//! # Transform
//!
//! Transforms are the "functions" in an iterated function system. They take in a point,
//! and generate a new point. For fractal flames, transforms are always affine,
//! but produce more interesting images once we add variations.
use bytemuck::{Pod, Zeroable};
use glam::{Affine2, Vec2};

/// Affine transform for use in the [`chaos_game`](crate::chaos_game).
#[derive(Copy, Clone, Pod, Zeroable)]
#[repr(C)]
pub struct Transform {
    coefficients: Affine2,
}

impl Transform {
    /// Create a new transform from an affine transformation matrix
    pub fn new(coefficients: Affine2) -> Self {
        Transform { coefficients }
    }

    /// Apply this transform to a point in IFS coordinates, producing a new point
    pub fn transform_point(&self, point: Vec2) -> Vec2 {
        self.coefficients.transform_point2(point)
    }
}