62 lines
1.9 KiB
Rust
62 lines
1.9 KiB
Rust
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// Copyright 2013 The Lmath Developers. For a full listing of the authors,
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// refer to the AUTHORS file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::num;
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use color::{Channel, HSV, ToHSV};
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#[path = "../num_macros.rs"]
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mod num_macros;
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#[deriving(Clone, Eq)]
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pub struct RGB<T> { r: T, g: T, b: T }
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impl<T> RGB<T> {
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#[inline]
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pub fn new(r: T, g: T, b: T) -> RGB<T> {
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RGB { r: r, g: g, b: b }
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}
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}
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pub trait ToRGB<T> {
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pub fn to_rgb(&self) -> RGB<T>;
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}
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impl<T:Clone + Channel + Float> ToHSV<T> for RGB<T> {
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pub fn to_hsv(&self) -> HSV<T> {
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// Algorithm taken from the Wikipedia article on HSL and HSV:
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// http://en.wikipedia.org/wiki/HSL_and_HSV#From_HSV
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let mx = (*self).r.max(&(*self).g).max(&(*self).b);
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let mn = (*self).r.min(&(*self).g).min(&(*self).b);
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let chr = mx - mn;
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if chr != zero!(T) {
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let h = cond! (
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((*self).r == mx) { (((*self).g - (*self).b) / chr) % num::cast(6) }
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((*self).g == mx) { (((*self).b - (*self).r) / chr) + num::cast(2) }
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_ /* (*self).b == mx */ { (((*self).r - (*self).g) / chr) + num::cast(4) }
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) * num::cast(60);
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let s = chr / mx;
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HSV::new(h, s, mx)
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} else {
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HSV::new(zero!(T), zero!(T), mx)
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}
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}
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}
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