42 lines
1.3 KiB
D
42 lines
1.3 KiB
D
/* DrawOfPages: Take notes with touchscreen input.
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* Copyright (C) 2019 Marko Semet
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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module dop.structures.base;
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public
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{
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/++
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+ Color in RGBA format
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+/
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struct ColorRGBA
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{
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double r = 0; /++ Red channel +/
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double g = 0; /++ Green channel +/
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double b = 0; /++ Blue channel +/
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double a = 1; /++ Alpha channel +/
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/++
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+ Calculate the luminance of the color.
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+ Returns: The luminance
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+/
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@property
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double getLuma() const
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{
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return ((65.481 * this.r) + (128.553 * this.g) + (24.966 * this.b)) / 255.;
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}
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}
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} |