From 67cdcc2e12118becb823e20a40cc2687f2b8425a Mon Sep 17 00:00:00 2001
From: Adam Carpenter <53hornet@gmail.com>
Date: Wed, 27 Mar 2019 15:32:37 -0400
Subject: Started Rust in Action MEAP.

---
 meap/meap-code/ch2/ch2-sensor-emulator.rs | 36 +++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 meap/meap-code/ch2/ch2-sensor-emulator.rs

(limited to 'meap/meap-code/ch2/ch2-sensor-emulator.rs')

diff --git a/meap/meap-code/ch2/ch2-sensor-emulator.rs b/meap/meap-code/ch2/ch2-sensor-emulator.rs
new file mode 100644
index 0000000..afdc893
--- /dev/null
+++ b/meap/meap-code/ch2/ch2-sensor-emulator.rs
@@ -0,0 +1,36 @@
+use std::time;
+use std::f64::consts::PI;
+use std::thread;
+
+fn main() {
+    let mut sensor_array_state: f64 = 1.0;
+
+    for step in 1.. {
+        pause(step);
+        let reading = take_reading(sensor_array_state);
+        print_reading(reading);
+        sensor_array_state += 0.05;
+    }
+}
+
+fn pause(step: usize) {
+  let delay_ms = if step % 4 == 0 {
+      500
+  } else if step % 7 == 0 {
+      1000
+  } else {
+      3
+  };
+
+  let delay = time::Duration::from_millis(delay_ms);
+  thread::sleep(delay);
+}
+
+fn take_reading(x: f64) -> f64 {
+  // sin(x) + sin(π / sin(πx))
+  x.sin()   + (PI / (x*PI).sin()).sin()
+}
+
+fn print_reading(reading: f64) {
+  println!("{}", reading);
+}
-- 
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