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

use std::convert;
use std::error;
use std::fmt;
use std::num;

use svg::Document;

const STROKE_COLOR: &'static str = "#000";
const STROKE_OPACITY: f64 = 0.02;
const DARK_FILL_COLOR: &'static str = "#222";
const LIGHT_FILL_COLOR: &'static str = "#ddd";

/// Patterns is a list of available patterns to choose from
#[derive(Debug, Copy, Clone)]
pub enum Patterns {
    Chevrons,
	ConcentricCircles,
	Diamonds,
	Hexagons,
	MosaicSquares,
	NestedSquares,
	Octagons,
	OverlappingCircles,
	OverlappingRings,
	Plaid,
	PlusSigns,
    SineWaves,
	Squares,
	Tessellation,
	Triangles,
	Xes,
}

impl fmt::Display for Patterns {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Patterns::Chevrons => write!(f, "Chevrons"),
            Patterns::ConcentricCircles => write!(f, "ConcentricCircles"),
            Patterns::Diamonds => write!(f, "Diamonds"),
            Patterns::Hexagons => write!(f, "Hexagons"),
            Patterns::MosaicSquares => write!(f, "MosaicSquares"),
            Patterns::NestedSquares => write!(f, "NestedSquares"),
            Patterns::Octagons => write!(f, "Octagons"),
            Patterns::OverlappingCircles => write!(f, "OverlappingCircles"),
            Patterns::OverlappingRings => write!(f, "OverlappingRings"),
            Patterns::Plaid => write!(f, "Plaid"),
            Patterns::PlusSigns => write!(f, "PlusSigns"),
            Patterns::SineWaves => write!(f, "SineWaves"),
            Patterns::Squares => write!(f, "Squares"),
            Patterns::Tessellation => write!(f, "Tessellation"),
            Patterns::Triangles => write!(f, "Triangles"),
            Patterns::Xes => write!(f, "Xes"),
        }
    }
}

/// Pattern is a single pattern that can be used as the structure.
pub trait Pattern {
    /// draw can take a svg document and implement the current patterns structure
    /// on it, and returns the result of that operation.
    fn draw(&self, svg: Document) -> Result<Document, PatternError>;
}

/// PatternError is a wrapped error for all errors
/// originating from the 'Pattern' trait and its implementations
#[derive(Debug)]
pub enum PatternError {
    ParseInt(num::ParseIntError),
}

impl fmt::Display for PatternError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            PatternError::ParseInt(ref e) => e.fmt(f),
        }
    }
}

impl error::Error for PatternError {
    fn description(&self) -> &str {
        match *self {
            PatternError::ParseInt(ref e) => e.description(),
        }
    }

    fn cause(&self) -> Option<&error::Error> {
        match *self {
            PatternError::ParseInt(ref e) => Some(e),
        }
    }
}

impl convert::From<num::ParseIntError> for PatternError {
    fn from(e: num::ParseIntError) -> PatternError {
        PatternError::ParseInt(e)
    }
}

fn rescale(v: f64, amin: f64, amax: f64, bmin: f64, bmax: f64) -> f64 {
    bmax - (amax - v) * ((bmax - bmin) / (amax - amin))
}

fn opacity(v: f64) -> f64 {
    rescale(v, 0.0, 15.0, 0.02, 0.15)
}

fn fill_color(v: u8) -> &'static str {
    if v & 1 == 1 {
        DARK_FILL_COLOR
    } else {
        LIGHT_FILL_COLOR
    }
}

pub mod chevrons;
pub mod concentric_circles;
pub mod diamonds;
pub mod hexagons;
pub mod mosaic_squares;
pub mod nested_squares;
pub mod octagons;
pub mod overlapping_circles;
pub mod overlapping_rings;
pub mod plaid;
pub mod plus_signs;
pub mod sine_waves;
pub mod squares;
pub mod tessellation;
pub mod triangles;
pub mod xes;

pub use self::chevrons::Chevrons;
pub use self::concentric_circles::ConcentricCircles;
pub use self::diamonds::Diamonds;
pub use self::hexagons::Hexagons;
pub use self::mosaic_squares::MosaicSquares;
pub use self::nested_squares::NestedSquares;
pub use self::octagons::Octagons;
pub use self::overlapping_circles::OverlappingCircles;
pub use self::overlapping_rings::OverlappingRings;
pub use self::plaid::Plaid;
pub use self::plus_signs::PlusSigns;
pub use self::sine_waves::SineWaves;
pub use self::squares::Squares;
pub use self::tessellation::Tessellation;
pub use self::triangles::Triangles;
pub use self::xes::Xes;