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Feature: LinearGradient color decorator. (#592)

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Based on the existing color decorators, create new ones to apply a gradient effect on the DOM.

Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>
This commit is contained in:
Vinicius Moura Longaray
2023-03-22 09:59:02 -03:00
committed by GitHub
parent 2991b0389e
commit e83e90ced2
20 changed files with 671 additions and 106 deletions
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15
src/ftxui/screen/color.cpp
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@@ -1,6 +1,7 @@
#include "ftxui/screen/color.hpp"
#include <array> // for array
#include <array> // for array
#include <cmath>
#include <string_view> // for literals
#include "ftxui/screen/color_info.hpp" // for GetColorInfo, ColorInfo
@@ -220,12 +221,12 @@ Color Color::Interpolate(float t, const Color& a, const Color& b) {
get_color(a, &red_a, &green_a, &blue_a);
get_color(b, &red_b, &green_b, &blue_b);
return Color::RGB(static_cast<uint8_t>(static_cast<float>(red_a) * (1 - t) +
static_cast<float>(red_b) * t),
static_cast<uint8_t>(static_cast<float>(green_a) * (1 - t) +
static_cast<float>(green_b) * t),
static_cast<uint8_t>(static_cast<float>(blue_a) * (1 - t) +
static_cast<float>(blue_b) * t));
// Gamma correction:
// https://en.wikipedia.org/wiki/Gamma_correction
return Color::RGB(
pow(pow(red_a, 2.2f) * (1 - t) + pow(red_b, 2.2f) * t, 1 / 2.2f),
pow(pow(green_a, 2.2f) * (1 - t) + pow(green_b, 2.2f) * t, 1 / 2.2f),
pow(pow(blue_a, 2.2f) * (1 - t) + pow(blue_b, 2.2f) * t, 1 / 2.2f));
}
inline namespace literals {

8
src/ftxui/screen/color_test.cpp
View File

@@ -57,22 +57,22 @@ TEST(ColorTest, Interpolate) {
Color::RGB(1, 2, 3), //
Color::RGB(244, 244, 123)) //
.Print(false),
"38;2;73;74;39");
"38;2;141;141;71");
EXPECT_EQ(Color::Interpolate(0.7f, //
Color::RGB(1, 2, 3), //
Color::RGB(244, 244, 123)) //
.Print(false),
"38;2;171;171;87");
"38;2;207;207;104");
EXPECT_EQ(Color::Interpolate(0.7f, //
Color(Color::Red), //
Color::RGB(244, 244, 123)) //
.Print(false),
"38;2;209;170;86");
"38;2;216;207;104");
EXPECT_EQ(Color::Interpolate(0.7f, //
Color::RGB(244, 244, 123), //
Color(Color::Plum1)) //
.Print(false),
"38;2;251;195;215");
"38;2;251;198;225");
}
TEST(ColorTest, HSV) {