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//! Responsible for snapping a position with a granularity
//!
//! Most of us are not capable of adjusting everything with sub-pixel accuracy. For us filthy casuals,
//! Snapping was invented. However I hate programs where there is only one option for granularity, so
//! I thought it should be changeable. This module is responsible for snapping and managing the user
//! instructions telling the program what granularity should currently be used, if any.
use crate::gui::DecimalNumBox;
use crate::math::{self, Vec2};
use raylib::drawing::RaylibDrawHandle;
use raylib::ffi::KeyboardKey;
use raylib::RaylibHandle;
/// The struct containing the current snapping information of the program.
pub struct Snapper {
grain: f64,
grain_gui: DecimalNumBox<f64>,
}
impl Snapper {
/// Create a new snapper with the default granularity.
pub fn new() -> Self {
Self::default()
}
/// Update the grain according to the input the program receives.
pub fn update(&mut self, rl: &mut RaylibHandle) {
if !self.grain_gui.active() && rl.is_key_pressed(KeyboardKey::KEY_G) {
self.grain_gui.set_active(true);
}
if !self.grain_gui.active() {
return;
}
self.grain_gui.update(rl);
if rl.is_key_pressed(KeyboardKey::KEY_ENTER) {
self.grain_gui.set_active(false);
self.grain = self.grain_gui.value();
self.grain_gui.set_value(self.grain);
} else if rl.is_key_pressed(KeyboardKey::KEY_ESCAPE) {
self.grain_gui.set_active(false);
self.grain_gui.set_value(self.grain);
}
}
/// Draw the snapper gui
pub fn draw(&self, rld: &mut RaylibDrawHandle) {
self.grain_gui.draw(
rld,
"m",
&Vec2::new(15., (rld.get_screen_height() - 25) as f64),
);
}
/// Get the current granularity of the world snapping in meters. Snapping always starts at (0, 0)
pub fn grain(&self) -> f64 {
self.grain
}
/// Snap a vector to the grid with the factor being the sub-grid accuracy. For instance, 0.5 will
/// snap to half a grid cell, while 2.0 would snap to every second grid cell.
pub fn snap(&self, pos: Vec2<f64>) -> Vec2<f64> {
Vec2::new(
math::round(pos.x, self.grain),
math::round(pos.y, self.grain),
)
}
}
impl Default for Snapper {
fn default() -> Self {
Self {
grain: 0.5,
grain_gui: DecimalNumBox::new(0.5),
}
}
}
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