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Linear Gradients

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Caleb Fontenot 2024-04-22 07:42:19 +07:00
parent 14c7ba87f7
commit 9180bc84de
1 changed files with 34 additions and 11 deletions
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45
src/displayapp/screens/WatchFaceTerminal.cpp
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@ -133,23 +133,42 @@ WatchFaceTerminal::~WatchFaceTerminal() {
}
std::tuple<float, float, float> hexToFloat(int rgb) {
float r = ((rgb >> 16) & 0xFF) / 255;
float g = ((rgb >> 8) & 0xFF) / 255;
float b = (rgb & 0xFF) / 255;
float r = ((rgb >> 16) & 0xFF);
float g = ((rgb >> 8) & 0xFF);
float b = (rgb & 0xFF);
return std::tuple<float, float, float>(r, g, b);
}
float normalize(float value) {
if (value < 0.0f) {
return 0.0f;
} else if (value > 1.0f) {
return 1.0f;
} else {
return value;
}
}
// reference: https://dev.to/ndesmic/linear-color-gradients-from-scratch-1a0e
std::tuple<float, float, float> lerp(std::tuple<float, float, float> pointA, std::tuple<float, float, float> pointB, float normalValue) {
return std::tuple<float, float, float>(
NRF_LOG_INFO("Normal value: %f", normalValue);
auto lerpOutput = std::tuple<float, float, float>(
get<0>(pointA) + (get<0>(pointB) - get<0>(pointA)) * normalValue,
get<1>(pointA) + (get<1>(pointB) - get<1>(pointA)) * normalValue,
get<2>(pointA) + (get<2>(pointB) - get<2>(pointA)) * normalValue
//std::lerp(get<0>(pointA), get<0>(pointB), normalValue),
//std::lerp(get<1>(pointA), get<1>(pointB), normalValue),
//std::lerp(get<2>(pointA), get<2>(pointB), normalValue)
);
NRF_LOG_INFO("pointA: %f, %f, %f", get<0>(pointA), get<1>(pointA), get<2>(pointA));
NRF_LOG_INFO("pointB: %f, %f, %f", get<0>(pointB), get<1>(pointB), get<2>(pointB));
NRF_LOG_INFO("lerp: %f, %f, %f", get<0>(lerpOutput), get<1>(lerpOutput), get<2>(lerpOutput));
return lerpOutput;
}
const char* TemperatureColor(int16_t temperature) {
const std::vector<int> colors = {0x0000ff, 0xff9b00, 0xff0000};
const std::vector<int> colors = {0x5555ff, 0xff9b00, 0xff0000};
std::vector<std::tuple<float, float, float>> stops;
for (auto colorVal: colors) {
stops.emplace_back(hexToFloat(colorVal));
@ -158,11 +177,15 @@ WatchFaceTerminal::~WatchFaceTerminal() {
if (tempRounded < 0) {
tempRounded = 1;
}
// convert temperature to range between 0 and 1
float oldRange = (56 - 0);
float newRange = (1 - 0);
float newValue = (((tempRounded - 0) * newRange) / oldRange) + 1;
// convert temperature to range between newMin and newMax
float oldMax = 100;
float oldMin = 0;
float newMax = 1;
float newMin = 0;
float oldRange = (oldMax - oldMin);
float newRange = (newMax - newMin);
float newValue = (((tempRounded - oldMin) * newRange) / oldRange) + newMin;
newValue = normalize(newValue);
if (newValue <= .5f) {
return floatToRgbHex(lerp(stops[0], stops[1], newValue));
} else {
@ -222,7 +245,7 @@ void WatchFaceTerminal::Refresh() {
temp = Controllers::SimpleWeatherService::CelsiusToFahrenheit(temp);
tempUnit = 'F';
}
auto color = "ff9b00";
auto color = TemperatureColor(temp);
//TemperatureColor(temp);
NRF_LOG_INFO("Color hex: %s", color);
lv_label_set_text_fmt(weatherStatus, "[WTHR]#%s %d#°%c %s", color, RoundTemperature(temp), tempUnit, WeatherString(weatherId));