Openframeworks Line Equation class

gistfile1.cpp

class LineEquation {
public:
	
	float m;
	float c;
	
	void setFrom2Points(ofVec2f a, ofVec2f b) {
		ofVec2f g = b - a;
		float m = g.y / g.x;
		
		// y = mx + c		
		// so c = y - mx
		float c = a.y - m*a.x;
		

		set(m, c);
	}
	
	
	void set(float m, float c) {
		this->m = m;
		this->c = c;
	}
	
	float getY(float x) {
		return m*x + c;
	}
	
	float getX(float y) {
		return (y-c)/m;
	}
};