color

feature requests
#1

can we add:

  
ofColor color;  
ofSetColor(color);
#2

I just wrote this for a project I’m working on. It’s backwards compatible with ofColor, but is a lot more powerful:

  • Static colorMode and colorRange to which everything is sensitive

  • Create as (float, float, float) or unsigned int/hex representation and export color asHex() in an unsigned int/hex representation (unlike Processing, either RGB or HSB)

  • red, green, blue, hue, saturation, brightness all stored publicly, allowing you to access and update them directly, and then call update() to sync the other model (or sync a specific model by passing an argument to update())

  • Distance between two colors in the current color model, or a specified model

  • <, ==, and > have been overridden to allow sorting functions to sort ofxColors about a single dimension specified by ofxColor::setColorSortMode()

  • ofxColor.ofSetColor(), as per Todd’s request :slight_smile:

If someone wants to add blending modes or other color models, that’d be awesome.

Here’s an overview:

  
  
#define OF_COLOR_RGB 0  
#define OF_COLOR_HSV 1  
  
#define OF_COLOR_SORT_RED 0  
#define OF_COLOR_SORT_GREEN 1  
#define OF_COLOR_SORT_BLUE 2  
#define OF_COLOR_SORT_HUE 3  
#define OF_COLOR_SORT_SATURATION 4  
#define OF_COLOR_SORT_VALUE 5  
#define OF_COLOR_SORT_ALPHA 6  
  
class ofxColor {  
public:  
	static void setColorMode(int colorMode);  
	static int getColorMode();  
	static void setColorRange(float colorRange);  
	static float getColorRange();  
	static void setColorSortMode(int colorSortMode);  
	static int getColorSortMode();  
  
	float  
		alpha,  
		red, green, blue,  
		hue, saturation, value;  
  
	ofxColor();  
	ofxColor(const ofxColor& x);  
	ofxColor(unsigned int asHex);  
	ofxColor(float x, float y, float z);  
	ofxColor& operator=(const ofxColor& x);  
	ofxColor operator+(const ofxColor& x) const;  
	int operator==(const ofxColor& x) const;  
	bool operator<(const ofxColor& x) const;  
	bool operator>(const ofxColor& x) const;  
	float distance(const ofxColor& x, int colorMode = ofxColor::colorMode) const;  
	unsigned int asHex(int colorMode = ofxColor::colorMode) const;  
	void update();  
	void clear();  
	void updateRgb();  
	void updateHsv();  
	void setColor() const;  
	virtual ~ofxColor();  
private:  
	static int colorMode;  
	static float colorRange;  
	static int colorSortMode;  
};  
  
void ofSetColor(const ofxColor& color);

ofxColor.zip

ofxColor.zip

Brightness
#3

I just uploaded a new version that uses the name “HSV” instead of “HSB”. Though HSB is used in Processing, HSV is used many other places (like OpenCV).

I also fixed some consts that didn’t quite make sense and added the global function:

  
  
void ofSetColor(const ofxColor& color);
#4

could you post an example of how to use your class? thanks!

#5

Sure, download r2 first (just posted above). There was a bug in how colors were drawn when you called ofSetColor(color) if you had some non-255 color range.

Here’s a demo that displays some randomly generated + sorted colors:

  
  
#pragma once  
  
#include "ofMain.h"  
#include "ofxColor.h"  
  
class testApp : public ofBaseApp {  
public:  
	static const int  
		xSize = 4,  
		ySize = 4;  
	int cols,	rows;  
  
	vector<ofxColor> colors;  
  
	testApp() {}  
  
	void setup() {  
		cols = ofGetWidth() / xSize;  
		rows = ofGetHeight() / ySize;  
  
		ofxColor::setColorRange(1);  
		ofxColor::setColorSortMode(OF_COLOR_SORT_VALUE);  
	}  
  
	void update() {  
		colors.clear();  
  
		// make a list of random colors  
		for(int y = 0; y < rows; y++) {  
			for(int x = 0; x < cols; x++) {  
				colors.push_back(  
					ofxColor(  
						ofRandomuf(),  
						ofRandomuf(),  
						ofRandomuf()));  
			}  
		}  
  
		// sort the colors by value  
		std::sort(colors.begin(), colors.end());  
	}  
  
	void draw() {  
		int i = 0;  
		for(int y = 0; y < rows; y++) {  
			for(int x = 0; x < cols; x++) {  
				ofSetColor(colors[i++]);  
				ofRect(x * xSize, y * ySize, xSize, ySize);  
			}  
		}  
	}  
};

#6

thanks! thats very helpful!