rvlib/tools/
always_active_zoom.rs

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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
use std::fmt::Debug;

use rvimage_domain::{BbF, BbI, ShapeI};

use crate::{
    events::{Events, KeyCode, ZoomAmount},
    history::History,
    make_tool_transform,
    tools::core::Manipulate,
    world::World,
};

use super::{core::Mover, zoom::move_zoom_box};

fn event_move_zoom_box(events: &Events) -> bool {
    events.held_ctrl() && (events.pressed(KeyCode::MouseLeft) || events.held(KeyCode::MouseLeft))
}
fn zoom_box_mouse_wheel(
    zoom_box: Option<BbF>,
    shape_orig: ShapeI,
    amount: ZoomAmount,
) -> Option<BbF> {
    let current_zb = if let Some(zb) = zoom_box {
        zb
    } else {
        BbI::from_arr(&[0, 0, shape_orig.w, shape_orig.h]).into()
    };
    let clip_val = 1.0;
    let factor = match amount {
        ZoomAmount::Delta(y_delta) => {
            let y_delta_clipped = if y_delta > 0.0 {
                y_delta.min(clip_val)
            } else {
                y_delta.max(-clip_val)
            };
            1.0 - y_delta_clipped * 0.1
        }
        ZoomAmount::Factor(factor) => factor,
    };

    Some(current_zb.center_scale(factor, shape_orig))
}

#[derive(Clone, Debug)]
pub struct AlwaysActiveZoom {
    mover: Mover,
}
impl AlwaysActiveZoom {
    fn mouse_pressed(
        &mut self,
        events: &Events,
        world: World,
        history: History,
    ) -> (World, History) {
        if event_move_zoom_box(events) {
            self.mover.move_mouse_pressed(events.mouse_pos_on_view);
        }
        (world, history)
    }

    fn mouse_held(
        &mut self,
        events: &Events,
        mut world: World,
        history: History,
    ) -> (World, History) {
        if event_move_zoom_box(events) {
            (self.mover, world) = move_zoom_box(self.mover, world, events.mouse_pos_on_view);
            (world, history)
        } else {
            (world, history)
        }
    }

    fn key_released(
        &mut self,
        events: &Events,
        mut world: World,
        history: History,
    ) -> (World, History) {
        if events.held_ctrl() {
            let zb = if events.released(KeyCode::Key0) {
                None
            } else if events.released(KeyCode::PlusEquals) {
                zoom_box_mouse_wheel(
                    *world.zoom_box(),
                    world.shape_orig(),
                    ZoomAmount::Delta(1.0),
                )
            } else if events.released(KeyCode::Minus) {
                zoom_box_mouse_wheel(
                    *world.zoom_box(),
                    world.shape_orig(),
                    ZoomAmount::Delta(-1.0),
                )
            } else {
                *world.zoom_box()
            };
            world.set_zoom_box(zb);
        }
        (world, history)
    }
}
impl Manipulate for AlwaysActiveZoom {
    fn new() -> AlwaysActiveZoom {
        AlwaysActiveZoom {
            mover: Mover::new(),
        }
    }
    fn has_been_used(&self, events: &Events) -> Option<bool> {
        let zoomed = events.zoom().is_some()
            || events.held_ctrl()
                && (events.released(KeyCode::Key0)
                    || events.released(KeyCode::PlusEquals)
                    || events.released(KeyCode::Minus));
        Some(zoomed || event_move_zoom_box(events))
    }
    fn events_tf(
        &mut self,
        mut world: World,
        history: History,
        events: &Events,
    ) -> (World, History) {
        let zoom_factor = events.zoom();
        if let Some(z) = zoom_factor {
            let zb = zoom_box_mouse_wheel(*world.zoom_box(), world.shape_orig(), z);
            world.set_zoom_box(zb);
        }
        make_tool_transform!(
            self,
            world,
            history,
            events,
            [
                (pressed, KeyCode::MouseLeft, mouse_pressed),
                (held, KeyCode::MouseLeft, mouse_held),
                (released, KeyCode::Key0, key_released),
                (released, KeyCode::PlusEquals, key_released), // Plus is equals
                (released, KeyCode::Minus, key_released)
            ]
        )
    }
}

#[test]
fn test_zb() {
    fn test(zb: Option<BbF>, y_delta: f64, reference_coords: &[u32; 4]) {
        println!("y_delta {}", y_delta);
        let shape = ShapeI::new(200, 100);
        let zb_new = zoom_box_mouse_wheel(zb, shape, ZoomAmount::Delta(y_delta));
        assert_eq!(zb_new, Some(BbI::from_arr(reference_coords).into()));
    }
    test(None, 1.0, &[10, 5, 180, 90]);
    test(None, -1.0, &[0, 0, 200, 100]);
}