void MouseMoveEvent(int x, int y)
{
if (isStartTrackBall)
{
GLfloat theta;
M3DVector3f p1, p2, n;
int width = glutGet(GLUT_WINDOW_WIDTH);
int height = glutGet(GLUT_WINDOW_HEIGHT);
MousePtToSphereVec(p1, mMouseX, mMouseY, width, height);
MousePtToSphereVec(p2, x, y, width, height);
mMouseX = x;
mMouseY = y;
m3dNormalizeVector3(p1);
m3dNormalizeVector3(p2);
theta = acos(m3dDotProduct3(p1, p2)) ;
//theta = m3dGetAngleBetweenVectors3(p1, p2);
m3dCrossProduct3(n, p1, p2);
m3dNormalizeVector3(n);
M3DMatrix44f tempRotation;
m3dLoadIdentity44(tempRotation);
GLfloat dis = m3dGetDistance3(p1, p2);
if (dis != 0.0f)
{
m3dRotationMatrix44(tempRotation, theta, m3dGetVectorX(n), m3dGetVectorY(n), m3dGetVectorZ(n));
}
m3dMatrixMultiply44(mRotation, tempRotation, mRotation);
glutPostRedisplay();
}
}
void Selection::draw_area()
{
int width = glutGet( GLUT_WINDOW_WIDTH ), height = glutGet( GLUT_WINDOW_HEIGHT );
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0, width, 0, height);
glMatrixMode( GL_MODELVIEW );
glPushMatrix();
glLoadIdentity();
/*** 画矩形 ***/
glColor4f(1.0, 1.0, 0, 0.2);
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glRectf( m3dGetVectorX(left_bottom), m3dGetVectorY(left_bottom), m3dGetVectorX(right_top), m3dGetVectorY(right_top));
/*** 画矩形虚线 ***/
glEnable( GL_LINE_STIPPLE );
glColor4f(1, 0, 0, 0.5);
glLineStipple(3, 0xAAAA);
glBegin( GL_LINE_LOOP );
glVertex2f(m3dGetVectorX(left_bottom), m3dGetVectorY(left_bottom));
glVertex2f(m3dGetVectorX(right_top), m3dGetVectorY(left_bottom));
glVertex2f(m3dGetVectorX(right_top), m3dGetVectorY(right_top));
glVertex2f(m3dGetVectorX(left_bottom), m3dGetVectorY(right_top));
glEnd();
glPopMatrix();
glPopMatrix();
glDisable( GL_LINE_STIPPLE );
glDisable( GL_BLEND );
}
