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use cgmath::{Vector3, Zero};
use crate::buffer::Buffer;
type Vector = Vector3<f32>;
#[derive(Debug)]
pub struct ScreenIterator {
pub corner_position: Vector,
pub vertical_edge: Vector,
pub horizontal_edge: Vector,
pub horizontal_step: Vector,
pub vertical_step: Vector,
buffer_width: usize,
buffer_height: usize,
current_index: usize,
}
impl ScreenIterator {
pub fn from_screen_position(
corner_position: Vector,
vertical_edge: Vector,
horizontal_edge: Vector,
) -> Self {
Self {
corner_position,
vertical_edge,
horizontal_edge,
vertical_step: Vector::zero(),
horizontal_step: Vector::zero(),
current_index: 0,
buffer_width: 0,
buffer_height: 0,
}
}
pub fn set_buffer_size(&mut self, buffer: &Buffer) {
self.buffer_width = buffer.width as usize;
self.buffer_height = buffer.height as usize;
self.horizontal_step = self.horizontal_edge / buffer.width;
self.vertical_step = self.vertical_edge / buffer.height;
}
}
impl Iterator for ScreenIterator {
type Item = Vector;
fn next(&mut self) -> Option<Self::Item> {
let pixel_x = self.current_index % self.buffer_width;
let pixel_y = self.current_index / self.buffer_width;
if self.current_index < self.buffer_width * self.buffer_height {
self.current_index += 1;
Some(
self.corner_position
+ self.horizontal_step * pixel_x as f32
+ self.vertical_step * pixel_y as f32,
)
} else {
None
}
}
}
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