1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
//! Viewport utilities
use crate::{graphics::Vector2, input::InputHandle};
use ggez::{
error::GameResult,
graphics::{self, Rect},
Context,
};
#[derive(Default)]
pub struct Viewport {
start: Vector2,
prev_start: Vector2,
size: Vector2,
}
impl Viewport {
pub fn new() -> Self {
Self::default()
}
pub fn start(&self) -> &Vector2 {
&self.start
}
/// Must be called at least once before calling
/// [`update`](Self::update)
pub fn init(&mut self, ctx: &mut Context) {
let Rect { x, y, w, h } = graphics::screen_coordinates(&ctx);
self.start = Vector2::new(x, y);
self.prev_start = self.start;
self.size = Vector2::new(w, h);
}
/// Update the game state with the curent viewport data
pub fn update(&self, ctx: &mut Context) -> GameResult<()> {
graphics::set_screen_coordinates(
ctx,
Rect {
x: self.start.x,
y: self.start.y,
w: self.size.x,
h: self.size.y,
},
)?;
Ok(())
}
/// Apply changes from the input handle to the viewport
pub fn apply(&mut self, _: &mut Context, input: &InputHandle) -> GameResult<()> {
if input.middle_pressed {
let drag = input.drag_point.as_ref().unwrap().clone();
let pos = input.mouse_pos.clone();
self.start = self.prev_start + (drag - pos);
debug!("Changing VP start: {}", self.start);
} else {
self.prev_start = self.start;
}
Ok(())
}
}
|
