pub fn default_chain_def() -> ChainDefExpand description
Initialize a chain definition with the default values. (b2DefaultChainDef)
Examples found in repository?
examples/benchmark/scenes/machines.rs (line 66)
39pub fn create_spinner(world: &mut World) {
40 let ground_id;
41 {
42 let body_def = default_body_def();
43 ground_id = create_body(world, &body_def);
44
45 let q = make_rot(-2.0 * PI / SPINNER_POINT_COUNT as f32);
46 let mut p = Vec2 { x: 40.0, y: 0.0 };
47 let mut points: Vec<Vec2> = Vec::with_capacity(SPINNER_POINT_COUNT);
48 for _ in 0..SPINNER_POINT_COUNT {
49 points.push(Vec2 {
50 x: p.x,
51 y: p.y + 32.0,
52 });
53 p = rotate_vector(q, p);
54 }
55
56 // C: b2SurfaceMaterial material = { 0 }; material.friction = 0.1f;
57 let material = SurfaceMaterial {
58 friction: 0.1,
59 restitution: 0.0,
60 rolling_resistance: 0.0,
61 tangent_speed: 0.0,
62 user_material_id: 0,
63 custom_color: 0,
64 };
65
66 let mut chain_def = default_chain_def();
67 chain_def.points = points;
68 chain_def.is_loop = true;
69 chain_def.materials = vec![material];
70
71 create_chain(world, ground_id, &chain_def);
72 }
73
74 {
75 let mut body_def = default_body_def();
76 body_def.type_ = BodyType::Dynamic;
77 body_def.position = to_pos(Vec2 { x: 0.0, y: 12.0 });
78 body_def.enable_sleep = false;
79
80 let spinner_id = create_body(world, &body_def);
81
82 let box_shape = make_rounded_box(0.4, 20.0, 0.2);
83 let mut shape_def = default_shape_def();
84 shape_def.material.friction = 0.0;
85 create_polygon_shape(world, spinner_id, &shape_def, &box_shape);
86
87 let motor_speed = 5.0;
88 let max_motor_torque = f32::MAX;
89 let mut joint_def = default_revolute_joint_def();
90 joint_def.base.body_id_a = ground_id;
91 joint_def.base.body_id_b = spinner_id;
92 joint_def.base.local_frame_a.p = body_get_local_point(world, ground_id, body_def.position);
93 joint_def.enable_motor = true;
94 joint_def.motor_speed = motor_speed;
95 joint_def.max_motor_torque = max_motor_torque;
96
97 let joint_id = create_revolute_joint(world, &joint_def);
98 SPINNER_ID.with(|id| id.set(joint_id));
99 }
100
101 let capsule = Capsule {
102 center1: Vec2 { x: -0.25, y: 0.0 },
103 center2: Vec2 { x: 0.25, y: 0.0 },
104 radius: 0.25,
105 };
106 let circle = Circle {
107 center: Vec2 { x: 0.0, y: 0.0 },
108 radius: 0.35,
109 };
110 let square = make_square(0.35);
111
112 let mut body_def = default_body_def();
113 body_def.type_ = BodyType::Dynamic;
114 let mut shape_def = default_shape_def();
115 shape_def.material.friction = 0.1;
116 shape_def.material.restitution = 0.1;
117 shape_def.density = 0.25;
118
119 let body_count: i32 = if BENCHMARK_DEBUG { 499 } else { 2 * 3038 };
120
121 let mut x = -23.0;
122 let mut y = 2.0;
123 for i in 0..body_count {
124 body_def.position = to_pos(Vec2 { x, y });
125 let body_id = create_body(world, &body_def);
126
127 let remainder = i % 3;
128 if remainder == 0 {
129 create_capsule_shape(world, body_id, &shape_def, &capsule);
130 } else if remainder == 1 {
131 create_circle_shape(world, body_id, &shape_def, &circle);
132 } else if remainder == 2 {
133 create_polygon_shape(world, body_id, &shape_def, &square);
134 }
135
136 x += 0.5;
137
138 if x >= 23.0 {
139 x = -23.0;
140 y += 0.5;
141 }
142 }
143}