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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| //! Visualization code | ||
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| use std::convert::TryFrom; | ||
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| use wasm_bindgen::{Clamped, JsValue}; | ||
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| pub(crate) struct Image { | ||
| data: Vec<u8>, | ||
| width: usize, | ||
| height: usize, | ||
| resolution: usize, | ||
| } | ||
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| impl Image { | ||
| pub(crate) fn new(width: usize, height: usize, resolution: usize) -> Self { | ||
| let width = width * resolution; | ||
| let height = height * resolution; | ||
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| let data = vec![0_u8; 4 * width * height]; | ||
| Self { | ||
| data, | ||
| width, | ||
| height, | ||
| resolution, | ||
| } | ||
| } | ||
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| /// color a resolution by resolution square at (i*resolution, j*resolution) | ||
| pub(crate) fn paint(&mut self, i: usize, j: usize, color: [u8; 4]) { | ||
| for ii in 0..self.resolution { | ||
| for jj in 0..self.resolution { | ||
| let i = i * self.resolution + ii; | ||
| let j = j * self.resolution + jj; | ||
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| let index = 4 * (i + j * self.width); | ||
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| self.data[index] = color[0]; | ||
| self.data[index + 1] = color[1]; | ||
| self.data[index + 2] = color[2]; | ||
| self.data[index + 3] = color[3]; | ||
| } | ||
| } | ||
| } | ||
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| /// Returns the size of the image in pixels. | ||
| pub(crate) fn size(&self) -> (usize, usize) { | ||
| (self.width, self.height) | ||
| } | ||
| } | ||
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| impl TryFrom<Image> for web_sys::ImageData { | ||
| type Error = JsValue; | ||
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| fn try_from(image: Image) -> Result<Self, Self::Error> { | ||
| let Image { | ||
| data, | ||
| width, | ||
| height, | ||
| .. | ||
| } = image; | ||
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| web_sys::ImageData::new_with_u8_clamped_array_and_sh( | ||
| Clamped(&data), | ||
| width as u32, | ||
| height as u32, | ||
| ) | ||
| } | ||
| } | ||
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| pub(crate) trait Colormap { | ||
| fn get_color(&self, x: f32, min_: f32, max_: f32) -> [u8; 4]; | ||
| } | ||
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| pub(crate) struct JetColormap {} | ||
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| impl Colormap for JetColormap { | ||
| fn get_color(&self, x: f32, min_: f32, max_: f32) -> [u8; 4] { | ||
| let x = f32::min(f32::max(x, min_), max_ - 0.0001); | ||
| let d = max_ - min_; | ||
| let x = if d == 0. { 0.5 } else { (x - min_) / d }; | ||
| let m = 0.25; | ||
| let num = f32::floor(x / m); | ||
| let s = (x - num * m) / m; | ||
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| let (r, g, b) = match num as u8 { | ||
| 0 => (0.0, s, 1.0), | ||
| 1 => (0.0, 1.0, 1. - s), | ||
| 2 => (s, 1.0, 0.), | ||
| 3 => (1.0, 1.0 - s, 0.0), | ||
| 4 => (1.0, 1.0 - s, 0.0), | ||
| _ => panic!("should not happen"), | ||
| }; | ||
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| let r = (r * 255.0) as u8; | ||
| let g = (g * 255.0) as u8; | ||
| let b = (b * 255.0) as u8; | ||
| [r, g, b, 255] | ||
| } | ||
| } | ||
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| pub(crate) struct CoolWarmColormap {} | ||
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| impl Colormap for CoolWarmColormap { | ||
| fn get_color(&self, x: f32, min_: f32, max_: f32) -> [u8; 4] { | ||
| let x = f32::min(f32::max(x, min_), max_ - 0.0001); | ||
| let d = max_ - min_; | ||
| let x = if d == 0. { 0.5 } else { (x - min_) / d }; | ||
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| let r = 0.5 * (1.0 + x); | ||
| let b = 1.0 - r; | ||
| let g = 1.0 - (r + b); | ||
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| let r = (r * 255.0) as u8; | ||
| let g = (g * 255.0) as u8; | ||
| let b = (b * 255.0) as u8; | ||
| [r, g, b, 255] | ||
| } | ||
| } | ||
|
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| /// Rainbow colormap | ||
| pub(crate) struct RainbowColormap {} | ||
|
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| impl Colormap for RainbowColormap { | ||
| fn get_color(&self, x: f32, min_: f32, max_: f32) -> [u8; 4] { | ||
| let x = f32::min(f32::max(x, min_), max_ - 0.0001); | ||
| let d = max_ - min_; | ||
| let x = if d == 0. { 0.5 } else { (x - min_) / d }; | ||
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| let r = if x < 0.5 { | ||
| 1.0 - 2.0 * x | ||
| } else { | ||
| 2.0 * (x - 0.5) | ||
| }; | ||
| let g = if x < 0.5 { 2.0 * x } else { 2.0 * (1.0 - x) }; | ||
| let b = if x < 0.5 { 2.0 * x } else { 0.0 }; | ||
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| let r = (r * 255.0) as u8; | ||
| let g = (g * 255.0) as u8; | ||
| let b = (b * 255.0) as u8; | ||
| [r, g, b, 255] | ||
| } | ||
| } | ||
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| pub(crate) fn colormap(colormap: &str) -> Box<dyn Colormap> { | ||
| match colormap { | ||
| "jet" => Box::new(JetColormap {}), | ||
| "coolwarm" => Box::new(CoolWarmColormap {}), | ||
| "rainbow" => Box::new(RainbowColormap {}), | ||
| _ => panic!("unknown colormap"), | ||
| } | ||
| } |