CiColor PhilipsHueLight::rgbToCiColor(float red, float green, float blue) {
// Apply gamma correction.
float r = (red > 0.04045f) ? powf((red + 0.055f) / (1.0f + 0.055f), 2.4f) : (red / 12.92f);
float g = (green > 0.04045f) ? powf((green + 0.055f) / (1.0f + 0.055f), 2.4f) : (green / 12.92f);
float b = (blue > 0.04045f) ? powf((blue + 0.055f) / (1.0f + 0.055f), 2.4f) : (blue / 12.92f);
// Convert to XYZ space.
float X = r * 0.649926f + g * 0.103455f + b * 0.197109f;
float Y = r * 0.234327f + g * 0.743075f + b * 0.022598f;
float Z = r * 0.0000000f + g * 0.053077f + b * 1.035763f;
// Convert to x,y space.
float cx = X / (X + Y + Z);
float cy = Y / (X + Y + Z);
if (std::isnan(cx)) {
cx = 0.0f;
}
if (std::isnan(cy)) {
cy = 0.0f;
}
// RGB to HSV/B Conversion after gamma correction use V for brightness, not Y from XYZ Space.
float bri = fmax(fmax(r, g), b);
CiColor xy = { cx, cy, bri };
// Check if the given XY value is within the color reach of our lamps.
if (!isPointInLampsReach(xy)) {
// It seems the color is out of reach let's find the closes color we can produce with our lamp and send this XY value out.
CiColor pAB = getClosestPointToPoint(colorSpace.red, colorSpace.green, xy);
CiColor pAC = getClosestPointToPoint(colorSpace.blue, colorSpace.red, xy);
CiColor pBC = getClosestPointToPoint(colorSpace.green, colorSpace.blue, xy);
// Get the distances per point and see which point is closer to our Point.
float dAB = getDistanceBetweenTwoPoints(xy, pAB);
float dAC = getDistanceBetweenTwoPoints(xy, pAC);
float dBC = getDistanceBetweenTwoPoints(xy, pBC);
float lowest = dAB;
CiColor closestPoint = pAB;
if (dAC < lowest) {
lowest = dAC;
closestPoint = pAC;
}
if (dBC < lowest) {
lowest = dBC;
closestPoint = pBC;
}
// Change the xy value to a value which is within the reach of the lamp.
xy.x = closestPoint.x;
xy.y = closestPoint.y;
}
return xy;
}
MyLines::MyLines(float x11, float y11, float x22, float y22, float anglee){
x1 = x11;
x2 = x22;
y1 = y11;
y2 = y22;
slope = (y22 - y11) / (x22 - x11);
angle = anglee;
midpointX = (x2 + x1) / 2;
midpointY = (y2 + y1) / 2;
length = getDistanceBetweenTwoPoints(x1, y1, x2, y2);
ceilLength = ceil(length);
}