Cadrs 0.1.2

Cadsdk for rust
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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181

use crate::geometry::Point;
use crate::math::Vector2;

#[derive(Debug, Clone, Copy, PartialEq)]
pub struct ViewRect {
    pub min_x: f64,
    pub min_y: f64,
    pub max_x: f64,
    pub max_y: f64,
}

impl ViewRect {
    pub fn new(min_x: f64, min_y: f64, max_x: f64, max_y: f64) -> Self {
        Self { min_x, min_y, max_x, max_y }
    }

    pub fn width(&self) -> f64 {
        self.max_x - self.min_x
    }

    pub fn height(&self) -> f64 {
        self.max_y - self.min_y
    }

    pub fn center(&self) -> (f64, f64) {
        ((self.min_x + self.max_x) / 2.0, (self.min_y + self.max_y) / 2.0)
    }

    pub fn contains(&self, x: f64, y: f64) -> bool {
        x >= self.min_x && x <= self.max_x && y >= self.min_y && y <= self.max_y
    }

    pub fn expand(&self, factor: f64) -> Self {
        let cx = (self.min_x + self.max_x) / 2.0;
        let cy = (self.min_y + self.max_y) / 2.0;
        let hw = self.width() / 2.0 * factor;
        let hh = self.height() / 2.0 * factor;
        
        Self::new(cx - hw, cy - hh, cx + hw, cy + hh)
    }
}

#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Viewport {
    pub origin: (f64, f64),
    pub size: (f64, f64),
    pub zoom: f64,
    pub rotation: f64,
    pub view_rect: ViewRect,
}

impl Viewport {
    pub fn new() -> Self {
        Self {
            origin: (0.0, 0.0),
            size: (800.0, 600.0),
            zoom: 1.0,
            rotation: 0.0,
            view_rect: ViewRect::new(0.0, 0.0, 800.0, 600.0),
        }
    }

    pub fn with_size(width: f64, height: f64) -> Self {
        let view_rect = ViewRect::new(0.0, 0.0, width, height);
        Self {
            origin: (0.0, 0.0),
            size: (width, height),
            zoom: 1.0,
            rotation: 0.0,
            view_rect,
        }
    }

    pub fn set_view(&mut self, x: f64, y: f64, width: f64, height: f64) {
        self.view_rect = ViewRect::new(x, y, x + width, y + height);
    }

    pub fn pan(&mut self, dx: f64, dy: f64) {
        self.origin.0 += dx;
        self.origin.1 += dy;
        self.view_rect.min_x += dx;
        self.view_rect.max_x += dx;
        self.view_rect.min_y += dy;
        self.view_rect.max_y += dy;
    }

    pub fn zoom_at(&mut self, factor: f64, center_x: f64, center_y: f64) {
        let before_width = self.view_rect.width();
        let before_height = self.view_rect.height();
        
        self.zoom *= factor;
        
        let after_width = before_width / factor;
        let after_height = before_height / factor;
        
        let cx = (self.view_rect.min_x + self.view_rect.max_x) / 2.0;
        let cy = (self.view_rect.min_y + self.view_rect.max_y) / 2.0;
        
        self.view_rect.min_x = cx - after_width / 2.0;
        self.view_rect.max_x = cx + after_width / 2.0;
        self.view_rect.min_y = cy - after_height / 2.0;
        self.view_rect.max_y = cy + after_height / 2.0;
    }

    pub fn zoom_extents(&mut self, rect: ViewRect) {
        let padding = 1.1;
        let width = rect.width() * padding;
        let height = rect.height() * padding;
        
        let cx = (rect.min_x + rect.max_x) / 2.0;
        let cy = (rect.min_y + rect.max_y) / 2.0;
        
        self.view_rect.min_x = cx - width / 2.0;
        self.view_rect.max_x = cx + width / 2.0;
        self.view_rect.min_y = cy - height / 2.0;
        self.view_rect.max_y = cy + height / 2.0;
    }

    pub fn world_to_screen(&self, x: f64, y: f64) -> (f64, f64) {
        let vw = self.view_rect.width();
        let vh = self.view_rect.height();
        let sw = self.size.0;
        let sh = self.size.1;
        
        let screen_x = (x - self.view_rect.min_x) / vw * sw;
        let screen_y = sh - (y - self.view_rect.min_y) / vh * sh;
        
        (screen_x, screen_y)
    }

    pub fn screen_to_world(&self, x: f64, y: f64) -> (f64, f64) {
        let vw = self.view_rect.width();
        let vh = self.view_rect.height();
        let sw = self.size.0;
        let sh = self.size.1;
        
        let world_x = self.view_rect.min_x + x / sw * vw;
        let world_y = self.view_rect.min_y + (sh - y) / sh * vh;
        
        (world_x, world_y)
    }
}

impl Default for Viewport {
    fn default() -> Self {
        Self::new()
    }
}

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

    #[test]
    fn test_view_rect() {
        let rect = ViewRect::new(0.0, 0.0, 100.0, 100.0);
        assert_eq!(rect.width(), 100.0);
        assert_eq!(rect.height(), 100.0);
        assert!(rect.contains(50.0, 50.0));
        assert!(!rect.contains(150.0, 150.0));
    }

    #[test]
    fn test_viewport_world_to_screen() {
        let mut viewport = Viewport::with_size(800.0, 600.0);
        viewport.set_view(0.0, 0.0, 100.0, 100.0);
        
        let (sx, sy) = viewport.world_to_screen(50.0, 50.0);
        assert!((sx - 400.0).abs() < 1e-10);
        assert!((sy - 300.0).abs() < 1e-10);
    }

    #[test]
    fn test_viewport_pan() {
        let mut viewport = Viewport::new();
        viewport.pan(100.0, 50.0);
        
        assert_eq!(viewport.origin.0, 100.0);
        assert_eq!(viewport.origin.1, 50.0);
    }
}