void display()
{
glClearColor(0.0f,0.0f,0.0f,0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glMatrixMode(GL_MODELVIEW);
/** Todo: Create your own affine transformation matrix here*/
glLoadIdentity();
// rotation
glMultMatrixf(camera.rotate.m);
gluLookAt(camera.position.x, camera.position.y, camera.position.z,
camera.lookAt.x, camera.lookAt.y, camera.lookAt.z,
camera.up.x, camera.up.y, camera.up.z);
// world coordinate
glPushMatrix();
glBegin(GL_LINES);
// x axis
glColor3f(1.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(500.0, 0.0, 0.0);
// y axis
glColor3f(0.0, 1.0, 0.0);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 500.0, 0.0);
// z axis
glColor3f(0.0, 0.0, 1.0);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, 500.0);
glEnd();
glPopMatrix();
/** Todo: Draw Model (clipping and non-clipping version)*/
glPushMatrix();
//glScalef(model.scale.x, model.scale.y, model.scale.z);
//glTranslatef(model.translate.x, model.translate.y, model.translate.z);
glMultMatrixf(model.scale.m);
glMultMatrixf(model.translate.m);
glMultMatrixf(model.shear.m);
glMultMatrixf(model.rotate.m);
glGetFloatv(GL_MODELVIEW_MATRIX, mModelView.m);
model.drawAxes();
model.drawBox();
if(doClipping)
drawModelClipping();
else
model.drawModel();
glPopMatrix();
// clipping field
if(doClipping)
{
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glColor3f(1.0, 1.0, 0.0);
glBegin(GL_QUADS);
glVertex3f(2.0 * xMin / windowWidth, 2.0 * yMin / windowHeight, -1.0);
glVertex3f(2.0 * xMax / windowWidth, 2.0 * yMin / windowHeight, -1.0);
glVertex3f(2.0 * xMax / windowWidth, 2.0 * yMax / windowHeight, -1.0);
glVertex3f(2.0 * xMin / windowWidth, 2.0 * yMax / windowHeight, -1.0);
glEnd();
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
}
glutSwapBuffers();
}
