From 7f2adac0b474c22f16bbfaa9218ebc29f6aa248a Mon Sep 17 00:00:00 2001
From: Jan Beinke <git@janbeinke.com>
Date: Thu, 11 Jun 2020 04:31:04 +0200
Subject: [PATCH] Add hsv function
---
qthing/color.cpp | 41 +++++++++++++++++++++++++++++++++++++++++
qthing/qthing.h | 1 +
2 files changed, 42 insertions(+)
diff --git a/qthing/color.cpp b/qthing/color.cpp
index e8d9147..8a9ccd9 100644
--- a/qthing/color.cpp
+++ b/qthing/color.cpp
@@ -27,4 +27,45 @@ namespace qthing {
return RGB(h * v, 0, (1 - h) * v);
}
}
+
+ RGB hsv(float hue, float saturation, float value) {
+ if(value <= 0)
+ return RGB();
+
+ if(saturation <= 0)
+ return RGB(value, value, value);
+
+ if(saturation > 1)
+ saturation = 1;
+
+ if(value > 1)
+ value = 1;
+
+ hue = fmod(hue, 1);
+ if(hue < 0)
+ ++hue;
+
+ float hh = hue * 6;
+ int i = (int)hh;
+ float ff = hh - i;
+ float p = value * (1.0 - saturation);
+ float q = value * (1.0 - (saturation * ff));
+ float t = value * (1.0 - (saturation * (1.0 - ff)));
+
+ switch(i) {
+ case(0):
+ return RGB(value, t, p);
+ case(1):
+ return RGB(q, value, p);
+ case(2):
+ return RGB(p, value, t);
+ case(3):
+ return RGB(p, q, value);
+ case(4):
+ return RGB(t, p, value);
+ case(5):
+ return RGB(value, p, q);
+ }
+ return RGB();
+ }
}
diff --git a/qthing/qthing.h b/qthing/qthing.h
index 28c50b7..fa045c5 100644
--- a/qthing/qthing.h
+++ b/qthing/qthing.h
@@ -228,6 +228,7 @@ namespace qthing {
};
RGB hue(const float hue, const float value = 1);
+ RGB hsv(float hue, float staturation = 1, float value = 1);
typedef std::function<led_color_t(uint8_t, uint16_t, led_color_t)> led_color_handler_t;
--
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