openGL入门小程序

Posted 2022-11-24 小菜鸟yjm

#include	<stdlib.h>
#include    <stdio.h>
#include	<GL/glut.h>
GLdouble	angle = 0.0;
GLdouble	translation = 0.0;
GLdouble	scale = 1.0;

void init(void) 

	glClearColor(1.0,1.0,1.0,1.0);//设置清屏颜色，1,1,1，白色
	//glClear(GL_COLOR_BUFFER_BIT);清屏
	//指定着色模型
	glShadeModel(GL_FLAT);//单调着色
	glColor3f(0.0,0.0,0.0);//黑色
	


void keyboard(unsigned char key, int x, int y)

	if(key==27)
		exit(0);


void display(void)

	glClear(GL_COLOR_BUFFER_BIT); //清除颜色缓存
	glColor3f(0.0,0.0,0.0); //指定颜色
	//模型变换
	//指定模型
	//glTranslatef(0.01f,0.0f,0.0f);//设定坐标原点
	glRotatef(45,0.0f,0.0f,1.0f);
	glBegin(GL_TRIANGLES);
	glVertex3f( 0.0f, 1.0f, 0.0f);// 上顶点
	glVertex3f(-1.0f,-1.0f, 0.0f);// 左下
	glVertex3f( 1.0f,-1.0f, 0.0f);// 右下
	glEnd();// 三角形绘制结束
	glFlush();//马上执行
	printf("display invoke!\\n");
	//glTranslatef(0.3f, 0.0f, 0.0f);


void mouseFunc(int button, int state, int x, int y)

	if(button == GLUT_LEFT_BUTTON && state==GLUT_DOWN)//点击左键，并处于按下状态
	
		/*
		glMatrixMode(GL_MODELVIEW);
		glLoadIdentity();
		glRotatef(x,0,0,1);
		glRotatef(y,1,0,0);
		*/
		//glTranslatef(300.0f,0.0f,0.0f);// 右移3单位
		//glLoadIdentity();//复位键，使坐标回到初始状态
		//glTranslatef(0.3f, 0.0f, 0.0f);//为什么在这个里面就不能执行?
		glutPostRedisplay();//申请重绘当前窗口
		glutDisplayFunc(display); 
		glRotatef(45,0.0f,0.0f,1.0f);
		printf("left click!\\n");
	



void reshape (int w, int h)

	glViewport(0,0,(GLsizei)w,(GLsizei)h);


int main(int argc, char** argv)

	glutInit(&argc, argv);
	glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize (500, 500); 
	glutInitWindowPosition (100, 100);
	glutCreateWindow("OpenGL中的建模与变换");
	init();
	glutDisplayFunc(display); 
	glutReshapeFunc(reshape);
	glutKeyboardFunc(keyboard);
	glutMouseFunc(mouseFunc);
	glutMainLoop();
	return 0;

开始的话gult库中的各种函数可能对于初学者不太熟悉，请百度自行解决。这里必须调用glutPostRedisplay();申请重绘当前窗口，才能再次使回调函数触发，然后通过glRotatef(45,0.0f,0.0f,1.0f);实现旋转。