src/handlers/zoom.rs


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use crate::AppModel;
use crate::constants;

/// Sets the zoom level and updates the rendered image.
pub fn zoom(model: &mut AppModel, level: f64) {
    model.zoom = level;
    model.update_image();
}

/// Decreases zoom by one step if above minimum.
pub fn zoom_out(model: &mut AppModel) {
    let new_zoom = model.zoom - constants::ZOOM_STEP;
    if new_zoom >= constants::MIN_ZOOM {
        model.zoom = new_zoom;
        model.update_image();
    }
}

/// Increases zoom by one step if below maximum.
pub fn zoom_in(model: &mut AppModel) {
    if model.zoom < constants::MAX_ZOOM {
        model.zoom += constants::ZOOM_STEP;
        model.update_image();
    }
}