2D-physics-engine/Body.m at main · josewal/2D-physics-engine · GitHub

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
classdef Body < handle
    properties
        com = [0,0];
        particles
        bonds
        boundries
        mass = 0;
    end

    methods
        function obj = Body(shape)
            obj.particles = shape.particles;
            obj.bonds = shape.bonds;
            obj.boundries = shape.boundries;

            for i = 1:size(obj.particles,1)
                for j = 1:size(obj.particles,2)
                    obj.mass = obj.mass + obj.particles(i,j).mass;
                end
            end

            obj.calcCOM();

        end

        function moveBody(obj, toWhere)
            move = toWhere - obj.com;
            for i = 1:size(obj.particles,1)
                for j = 1:size(obj.particles,2)
                    obj.particles(i,j).loc = obj.particles(i,j).loc + move;
                end
            end
        end

        function applyForce(obj, force)
            for i = 1:size(obj.particles,1)
                for j = 1:size(obj.particles,2)
                    obj.particles(i,j).applyForce(force)
                end
            end
        end

        function updateParticles(obj, dt)
            for i = 1:size(obj.particles,1)
                for j = 1:size(obj.particles,2)
                    obj.particles(i,j).update(dt)
                end
            end
        end

        function applyBonds(obj)
            for i = 1:size(obj.bonds,1)
                for j = 1:size(obj.bonds,2)
                    obj.bonds(i,j).applyBond()
                end
            end
        end

        function update(obj,dt)
            obj.applyBonds();
            obj.calcCOM();
            obj.updateParticles(dt);
        end

        function calcCOM(obj)
            a = 0;
            for i = 1:size(obj.particles,1)
                for j = 1:size(obj.particles,2)
                    a = a + obj.particles(i,j).mass * obj.particles(i,j).loc;
                end
            end
            obj.com = a/obj.mass;
        end

        function plotBody(obj)
            for i = 1:size(obj.particles, 1)
                for j = 1:size(obj.particles, 2)
                    obj.particles(i,j).plotParticle()
                    hold on
                end
            end
            hold off
        end

        function plotBonds(obj)
            for i = 1:length(obj.bonds)
                obj.bonds(i).plotBond();
                hold on
            end
            hold off
        end

        function plotCOM(obj)
            plot(obj.com(1), obj.com(2), "go")
        end

%         function X = record(obj)
%             X = obj.com;
%             for i = 1:size(obj.boundries, 2)
%                 side = [obj.particles(obj.boundries(i,1).loc),...
%                         ...obj.particles(obj.boundries(i,2).loc)
%                 X = [X;side];
%             end
%         end
    end
end