + Body_To_Move.Speed;
end Move;
procedure Draw_Body (Object : Body_T; Canvas : Canvas_ID) is
begin
Draw_Sphere
(Canvas => Canvas, Position => (Object.X, Object.Y, 0.0),
Radius => Object.Radius, Color => Object.Color);
end Draw_Body;
--$ end question
begin
-- Create the main window
Window :=
Create_Window (Width => 240, Height => 320, Name => "Solar System");
-- retrieve the graphical canvas associated with the main window
Canvas := Get_Canvas (Window);
-- initialize Bodies variable with parameters for each body using an
-- aggregate
Bodies :=
(Sun =>
(Distance => 0.0,
Speed => 0.0,
Radius => 20.0,
X => 0.0,
Y => 0.0,
--$ line answer
Visible => True,
Angle => 0.0,
Color => Yellow,
Turns_Around => Sun),
Earth =>
(Distance => 50.0,
Speed => 0.02,
Radius => 5.0,
X => 0.0,
Y => 0.0,
--$ line answer
Visible => True,
Angle => 0.0,
Color => Blue,
Turns_Around => Sun),
Moon =>
(Distance => 15.0,
Speed => 0.04,
Radius => 2.0,
X => 0.0,
Y => 0.0,
--$ line answer
Visible => True,
Angle => 0.0,
Color => White,
Turns_Around => Earth),
Satellite =>
(Distance => 8.0,
Speed => 0.1,
Radius => 1.0,
X => 0.0,
Y => 0.0,
--$ line answer
Visible => True,
Angle => 0.0,
Color => Red,
Turns_Around => Earth),
Comet =>
(Distance => 80.0,
Angle => 0.0,
Speed => 0.05,
Radius => 1.0,
X => 0.0,
Y => 0.0,
--$ line answer
Visible => True,
Color => Yellow,
--$ line question
Turns_Around => Sun));
--$ begin answer
Turns_Around => Sun),
Black_Hole =>
(Distance => 75.0,
Angle => 0.0,
Speed => 0.02,
Turns_Around => Sun,
Visible => False,
others => <>),
Asteroid_1 =>
(Distance => 5.0,
Angle => 0.0,
Speed => 0.1,
Radius => 1.0,
Color => Green,
X => 0.0,
Y => 0.0,
Visible => True,
Turns_Around => Black_Hole),
Asteroid_2 =>
(Distance => 5.0,
Angle => 3.14,
Speed => 0.1,
Radius => 1.0,
Color => Cyan,
X => 0.0,
Y => 0.0,
Visible => True,
Turns_Around => Black_Hole));
--$ end answer
-- initialize the Next step time at the current time (Clock) + period
Next := Clock + Period;
while not Is_Killed loop
--$ begin question
for B in Bodies_Enum_T loop
-- call the move procedure for each body
Move (Bodies, B);
Draw_Body (Bodies (B), Canvas);
end loop;
--$ end question
--$ begin answer
Move_All (Bodies);
Draw_All (Bodies, Canvas);
--$ end answer
Handle_Events (Window);
delay until Next;
Next := Next + Period;
end loop;
end Packages_Main;
|