public/subjects/drawing/README.md

drawing

Instructions

The purpose of this exercise is to create an image like the example bellow:

You will need to do the following:

• Copy the code in the usage to your main.rs.

• Create a module called geometrical_shapes in another file.

You'll define the logic for creating and working with shapes in geometrical_shapes. Create the following traits:

• Drawable which contains the methods draw and color.

• Displayable which contains the method display.

Define them according to the way they are called in the main.rs function.

In order to compile and run main.rs, you'll need to define some structures. You are free to implement all the shapes with whatever internal structure you see fit, but you must provide an associated function new for all the shapes, which will be described below:

• Point: a new point should be created from two i32 values.
• Line: a new line should be created from references to two different points.
• Triangle: a new triangle should be created from references to three different points.
• Rectangle: a new rectangle should be created from references to two different points.
• Circle: a new circle should be created from a point representing the center and an i32 value representing the circle's radius.

You'll also need to create the associated function random for Line, Point and Circle. You should derive their signature from the usage.

Don't forget to add the dependencies in your Cargo.toml.

Bonus

Implement the following shapes, including their structure and traits needed to draw them:

• Pentagon
• Cube

Usage

mod geometrical_shapes;

use geometrical_shapes as gs;
use gs::{Displayable, Drawable};
use raster::{Color, Image};

fn main() {
    let mut image = Image::blank(1000, 1000);

    gs::Line::random(image.width, image.height).draw(&mut image);

    gs::Point::random(image.width, image.height).draw(&mut image);

    let rectangle = gs::Rectangle::new(&gs::Point::new(150, 150), &gs::Point::new(50, 50));
    rectangle.draw(&mut image);

    let triangle = gs::Triangle::new (
            &gs::Point::new(500, 500),
            &gs::Point::new(250, 700),
            &gs::Point::new(700, 800),
    );
    triangle.draw(&mut image);

    for _ in 1..50 {
        gs::Circle::random(image.width, image.height).draw(&mut image);
    }

    raster::save(&image, "image.png").unwrap();
}

impl Displayable for Image {
    fn display(&mut self, x: i32, y: i32, color: Color) {
        if x >= 0 && x < self.width && y >= 0 && y < self.height {
            self.set_pixel(x, y, color).unwrap();
        }
    }
}

The expected output is a png file: image.png

Notions

• Image processing library

• Traits