lerpColor problem

Programming Questions

clankill3r

in Programming Questions • 2 years ago

I think it should go from 60 to 360 counting upwards (in hue), but what it does is counting down i suppose cause i only get yellow, orange, red. Never blue green purple etc.

So i got this:

color cStart;
color cEnd;
void setup(){
colorMode(HSB, 360, 100, 100);
cStart = color(60, 100, 100);
cEnd = color(360, 100, 100);
}
void draw(){
float amt = norm(frameCount % 360, 0, 359);
color bgColor = lerpColor(cStart, cEnd, amt);
background(bgColor);
}

And i expected this:

void setup(){
colorMode(HSB, 360, 100, 100);
}
void draw(){
float h = map(frameCount % 360, 0, 359, 60, 360);
color bgColor = color(h, 100, 100);
background(bgColor);
}

Why does lerpColor not get in that range?

Replies(4)

clankill3r

Re: lerpColor problem

2 years ago

My last example in above post goes threw the color range i want.

why doesnt this?

h is just counting down from 60 and i have no clue why

color startColor;
color endColor;
void setup(){
colorMode(HSB, 360, 100, 100);
startColor = color(60, 100, 100);
endColor = color(360, 100, 100);
}
void draw(){
color bgColor = getTimeColorFromProgram((frameCount % 360), 0, 360);
background(bgColor);
}
color getTimeColorFromProgram(int time, int startTime, int endTime){
if(time >= startTime && time <= endTime){
float amt = norm(time, startTime, endTime);
float h = map(amt, 0, 1, hue(startColor), hue(endColor));
println(h);
float s = map(amt, 0, 1, saturation(startColor), saturation(endColor));
float b = map(amt, 0, 1, brightness(startColor), brightness(endColor));
return color(h, s, b);
}
return color(0);
}

clankill3r

Re: lerpColor problem

2 years ago

i want it to be 60 so it starts by yellow, else it goes from red to red.

So that's not the problem.

nardove

Re: lerpColor problem

2 years ago

Sorry I miss understood, if you print hue(endColor) it returns 0 instead of 360, if change it to 359 will it work for you?

the range is of 360 values so we need to work with 0 up to 359

clankill3r

Re: lerpColor problem

2 years ago

yeah 359 does the trick :)

thanks

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