dlugosc fali elektromagnetycznej a kolor RGB /C++

Shaolineq OP · 09-02-2012 22:49

potrzebuje jak najprostszy kod do programu w c++ ktory obliczalby skladowe RGB na podstawie podanej przez uzytkownika dlugosci fali w nanometrach

http://darekk.com/kalkulator/wavelength-to-rgb takie cos jak tu tylko ze na samych liczbach, bez wizualizacji

nie wiem czy ten kod dziala ale jest w C ktorego nie znam
[to nie jest C, tylko jakis pascal - gray]

Kod:

PROCEDURE WavelengthToRGB(CONST Wavelength:  Nanometers;
                          VAR R,G,B:  BYTE);
  CONST
    Gamma        =   0.80;
    IntensityMax = 255;
  VAR
    Blue   :  DOUBLE;
    factor :  DOUBLE;
    Green  :  DOUBLE;
    Red    :  DOUBLE;
  FUNCTION Adjust(CONST Color, Factor:  DOUBLE):  INTEGER;
  BEGIN
    IF   Color = 0.0
    THEN RESULT := 0     // Don't want 0^x = 1 for x <> 0
    ELSE RESULT := ROUND(IntensityMax * Power(Color * Factor, Gamma))
  END {Adjust};
BEGIN
  CASE TRUNC(Wavelength) OF
    380..439:
      BEGIN
        Red   := -(Wavelength - 440) / (440 - 380);
        Green := 0.0;
        Blue  := 1.0
      END;
    440..489:
      BEGIN
        Red   := 0.0;
        Green := (Wavelength - 440) / (490 - 440);
        Blue  := 1.0
      END;
    490..509:
      BEGIN
        Red   := 0.0;
        Green := 1.0;
        Blue  := -(Wavelength - 510) / (510 - 490)
      END;
    510..579:
      BEGIN
        Red   := (Wavelength - 510) / (580 - 510);
        Green := 1.0;
        Blue  := 0.0
      END;
    580..644:
      BEGIN
        Red   := 1.0;
        Green := -(Wavelength - 645) / (645 - 580);
        Blue  := 0.0
      END;
    645..780:
      BEGIN
        Red   := 1.0;
        Green := 0.0;
        Blue  := 0.0
      END;
    ELSE
      Red   := 0.0;
      Green := 0.0;
      Blue  := 0.0
  END;
  // Let the intensity fall off near the vision limits
  CASE TRUNC(Wavelength) OF
    380..419:  factor := 0.3 + 0.7*(Wavelength - 380) / (420 - 380);
    420..700:  factor := 1.0;
    701..780:  factor := 0.3 + 0.7*(780 - Wavelength) / (780 - 700)
    ELSE       factor := 0.0
  END;
  R := Adjust(Red,   Factor);
  G := Adjust(Green, Factor);
  B := Adjust(Blue,  Factor)
END {WavelengthToRGB};

Visher · 10-02-2012 19:27

W źródłach strony masz kod javascript, na c++ łatwo go przerobić.

Kod:

<script language="JavaScript" type="text/javascript"> //<![CDATA[


// http://www.efg2.com/Lab/ScienceAndEngineering/Spectra.htm
// http://www.midnightkite.com/color.html
// http://www.philiplaven.com/p19.html


var Wavelength


function WavelengthToRGB(Wavelength, hex) {


    var Red;
    var Green;
    var Blue;


    if (Wavelength >= 380 && Wavelength <= 439) {
        Red = -(Wavelength - 440) / (440 - 380);
        Green = 0.0;
        Blue = 1.0;
    } else if (Wavelength >= 440 && Wavelength <= 489) {
        Red = 0.0;
        Green = (Wavelength - 440) / (490 - 440);
        Blue = 1.0;
    } else if (Wavelength >= 490 && Wavelength <= 509) {
        Red = 0.0;
        Green = 1.0;
        Blue = -(Wavelength - 510) / (510 - 490);
    } else if (Wavelength >= 510 && Wavelength <= 579) {
        Red = (Wavelength - 510) / (580 - 510);
        Green = 1.0;
        Blue = 0.0;
    } else if (Wavelength >= 580 && Wavelength <= 644) {
        Red = 1.0;
        Green = -(Wavelength - 645) / (645 - 580);
        Blue = 0.0;
    } else if (Wavelength >= 645 && Wavelength <= 780) {
        Red = 1.0;
        Green = 0.0;
        Blue = 0.0;
    } else {
        Red = 0.0;
        Green = 0.0;
        Blue = 0.0;
    }


    if (Wavelength >= 380 && Wavelength <= 419) {
        factor = 0.3 + 0.7*(Wavelength - 380) / (420 - 380);
    } else if (Wavelength >= 420 && Wavelength <= 700) {
        factor = 1.0;
    } else if (Wavelength >= 701 && Wavelength <= 780) {
        factor = 0.3 + 0.7*(780 - Wavelength) / (780 - 700);
    } else {
        factor= 0.0;
    }


    var R = Adjust(Red, factor);
    var G = Adjust(Green, factor);
    var B = Adjust(Blue, factor);


    if (hex == null)
        return ['rgb(' + R + ', ' + G + ', ' + B + ')', null]
    else
        return ['rgb(' + R + ', ' + G + ', ' + B + ')', decToHex(R) + decToHex(G) + decToHex(B)];


}


function namalujSpektrum(Wavelength) {


    var styl = '';
    var di = 1;
    for (i = 380; i < 781; i += di) {
        styl = styl + '<SPAN style="width: ' + di + 'px; background-color: ' + WavelengthToRGB(i)[0] + ';" onClick="getColor(' + i + ');">&nbsp;</SPAN>';
    }
    document.getElementById("spectrum").innerHTML = styl;


}


function zaznacz(Wavelength) {


    var di = 1;
    var styl = '';
    if (Wavelength >= 380 && Wavelength <= 780)
        styl = '<SPAN style="width: ' + (Math.floor(Wavelength / di) * di - 380) + 'px;">&nbsp;</SPAN><SPAN style="width: ' + di + 'px; background-color: ' + WavelengthToRGB(Wavelength)[0] + ';">&nbsp;</SPAN>';
    document.getElementById("spectrum2").innerHTML = styl;


}


function pomaluj(x) {


    if (x == null) document.getElementById("lambda").value = 550;
    Wavelength = document.getElementById("lambda").value;
    var kolor = new Array();
    kolor = WavelengthToRGB(Wavelength, true);


    document.getElementById("tablica").style.backgroundColor = kolor[0];
    document.getElementById("podpis").innerHTML = kolor[0] + ' &nbsp;&nbsp;&nbsp;hex: #' + kolor[1];


    if (x == null) namalujSpektrum(Wavelength);
    zaznacz(Wavelength);


}


function Adjust(Color, Factor) {


    var Gamma = 0.80;
    var IntensityMax = 255;


    if (Color == 0.0) return 0
    else return Math.round(IntensityMax * Math.pow(Color * Factor, Gamma));


}


function getColor(i) {


    Wavelength = i;
    document.getElementById("lambda").value = Wavelength;
    pomaluj(true);


}


function decToHex(x) {
    var hex = Number(x).toString(16);
    hex = "00".substr(0, 2 - hex.length) + hex;
    return hex;
}


//]]>
</script>

niemoralny · 10-02-2012 20:25

Kod:

#include <cstdlib>
#include <iostream>
#include <math.h>

using namespace std;

int main(int argc, char *argv[])
{
    float R,G,B;
    float Red;
    float Green;
    float Blue;
    float Wavelength;
    cin>>Wavelength;

    if (Wavelength >= 380 && Wavelength <= 439) {
        Red = -(Wavelength - 440) / (440 - 380);
        Green = 0.0;
        Blue = 1.0;
    } else if (Wavelength >= 440 && Wavelength <= 489) {
        Red = 0.0;
        Green = (Wavelength - 440) / (490 - 440);
        Blue = 1.0;
    } else if (Wavelength >= 490 && Wavelength <= 509) {
        Red = 0.0;
        Green = 1.0;
        Blue = -(Wavelength - 510) / (510 - 490);
    } else if (Wavelength >= 510 && Wavelength <= 579) {
        Red = (Wavelength - 510) / (580 - 510);
        Green = 1.0;
        Blue = 0.0;
    } else if (Wavelength >= 580 && Wavelength <= 644) {
        Red = 1.0;
        Green = -(Wavelength - 645) / (645 - 580);
        Blue = 0.0;
    } else if (Wavelength >= 645 && Wavelength <= 780) {
        Red = 1.0;
        Green = 0.0;
        Blue = 0.0;
    } else {
        Red = 0.0;
        Green = 0.0;
        Blue = 0.0;
    }
    float factor;

    if (Wavelength >= 380 && Wavelength <= 419) {
        factor = 0.3 + 0.7*(Wavelength - 380) / (420 - 380);
    } else if (Wavelength >= 420 && Wavelength <= 700) {
        factor = 1.0;
    } else if (Wavelength >= 701 && Wavelength <= 780) {
        factor = 0.3 + 0.7*(780 - Wavelength) / (780 - 700);
    } else {
        factor= 0.0;
    }
    float gamma = 0.80;
    float max=255;
    if(Red==0){R=0;} else{R=round(max*pow(Red * factor, gamma));}
    if(Green==0){G=0;} else{G=round(max*pow(Green * factor, gamma));}
    if(Blue==0){B=0;} else{B=round(max*pow(Blue * factor, gamma));}
    cout<<"R: "<<R<<"\nG: "<<G<<"\nB: "<<B<<endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}

premium na miecha, ktxhbye

Shaolineq OP · 10-06-2023 02:56

@niemoralny dzieki :)

moth Premium · 10-06-2023 11:10

Taidio · 10-06-2023 12:29

hello world

Lord Premium · 10-06-2023 18:40

rosen · 11-06-2023 05:51

tu w Python

Kod:

import math

Wavelength = float(input())

if Wavelength >= 380 and Wavelength <= 439:
    Red = -(Wavelength - 440) / (440 - 380)
    Green = 0.0
    Blue = 1.0
elif Wavelength >= 440 and Wavelength <= 489:
    Red = 0.0
    Green = (Wavelength - 440) / (490 - 440)
    Blue = 1.0
elif Wavelength >= 490 and Wavelength <= 509:
    Red = 0.0
    Green = 1.0
    Blue = -(Wavelength - 510) / (510 - 490)
elif Wavelength >= 510 and Wavelength <= 579:
    Red = (Wavelength - 510) / (580 - 510)
    Green = 1.0
    Blue = 0.0
elif Wavelength >= 580 and Wavelength <= 644:
    Red = 1.0
    Green = -(Wavelength - 645) / (645 - 580)
    Blue = 0.0
elif Wavelength >= 645 and Wavelength <= 780:
    Red = 1.0
    Green = 0.0
    Blue = 0.0
else:
    Red = 0.0
    Green = 0.0
    Blue = 0.0

if Wavelength >= 380 and Wavelength <= 419:
    factor = 0.3 + 0.7 * (Wavelength - 380) / (420 - 380)
elif Wavelength >= 420 and Wavelength <= 700:
    factor = 1.0
elif Wavelength >= 701 and Wavelength <= 780:
    factor = 0.3 + 0.7 * (780 - Wavelength) / (780 - 700)
else:
    factor = 0.0

gamma = 0.80
maximum = 255

R = 0 if Red == 0 else round(maximum * math.pow(Red * factor, gamma))
G = 0 if Green == 0 else round(maximum * math.pow(Green * factor, gamma))
B = 0 if Blue == 0 else round(maximum * math.pow(Blue * factor, gamma))

print(f"R: {R}\nG: {G}\nB: {B}")