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cylinder.cpp
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cylinder.cpp
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#ifndef _CYLINDER_CPP_
#define _CYLINDER_CPP_
#include <iostream>
using namespace std;
#include "cylinder.h"
#include "math.h"
GLint num_vertex = 40;
GLint num_vertex_head = 20;
#define PI 3.1416
/*
Z
|
7 +-------+ 6
/| /|
/ | / | ---> Y
4 +-------+5 |
| 3+----|--+ 2
| / | /
|/ |/
0 +-------+ 1
/
X
*/
void Cylinder::draw()
{
glPushMatrix();
glTranslatef(0.0,0.0,0.0);
glRotatef(180.0,1.0,0.0,0.0);
glScalef(0.5,0.5,1.0);
glPushMatrix();
// draw body (center cube)
drawBody();
glPopMatrix();
glPushMatrix();
glTranslatef(-0.25,0.5,1.2);
glRotatef(150,1.0,0.0,0.0);
glScalef(0.3,0.25,0.5);
//glTranslatef(0.5,0.0,0.0);
drawHead();
glPopMatrix();
}
//==================== 1. Immediate method ===================================
// immediate definition of individual vertex properties
void Cylinder::drawBody()
{
GLfloat vertex1[4];
GLfloat vertex2[4];
GLfloat vertex3[3];
GLfloat vertex4[3];
//GLfloat normal[3]; used for normal of each polygon
const GLfloat delta_angle = 2.0 * PI/num_vertex;
glEnable(GL_NORMALIZE);
glBegin(GL_TRIANGLE_FAN);
for(int i = 0;i < num_vertex;i++)
{
vertex1[0] = cos(delta_angle*i);
vertex1[1] = sin(delta_angle*i);
vertex1[2] = 1.0;
vertex1[3] = 1.0;
glNormal3f(vertex1[0],vertex1[1],vertex1[2]+0.5);
glVertex4fv(vertex1);
}
glEnd();
for(int i = 0;i < num_vertex;i++)
{
glBegin(GL_POLYGON);
vertex3[0] = cos(delta_angle*(i%num_vertex));
vertex3[1] = sin(delta_angle*(i%num_vertex));
vertex3[2] = 1.0;
vertex4[0] = cos(delta_angle*((i+1)%num_vertex));
vertex4[1] = sin(delta_angle*((i+1)%num_vertex));
vertex4[2] = 1.0;
/* normal to the whole polygon
if (vertex3[0] < vertex4[0])
normal[0] = vertex3[0]*2 + (vertex4[0]*2 - vertex3[0]*2) / 2;
else
normal[0] = vertex4[0]*2 + (vertex3[0]*2 - vertex4[0]*2) / 2;
if (vertex3[1] < vertex4[1])
normal[1] = vertex3[1]*2 + (vertex4[1]*2 - vertex3[1]*2) / 2;
else
normal[1] = vertex4[1]*2 + (vertex3[1]*2 - vertex4[0]*2) / 2;
normal[2] = 0.0;
glNormal3fv(normal);
*/
glNormal3fv(vertex3);
glVertex3fv(vertex3);
vertex3[2] = - 1.0;
glNormal3fv(vertex3);
glVertex3fv(vertex3);
glNormal3fv(vertex4);
glVertex3fv(vertex4);
vertex4[2] = - 1.0;
glNormal3fv(vertex4);
glVertex3fv(vertex4);
glEnd();
}
glBegin(GL_TRIANGLE_FAN);
for(int i = 0;i < num_vertex;i++)
{
vertex2[0] = cos(delta_angle*i);
vertex2[1] = sin(delta_angle*i);
vertex2[2] = - 1.0;
vertex2[3] = 1.0;
glNormal3f(vertex2[0],vertex2[1],vertex2[2] - 0.5);
glVertex4fv(vertex2);
}
glEnd();
for(int i = 0;i < num_vertex;i++)
{
glBegin(GL_POLYGON);
vertex3[0] = cos(delta_angle*(i%num_vertex));
vertex3[1] = sin(delta_angle*(i%num_vertex));
vertex3[2] = - 1.0;
vertex4[0] = cos(delta_angle*((i+1)%num_vertex));
vertex4[1] = sin(delta_angle*((i+1)%num_vertex));
vertex4[2] = - 1.0;
/* normal to the whole polygon
if (vertex3[0] < vertex4[0])
normal[0] = vertex3[0]*2 + (vertex4[0]*2 - vertex3[0]*2) / 2;
else
normal[0] = vertex4[0]*2 + (vertex3[0]*2 - vertex4[0]*2) / 2;
if (vertex3[1] < vertex4[1])
normal[1] = vertex3[1]*2 + (vertex4[1]*2 - vertex3[1]*2) / 2;
else
normal[1] = vertex4[1]*2 + (vertex3[1]*2 - vertex4[0]*2) / 2;
normal[2] = 0.0;
glNormal3fv(normal);
*/
glNormal3fv(vertex3);
glVertex3fv(vertex3);
vertex3[2] = 1.0;
glNormal3fv(vertex3);
glVertex3fv(vertex3);
glNormal3fv(vertex4);
glVertex3fv(vertex4);
vertex4[2] = 1.0;
glNormal3fv(vertex4);
glVertex3fv(vertex4);
glEnd();
}
}
void Cylinder::drawHead()
{
GLfloat vertex1[4];
GLfloat vertex2[4];
GLfloat vertex3[3];
GLfloat vertex4[3];
//GLfloat normal[3]; used for normal of each polygon
const GLfloat delta_angle = 2.0 * PI/num_vertex_head;
glEnable(GL_NORMALIZE);
glBegin(GL_TRIANGLE_FAN);
for(int i = 0;i < num_vertex_head;i++)
{
vertex1[0] = cos(delta_angle*i);
vertex1[1] = sin(delta_angle*i);
vertex3[2] = 1.0;
vertex1[3] = 1.0;
glNormal3f(vertex1[0],vertex1[1],vertex1[2]+0.5);
glVertex4fv(vertex1);
}
glEnd();
for(int i = 0;i < num_vertex_head;i++)
{
glBegin(GL_POLYGON);
vertex3[0] = cos(delta_angle*(i%num_vertex_head));
vertex3[1] = sin(delta_angle*(i%num_vertex_head));
vertex3[2] = 1.0;
vertex4[0] = cos(delta_angle*((i+1)%num_vertex_head));
vertex4[1] = sin(delta_angle*((i+1)%num_vertex_head));
vertex4[2] = 1.0;
glNormal3fv(vertex3);
glVertex3fv(vertex3);
vertex3[2] = - 1.0;
glNormal3fv(vertex3);
glVertex3fv(vertex3);
glNormal3fv(vertex4);
glVertex3fv(vertex4);
vertex4[2] = - 1.0;
glNormal3fv(vertex4);
glVertex3fv(vertex4);
glEnd();
}
glBegin(GL_TRIANGLE_FAN);
for(int i = 0;i < num_vertex_head;i++)
{
vertex2[0] = cos(delta_angle*i);
vertex2[1] = sin(delta_angle*i);
vertex2[2] = - 1.0;
vertex2[3] = 1.0;
glNormal3f(vertex2[0],vertex2[1],vertex2[2] - 0.5);
glVertex4fv(vertex2);
}
glEnd();
for(int i = 0;i < num_vertex_head;i++)
{
glBegin(GL_POLYGON);
vertex3[0] = cos(delta_angle*(i%num_vertex_head));
vertex3[1] = sin(delta_angle*(i%num_vertex_head));
vertex3[2] = - 1.0;
vertex4[0] = cos(delta_angle*((i+1)%num_vertex_head));
vertex4[1] = sin(delta_angle*((i+1)%num_vertex_head));
vertex4[2] = - 1.0;
glNormal3fv(vertex3);
glVertex3fv(vertex3);
vertex3[2] = 1.0;
glNormal3fv(vertex3);
glVertex3fv(vertex3);
glNormal3fv(vertex4);
glVertex3fv(vertex4);
vertex4[2] = 1.0;
glNormal3fv(vertex4);
glVertex3fv(vertex4);
glEnd();
}
}
#endif