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use crate::transform::Transform;
use raylib::drawing::RaylibDraw;
use raylib::ffi::Color;
pub const LINE_COLOUR: Color = Color {
r: 255,
g: 255,
b: 255,
a: 75,
};
/// Draw an infinite grid that can be moved around on the screen and zoomed in and out of.
pub fn draw_grid<D>(rld: &mut D, screen_width: i32, screen_height: i32, transform: &Transform)
where
D: RaylibDraw,
{
/* Calculate the actual screen offset of the grid, by modulo-ing the translation of the
* transform.
*/
let translation_x_px: i32 =
transform.translation_px().x as i32 % transform.pixels_per_m() as i32;
let translation_y_px: i32 =
transform.translation_px().y as i32 % transform.pixels_per_m() as i32;
// Draw the row lines.
let mut line_y: f32 = translation_y_px as f32;
while line_y <= screen_height as f32 {
rld.draw_line(0, line_y as i32, screen_width, line_y as i32, LINE_COLOUR);
line_y += transform.pixels_per_m();
}
// Draw the column lines.
let mut line_x: f32 = translation_x_px as f32;
while line_x <= screen_width as f32 {
rld.draw_line(line_x as i32, 0, line_x as i32, screen_height, LINE_COLOUR);
line_x += transform.pixels_per_m();
}
}
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