void VectorHistogram::AddVectorInterpolated(float x, float y) {
// ensure angle \in (0, 1)
float bin = NormAngle(x, y) * num_bins_;
float magn = hypot(x, y);
float int_bin = floor(bin);
const float bin_center[3] = { int_bin - 1.0f + 0.5f,
int_bin + 0.5f,
int_bin + 1.0f + 0.5f
};
const int bin_idx[3] = { ((int)int_bin - 1 + num_bins_) % num_bins_,
(int)int_bin,
((int)int_bin + 1) % num_bins_
};
// Loop over.
for (int i = 0; i < 3; ++i) {
const float da = fabs(bin_center[i] - bin);
if (da < 1) {
bins_[bin_idx[i]] += (1 - da) * magn;
}
}
++num_vectors_;
}
float GetAngle(float x, float y)
{
if (fabs(x) < 1e-6f)
{
return y > 0 ? D3DX_PI / 2 : -D3DX_PI / 2;
}
float a = atanf(y / abs(x));
if (x < 0) a = D3DX_PI - a;
return NormAngle(a);
}
bool CObjectRotateCamera::Update()
{
CMouseManager* mouse = GetMouse();
bool down[2] = {mouse->IsPressed(0), mouse->IsPressed(1)};
int x = mouse->GetX();
int y = mouse->GetY();
int dx = x - m_lastx;
int dy = y - m_lasty;
bool needUpdate = false;
if (!GetKeyboard()->IsPressed(VK_SHIFT) && m_lastDown[0] && down[0] && (abs(dx) + abs(dy) > 0))
{
m_anglex += dx * 0.01f; // * elapsedTime;
m_anglez += dy * 0.01f;// * elapsedTime;
m_anglex = NormAngle(m_anglex);
m_anglez = NormAngle(m_anglez);
Point3 eye = Angle2Pos(m_anglex, m_anglez);
SetEye(eye.x, eye.y, eye.z);
needUpdate = true;
}
if (GetMouse()->GetWheel() != 0)
{
m_radius *= max(0.01f, 1 - GetMouse()->GetWheel() * 0.0003f);
Point3 eye = Angle2Pos(m_anglex, m_anglez);
SetEye(eye.x, eye.y, eye.z);
needUpdate = true;
}
m_lastDown[0] = down[0];
m_lastDown[1] = down[1];
m_lastx = x;
m_lasty = y;
return needUpdate;
}
void VectorHistogram::AddVector(float x, float y) {
bins_[NormAngle(x, y) * num_bins_] += hypot(x, y);
++num_vectors_;
}