docs: add some lines of documentation to clear doubts

src/layout.rs

@@ -374,6 +374,12 @@ pub struct Rect {
 impl Rect {
     /// Creates a new rect, with width and height limited to keep the area under max u16.
     /// If clipped, aspect ratio will be preserved.
+    /// 
+    /// The X Axis represents the count of columns of the Rect.
+    /// 
+    /// The Y Axis represents the count of rows of the Rect.
+    /// 
+    /// The Rect is always drawn from the top left to the bottom and to the right of the container.
     pub fn new(x: u16, y: u16, width: u16, height: u16) -> Rect {
         let max_area = u16::max_value();
         let (clipped_width, clipped_height) =

src/widgets/canvas/line.rs

@@ -4,6 +4,14 @@ use crate::{
 };
 
 /// Shape to draw a line from (x1, y1) to (x2, y2) with the given color
+/// 
+/// The X Axis represents the count of columns of the Line.
+/// 
+/// The Y Axis represents the count of rows of the Line.
+/// 
+/// The Line is always drawn from the top left to the bottom and to the right of the container.
+/// 
+/// And when it is drawn, it will calculate the distance between the two points
 #[derive(Debug, Clone)]
 pub struct Line {
     pub x1: f64,

src/widgets/canvas/points.rs

@@ -4,6 +4,12 @@ use crate::{
 };
 
 /// A shape to draw a group of points with the given color
+/// 
+/// The X Axis represents the count of columns of the container.
+/// 
+/// The Y Axis represents the count of rows of the container.
+/// 
+/// The first value of the coordinate is the X axis, the second value is the Y axis.
 #[derive(Debug, Clone)]
 pub struct Points<'a> {
     pub coords: &'a [(f64, f64)],

src/widgets/canvas/rectangle.rs

@@ -4,6 +4,12 @@ use crate::{
 };
 
 /// Shape to draw a rectangle from a `Rect` with the given color
+/// 
+/// The X Axis represents the count of columns of the Rectangle.
+/// 
+/// The Y Axis represents the count of rows of the Rectangle.
+/// 
+/// The Rectangle is always drawn from the top left to the bottom and to the right of the container.
 #[derive(Debug, Clone)]
 pub struct Rectangle {
     pub x: f64,