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244 | -----------------------------------------------------------------------
-- 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;
with Float_Maths; use Float_Maths;
procedure Subprograms_Main is
-- define type Bodies_Enum_T and Rotating_Bodies_T
type Bodies_Enum_T is (Sun, Earth, Moon, Satellite, Comet);
subtype Rotating_Bodies_T is Bodies_Enum_T
range Earth .. Bodies_Enum_T'Last;
-- 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 as an array of Body_Type indexed by
-- bodies enumeration
type Bodies_Array_T is array (Bodies_Enum_T) of Body_T;
-- 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;
-- 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
--$ line question
return 0.0;
--$ line answer
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;
--$ begin answer
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;
--$ end answer
-- move a given body over one time step
procedure Move
(Bodies : in out Bodies_Array_T; Body_To_Move_Index : Bodies_Enum_T);
--$ begin answer
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;
--$ end answer
--$ begin question
-- procedure Draw_Body takes 2 parameters of your choice:
-- it needs something to draw, and something to draw it on
--$ end question
--$ begin answer
procedure Draw_Body (Object : Body_T; Canvas : Canvas_ID);
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 answer
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);
Bodies :=
(Sun =>
(Distance => 0.0,
Speed => 0.0,
Radius => 20.0,
X => 0.0,
Y => 0.0,
Angle => 0.0,
Color => Yellow,
Turns_Around => Sun),
Earth =>
(Distance => 50.0,
Speed => 0.02,
Radius => 5.0,
X => 0.0,
Y => 0.0,
Angle => 0.0,
Color => Blue,
Turns_Around => Sun),
Moon =>
(Distance => 15.0,
Speed => 0.04,
Radius => 2.0,
X => 0.0,
Y => 0.0,
Angle => 0.0,
Color => White,
Turns_Around => Earth),
Satellite =>
(Distance => 8.0,
Speed => 0.1,
Radius => 1.0,
X => 0.0,
Y => 0.0,
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,
Color => Yellow,
Turns_Around => Sun));
-- initialize the Next step time as the current time (Clock) + the period
Next := Clock + Period;
while not Is_Killed loop
--$ begin question
-- update each body position and angles
-- the position of an object around (0,0) at distance d with an
-- angle a is (d*cos(a), d*sin(a))
-- update angle parameter of each body adding speed to the previous
-- angle
for B in Rotating_Bodies_T loop
Bodies (B).X := Bodies (Bodies (B).Turns_Around).X
+ Bodies (B).Distance
* Cos (Bodies (B).Angle);
Bodies (B).Y := Bodies (Bodies (B).Turns_Around).Y
+ Bodies (B).Distance
* Sin (Bodies (B).Angle);
Bodies (B).Angle := Bodies (B).Angle +
Bodies (B).Speed;
end loop;
-- create a loop to draw every objects
-- use the Draw_Sphere procedure to do it
for B in Bodies_Enum_T loop
Draw_Sphere (Canvas => Canvas,
Position => (Bodies (B).X, Bodies (B).Y, 0.0),
Radius => Bodies (B).Radius,
Color => Bodies (B).Color);
end loop;
--$ end question
--$ begin answer
for B in Rotating_Bodies_T loop
-- call the move procedure for each body
Move (Bodies, B);
end loop;
for B in Bodies_Enum_T loop
-- draw each body
Draw_Body (Bodies (B), Canvas);
end loop;
--$ end answer
Handle_Events (Window);
-- wait until Now + Period time elapsed before the next
delay until Next;
Next := Next + Period;
end loop;
end Subprograms_Main;
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