Cylinder.cpp

#include "Cylinder.h"
#include <math.h>

Cylinder::Cylinder(int slices, int stacks, bool smooth) {

	this->slices = slices;
	this->stacks = stacks;
	this->smooth = smooth;
}


void Cylinder::draw()
{
	long float pi = acos(-1.0);
	long float angulo = 360.0/ slices;
	float ki,kf;

	//Base z-
	glPushMatrix();
		glTranslatef(0,0,-0.5);
		glRotated(180,1,0,0);
			glBegin(GL_POLYGON);
				for(int i = 0; i < slices; ++i) {
					glNormal3f(0,0,1);
					glTexCoord2f((cos(angulo*(i)*pi/180)+1)/2,(sin(angulo*(i)*pi/180)+1)/2);
					glVertex3f(cos(angulo*(i)*pi/180),sin(angulo*(i)*pi/180),0);
				}
			glEnd();
	glPopMatrix();

	glPushMatrix();
		glTranslatef(0,0,-0.5);
		glBegin(GL_QUADS);
			for(int i = 0; i < slices; i++) {
				ki=0.0;
				kf=1.0/(float)stacks;
				for(int j=0; j < stacks; j++){
					if(!smooth)
						glNormal3f((cos(angulo*(i)*pi/180)+cos(angulo*(i+1)*pi/180))/2.0,(sin(angulo*(i)*pi/180)+sin(angulo*(i+1)*pi/180))/2.0,0);
					if(smooth)
						glNormal3f(cos(angulo*(i)*pi/180),sin(angulo*(i)*pi/180),0);
						glTexCoord2f(cos(angulo*(i)*pi/180), ki);
						glVertex3f(cos(angulo*(i)*pi/180),sin(angulo*(i)*pi/180),ki);
					if(smooth)
						glNormal3f(cos(angulo*(i+1)*pi/180),sin(angulo*(i+1)*pi/180),0);
						glTexCoord2f(cos(angulo*(i+1)*pi/180), ki);
					glVertex3f(cos(angulo*(i+1)*pi/180),sin(angulo*(i+1)*pi/180),ki);

					if(smooth)
						glNormal3f(cos(angulo*(i+1)*pi/180),sin(angulo*(i+1)*pi/180),0);
						glTexCoord2f(cos(angulo*(i+1)*pi/180), kf);
						glVertex3f(cos(angulo*(i+1)*pi/180),sin(angulo*(i+1)*pi/180),kf);

					if(smooth)
						glNormal3f(cos(angulo*(i)*pi/180),sin(angulo*(i)*pi/180),0);
						glTexCoord2f(cos(angulo*(i)*pi/180), kf);
						glVertex3f(cos(angulo*(i)*pi/180),sin(angulo*(i)*pi/180),kf);
					ki=kf;
					kf+=1.0/(float)stacks;
				}
			}
		glEnd();
	glPopMatrix();

	//Base z+
	glPushMatrix();
		glTranslatef(0,0,0.5);
		glBegin(GL_POLYGON);
			for(int i = 0; i < slices; ++i) {
				glNormal3f(0,0,1);
					glTexCoord2f((cos(angulo*(i)*pi/180)+1.0)/2.0,(sin(angulo*(i)*pi/180)+1.0)/2.0);
					glVertex3f(cos(angulo*(i)*pi/180),sin(angulo*(i)*pi/180),0);
			}
		glEnd();
	glPopMatrix();
}