PolygonArc

PolygonArc.hpp

class PolygonArc
{
public:
	
	PolygonArc()
	{
		curveResolution = 4;
	}
	
	void draw()
	{
		
		glPushMatrix();
		
		angle = ofClamp(angle, -360, 360);
		
		const float res = curveResolution;
		const float d = res / angle * (fabs(angle) / 360.);
		const float step = fabs(angle / res);
		
		float phase = 0;
		
		glBegin(GL_TRIANGLE_STRIP);
		for (int i = 0; i <= step; i++)
		{
			float xx = cos(phase * TWO_PI);
			float yy = sin(phase * TWO_PI);
			
			glVertex3f(xx * inner, yy * inner, 0);
			glVertex3f(xx * outer, yy * outer, 0);
			
			phase += d;
		}
		glEnd();
		
		glPopMatrix();
	}
	
	float getInner() { return inner; }
	void setInner(float v)
	{
		inner = v;
	}
	
	float getOuter() { return outer; }
	void setOuter(float v)
	{
		outer = v;
	}
	
	float getAngle() { return angle; }
	void setAngle(float v)
	{
		angle = v;
	}

private:
	
	float inner, outer;
	float angle;
	float curveResolution;
};