2019-12-30 17:51:06 +00:00
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use std::ops::Add;
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#[derive(Debug, Copy, Clone)]
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pub struct Point {
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x: u32,
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y: u32,
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}
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2019-12-31 00:31:18 +00:00
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#[derive(Debug, Copy, Clone, Eq, PartialEq)]
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2019-12-30 17:51:06 +00:00
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pub struct Rectangle {
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2019-12-31 00:23:21 +00:00
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top_left: Point,
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2019-12-30 17:51:06 +00:00
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width: u32,
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height: u32,
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}
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impl Point {
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pub fn new(x: u32, y: u32) -> Self {
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Self { x, y }
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}
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pub fn origin() -> Self {
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Self { x: 0, y: 0 }
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}
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2019-12-31 00:08:58 +00:00
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pub fn with_x(&self, x: u32) -> Self {
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Self { x, y: self.y }
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2019-12-30 17:51:06 +00:00
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}
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2019-12-31 00:08:58 +00:00
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pub fn with_y(&self, y: u32) -> Self {
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Self { x: self.x, y }
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2019-12-30 17:51:06 +00:00
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}
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pub fn x(&self) -> u32 {
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self.x
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}
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pub fn y(&self) -> u32 {
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self.y
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}
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pub fn left_of(&self, other: &Self) -> bool {
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self.x < other.x
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}
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pub fn right_of(&self, other: &Self) -> bool {
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self.x > other.x
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}
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pub fn above(&self, other: &Self) -> bool {
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self.y < other.y
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}
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pub fn below(&self, other: &Self) -> bool {
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self.y > other.y
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}
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}
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impl Add for Point {
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type Output = Point;
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fn add(self, other: Point) -> Point {
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Point {
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x: self.x + other.x,
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y: self.y + other.y,
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}
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}
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}
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2019-12-31 00:11:11 +00:00
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// These can be derived too, but implement them for demonstration.
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2019-12-30 17:51:06 +00:00
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impl PartialEq for Point {
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fn eq(&self, other: &Self) -> bool {
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self.x == other.x && self.y == other.y
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}
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}
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impl Eq for Point {}
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2019-12-31 00:21:43 +00:00
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impl Rectangle {
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2019-12-31 00:23:21 +00:00
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fn from_corner_width_height(top_left: Point, width: u32, height: u32) -> Rectangle {
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Rectangle {
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top_left,
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width,
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height,
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}
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}
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fn from_corners(corner_a: Point, corner_b: Point) -> Rectangle {
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let left = corner_a.x().min(corner_b.x());
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let top = corner_a.y().min(corner_b.y());
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let width = (corner_a.x() as i64 - corner_b.x() as i64).abs() as u32;
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let height = (corner_a.y() as i64 - corner_b.y() as i64).abs() as u32;
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Rectangle {
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top_left: Point::new(left, top),
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width,
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height,
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}
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}
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fn at_origin_with_size(width: u32, height: u32) -> Rectangle {
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Rectangle {
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top_left: Point::origin(),
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2019-12-31 00:21:43 +00:00
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width,
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height,
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}
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}
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fn width(&self) -> u32 {
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self.width
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}
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fn height(&self) -> u32 {
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self.height
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}
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fn with_width(&self, width: u32) -> Rectangle {
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Rectangle {
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2019-12-31 00:23:21 +00:00
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top_left: self.top_left,
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2019-12-31 00:21:43 +00:00
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width,
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height: self.height,
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}
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}
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fn with_height(&self, height: u32) -> Rectangle {
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Rectangle {
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top_left: self.top_left,
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2019-12-31 00:21:43 +00:00
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width: self.width,
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height,
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}
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}
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2019-12-31 00:29:05 +00:00
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fn top_left(&self) -> Point {
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self.top_left
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}
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fn top_right(&self) -> Point {
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Point::new(self.top_left.x() + self.width, self.top_left.y())
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}
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fn bottom_right(&self) -> Point {
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Point::new(
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self.top_left.x() + self.width,
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self.top_left.y() + self.height,
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)
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}
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fn bottom_left(&self) -> Point {
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Point::new(self.top_left.x(), self.top_left.y() + self.height)
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}
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fn area(&self) -> u32 {
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self.width * self.height
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}
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fn intersects(&self, other: &Rectangle) -> bool {
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!(self.top_left().right_of(&other.top_right())
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|| self.top_left().below(&other.bottom_left())
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|| self.top_right().left_of(&other.top_left())
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|| self.bottom_left().above(&other.top_left()))
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}
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2019-12-31 00:21:43 +00:00
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}
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2019-12-30 17:51:06 +00:00
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_point_get_x() {
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assert_eq!(Point::new(42, 52).x(), 42);
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}
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#[test]
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fn test_point_get_y() {
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assert_eq!(Point::new(42, 52).y(), 52);
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}
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#[test]
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fn test_point_set_x() {
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2019-12-31 00:08:58 +00:00
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assert_eq!(Point::new(42, 52).with_x(12), Point::new(12, 52));
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2019-12-30 17:51:06 +00:00
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}
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#[test]
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fn test_point_set_y() {
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assert_eq!(Point::new(42, 52).with_y(12), Point::new(42, 12));
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2019-12-30 17:51:06 +00:00
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}
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#[test]
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fn test_point_left_of() {
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assert!(Point::new(10, 20).left_of(&Point::new(20, 20)));
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assert!(!Point::new(10, 11).left_of(&Point::new(10, 11)));
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assert!(!Point::new(10, 11).left_of(&Point::new(8, 11)));
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}
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#[test]
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fn test_point_right_of() {
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assert!(Point::new(10, 20).right_of(&Point::new(0, 20)));
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assert!(!Point::new(10, 11).right_of(&Point::new(10, 11)));
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assert!(!Point::new(10, 11).right_of(&Point::new(12, 11)));
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}
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#[test]
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fn test_point_above() {
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assert!(Point::new(1, 1).above(&Point::new(1, 2)));
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assert!(!Point::new(10, 11).above(&Point::origin()));
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}
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#[test]
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fn test_point_below() {
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assert!(Point::new(1, 1).below(&Point::new(1, 0)));
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assert!(!Point::new(10, 11).below(&Point::new(12, 11)));
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}
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#[test]
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fn test_point_add() {
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assert_eq!(Point::new(1, 1) + Point::new(10, 10), Point::new(11, 11));
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assert_eq!(
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Point::new(10, 0) + Point::new(0, 10),
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Point::new(0, 10) + Point::new(10, 0)
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);
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}
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}
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