Add shift transform

src/main.rs

@@ -1,5 +1,6 @@
 pub mod convert;
 pub mod pattern;
+pub mod transform;
 
 mod error;
 mod printer;
@@ -17,6 +18,7 @@ pub use vec::*;
 
 use crate::convert::*;
 use crate::pattern::*;
+use crate::transform::*;
 use clap::{Parser, ValueEnum};
 use crossterm::style::Color;
 use crossterm::style::Color::*;
@@ -43,6 +45,8 @@ struct Args {
     colors: Vec<PalletEnum>,
     #[clap(long, value_enum)]
     color_pattern: Vec<PatternEnum>,
+    #[clap(long)]
+    color_shift: Option<bool>,
 }
 
 #[derive(ValueEnum, Clone)]
@@ -81,53 +85,23 @@ enum PatternEnum {
     Wheel,
 }
 
-fn main() -> Result<(), Error> {
+#[derive(derive_more::Constructor)]
-    let args = Args::parse();
+struct PatternConfig<'a> {
-    let rand = &mut thread_rng();
+    patterns: &'a Vec<PatternEnum>,
-
+    shift: Option<bool>,
-    let char: Box<dyn PatternFactory> = create_pattern(choose(args.char_pattern, rand));
-    let color: Box<dyn PatternFactory> = create_pattern(choose(args.color_pattern, rand));
-    let pallet = create_pallet(choose(args.colors, rand));
-
-    let sampler = SamplerFactoryImpl::new(char, color);
-    let char_converter = CharConverterImpl::new(args.chars);
-    let color_converter = ColorConverterImpl::new(pallet);
-    let converter = ConverterImpl::new(char_converter, color_converter);
-    let term = TerminalImpl::new(stdout());
-    let printer = PrinterImpl::new(term)?;
-    let renderer = RendererImpl::new(sampler, converter, printer);
-
-    let clock = ClockImpl::default();
-    let duration = Duration::from_millis(args.duration);
-    let delay = Duration::from_nanos(1_000_000_000 / args.fps);
-    let timer = Timer::new(clock, duration, delay);
-
-    timer.run(renderer)
 }
 
-fn choose<TValue: ValueEnum + Clone, TRand: Rng>(options: Vec<TValue>, rand: &mut TRand) -> TValue {
+impl Args {
-    if options.is_empty() {
+    fn char_config(&self) -> PatternConfig {
-        TValue::value_variants()
+        PatternConfig::new(&self.char_pattern, Some(true))
-            .iter()
-            .choose(rand)
-            .unwrap()
-            .clone()
-    } else {
-        options.iter().choose(rand).unwrap().clone()
-    }
     }
 
-fn create_pattern(pattern: PatternEnum) -> Box<dyn PatternFactory> {
+    fn color_config(&self) -> PatternConfig {
-    match pattern {
+        PatternConfig::new(&self.color_pattern, self.color_shift)
-        PatternEnum::Circle => Box::new(CircleFactory::default()),
-        PatternEnum::Line => Box::new(LineFactory::default()),
-        PatternEnum::Rhombus => Box::new(RhombusFactory::default()),
-        PatternEnum::Wheel => Box::new(WheelFactory::default()),
-    }
     }
 
-fn create_pallet(colors: PalletEnum) -> Vec<Color> {
+    fn pallet(&self, rand: &mut impl Rng) -> Vec<Color> {
-    match colors {
+        match choose(&self.colors, rand) {
             PalletEnum::Red => vec![DarkRed, Red, White],
             PalletEnum::Yellow => vec![DarkYellow, Yellow, White],
             PalletEnum::Green => vec![DarkGreen, Green, White],
@@ -161,3 +135,63 @@ fn create_pallet(colors: PalletEnum) -> Vec<Color> {
             PalletEnum::Gray => vec![Black, DarkGrey, Grey, White],
         }
     }
+}
+
+impl<'a> PatternConfig<'a> {
+    fn create_base(&self, rand: &mut impl Rng) -> Box<dyn PatternFactory> {
+        match choose(self.patterns, rand) {
+            PatternEnum::Circle => Box::new(CircleFactory::default()),
+            PatternEnum::Line => Box::new(LineFactory::default()),
+            PatternEnum::Rhombus => Box::new(RhombusFactory::default()),
+            PatternEnum::Wheel => Box::new(WheelFactory::default()),
+        }
+    }
+
+    fn create(&self, rand: &mut impl Rng) -> Box<dyn PatternFactory> {
+        let mut pattern = self.create_base(rand);
+
+        if self.shift.unwrap_or(rand.gen()) {
+            pattern = Box::new(ShiftFactory::new(pattern))
+        }
+        pattern
+    }
+}
+
+fn choose<TValue: ValueEnum + Clone, TRand: Rng>(
+    options: &Vec<TValue>,
+    rand: &mut TRand,
+) -> TValue {
+    if options.is_empty() {
+        TValue::value_variants()
+            .iter()
+            .choose(rand)
+            .unwrap()
+            .clone()
+    } else {
+        options.iter().choose(rand).unwrap().clone()
+    }
+}
+
+fn main() -> Result<(), Error> {
+    let args = Args::parse();
+    let rand = &mut thread_rng();
+
+    let char = args.char_config().create(rand);
+    let color = args.color_config().create(rand);
+    let pallet = args.pallet(rand);
+
+    let sampler = SamplerFactoryImpl::new(char, color);
+    let char_converter = CharConverterImpl::new(args.chars);
+    let color_converter = ColorConverterImpl::new(pallet);
+    let converter = ConverterImpl::new(char_converter, color_converter);
+    let term = TerminalImpl::new(stdout());
+    let printer = PrinterImpl::new(term)?;
+    let renderer = RendererImpl::new(sampler, converter, printer);
+
+    let clock = ClockImpl::default();
+    let duration = Duration::from_millis(args.duration);
+    let delay = Duration::from_nanos(1_000_000_000 / args.fps);
+    let timer = Timer::new(clock, duration, delay);
+
+    timer.run(renderer)
+}

src/transform/mod.rs

@@ -0,0 +1,3 @@
+mod shift;
+
+pub use shift::*;

src/transform/shift.rs

@@ -0,0 +1,25 @@
+use crate::pattern::*;
+use crate::Vector;
+
+#[derive(derive_more::Constructor)]
+pub struct ShiftFactory {
+    child: Box<dyn PatternFactory>,
+}
+
+#[derive(derive_more::Constructor)]
+pub struct Shift {
+    child: Box<dyn Pattern>,
+    shift: f32,
+}
+
+impl PatternFactory for ShiftFactory {
+    fn create(&self, config: &Config) -> Box<dyn Pattern> {
+        Box::new(Shift::new(self.child.create(config), config.step))
+    }
+}
+
+impl Pattern for Shift {
+    fn sample(&self, pos: Vector) -> f32 {
+        self.child.sample(pos) + 1.0 - 2.0 * self.shift
+    }
+}