OpenGL【C++】台灯

cpp 复制代码
#include<gl/glut.h>
#include <math.h>

/**************************************/
/* 设置灯旋转角度初始值和一些所用参数   */
/**************************************/
static GLfloat yrot = -100.0;
static GLfloat zrot = 40.0;
const GLfloat PI = 3.1415926f;
const GLfloat R = 10.0f;


void init()
{
	glClearColor(0.0, 0.0, 0.0, 0.0);
	glShadeModel(GL_SMOOTH);

	/********************************************/
	/* 设置灯泡光源属性：环境光、镜面光、散色光   */
	/********************************************/
	GLfloat light_ambient[] = { 0.2, 0.2, 0.2, 1.0 };
	GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
	GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };

	glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
	glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
	glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);

	/***************************************************************/
	/* 设置灯泡光源(移动光源)属性：光锥切角、初始位置、聚光灯光线方向 */
	/***************************************************************/
	GLfloat light_position[] = { 13.0, -3.0, 0.0 };
	GLfloat spot_direction[] = { 0.0, -1.0, 0.0 };

	glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 40.0);

	glLightfv(GL_LIGHT0, GL_POSITION, light_position);

	glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spot_direction);

	/********************************************************/
	/* 设置固定光源(LIGHT1)属性：位置、环境光、镜面光、散色光 */
	/********************************************************/
	GLfloat light_position1[] = { 0.0, 20.0, 0.0, 1.0 };
	GLfloat light_ambient1[] = { 0.2, 0.2, 0.2, 1.0 };
	GLfloat light_specular1[] = { 0.1, 0.1, 0.1, 1.0 };
	GLfloat light_diffuse1[] = { 0.1, 0.1, 0.1, 1.0 };

	glLightfv(GL_LIGHT1, GL_POSITION, light_position1);
	glLightfv(GL_LIGHT1, GL_AMBIENT, light_ambient1);
	glLightfv(GL_LIGHT1, GL_SPECULAR, light_specular1);
	glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse1);

	/************************************************/
	/* 设置材料属性：环境光、镜面光、散色光、镜面指数 */
	/************************************************/
	GLfloat mat_ambient[] = { 0.2, 0.2, 0.2, 1.0 };
	GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
	GLfloat mat_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
	GLfloat mat_shininess[] = { 120.0 };

	glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mat_ambient);
	glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
	glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, mat_diffuse);
	glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat_shininess);

	/************************************/
	/* 调用glColorMaterial设置材料属性   */
	/* 设置材料属性为颜色追踪。          */
	/* 启用颜色追踪                     */
	/************************************/
	glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
	glEnable(GL_COLOR_MATERIAL);


	/********************************/
	/* 开启光源、移动光源、固定光源 */
	/* 开启深度测试、法向量单位化   */
	/********************************/
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);
	glEnable(GL_LIGHT1);
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_NORMALIZE);

}

void display()
{

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	GLUquadricObj* objCylinder = gluNewQuadric();

	//画台灯底座
	glPushMatrix();
	glColor3f(0.12549, 0.69804, 0.66667);

	//底座使用一个立方体
	/*glTranslated(0.0, -20.0, 10.0);
	glScalef(12.0, 1.0, 12);
	glutSolidCube(2.0);*/


	/*********************************************************/
	/* 为了使法向量更多，从而使光照效果更佳，                  */
	/* 下面使用7*7的小立方体，拼成一个大的立方体作为台灯底座   */
	/*********************************************************/
	glTranslated(0.0, -20.0, 0.0);
	/*for(int m=5; m>-2; m--){
		for(int n=-3; n<4; n++){
		glPushMatrix();
		glTranslated(3*n, 0.0, 3*m);
		glScalef(1.0, 0.5, 1.0);
		glutSolidCube(3);
		glPopMatrix();
		}
	}*/

	/* 使用200*200小立方体画台灯底座 */
	for (int m = 180; m > -20; m--) {
		for (int n = -100; n < 100; n++) {
			glPushMatrix();
			glTranslated(0.1 * n, 0.0, 0.1 * m);
			glScalef(1.0, 10.0, 1.0);
			glutSolidCube(0.1);
			glPopMatrix();
		}
	}
	glPopMatrix();


	/*************************************************/
	/* 画灯杆                                         */
	/* 使用gluCylinder画圆柱，圆柱初试状态沿着-Z轴方向 */
	/**************************************************/
	//灯杆第一段
	glPushMatrix();
	glColor3f(0.7333, 1.0, 1.0);
	glRotatef(90.0, 1.0, 0.0, 0.0);
	gluCylinder(objCylinder, 1.0, 1.0, 21.0, 100, 100);// baseRadius,topRadius, height, slices, stacks
	glPopMatrix();

	//灯杆第二段
	glPushMatrix();
	glRotatef(yrot, 0.0f, 1.0f, 0.0f);
	glRotatef(zrot, 0.0f, 0.0f, 1.0f);

	glColor3f(0.7333, 1.0, 1.0);
	glTranslatef(4.0, 6.93, 0.0);
	glRotatef(90.0, 1.0, 0.0, 0.0);
	glRotatef(-30.0, 0.0, 1.0, 0.0);
	gluCylinder(objCylinder, 1.0, 1.0, 8.0, 100, 100);// baseRadius,topRadius, height, slices, stacks
	glPopMatrix();

	//灯杆第三段
	glPushMatrix();
	glRotatef(yrot, 0.0f, 1.0f, 0.0f);
	glRotatef(zrot, 0.0f, 0.0f, 1.0f);

	glColor3f(0.7333, 1.0, 1.0);
	glTranslatef(4.0, 6.93, 0.0);
	glRotatef(90.0, 1.0, 0.0, 0.0);
	glRotatef(90.0, 0.0, 1.0, 0.0);
	gluCylinder(objCylinder, 1.0, 1.0, 10.0, 100, 100);// baseRadius,topRadius, height, slices, stacks
	glPopMatrix();

	//灯杆第四段	
	glPushMatrix();
	glRotatef(yrot, 0.0f, 1.0f, 0.0f);
	glRotatef(zrot, 0.0f, 0.0f, 1.0f);

	glColor3f(0.7333, 1.0, 1.0);
	glTranslatef(13, 7.23, 0.0);//6.93
	glRotatef(90.0, 1.0, 0.0, 0.0);
	gluCylinder(objCylinder, 1.0, 1.0, 5.3, 100, 100);// baseRadius,topRadius, height, slices, stacks
	glPopMatrix();

	//灯壳
	//画圆锥的面
	glPushMatrix();
	glRotatef(yrot, 0.0f, 1.0f, 0.0f);
	glRotatef(zrot, 0.0f, 0.0f, 1.0f);

	glColor3f(0.12549, 0.69804, 0.66667);
	glBegin(GL_TRIANGLE_FAN);
	glVertex3f(13.0f, 2.5f, 0.0f);
	for (GLfloat angle = 0; angle <= 2.0 * PI; angle += PI / 10.0f) {
		GLfloat x = 13 + R * sin(angle);
		GLfloat z = R * cos(angle);

		glVertex3f(x, -3.27, z);
	}
	glVertex3f(13.0f, -3.27, 10.0f);
	glEnd();
	glPopMatrix();

	//灯泡
	glPushMatrix();

	glRotatef(yrot, 0.0f, 1.0f, 0.0f);
	glRotatef(zrot, 0.0f, 0.0f, 1.0f);

	/***************************************************************/
	/* 设置灯泡光源(移动光源)属性：光锥切角、初始位置、聚光灯光线方向 */
	/***************************************************************/
	GLfloat light_position[] = { 13.0, -3.0, 0.0 };
	GLfloat spot_direction[] = { 0.0, -1.0, 0.0 };

	glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 40.0);

	glLightfv(GL_LIGHT0, GL_POSITION, light_position);

	glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spot_direction);

	glDisable(GL_LIGHTING);
	glColor3f(1.0, 0.6, 0.2);
	glTranslatef(13.0, -3.4, 0.0);
	glutSolidSphere(3.0, 100, 100);
	glEnable(GL_LIGHTING);

	glPopMatrix();

	glutSwapBuffers();
}

void changesize(int w, int h)
{
	GLfloat nRange = 40.0;

	if (h == 0)
		h = 1;

	glViewport(0.0, 0.0, (GLsizei)w, (GLsizei)h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	if (w <= h)
		glOrtho(-nRange, nRange, -nRange * h / w, nRange * h / w, -nRange, nRange);
	else
		glOrtho(-nRange * w / h, nRange * w / h, -nRange, nRange, -nRange, nRange);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	gluLookAt(5.0, 5.0, 10.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
}

void SpecialKeys(int key, int x, int y)
{
	if (key == GLUT_KEY_UP && zrot < 50.0)
		zrot += 5.0;

	if (key == GLUT_KEY_DOWN && zrot > -30.0)
		zrot -= 5.0;

	if (key == GLUT_KEY_LEFT)
		yrot -= 5.0f;

	if (key == GLUT_KEY_RIGHT)
		yrot += 5.0f;

	glutPostRedisplay();
}

int main(int argc, char** argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
	glutInitWindowSize(800, 600);
	glutInitWindowPosition(200, 20);
	glutCreateWindow("台灯");

	init();
	glutDisplayFunc(display);
	glutReshapeFunc(changesize);
	glutSpecialFunc(SpecialKeys);
	glutMainLoop();
	return 0;
}