eoc2: write up end of chapter 2 example.
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7786aa99a1
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128
rtchallenge/Cargo.lock
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128
rtchallenge/Cargo.lock
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@ -1,11 +1,60 @@
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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[[package]]
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name = "adler32"
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version = "1.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "byteorder"
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name = "cfg-if"
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[[package]]
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name = "crc32fast"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "81156fece84ab6a9f2afdb109ce3ae577e42b1228441eded99bd77f627953b1a"
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dependencies = [
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"cfg-if",
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]
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[[package]]
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name = "deflate"
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version = "0.8.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "73770f8e1fe7d64df17ca66ad28994a0a623ea497fa69486e14984e715c5d174"
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dependencies = [
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"adler32",
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"byteorder",
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]
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[[package]]
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name = "float-cmp"
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version = "0.8.0"
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@ -15,6 +64,15 @@ dependencies = [
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"num-traits",
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]
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[[package]]
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name = "miniz_oxide"
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version = "0.3.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "791daaae1ed6889560f8c4359194f56648355540573244a5448a83ba1ecc7435"
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dependencies = [
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"adler32",
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]
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[[package]]
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name = "num-traits"
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version = "0.2.14"
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@ -24,9 +82,79 @@ dependencies = [
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"autocfg",
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]
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[[package]]
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name = "png"
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version = "0.16.8"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3c3287920cb847dee3de33d301c463fba14dda99db24214ddf93f83d3021f4c6"
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dependencies = [
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"bitflags",
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"crc32fast",
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"deflate",
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"miniz_oxide",
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]
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[[package]]
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name = "proc-macro2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f0d8caf72986c1a598726adc988bb5984792ef84f5ee5aa50209145ee8077038"
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dependencies = [
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"unicode-xid",
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]
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[[package]]
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name = "quote"
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version = "1.0.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "rtchallenge"
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version = "0.1.0"
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dependencies = [
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"anyhow",
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"float-cmp",
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"png",
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"thiserror",
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]
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[[package]]
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name = "syn"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "thiserror"
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version = "1.0.25"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "fa6f76457f59514c7eeb4e59d891395fab0b2fd1d40723ae737d64153392e9c6"
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dependencies = [
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"thiserror-impl",
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]
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[[package]]
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name = "thiserror-impl"
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version = "1.0.25"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8a36768c0fbf1bb15eca10defa29526bda730a2376c2ab4393ccfa16fb1a318d"
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dependencies = [
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"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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name = "unicode-xid"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
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@ -7,4 +7,7 @@ edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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anyhow = "1.0.41"
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float-cmp = "0.8.0"
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png = "0.16.8"
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thiserror = "1.0.25"
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71
rtchallenge/examples/eoc2.rs
Normal file
71
rtchallenge/examples/eoc2.rs
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@ -0,0 +1,71 @@
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use anyhow::{bail, Result};
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use rtchallenge::{
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canvas::{canvas, Canvas},
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tuples::{color, point, vector, Tuple},
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};
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#[derive(Debug)]
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struct Environment {
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gravity: Tuple,
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wind: Tuple,
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}
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#[derive(Debug)]
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struct Projectile {
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position: Tuple,
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velocity: Tuple,
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}
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fn tick(env: &Environment, proj: &Projectile) -> Projectile {
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let position = proj.position + proj.velocity;
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let velocity = proj.velocity + env.gravity + env.wind;
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Projectile { position, velocity }
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}
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fn draw_dot(c: &mut Canvas, x: usize, y: usize) {
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let red = color(1., 0., 0.);
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c.set(x.saturating_sub(1), y.saturating_sub(1), red);
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c.set(x, y.saturating_sub(1), red);
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c.set(x + 1, y.saturating_sub(1), red);
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c.set(x.saturating_sub(1), y, red);
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c.set(x, y, red);
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c.set(x + 1, y, red);
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c.set(x.saturating_sub(1), y + 1, red);
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c.set(x, y + 1, red);
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c.set(x + 1, y + 1, red);
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}
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fn main() -> Result<()> {
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let mut p = Projectile {
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position: point(0., 1., 0.),
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velocity: 10. * vector(1., 2., 0.).normalize(),
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};
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let e = Environment {
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gravity: vector(0., -0.1, 0.),
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wind: vector(-0.01, 0., 0.),
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};
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let w = 800;
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let h = 600;
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let mut c = canvas(w, h);
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let mut i = 0;
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let w = w as f32;
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let h = h as f32;
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while p.position.y > 0. {
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p = tick(&e, &p);
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println!("tick {}: proj {:?}", i, p);
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let x = p.position.x;
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let y = p.position.y;
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if x > 0. && x < w && y > 0. && y < h {
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let x = x as usize;
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let y = (h - y) as usize;
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draw_dot(&mut c, x, y)
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}
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i += 1;
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if i > 1000 {
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bail!("too many iterations");
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}
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}
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c.write_to_file("/tmp/output.png")?;
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Ok(())
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}
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