OpenGL路（四）自制的图形功能（立方体、汽缸、圆锥）-白红宇

OpenGL路（四）自制的图形功能（立方体、汽缸、圆锥）

阅读量：7011 次

发布时间：2019-06-28

本文共 2971 字，大约阅读时间需要 9 分钟。

#include 
     
      #include 
      
       #include 
       
        #pragma comment(lib, "opengl32.lib")#pragma comment(lib, "glut32.lib")#pragma comment(lib, "glu32.lib")#pragma comment(lib, "glut.lib")#include 
        
         void Cube(){	glBegin(GL_QUAD_STRIP);//填充凸多边形	glVertex3f(0.0f, 0.0f, 0.0f);	glVertex3f(0.0f, 1.0f, 0.0f);	glVertex3f(1.0f, 0.0f, 0.0f);	glVertex3f(1.0f, 1.0f, 0.0f);	glVertex3f(1.0f, 0.0f, -1.0f);	glVertex3f(1.0f, 1.0f, -1.0f);	glVertex3f(0.0f, 0.0f, -1.0f);	glVertex3f(0.0f, 1.0f, -1.0f);	glVertex3f(0.0f, 0.0f, 0.0f);	glVertex3f(0.0f, 1.0f, 0.0f);	glEnd();	glBegin(GL_QUAD_STRIP);	glVertex3f(0.0f, 0.0f, 0.0f);	glVertex3f(1.0f, 0.0f, 0.0f);	glVertex3f(0.0f, 0.0f, -1.0f);		glVertex3f(1.0f, 0.0f, -1.0f);	glVertex3f(0.0f, 1.0f, 0.0f);	glVertex3f(1.0f, 1.0f, 0.0f);	glVertex3f(0.0f, 1.0f, -1.0f);	glVertex3f(1.0f, 1.0f, -1.0f);	glEnd();}void Circle(){	glBegin(GL_TRIANGLE_FAN);//扇形连续填充三角形串	glVertex3f(0.0f, 0.0f, 0.0f);	int i = 0;	for (i = 0; i <= 390; i += 15)	{		float p = i * 3.14 / 180;		glVertex3f(sin(p), cos(p), 0.0f);	}	glEnd();}void Cylinder(){	glBegin(GL_QUAD_STRIP);//连续填充四边形串	int i = 0;	for (i = 0; i <= 390; i += 15)	{		float p = i * 3.14 / 180;		glVertex3f(sin(p), cos(p), 1.0f);		glVertex3f(sin(p), cos(p), 0.0f);	}	glEnd();	Circle();	glTranslatef(0, 0, 1);	Circle();}void Cone(){	glBegin(GL_QUAD_STRIP);//连续填充四边形串	int i = 0;	for (i = 0; i <= 390; i += 15)	{		float p = i * 3.14 / 180;		glVertex3f(0, 0, 1.0f);		glVertex3f(sin(p), cos(p), 0.0f);	}	glEnd();	Circle();}void renderScene(void){	static float i = 0;	i += 0.1;	if (i > 360)		i = 0;	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	glLoadIdentity();		glPushMatrix();	glColor3f(0, 1, 0);	glTranslatef(-2, 2.0, -12);	glRotatef(i, 1, 1 ,1);	Cylinder();	glPopMatrix();	glPushMatrix();	glColor3f(1, 0, 0);	glTranslatef(2, 2, -12);	glRotatef(i, 1, 1, 1);	Circle();	glPopMatrix();	glPushMatrix();	glColor3f(0, 1, 1);	glTranslatef(-2, -2, -12);	glRotatef(i, 1, 1, 1);	Cube();	glPopMatrix();	glPushMatrix();	glColor3f(1, 1, 0);	glTranslatef(2, -2, -12);	glRotatef(i, 1, 1, 1);	Cone();	glPopMatrix();	glutSwapBuffers();}void changeSize(int w, int h) {	// 防止除数即高度为0	// (你能够设置窗体宽度为0).	if (h == 0)		h = 1;	float ratio = 1.0* w / h;	// 单位化投影矩阵。

glMatrixMode(GL_PROJECTION); glLoadIdentity(); // 设置视口大小为整个窗体大小 glViewport(0, 0, w, h); // 设置正确的投影矩阵 gluPerspective(45, ratio, 1, 1000); //以下是设置模型视图矩阵 glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, -1.0, 0.0f, 1.0f, 0.0f);//设置观測点 } int main(int argc, char * argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); glutInitWindowPosition(100, 100); glutInitWindowSize(320, 320); glutCreateWindow("Hello OpenGL"); glutDisplayFunc(renderScene); glutIdleFunc(renderScene); //指定程序空暇时调用函数 glutReshapeFunc(changeSize); //指定窗体形状变化时的回调函数 glEnable(GL_DEPTH_TEST); glutMainLoop(); return 0; }

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