oxihuman-viewer 0.2.1

wgpu/WebGPU rendering adapter for OxiHuman
Documentation 
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

// Copyright (C) 2026 COOLJAPAN OU (Team KitaSan)
// SPDX-License-Identifier: Apache-2.0

#![allow(dead_code)]

//! F-curve graph editor view state.

/// State for the F-curve graph editor.
#[allow(dead_code)]
#[derive(Debug, Clone, PartialEq)]
pub struct GraphEditorView {
    /// First visible frame.
    pub frame_start: f32,
    /// Last visible frame.
    pub frame_end: f32,
    /// Minimum visible value (y-axis bottom).
    pub value_min: f32,
    /// Maximum visible value (y-axis top).
    pub value_max: f32,
    /// Horizontal zoom factor.
    pub zoom_x: f32,
    /// Vertical zoom factor.
    pub zoom_y: f32,
}

/// Return the default graph editor view.
#[allow(dead_code)]
pub fn default_graph_editor_view() -> GraphEditorView {
    GraphEditorView {
        frame_start: 0.0,
        frame_end: 250.0,
        value_min: -1.0,
        value_max: 1.0,
        zoom_x: 1.0,
        zoom_y: 1.0,
    }
}

/// Convert a frame number to an x pixel within the given pixel width.
#[allow(dead_code)]
pub fn frame_to_screen_x(view: &GraphEditorView, frame: f32, width: f32) -> f32 {
    let range = (view.frame_end - view.frame_start).max(1.0);
    ((frame - view.frame_start) / range) * width * view.zoom_x
}

/// Convert a curve value to a y pixel within the given pixel height (y increases downward).
#[allow(dead_code)]
pub fn value_to_screen_y(view: &GraphEditorView, val: f32, height: f32) -> f32 {
    let range = (view.value_max - view.value_min).abs().max(1e-6);
    ((view.value_max - val) / range) * height * view.zoom_y
}

/// Convert an x pixel to a frame number.
#[allow(dead_code)]
pub fn screen_to_frame(view: &GraphEditorView, x: f32, width: f32) -> f32 {
    let range = (view.frame_end - view.frame_start).max(1.0);
    x / (width * view.zoom_x) * range + view.frame_start
}

/// Convert a y pixel to a curve value.
#[allow(dead_code)]
pub fn screen_to_value(view: &GraphEditorView, y: f32, height: f32) -> f32 {
    let range = (view.value_max - view.value_min).abs().max(1e-6);
    view.value_max - y / (height * view.zoom_y) * range
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn default_value_range() {
        let v = default_graph_editor_view();
        assert_eq!(v.value_min, -1.0);
        assert_eq!(v.value_max, 1.0);
    }

    #[test]
    fn frame_to_x_at_start_is_zero() {
        let v = default_graph_editor_view();
        let x = frame_to_screen_x(&v, v.frame_start, 500.0);
        assert!(x.abs() < 1e-5);
    }

    #[test]
    fn frame_to_x_at_end_is_width() {
        let v = default_graph_editor_view();
        let x = frame_to_screen_x(&v, v.frame_end, 500.0);
        assert!((x - 500.0).abs() < 1e-3);
    }

    #[test]
    fn frame_round_trip() {
        let v = default_graph_editor_view();
        let frame = 75.0;
        let x = frame_to_screen_x(&v, frame, 600.0);
        let back = screen_to_frame(&v, x, 600.0);
        assert!((back - frame).abs() < 1e-4);
    }

    #[test]
    fn value_round_trip() {
        let v = default_graph_editor_view();
        let val = 0.3;
        let y = value_to_screen_y(&v, val, 400.0);
        let back = screen_to_value(&v, y, 400.0);
        assert!((back - val).abs() < 1e-4);
    }

    #[test]
    fn value_max_maps_to_zero_y() {
        let v = default_graph_editor_view();
        let y = value_to_screen_y(&v, v.value_max, 400.0);
        assert!(y.abs() < 1e-5);
    }

    #[test]
    fn zoom_x_doubles_x() {
        let mut v = default_graph_editor_view();
        let x1 = frame_to_screen_x(&v, 125.0, 500.0);
        v.zoom_x = 2.0;
        let x2 = frame_to_screen_x(&v, 125.0, 500.0);
        assert!((x2 - x1 * 2.0).abs() < 1e-3);
    }

    #[test]
    fn zoom_y_doubles_y() {
        let mut v = default_graph_editor_view();
        let y1 = value_to_screen_y(&v, 0.0, 400.0);
        v.zoom_y = 2.0;
        let y2 = value_to_screen_y(&v, 0.0, 400.0);
        assert!((y2 - y1 * 2.0).abs() < 1e-3);
    }

    #[test]
    fn default_zoom_is_one() {
        let v = default_graph_editor_view();
        assert_eq!(v.zoom_x, 1.0);
        assert_eq!(v.zoom_y, 1.0);
    }
}