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#pragma comment(linker, "/SUBSYSTEM:WINDOWS /ENTRY:mainCRTStartup")
#include <GL/freeglut/freeglut.h>
#include <math.h>
#define WIDTH 320
#define HEIGHT 240
//回転用
float anglex = 0.0f;
//青
GLfloat Blue[] = { 0.0, 0.0, 1.0, 1.0 };
//ライトの位置
GLfloat lightpos[] = { 200.0, 150.0, -500.0, 1.0 };
//円柱
void cylinder(float radius,float height,int sides)
{
double pi = 3.1415;
//上面
glNormal3d(0.0, 1.0, 0.0);
glBegin(GL_POLYGON);
for(double i = 0; i < sides; i++) {
double t = pi*2/sides * (double)i;
glVertex3d(radius * cos(t), height, radius * sin(t));
}
glEnd();
//側面
glBegin(GL_QUAD_STRIP);
for(double i=0;i<=sides;i=i+1){
double t = i*2*pi/sides;
glNormal3f((GLfloat)cos(t),0.0,(GLfloat)sin(t));
glVertex3f((GLfloat)(radius*cos(t)),-height,(GLfloat)(radius*sin(t)));
glVertex3f((GLfloat)(radius*cos(t)),height,(GLfloat)(radius*sin(t)));
}
glEnd();
//下面
glNormal3d(0.0, -1.0, 0.0);
glBegin(GL_POLYGON);
for(double i = sides; i >= 0; --i) {
double t = pi*2/sides * (double)i;
glVertex3d(radius * cos(t), -height, radius * sin(t));
}
glEnd();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport(0, 0, WIDTH, HEIGHT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//視野角,アスペクト比(ウィンドウの幅/高さ),描画する範囲(最も近い距離,最も遠い距離)
gluPerspective(30.0, (double)WIDTH / (double)HEIGHT, 1.0, 1000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
//視点の設定
gluLookAt(150.0,100.0,-200.0, //カメラの座標
0.0,0.0,0.0, // 注視点の座標
0.0,1.0,0.0); // 画面の上方向を指すベクトル
//ライトの設定
glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
//マテリアルの設定
glMaterialfv(GL_FRONT, GL_DIFFUSE, Blue);
//回転
glRotatef(anglex,1.0f,0.0f,0.0f);//X軸を回転
cylinder(30.0,50.0,10);
glutSwapBuffers();
}
void idle(void)
{
anglex+=0.2f;
Sleep(1);
glutPostRedisplay();
}
void Init(){
glClearColor(0.3f, 0.3f, 0.3f, 1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
}
int main(int argc, char *argv[])
{
glutInitWindowPosition(100, 100);
glutInitWindowSize(WIDTH, HEIGHT);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
glutCreateWindow("円柱を描画");
glutDisplayFunc(display);
glutIdleFunc(idle);
Init();
glutMainLoop();
return 0;
}
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