Parameterizable Rectangle Fitter for openFrameworks

ofxRectFit.h

//
//  ofxRectFit.h
//
//  Created by Tiago on 11/28/14.
//
//

#ifndef __ofxRectFit__
#define __ofxRectFit__

#include "ofMain.h"


inline ofRectangle ofxRectFit(const ofRectangle& original,
                       const ofRectangle& container,
                       float fit,
                       float x, float y, bool inside) {
    float original_ratio = original.width/original.height;
    float container_ratio = container.width/container.height;
    
    ofRectangle mapped(original), fitted;
    if((container_ratio < original_ratio) ^ inside ) {
        fitted.height = container.height;
        fitted.width = container.height*original_ratio;
        
    } else {
        fitted.width = container.width;
        fitted.height = container.width/original_ratio;
    }
    fitted.x = ofMap(x, 0, 1, container.x, container.x + container.width - (fitted.width));
    fitted.y = ofMap(y, 0, 1, container.y, container.y + container.height - (fitted.height));
    mapped.x = ofMap(x, 0, 1, container.x, container.x + container.width - mapped.width);
    mapped.y = ofMap(y, 0, 1, container.y, container.y + container.height - mapped.height);
    
    return ofRectangle(
        ofMap(fit, 0, 1, mapped.x, fitted.x),
        ofMap(fit, 0, 1, mapped.y, fitted.y),
        ofMap(fit, 0, 1, mapped.width, fitted.width),
        ofMap(fit, 0, 1, mapped.height, fitted.height)
    );
}


#endif /* defined(__ofxRectFit__) */