void ResetCamera()
{
g_model.getCenter(g_targetPos[0], g_targetPos[1], g_targetPos[2]);
g_cameraPos[0] = g_targetPos[0];
g_cameraPos[1] = g_targetPos[1];
g_cameraPos[2] = g_targetPos[2] + g_model.getRadius() + CAMERA_ZNEAR + 0.4f;
g_pitch = 0.0f;
g_heading = 0.0f;
}
void ProcessMouseInput(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
// Use the left mouse button to track the camera.
// Use the middle mouse button to dolly the camera.
// Use the right mouse button to orbit the camera.
enum CameraMode {CAMERA_NONE, CAMERA_TRACK, CAMERA_DOLLY, CAMERA_ORBIT};
static CameraMode cameraMode = CAMERA_NONE;
static POINT ptMousePrev = {0};
static POINT ptMouseCurrent = {0};
static int mouseButtonsDown = 0;
static float dx = 0.0f;
static float dy = 0.0f;
switch (msg)
{
case WM_LBUTTONDOWN:
cameraMode = CAMERA_TRACK;
++mouseButtonsDown;
SetCapture(hWnd);
ptMousePrev.x = static_cast<int>(static_cast<short>(LOWORD(lParam)));
ptMousePrev.y = static_cast<int>(static_cast<short>(HIWORD(lParam)));
ClientToScreen(hWnd, &ptMousePrev);
break;
case WM_RBUTTONDOWN:
cameraMode = CAMERA_ORBIT;
++mouseButtonsDown;
SetCapture(hWnd);
ptMousePrev.x = static_cast<int>(static_cast<short>(LOWORD(lParam)));
ptMousePrev.y = static_cast<int>(static_cast<short>(HIWORD(lParam)));
ClientToScreen(hWnd, &ptMousePrev);
break;
case WM_MBUTTONDOWN:
cameraMode = CAMERA_DOLLY;
++mouseButtonsDown;
SetCapture(hWnd);
ptMousePrev.x = static_cast<int>(static_cast<short>(LOWORD(lParam)));
ptMousePrev.y = static_cast<int>(static_cast<short>(HIWORD(lParam)));
ClientToScreen(hWnd, &ptMousePrev);
break;
case WM_MOUSEMOVE:
ptMouseCurrent.x = static_cast<int>(static_cast<short>(LOWORD(lParam)));
ptMouseCurrent.y = static_cast<int>(static_cast<short>(HIWORD(lParam)));
ClientToScreen(hWnd, &ptMouseCurrent);
switch (cameraMode)
{
case CAMERA_TRACK:
dx = static_cast<float>(ptMouseCurrent.x - ptMousePrev.x);
dx *= MOUSE_TRACK_SPEED;
dy = static_cast<float>(ptMouseCurrent.y - ptMousePrev.y);
dy *= MOUSE_TRACK_SPEED;
g_cameraPos[0] -= dx;
g_cameraPos[1] += dy;
g_targetPos[0] -= dx;
g_targetPos[1] += dy;
break;
case CAMERA_DOLLY:
dy = static_cast<float>(ptMouseCurrent.y - ptMousePrev.y);
dy *= MOUSE_DOLLY_SPEED;
g_cameraPos[2] -= dy;
if (g_cameraPos[2] < g_model.getRadius() + CAMERA_ZNEAR)
g_cameraPos[2] = g_model.getRadius() + CAMERA_ZNEAR;
if (g_cameraPos[2] > CAMERA_ZFAR - g_model.getRadius())
g_cameraPos[2] = CAMERA_ZFAR - g_model.getRadius();
break;
case CAMERA_ORBIT:
dx = static_cast<float>(ptMouseCurrent.x - ptMousePrev.x);
dx *= MOUSE_ORBIT_SPEED;
dy = static_cast<float>(ptMouseCurrent.y - ptMousePrev.y);
dy *= MOUSE_ORBIT_SPEED;
g_heading += dx;
g_pitch += dy;
if (g_pitch > 90.0f)
g_pitch = 90.0f;
if (g_pitch < -90.0f)
g_pitch = -90.0f;
break;
}
ptMousePrev.x = ptMouseCurrent.x;
ptMousePrev.y = ptMouseCurrent.y;
break;
case WM_LBUTTONUP:
case WM_RBUTTONUP:
case WM_MBUTTONUP:
if (--mouseButtonsDown <= 0)
{
mouseButtonsDown = 0;
cameraMode = CAMERA_NONE;
ReleaseCapture();
}
else
{
if (wParam & MK_LBUTTON)
cameraMode = CAMERA_TRACK;
else if (wParam & MK_RBUTTON)
cameraMode = CAMERA_ORBIT;
else if (wParam & MK_MBUTTON)
cameraMode = CAMERA_DOLLY;
}
break;
default:
break;
}
}
