doukutsu-rs/src/frame.rs

use crate::player::Player;
use crate::shared_game_state::SharedGameState;
use crate::stage::Stage;
use crate::common::interpolate_fix9_scale;

pub struct Frame {
    pub x: isize,
    pub y: isize,
    pub prev_x: isize,
    pub prev_y: isize,
    pub wait: isize,
}

impl Frame {
    pub fn xy_interpolated(&self, frame_time: f64, scale: f32) -> (f32, f32) {
        let x = interpolate_fix9_scale(self.prev_x, self.x, frame_time, scale);
        let y = interpolate_fix9_scale(self.prev_y, self.y, frame_time, scale);

        (x, y)
    }

    pub fn immediate_update(&mut self, state: &mut SharedGameState, player: &Player, stage: &Stage) {
        if (stage.map.width - 1) * 16 < state.canvas_size.0 as usize {
            self.x = -(((state.canvas_size.0 as isize - ((stage.map.width - 1) * 16) as isize) * 0x200) / 2);
        } else {
            self.x = player.target_x - (state.canvas_size.0 as isize * 0x200 / 2);

            if self.x < 0 {
                self.x = 0;
            }

            let max_x = (((stage.map.width as isize - 1) * 16) - state.canvas_size.0 as isize) * 0x200;
            if self.x > max_x {
                self.x = max_x;
            }
        }

        if (stage.map.height - 1) * 16 < state.canvas_size.1 as usize {
            self.y = -(((state.canvas_size.1 as isize - ((stage.map.height - 1) * 16) as isize) * 0x200) / 2);
        } else {
            self.y = player.target_y - (state.canvas_size.1 as isize * 0x200 / 2);

            if self.y < 0 {
                self.y = 0;
            }

            let max_y = (((stage.map.height as isize - 1) * 16) - state.canvas_size.1 as isize) * 0x200;
            if self.y > max_y {
                self.y = max_y;
            }
        }

        self.prev_x = self.x;
        self.prev_y = self.y;
    }

    pub fn update(&mut self, state: &mut SharedGameState, player: &Player, stage: &Stage) {
        if (stage.map.width - 1) * 16 < state.canvas_size.0 as usize {
            self.x = -(((state.canvas_size.0 as isize - ((stage.map.width - 1) * 16) as isize) * 0x200) / 2);
        } else {
            self.x += (player.target_x - (state.canvas_size.0 as isize * 0x200 / 2) - self.x) / self.wait;

            if self.x < 0 {
                self.x = 0;
            }

            let max_x = (((stage.map.width as isize - 1) * 16) - state.canvas_size.0 as isize) * 0x200;
            if self.x > max_x {
                self.x = max_x;
            }
        }

        if (stage.map.height - 1) * 16 < state.canvas_size.1 as usize {
            self.y = -(((state.canvas_size.1 as isize - ((stage.map.height - 1) * 16) as isize) * 0x200) / 2);
        } else {
            self.y += (player.target_y - (state.canvas_size.1 as isize * 0x200 / 2) - self.y) / self.wait;

            if self.y < 0 {
                self.y = 0;
            }

            let max_y = (((stage.map.height as isize - 1) * 16) - state.canvas_size.1 as isize) * 0x200;
            if self.y > max_y {
                self.y = max_y;
            }
        }

        if state.quake_counter > 0 {
            state.quake_counter -= 1;

            self.x += state.effect_rng.range(-0x300..0x300) as isize;
            self.y += state.effect_rng.range(-0x300..0x300) as isize;
        }
    }
}