From c4ef9046d4af0ea09c0d28d513a76ed16e543a9b Mon Sep 17 00:00:00 2001
From: Augusto <aug.ornelas@gmail.com>
Date: Sat, 26 Dec 2020 22:46:07 +0000
Subject: [PATCH] Add subject and test for the exercise `circle`

---
 rust/tests/circle_test/Cargo.lock  | 426 +++++++++++++++++++++++++++++
 rust/tests/circle_test/Cargo.toml  |  10 +
 rust/tests/circle_test/src/main.rs |  70 +++++
 subjects/circle/README.md          |  95 +++++++
 4 files changed, 601 insertions(+)
 create mode 100644 rust/tests/circle_test/Cargo.lock
 create mode 100644 rust/tests/circle_test/Cargo.toml
 create mode 100644 rust/tests/circle_test/src/main.rs
 create mode 100644 subjects/circle/README.md

diff --git a/rust/tests/circle_test/Cargo.lock b/rust/tests/circle_test/Cargo.lock
new file mode 100644
index 00000000..72a8b713
--- /dev/null
+++ b/rust/tests/circle_test/Cargo.lock
@@ -0,0 +1,426 @@
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diff --git a/rust/tests/circle_test/Cargo.toml b/rust/tests/circle_test/Cargo.toml
new file mode 100644
index 00000000..a648751e
--- /dev/null
+++ b/rust/tests/circle_test/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "circle_test"
+version = "0.1.0"
+authors = ["Augusto <aug.ornelas@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+circle = { path = "../../../../rust-piscine-solutions/circle"}
\ No newline at end of file
diff --git a/rust/tests/circle_test/src/main.rs b/rust/tests/circle_test/src/main.rs
new file mode 100644
index 00000000..e05821ba
--- /dev/null
+++ b/rust/tests/circle_test/src/main.rs
@@ -0,0 +1,70 @@
+//use raster::{Color, Image};
+use circle::{Circle, Point};
+// Create a structure that represents a circle
+// using the radius and the center point
+
+fn main() {
+	let circle = Circle::new(500.0, 500.0, 150.0);
+	let circle1 = Circle {
+		center: Point { x: 80.0, y: 115.0 },
+		radius: 30.0,
+	};
+	let point_a = Point { x: 1.0, y: 1.0 };
+	let point_b = Point { x: 0.0, y: 0.0 };
+	println!("circle = {:?} area = {}", circle, circle.area());
+	println!("circle = {:?} diameter = {}", circle, circle.diameter());
+	println!("circle1 = {:?} diameter = {}", circle1, circle1.diameter());
+	println!(
+		"circle and circle1 intersect = {}",
+		circle.intersect(&circle1)
+	);
+
+	println!(
+		"distance between {:?} and {:?} is {}",
+		point_a,
+		point_b,
+		point_a.distance(&point_b)
+	);
+}
+
+#[allow(dead_code)]
+fn approx_eq(a: f64, b: f64) -> bool {
+	(a - b).abs() < f64::EPSILON
+}
+
+#[test]
+fn test_new_circle() {
+	let circle = Circle::new(500.0, 400.0, 150.0);
+	assert!(approx_eq(circle.radius, 150.0));
+	assert!(approx_eq(circle.center.x, 500.0));
+	assert!(approx_eq(circle.center.y, 400.0));
+}
+
+#[test]
+fn test_distance() {
+	let a = Point { x: 0.0, y: 1.0 };
+	let b = Point { x: 0.0, y: 0.0 };
+	assert!(approx_eq(a.distance(&b), 1.0));
+	let a = Point { x: 1.0, y: 0.0 };
+	let b = Point { x: 0.0, y: 0.0 };
+	assert!(approx_eq(a.distance(&b), 1.0));
+	let a = Point { x: 1.0, y: 1.0 };
+	let b = Point { x: 0.0, y: 0.0 };
+	assert!(approx_eq(a.distance(&b), f64::sqrt(2.0)));
+}
+
+#[test]
+fn test_area() {
+	let circle = Circle::new(500.0, 400.0, 150.0);
+	assert!(approx_eq(circle.area(), 70685.83470577035));
+}
+
+#[test]
+fn test_intersection() {
+	let circle = Circle::new(500.0, 500.0, 150.0);
+	let circle1 = Circle::new(80.0, 115.0, 30.0);
+	assert!(!circle.intersect(&circle1));
+	let circle = Circle::new(100.0, 300.0, 150.0);
+	let circle1 = Circle::new(80.0, 115.0, 100.0);
+	assert!(circle.intersect(&circle1));
+}
diff --git a/subjects/circle/README.md b/subjects/circle/README.md
new file mode 100644
index 00000000..df8247e1
--- /dev/null
+++ b/subjects/circle/README.md
@@ -0,0 +1,95 @@
+## circle
+
+### Instructions
+
+Create the structures `Circle` and `Point` and the methods necessary for the code in [usage](#usage) to compile and run giving the expected result.
+
+Methods:
+  - Point;
+    distance()
+  - Circle:
+    diameter -> returns the diameter of the circle
+    area -> returns the area of the circle
+    intersection -> returns true if the 2 circles intersect
+Associated Functions
+  - Circle:
+    new -> receives three 64 bits floating point numbers in the following
+    order: x, y and radius (x and y are the coordinates of the center).
+    and returns a new circle
+	
+	
+### Expected Functions and Structures
+
+This snippets are incomplete and it's part of the exercise to discover the how to complete them
+
+```rust
+struct Circle {
+	center //..
+	radius //..
+}
+
+struct Point {
+// ...	
+}
+
+// Point
+fn distance(p1, p2) -> _ {
+
+}
+
+// Circle
+fn new(x: f64, y: f64, radius: f64) -> Circle {
+}
+
+fn diameter(_) -> _ {
+}
+
+fn area() -> _ {
+}
+```
+
+### Usage
+
+Here is a program to test your function
+
+```rust
+use std::f64::consts;
+use circle::{Circle, Point};
+
+fn main() {
+	let circle = Circle::new(500.0, 500.0, 150.0);
+	let circle1 = Circle {
+		center: Point { x: 80.0, y: 115.0 },
+		radius: 30.0,
+	};
+	let point_a = Point { x: 1.0, y: 1.0 };
+	let point_b = Point { x: 0.0, y: 0.0 };
+	println!("circle = {:?} area = {}", circle, circle.area());
+	println!("circle = {:?} diameter = {}", circle, circle.diameter());
+	println!("circle1 = {:?} diameter = {}", circle1, circle1.diameter());
+	println!(
+		"circle and circle1 intersect = {}",
+		circle.intersect(&circle1)
+	);
+
+	println!(
+		"distance between {:?} and {:?} is {}",
+		point_a,
+		point_b,
+		point_a.distance(&point_b)
+	);
+
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+circle = Circle { center: Point { x: 500.0, y: 500.0 }, radius: 150.0 } area = 70685.83470577035
+circle = Circle { center: Point { x: 500.0, y: 500.0 }, radius: 150.0 } diameter = 300
+circle1 = Circle { center: Point { x: 80.0, y: 115.0 }, radius: 30.0 } diameter = 60
+circle and circle1 intersect = false
+distance between Point { x: 1.0, y: 1.0 } and Point { x: 0.0, y: 0.0 } is 1.4142135623730951
+student@ubuntu:~/[[ROOT]]/test$
+```