void TQuadraticLengthEvaluator::setQuad(const TQuadratic &quad) {
const TPointD &p0 = quad.getP0();
const TPointD &p1 = quad.getP1();
const TPointD &p2 = quad.getP2();
TPointD speed0(2.0 * (p1 - p0));
TPointD accel(2.0 * (p2 - p1) - speed0);
double a = accel * accel;
double b = 2.0 * accel * speed0;
m_c = speed0 * speed0;
m_constantSpeed = isAlmostZero(a); // => b isAlmostZero, too
if (m_constantSpeed) {
m_c = sqrt(m_c);
return;
}
m_sqrt_a_div_2 = 0.5 * sqrt(a);
m_noSpeed0 = isAlmostZero(m_c); // => b isAlmostZero, too
if (m_noSpeed0) return;
m_tRef = 0.5 * b / a;
double d = m_c - 0.5 * b * m_tRef;
m_squareIntegrand = (d < TConsts::epsilon);
if (m_squareIntegrand) {
m_f = (b > 0) ? -sq(m_tRef) : sq(m_tRef);
return;
}
m_e = d / a;
double sqrt_part = sqrt(sq(m_tRef) + m_e);
double log_arg = m_tRef + sqrt_part;
m_squareIntegrand = (log_arg < TConsts::epsilon);
if (m_squareIntegrand) {
m_f = (b > 0) ? -sq(m_tRef) : sq(m_tRef);
return;
}
m_primitive_0 = m_sqrt_a_div_2 * (m_tRef * sqrt_part + m_e * log(log_arg));
}
void CUI::displayHUD(void)
{
width = (GLfloat)glutGet(GLUT_WINDOW_WIDTH);
height = (GLfloat)glutGet(GLUT_WINDOW_HEIGHT);
glEnable(GL_TEXTURE_2D);
if (data->drawHUD && data->gameState == PLAYING)
{
if (data->camera->speed >= 8.0f)
glBindTexture(GL_TEXTURE_2D, speed8());
else if (data->camera->speed >= 6.0f)
glBindTexture(GL_TEXTURE_2D, speed6());
else if (data->camera->speed >= 4.0f)
glBindTexture(GL_TEXTURE_2D, speed4());
else if (data->camera->speed >= 2.0f)
glBindTexture(GL_TEXTURE_2D, speed2());
else
glBindTexture(GL_TEXTURE_2D, speed0());
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2f(10, height-10);
glTexCoord2f(1, 0);
glVertex2f(40, height-10);
glTexCoord2f(1, 1);
glVertex2f(40, height-110);
glTexCoord2f(0, 1);
glVertex2f(10, height-110);
glEnd();
}
if (data->gameState == LOOSE)
{
glBindTexture(GL_TEXTURE_2D, loose());
glBegin(GL_QUADS);
glColor3f(1.0f, 1.0f, 1.0f);
glTexCoord2f(1, 1);
glVertex2f(0, 0);
glTexCoord2f(1, 0);
glVertex2f(0, height);
glTexCoord2f(0, 0);
glVertex2f(width, height);
glTexCoord2f(0, 1);
glVertex2f(width, 0);
glEnd();
}
if (data->gameState == WIN)
{
glBindTexture(GL_TEXTURE_2D, win());
glBegin(GL_QUADS);
glColor3f(1.0f, 1.0f, 1.0f);
glTexCoord2f(1, 1);
glVertex2f(0, 0);
glTexCoord2f(1, 0);
glVertex2f(0, height);
glTexCoord2f(0, 0);
glVertex2f(width, height);
glTexCoord2f(0, 1);
glVertex2f(width, 0);
glEnd();
}
glDisable(GL_TEXTURE_2D);
}
