opengl实现太阳系天体运动(7)

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

if(xRot > 356.0f) xRot = 0.0f;

if(xRot < -1.0f) xRot = 355.0f;

if(yRot > 356.0f) yRot = 0.0f;

if(yRot < -1.0f) yRot = 355.0f;

// Refresh the Window

glutPostRedisplay();// this will refresh the window, so, it works the same to call RenderScene() directly }

void DrawAxis() {

//绘制x、y、z坐标轴 {

glColor3f( 0.0f, 0.0f, 1.0f );//指定线的颜色,蓝色

glBegin( GL_LINES ); {

// x-axis

glVertex3f( 0.0f, 0.0f, 0.0f); glVertex3f( 200.0f, 0.0f, 0.0f);

// x-axis arrow

glVertex3f( 200.0f, 0.0f, 0.0f); glVertex3f( 193.0f, 3.0f, 0.0f); glVertex3f( 200.0f, 0.0f, 0.0f); glVertex3f( 193.0f,-3.0f, 0.0f); } glEnd();

glColor3f( 0.0f, 1.0f, 0.0f );//指定线的颜色,绿色

glBegin( GL_LINES ); {

// y-axis

glVertex3f( 0.0f, 0.0f, 0.0f); glVertex3f( 0.0f, 200.0f, 0.0f); glVertex3f( 0.0f, 200.0f, 0.0f); glVertex3f( 3.0f, 193.0f, 0.0f); glVertex3f( 0.0f, 200.0f, 0.0f); glVertex3f( -3.0f, 193.0f, 0.0f);

} glEnd();

glColor3f( 1.0f, 0.0f, 0.0f );//指定线的颜色,红色

glBegin( GL_LINES ); {

// z-axis

glVertex3f( 0.0f, 0.0f, 0.0f ); glVertex3f( 0.0f, 0.0f, 200.0f ); glVertex3f( 0.0f, 0.0f, 200.0f ); glVertex3f( 0.0f, 3.0f, 193.0f ); glVertex3f( 0.0f, 0.0f, 200.0f ); glVertex3f( 0.0f, -3.0f, 193.0f); } glEnd(); } }

运行效果图：