tree/
tree.rs

1use miniquad::*;
2use quad_gl::*;
3
4struct Stage {
5    gl: QuadGl,
6}
7
8fn rect(gl: &mut QuadGl, w: f32, h: f32) {
9    gl.geometry(
10        &[
11            Vertex::new(-w / 2., h, 0., 0., 0., RED),
12            Vertex::new(w / 2., h, 0., 0., 0., RED),
13            Vertex::new(-w / 2., 0., 0., 0., 0., RED),
14            Vertex::new(w / 2., 0., 0., 0., 0., RED),
15        ],
16        &[0, 1, 2, 1, 2, 3],
17    );
18}
19
20fn tree(gl: &mut QuadGl, time: f64, deep: u32, angle: f32, tall: f32) {
21    if deep >= 8 {
22        return;
23    }
24
25    // root
26    rect(gl, 0.01, tall);
27
28    gl.push_model_matrix(glam::Mat4::from_translation(glam::vec3(0., tall, 0.)));
29
30    // right leaf
31    gl.push_model_matrix(glam::Mat4::from_rotation_z(angle + time.sin() as f32 * 0.1));
32    tree(gl, time, deep + 1, angle * 0.7, tall * 0.8);
33    gl.pop_model_matrix();
34
35    // left leaf
36    gl.push_model_matrix(glam::Mat4::from_rotation_z(
37        -angle - time.cos() as f32 * 0.1,
38    ));
39    tree(gl, time, deep + 1, angle * 0.7, tall * 0.8);
40    gl.pop_model_matrix();
41
42    gl.pop_model_matrix();
43}
44impl EventHandler for Stage {
45    fn update(&mut self, _ctx: &mut Context) {}
46
47    fn draw(&mut self, ctx: &mut Context) {
48        ctx.clear(Some((0., 1., 0., 1.)), None, None);
49
50        self.gl
51            .push_model_matrix(glam::Mat4::from_translation(glam::vec3(0., -0.5, 0.)));
52        tree(&mut self.gl, miniquad::date::now(), 0, 1., 0.3);
53        self.gl.pop_model_matrix();
54
55        self.gl.draw(ctx);
56    }
57}
58
59fn main() {
60    miniquad::start(conf::Conf::default(), |mut ctx| {
61        UserData::owning(
62            Stage {
63                gl: QuadGl::new(&mut ctx),
64            },
65            ctx,
66        )
67    });
68}
tree/tree.rs

tree/
tree.rs
