Color

The guikit::Color class is a utility class that can be used as helper to set colors. the color is stored as a single uint32_t ( 32 bit unsigned integer )

This doc assumes using namespace guikit is set and #include <guikit/color.hpp> is included. Otherwise, use guikit::Color instead of Color.

Constructors

By listing individual color components

     // red      // green   // blue    // opacity
Color(uint8_t r, uint8_t g, uint8_t b, uint8_t a);

Example:

// Bright red
Color(255,0,0,255);

By using single hexadecimal literal to specify the color

Color(uint32_t color);

// Bright Red
Color(0xFF0000FF);

Available methods

`set()`

change the values of the color object.

Color& set(uint8_t r, uint8_t g, uint8_t b, uint8_t a);

Example:

// Changing red to green
Color(255,0,0,255).set(0,255,0,255);

`setR(uint8_t r)`

set the red component of the color object

Color& setR(uint8_t r);

Example:

Color(0,0,0,255).setR(255);

`setG(uint8_t g)`

set the green component of the color object

Color& setG(uint8_t g);

Example:

Color(0,0,0,255).setG(255);

`setB(uint8_t b)`

set the blue component of the color object

Color& setB(uint8_t b);

Example:

Color(0,0,0,255).setB(255);

`setA(uint8_t a)`

set the alpha (opacity) component of the color object

Color& setA(uint8_t a);

Example:

Color(0,0,0,255).setA(128);

`getR()`

get the red component of the color object

uint8_t getR();

Example:

uint8_t r = Color(255,0,0,255).getR();

`getG()`

get the green component of the color object

uint8_t getG();

Example:

uint8_t g = Color(0,255,0,255).getG();

`getB()`

get the blue component of the color object

uint8_t getB();

Example:

uint8_t b = Color(0,0,255,255).getB();

`getA()`

get the alpha (opacity) component of the color object

uint8_t getA();

Example:

uint8_t a = Color(0,0,0,128).getA();

Full Example

Here is a full example of how to use the Color class:

#include <guikit/color.hpp>
#include <iostream>

using namespace guikit;

int main() {
    // initialize using hex (opaque red)
    Color myColor(0xFF0000FF);

    // change value to semi-transparent purple using chaining
    myColor.setB(255).setA(128);

    // access components
    std::cout << "Red:   " << (int)myColor.getR() << std::endl;
    std::cout << "Green: " << (int)myColor.getG() << std::endl;
    std::cout << "Blue:  " << (int)myColor.getB() << std::endl;
    std::cout << "Alpha: " << (int)myColor.getA() << std::endl;

    // access raw color
    std::cout << "Raw value: 0x" << std::hex << myColor.color << std::endl;

    return 0;
}

Color

On this page