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add matplotlib and simple gradient colormaps

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Wim Pomp
2025-08-23 22:12:25 +02:00
parent 5ce9790118
commit cdaee07627
9 changed files with 811 additions and 27987 deletions
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8
Cargo.toml
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@@ -1,10 +1,10 @@
[package]
name = "colorcet"
version = "0.1.0"
version = "0.2.0"
edition = "2024"
rust-version = "1.85.1"
authors = ["Wim Pomp <w.pomp@nki.nl>"]
license = "CC-BY"
license = "CC-BY-4.0 AND PSF-2.0 AND MIT"
description = "Colorcet colormaps."
homepage = "https://github.com/wimpomp/colorcet"
repository = "https://github.com/wimpomp/colorcet"
@@ -13,5 +13,7 @@ keywords = ["color", "colormap", "color-scales", "visualization", "gradient"]
categories = ["graphics", "visualization"]
[dependencies]
phf = { version = "0.12.1", features = ["macros"] }
colorgrad = "0.7.2"
num-traits = "0.2.19"
phf = { version = "0.13.1", features = ["macros"] }
thiserror = "2.0.16"

263
LICENSE
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@@ -1,250 +1,19 @@
Creative Commons Attribution 4.0 International Public License (CC-BY)
Copyright (c) 2025 Wim Pomp
By exercising the Licensed Rights (defined below), You accept and agree
to be bound by the terms and conditions of this Creative Commons
Attribution 4.0 International Public License ("Public License"). To the
extent this Public License may be interpreted as a contract, You are
granted the Licensed Rights in consideration of Your acceptance of
these terms and conditions, and the Licensor grants You such rights in
consideration of benefits the Licensor receives from making the
Licensed Material available under these terms and conditions.
Permission is hereby granted, free of charge, to any person obtaining a copy
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copies of the Software, and to permit persons to whom the Software is
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Rights that is derived from or based upon the Licensed Material and
in which the Licensed Material is translated, altered, arranged,
transformed, or otherwise modified in a manner requiring permission
under the Copyright and Similar Rights held by the Licensor. For
purposes of this Public License, where the Licensed Material is a
musical work, performance, or sound recording, Adapted Material is
always produced where the Licensed Material is synched in timed
relation with a moving image.
b. Adapter's License means the license You apply to Your Copyright and
Similar Rights in Your contributions to Adapted Material in
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c. Copyright and Similar Rights means copyright and/or similar rights
closely related to copyright including, without limitation,
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Rights, without regard to how the rights are labeled or
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absence of proper authority, may not be circumvented under laws
fulfilling obligations under Article 11 of the WIPO Copyright
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Licensor authorizes You to exercise the Licensed Rights in all
media and formats whether now known or hereafter created, and
to make technical modifications necessary to do so. The
Licensor waives and/or agrees not to assert any right or
authority to forbid You from making technical modifications
necessary to exercise the Licensed Rights, including technical
modifications necessary to circumvent Effective Technological
Measures. For purposes of this Public License, simply making
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recipient of the Licensed Material automatically receives
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reasonable manner based on the medium, means, and context in
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reasonable to satisfy the conditions by providing a URI or
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License You apply must not prevent recipients of the Adapted
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Where the Licensed Rights include Sui Generis Database Rights that
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right to extract, reuse, reproduce, and Share all or a substantial
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contents in a database in which You have Sui Generis Database
Rights, then the database in which You have Sui Generis Database
Rights (but not its individual contents) is Adapted Material; and
c. You must comply with the conditions in Section [12]3(a) if You
Share all or a substantial portion of the contents of the database.
For the avoidance of doubt, this Section [13]4 supplements and does not
replace Your obligations under this Public License where the Licensed
Rights include other Copyright and Similar Rights.
Section 5 - Disclaimer of Warranties and Limitation of Liability.
a. Unless otherwise separately undertaken by the Licensor, to the
extent possible, the Licensor offers the Licensed Material as-is
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non-infringement, absence of latent or other defects, accuracy, or
the presence or absence of errors, whether or not known or
discoverable. Where disclaimers of warranties are not allowed in
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the Licensed Material, even if the Licensor has been advised of the
possibility of such losses, costs, expenses, or damages. Where a
limitation of liability is not allowed in full or in part, this
limitation may not apply to You.
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above shall be interpreted in a manner that, to the extent
possible, most closely approximates an absolute disclaimer and
waiver of all liability.
Section 6 - Term and Termination.
a. This Public License applies for the term of the Copyright and
Similar Rights licensed here. However, if You fail to comply with
this Public License, then Your rights under this Public License
terminate automatically.
b. Where Your right to use the Licensed Material has terminated under
Section [14]6(a), it reinstates:
1. automatically as of the date the violation is cured, provided
it is cured within 30 days of Your discovery of the violation;
or
2. upon express reinstatement by the Licensor.
For the avoidance of doubt, this Section [15]6(b) does not affect
any right the Licensor may have to seek remedies for Your
violations of this Public License.
c. For the avoidance of doubt, the Licensor may also offer the
Licensed Material under separate terms or conditions or stop
distributing the Licensed Material at any time; however, doing so
will not terminate this Public License.
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of this Public License.
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a. The Licensor shall not be bound by any additional or different
terms or conditions communicated by You unless expressly agreed.
b. Any arrangements, understandings, or agreements regarding the
Licensed Material not stated herein are separate from and
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not be interpreted to, reduce, limit, restrict, or impose
conditions on any use of the Licensed Material that could lawfully
be made without permission under this Public License.
b. To the extent possible, if any provision of this Public License is
deemed unenforceable, it shall be automatically reformed to the
minimum extent necessary to make it enforceable. If the provision
cannot be reformed, it shall be severed from this Public License
without affecting the enforceability of the remaining terms and
conditions.
c. No term or condition of this Public License will be waived and no
failure to comply consented to unless expressly agreed to by the
Licensor.
d. Nothing in this Public License constitutes or may be interpreted as
a limitation upon, or waiver of, any privileges and immunities that
apply to the Licensor or You, including from the legal processes of
any jurisdiction or authority.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

250
LICENSE_colorcet Normal file
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@@ -0,0 +1,250 @@
Creative Commons Attribution 4.0 International Public License (CC-BY)
By exercising the Licensed Rights (defined below), You accept and agree
to be bound by the terms and conditions of this Creative Commons
Attribution 4.0 International Public License ("Public License"). To the
extent this Public License may be interpreted as a contract, You are
granted the Licensed Rights in consideration of Your acceptance of
these terms and conditions, and the Licensor grants You such rights in
consideration of benefits the Licensor receives from making the
Licensed Material available under these terms and conditions.
Section 1 - Definitions.
a. Adapted Material means material subject to Copyright and Similar
Rights that is derived from or based upon the Licensed Material and
in which the Licensed Material is translated, altered, arranged,
transformed, or otherwise modified in a manner requiring permission
under the Copyright and Similar Rights held by the Licensor. For
purposes of this Public License, where the Licensed Material is a
musical work, performance, or sound recording, Adapted Material is
always produced where the Licensed Material is synched in timed
relation with a moving image.
b. Adapter's License means the license You apply to Your Copyright and
Similar Rights in Your contributions to Adapted Material in
accordance with the terms and conditions of this Public License.
c. Copyright and Similar Rights means copyright and/or similar rights
closely related to copyright including, without limitation,
performance, broadcast, sound recording, and Sui Generis Database
Rights, without regard to how the rights are labeled or
categorized. For purposes of this Public License, the rights
specified in Section [5]2(b)(1)-(2) are not Copyright and Similar
Rights.
d. Effective Technological Measures means those measures that, in the
absence of proper authority, may not be circumvented under laws
fulfilling obligations under Article 11 of the WIPO Copyright
Treaty adopted on December 20, 1996, and/or similar international
agreements.
e. Exceptions and Limitations means fair use, fair dealing, and/or any
other exception or limitation to Copyright and Similar Rights that
applies to Your use of the Licensed Material.
f. Licensed Material means the artistic or literary work, database, or
other material to which the Licensor applied this Public License.
g. Licensed Rights means the rights granted to You subject to the
terms and conditions of this Public License, which are limited to
all Copyright and Similar Rights that apply to Your use of the
Licensed Material and that the Licensor has authority to license.
h. Licensor means the individual(s) or entity(ies) granting rights
under this Public License.
i. Share means to provide material to the public by any means or
process that requires permission under the Licensed Rights, such as
reproduction, public display, public performance, distribution,
dissemination, communication, or importation, and to make material
available to the public including in ways that members of the
public may access the material from a place and at a time
individually chosen by them.
j. Sui Generis Database Rights means rights other than copyright
resulting from Directive 96/9/EC of the European Parliament and of
the Council of 11 March 1996 on the legal protection of databases,
as amended and/or succeeded, as well as other essentially
equivalent rights anywhere in the world.
k. You means the individual or entity exercising the Licensed Rights
under this Public License. Your has a corresponding meaning.
Section 2 - Scope.
a. License grant.
1. Subject to the terms and conditions of this Public License,
the Licensor hereby grants You a worldwide, royalty-free,
non-sublicensable, non-exclusive, irrevocable license to
exercise the Licensed Rights in the Licensed Material to:
A. reproduce and Share the Licensed Material, in whole or in
part; and
B. produce, reproduce, and Share Adapted Material.
2. Exceptions and Limitations. For the avoidance of doubt, where
Exceptions and Limitations apply to Your use, this Public
License does not apply, and You do not need to comply with its
terms and conditions.
3. Term. The term of this Public License is specified in Section
[6]6(a).
4. Media and formats; technical modifications allowed. The
Licensor authorizes You to exercise the Licensed Rights in all
media and formats whether now known or hereafter created, and
to make technical modifications necessary to do so. The
Licensor waives and/or agrees not to assert any right or
authority to forbid You from making technical modifications
necessary to exercise the Licensed Rights, including technical
modifications necessary to circumvent Effective Technological
Measures. For purposes of this Public License, simply making
modifications authorized by this Section [7]2(a)(4) never
produces Adapted Material.
5. Downstream recipients.
A. Offer from the Licensor - Licensed Material. Every
recipient of the Licensed Material automatically receives
an offer from the Licensor to exercise the Licensed
Rights under the terms and conditions of this Public
License.
B. No downstream restrictions. You may not offer or impose
any additional or different terms or conditions on, or
apply any Effective Technological Measures to, the
Licensed Material if doing so restricts exercise of the
Licensed Rights by any recipient of the Licensed
Material.
6. No endorsement. Nothing in this Public License constitutes or
may be construed as permission to assert or imply that You
are, or that Your use of the Licensed Material is, connected
with, or sponsored, endorsed, or granted official status by,
the Licensor or others designated to receive attribution as
provided in Section [8]3(a)(1)(A)(i).
b. Other rights.
1. Moral rights, such as the right of integrity, are not licensed
under this Public License, nor are publicity, privacy, and/or
other similar personality rights; however, to the extent
possible, the Licensor waives and/or agrees not to assert any
such rights held by the Licensor to the limited extent
necessary to allow You to exercise the Licensed Rights, but
not otherwise.
2. Patent and trademark rights are not licensed under this Public
License.
3. To the extent possible, the Licensor waives any right to
collect royalties from You for the exercise of the Licensed
Rights, whether directly or through a collecting society under
any voluntary or waivable statutory or compulsory licensing
scheme. In all other cases the Licensor expressly reserves any
right to collect such royalties.
Section 3 - License Conditions.
Your exercise of the Licensed Rights is expressly made subject to the
following conditions.
a. Attribution.
1. If You Share the Licensed Material (including in modified
form), You must:
A. retain the following if it is supplied by the Licensor
with the Licensed Material:
i. identification of the creator(s) of the Licensed
Material and any others designated to receive
attribution, in any reasonable manner requested by
the Licensor (including by pseudonym if designated);
ii. a copyright notice;
iii. a notice that refers to this Public License;
iv. a notice that refers to the disclaimer of
warranties;
v. a URI or hyperlink to the Licensed Material to the
extent reasonably practicable;
B. indicate if You modified the Licensed Material and retain
an indication of any previous modifications; and
C. indicate the Licensed Material is licensed under this
Public License, and include the text of, or the URI or
hyperlink to, this Public License.
2. You may satisfy the conditions in Section [9]3(a)(1) in any
reasonable manner based on the medium, means, and context in
which You Share the Licensed Material. For example, it may be
reasonable to satisfy the conditions by providing a URI or
hyperlink to a resource that includes the required
information.
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information required by Section [10]3(a)(1)(A) to the extent
reasonably practicable.
4. If You Share Adapted Material You produce, the Adapter's
License You apply must not prevent recipients of the Adapted
Material from complying with this Public License.
Section 4 - Sui Generis Database Rights.
Where the Licensed Rights include Sui Generis Database Rights that
apply to Your use of the Licensed Material:
a. for the avoidance of doubt, Section [11]2(a)(1) grants You the
right to extract, reuse, reproduce, and Share all or a substantial
portion of the contents of the database;
b. if You include all or a substantial portion of the database
contents in a database in which You have Sui Generis Database
Rights, then the database in which You have Sui Generis Database
Rights (but not its individual contents) is Adapted Material; and
c. You must comply with the conditions in Section [12]3(a) if You
Share all or a substantial portion of the contents of the database.
For the avoidance of doubt, this Section [13]4 supplements and does not
replace Your obligations under this Public License where the Licensed
Rights include other Copyright and Similar Rights.
Section 5 - Disclaimer of Warranties and Limitation of Liability.
a. Unless otherwise separately undertaken by the Licensor, to the
extent possible, the Licensor offers the Licensed Material as-is
and as-available, and makes no representations or warranties of any
kind concerning the Licensed Material, whether express, implied,
statutory, or other. This includes, without limitation, warranties
of title, merchantability, fitness for a particular purpose,
non-infringement, absence of latent or other defects, accuracy, or
the presence or absence of errors, whether or not known or
discoverable. Where disclaimers of warranties are not allowed in
full or in part, this disclaimer may not apply to You.
b. To the extent possible, in no event will the Licensor be liable to
You on any legal theory (including, without limitation, negligence)
or otherwise for any direct, special, indirect, incidental,
consequential, punitive, exemplary, or other losses, costs,
expenses, or damages arising out of this Public License or use of
the Licensed Material, even if the Licensor has been advised of the
possibility of such losses, costs, expenses, or damages. Where a
limitation of liability is not allowed in full or in part, this
limitation may not apply to You.
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above shall be interpreted in a manner that, to the extent
possible, most closely approximates an absolute disclaimer and
waiver of all liability.
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a. This Public License applies for the term of the Copyright and
Similar Rights licensed here. However, if You fail to comply with
this Public License, then Your rights under this Public License
terminate automatically.
b. Where Your right to use the Licensed Material has terminated under
Section [14]6(a), it reinstates:
1. automatically as of the date the violation is cured, provided
it is cured within 30 days of Your discovery of the violation;
or
2. upon express reinstatement by the Licensor.
For the avoidance of doubt, this Section [15]6(b) does not affect
any right the Licensor may have to seek remedies for Your
violations of this Public License.
c. For the avoidance of doubt, the Licensor may also offer the
Licensed Material under separate terms or conditions or stop
distributing the Licensed Material at any time; however, doing so
will not terminate this Public License.
d. Sections [16]1, [17]5, [18]6, [19]7, and [20]8 survive termination
of this Public License.
Section 7 - Other Terms and Conditions.
a. The Licensor shall not be bound by any additional or different
terms or conditions communicated by You unless expressly agreed.
b. Any arrangements, understandings, or agreements regarding the
Licensed Material not stated herein are separate from and
independent of the terms and conditions of this Public License.
Section 8 - Interpretation.
a. For the avoidance of doubt, this Public License does not, and shall
not be interpreted to, reduce, limit, restrict, or impose
conditions on any use of the Licensed Material that could lawfully
be made without permission under this Public License.
b. To the extent possible, if any provision of this Public License is
deemed unenforceable, it shall be automatically reformed to the
minimum extent necessary to make it enforceable. If the provision
cannot be reformed, it shall be severed from this Public License
without affecting the enforceability of the remaining terms and
conditions.
c. No term or condition of this Public License will be waived and no
failure to comply consented to unless expressly agreed to by the
Licensor.
d. Nothing in this Public License constitutes or may be interpreted as
a limitation upon, or waiver of, any privileges and immunities that
apply to the Licensor or You, including from the legal processes of
any jurisdiction or authority.

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breach of its terms and conditions.
7. Nothing in this License Agreement shall be deemed to create any
relationship of agency, partnership, or joint venture between JDH and
Licensee. This License Agreement does not grant permission to use JDH
trademarks or trade name in a trademark sense to endorse or promote
products or services of Licensee, or any third party.
8. By copying, installing or otherwise using matplotlib,
Licensee agrees to be bound by the terms and conditions of this License
Agreement.

14
README.md
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@@ -1,7 +1,11 @@
# Colorcet
Rust copy of Python library [colorcet](https://pypi.org/project/colorcet/).
[Colorcet](https://colorcet.com/) is a set of perceptually uniform colormaps.
Basically list of colormaps copied from [colorcet the python package](https://pypi.org/project/colorcet/),
also see the [colorcet website](https://colorcet.com/)
and [matplotlib](https://pypi.org/project/matplotlib/) together with some colormaps defined by a simple
gradient between black and a named or css color,
generated using [colorgrad](https://crates.io/crates/colorgrad).
Colormaps copied from [colorcet the python package](https://pypi.org/project/colorcet/) are licensed
under a [CC-BY license](LICENSE_colorcet), colormaps copied from
[matplotlib](https://pypi.org/project/matplotlib/) are licensed under [PSF license](LICENSE_matplotlib).
Code in this crate is licensed under a [MIT license](LICENSE).

27485
__init__.py
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34
copy_from_colorcet.py
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@@ -1,18 +1,15 @@
import colorcet
import re
from matplotlib import colormaps
def parse_cmaps() -> list[str]:
pat = re.compile(r"(\s|\[)(\d)(,\s|])")
s = []
for name in colorcet.all_original_names():
cmap = getattr(colorcet, name)
if isinstance(cmap, list) and len(cmap) == 256 and isinstance(cmap[0], list):
c = f"{cmap}"
c = pat.sub(r"\1\2.0\3", c)
c = pat.sub(r"\1\2.0\3", c)
c = pat.sub(r"\1\2.0\3", c)
s.append(f" \"{name}\" => {c},\n")
if isinstance(cmap, list) and isinstance(cmap[0], list):
c = f"&{[[float(i) for i in j] for j in cmap]}"
s.append(f" \"{name.lower()}\" => {c},\n")
return sorted(s)
@@ -21,13 +18,24 @@ def parse_aliases() -> list[str]:
s = []
for name in colorcet.all_original_names():
for alias in pat.split(colorcet.get_aliases(name)):
s.append(f" \"{alias}\" => \"{name}\",\n")
return sorted(s)
s.append(f" \"{alias.lower()}\" => \"{name.lower()}\",\n")
return s
def parse_mpl_cmaps() -> list[str]:
s = []
for name in list(colormaps):
if not name.lower().startswith("cet") and not name.lower().endswith("_r"):
cmap = colormaps[name]
cmap = cmap(range(cmap.N))[:, :3].tolist()
c = f"&{[[float(i) for i in j] for j in cmap]}"
s.append(f" \"{name.lower()}\" => {c},\n")
return s
def main() -> None:
"""extract colormaps from the python package colorcet, run cargo fmt after"""
cmaps = parse_cmaps()
cmaps = parse_cmaps() + parse_mpl_cmaps()
aliases = parse_aliases()
with open("src/colormaps.rs", "w") as f:
@@ -35,15 +43,15 @@ def main() -> None:
f.write("\n")
f.write("/// unique colormaps\n")
f.write("#[allow(clippy::approx_constant)]\n")
f.write("pub static COLOR_MAPS: phf::Map<&'static str, [[f64; 3]; 256]> = phf_map! {\n")
for i in cmaps:
f.write("pub static COLOR_MAPS: phf::Map<&'static str, &[[f64; 3]]> = phf_map! {\n")
for i in sorted(cmaps):
f.write(i)
f.write("};\n")
f.write("\n")
f.write("/// aliases to colormaps\n")
f.write("#[allow(clippy::approx_constant)]\n")
f.write("pub static ALIASES: phf::Map<&'static str, &'static str> = phf_map! {\n")
for i in aliases:
for i in sorted(aliases):
f.write(i)
f.write("};")

444
src/colormaps.rs
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153
src/lib.rs
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@@ -1,6 +1,15 @@
//! Colorcet: a list of [colorcet](https://colorcet.com/),
//! [matplotlib](https://pypi.org/project/matplotlib/) and simple
//! gradient colormaps.
mod colormaps;
use std::ops::Sub;
use colorgrad::{
BasisGradient, CatmullRomGradient, Color, Gradient, GradientBuilder, GradientBuilderError,
LinearGradient,
};
use num_traits::{Bounded, Float, FromPrimitive, NumCast, PrimInt, ToPrimitive};
use std::str::FromStr;
use thiserror::Error;
#[derive(Error, Debug)]
@@ -9,52 +18,78 @@ pub enum ColorcetError {
ColormapNotFound(String),
}
pub trait Int: Sub + Sized {
const MIN: Self;
const MAX: Self;
}
macro_rules! impl_int {
($($t:tt),+ $(,)?) => {
$(
impl Int for $t {
const MIN: Self = $t::MIN;
const MAX: Self = $t::MAX;
}
)*
};
}
impl_int!(
u8, i8, u16, i16, u32, i32, u64, i64, u128, i128, isize, usize
);
pub struct ColorMap([[f64; 3]; 256]);
/// Struct holding f64 values defining the colormap.
///
/// # Examples
/// ```
/// use colorcet::ColorMap;
/// use colorgrad::{LinearGradient, Color};
///
/// let colormap: ColorMap = "glasbey".parse().unwrap();
/// let vec_color: Vec<Color> = colormap.clone().try_into().unwrap();
/// let vec_css: Vec<String> = colormap.clone().try_into().unwrap();
/// let linear_gradient: LinearGradient = colormap.clone().try_into().unwrap();
/// let vec_float: Vec<[f64; 3]> = colormap.clone().get_rgb_float();
/// let vec_int: Vec<[u8; 3]> = colormap.get_rgb_int();
/// ```
#[derive(Clone, Debug)]
pub struct ColorMap(Vec<[f64; 3]>);
impl ColorMap {
/// get a vector of rgb values, scaled between 0.0 and 1.0
pub fn get_colors_f64(&self) -> Vec<Vec<f64>> {
self.0.iter().map(|row| row.to_vec()).collect()
pub fn get_rgb_float<T>(&self) -> Vec<[T; 3]>
where
T: Float + NumCast,
{
self.0
.iter()
.map(|color| {
[
T::from(color[0]).unwrap(),
T::from(color[1]).unwrap(),
T::from(color[2]).unwrap(),
]
})
.collect()
}
/// get a vector of rgb values, scaled between T::MIN and T::MAX
pub fn get_colors_int<T>(&self) -> Vec<Vec<T>>
pub fn get_rgb_int<T>(&self) -> Vec<[T; 3]>
where
T: Int + From<f64>,
f64: From<T>,
T: Bounded + PrimInt + FromPrimitive + ToPrimitive,
{
let a: f64 = T::MIN.into();
let b: f64 = T::MAX.into();
let a: f64 = T::min_value().to_f64().unwrap();
let b: f64 = T::max_value().to_f64().unwrap();
let c = b - a;
self.0
.iter()
.map(|row| row.iter().map(|&i| ((i - a) / c).round().into()).collect())
.map(|color| {
[
T::from_f64(((color[0] - a) / c).round()).unwrap(),
T::from_f64(((color[1] - a) / c).round()).unwrap(),
T::from_f64(((color[2] - a) / c).round()).unwrap(),
]
})
.collect()
}
/// get names of all colormaps defined in this crate
pub fn all_colormap_names() -> Vec<String> {
colormaps::ALIASES
.keys()
.chain(colormaps::COLOR_MAPS.keys())
.map(|k| k.to_string())
.collect()
}
}
/// find a colorcet colormap by name, add _r to reverse the colormap
pub fn get_named_colormap(name: &str) -> Result<ColorMap, ColorcetError> {
impl FromStr for ColorMap {
type Err = ColorcetError;
/// find a colorcet colormap by name, add _r to reverse the colormap
fn from_str(s: &str) -> Result<Self, Self::Err> {
let name = s.to_lowercase();
let name = name.as_str();
let (name0, reverse) = if let Some(name) = name.strip_suffix("_r") {
(name, true)
} else {
@@ -64,7 +99,20 @@ pub fn get_named_colormap(name: &str) -> Result<ColorMap, ColorcetError> {
if let Some(&alias) = colormaps::ALIASES.get(name0)
&& let Some(cmap) = colormaps::COLOR_MAPS.get(alias)
{
let mut cmap = cmap.to_owned();
let mut cmap = cmap.to_vec();
if reverse {
cmap.reverse();
}
Ok(ColorMap(cmap))
} else if let Ok(cmap) = GradientBuilder::new()
.html_colors(&["#000000", name0])
.build::<LinearGradient>()
{
let mut cmap: Vec<_> = cmap
.colors(256)
.into_iter()
.map(|c| [c.r as f64, c.g as f64, c.b as f64])
.collect();
if reverse {
cmap.reverse();
}
@@ -72,4 +120,43 @@ pub fn get_named_colormap(name: &str) -> Result<ColorMap, ColorcetError> {
} else {
Err(ColorcetError::ColormapNotFound(name.into()))
}
}
}
impl From<ColorMap> for Vec<Color> {
fn from(value: ColorMap) -> Self {
value
.get_rgb_float::<f32>()
.into_iter()
.map(|c| Color::from((c[0], c[1], c[2])))
.collect()
}
}
impl From<ColorMap> for Vec<String> {
/// convert ColorMap into a Vec of css color strings
fn from(value: ColorMap) -> Self {
value
.get_rgb_float::<f32>()
.into_iter()
.map(|c| Color::from((c[0], c[1], c[2])).to_css_hex())
.collect()
}
}
macro_rules! impl_to_gradient {
($($t:ty $(,)?)*) => {
$(
impl TryFrom<ColorMap> for $t {
type Error = GradientBuilderError;
fn try_from(value: ColorMap) -> Result<Self, Self::Error> {
let colors: Vec<Color> = value.into();
GradientBuilder::new().colors(&colors).build()
}
}
)*
};
}
impl_to_gradient!(LinearGradient, CatmullRomGradient, BasisGradient);