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

//! One- and two-dimensional alignment ([`Align::Center`], [`Align2::LEFT_TOP`] etc).

use crate::*;

/// left/center/right or top/center/bottom alignment for e.g. anchors and layouts.
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
pub enum Align {
    /// Left or top.
    Min,

    /// Horizontal or vertical center.
    Center,

    /// Right or bottom.
    Max,
}

impl Align {
    /// Convenience for [`Self::Min`]
    pub const LEFT: Self = Self::Min;
    /// Convenience for [`Self::Max`]
    pub const RIGHT: Self = Self::Max;
    /// Convenience for [`Self::Min`]
    pub const TOP: Self = Self::Min;
    /// Convenience for [`Self::Max`]
    pub const BOTTOM: Self = Self::Max;

    #[deprecated = "Use Self::LEFT"]
    pub fn left() -> Self {
        Self::LEFT
    }
    #[deprecated = "Use Self::RIGHT"]
    pub fn right() -> Self {
        Self::RIGHT
    }
    #[deprecated = "Use Self::TOP"]
    pub fn top() -> Self {
        Self::TOP
    }
    #[deprecated = "Use Self::BOTTOM"]
    pub fn bottom() -> Self {
        Self::BOTTOM
    }

    /// Convert `Min => 0.0`, `Center => 0.5` or `Max => 1.0`.
    #[inline(always)]
    pub fn to_factor(self) -> f32 {
        match self {
            Self::Min => 0.0,
            Self::Center => 0.5,
            Self::Max => 1.0,
        }
    }

    /// Convert `Min => -1.0`, `Center => 0.0` or `Max => 1.0`.
    #[inline(always)]
    pub fn to_sign(self) -> f32 {
        match self {
            Self::Min => -1.0,
            Self::Center => 0.0,
            Self::Max => 1.0,
        }
    }
}

impl Default for Align {
    #[inline(always)]
    fn default() -> Align {
        Align::Min
    }
}

// ----------------------------------------------------------------------------

/// Two-dimension alignment, e.g. [`Align2::LEFT_TOP`].
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
pub struct Align2(pub [Align; 2]);

impl Align2 {
    pub const LEFT_BOTTOM: Align2 = Align2([Align::Min, Align::Max]);
    pub const LEFT_CENTER: Align2 = Align2([Align::Min, Align::Center]);
    pub const LEFT_TOP: Align2 = Align2([Align::Min, Align::Min]);
    pub const CENTER_BOTTOM: Align2 = Align2([Align::Center, Align::Max]);
    pub const CENTER_CENTER: Align2 = Align2([Align::Center, Align::Center]);
    pub const CENTER_TOP: Align2 = Align2([Align::Center, Align::Min]);
    pub const RIGHT_BOTTOM: Align2 = Align2([Align::Max, Align::Max]);
    pub const RIGHT_CENTER: Align2 = Align2([Align::Max, Align::Center]);
    pub const RIGHT_TOP: Align2 = Align2([Align::Max, Align::Min]);
}

impl Align2 {
    #[inline(always)]
    pub fn x(self) -> Align {
        self.0[0]
    }

    #[inline(always)]
    pub fn y(self) -> Align {
        self.0[1]
    }

    /// -1, 0, or +1 for each axis
    pub fn to_sign(self) -> Vec2 {
        vec2(self.x().to_sign(), self.y().to_sign())
    }

    /// Used e.g. to anchor a piece of text to a part of the rectangle.
    /// Give a position within the rect, specified by the aligns
    pub fn anchor_rect(self, rect: Rect) -> Rect {
        let x = match self.x() {
            Align::Min => rect.left(),
            Align::Center => rect.left() - 0.5 * rect.width(),
            Align::Max => rect.left() - rect.width(),
        };
        let y = match self.y() {
            Align::Min => rect.top(),
            Align::Center => rect.top() - 0.5 * rect.height(),
            Align::Max => rect.top() - rect.height(),
        };
        Rect::from_min_size(pos2(x, y), rect.size())
    }

    /// e.g. center a size within a given frame
    pub fn align_size_within_rect(self, size: Vec2, frame: Rect) -> Rect {
        let x = match self.x() {
            Align::Min => frame.left(),
            Align::Center => frame.center().x - size.x / 2.0,
            Align::Max => frame.right() - size.x,
        };
        let y = match self.y() {
            Align::Min => frame.top(),
            Align::Center => frame.center().y - size.y / 2.0,
            Align::Max => frame.bottom() - size.y,
        };

        Rect::from_min_size(Pos2::new(x, y), size)
    }

    pub fn pos_in_rect(self, frame: &Rect) -> Pos2 {
        let x = match self.x() {
            Align::Min => frame.left(),
            Align::Center => frame.center().x,
            Align::Max => frame.right(),
        };
        let y = match self.y() {
            Align::Min => frame.top(),
            Align::Center => frame.center().y,
            Align::Max => frame.bottom(),
        };

        pos2(x, y)
    }
}

pub fn center_size_in_rect(size: Vec2, frame: Rect) -> Rect {
    Align2::CENTER_CENTER.align_size_within_rect(size, frame)
}