// this function update the interpolated position of the Camera
void UpdateCamera (dFloat interpolationParam)
{
dFloat rollAngle;
dFloat yawAngle;
yawAngle = gPrevYawAngle + (gYawAngle - gPrevYawAngle) * interpolationParam;
rollAngle = gPrevRollAngle + (gRollAngle - gPrevRollAngle) * interpolationParam;
dMatrix cameraDirMat (dRollMatrix(rollAngle) * dYawMatrix(yawAngle));
dVector eye (gPrevCameraEyepoint + (gCameraEyepoint - gPrevCameraEyepoint).Scale (interpolationParam));
dVector target (eye + cameraDirMat.m_front);
// set up the view orientation looking at the origin from slightly above
SetCamera (eye, target);
}
// This function read KeyBoard and Mouse control to control this scene
// The control are read at the simulation rate, and two states are kept
void InputControl(NewtonWorld* world)
{
// read the mouse position and set the camera direction
static dVector mouse0 (GetMousePos());
dVector mouse1 (GetMousePos());
gPrevYawAngle = gYawAngle;
gPrevRollAngle = gRollAngle;
if (!MousePick (world, mouse1)) {
int leftKetDown;
leftKetDown = IsKeyDown (KeyCode_L_BUTTON);
// we are not in mouse pick mode, then we are in camera tracking mode
if (leftKetDown) {
// when click left mouse button the first time, we reset the camera
// convert the mouse x position to delta yaw angle
if (mouse1.m_x > (mouse0.m_x + 1)) {
gYawAngle += 1.0f * 3.1416f / 180.0f;
if (gYawAngle > (360.0f * 3.1416f / 180.0f)) {
gYawAngle -= (360.0f * 3.1416f / 180.0f);
}
} else if (mouse1.m_x < (mouse0.m_x - 1)) {
gYawAngle -= 1.0f * 3.1416f / 180.0f;
if (gYawAngle < 0.0f) {
gYawAngle += (360.0f * 3.1416f / 180.0f);
}
}
if (mouse1.m_y > (mouse0.m_y + 1)) {
gRollAngle += 1.0f * 3.1416f / 180.0f;
if (gRollAngle > (80.0f * 3.1416f / 180.0f)) {
gRollAngle = 80.0f * 3.1416f / 180.0f;
}
} else if (mouse1.m_y < (mouse0.m_y - 1)) {
gRollAngle -= 1.0f * 3.1416f / 180.0f;
if (gRollAngle < -(80.0f * 3.1416f / 180.0f)) {
gRollAngle = -80.0f * 3.1416f / 180.0f;
}
}
dMatrix cameraDirMat (dRollMatrix(gRollAngle) * dYawMatrix(gYawAngle));
gCurrCameraDir = cameraDirMat.m_front;
}
}
// save mouse position and left mouse key state for next frame
mouse0 = mouse1;
// camera control
gPrevCameraEyepoint = gCameraEyepoint;
if (IsKeyDown ('W')) {
gCameraEyepoint += gCurrCameraDir.Scale (CAMERA_SPEED / 60.0f);
} else if (IsKeyDown ('S')) {
gCameraEyepoint -= gCurrCameraDir.Scale (CAMERA_SPEED / 60.0f);
}
if (IsKeyDown ('D')) {
dVector up (0.0f, 1.0f, 0.0f);
dVector right (gCurrCameraDir * up);
gCameraEyepoint += right.Scale (CAMERA_SPEED / 60.0f);
} else if (IsKeyDown ('A')) {
dVector up (0.0f, 1.0f, 0.0f);
dVector right (gCurrCameraDir * up);
gCameraEyepoint -= right.Scale (CAMERA_SPEED / 60.0f);
}
}
// Keyboard handler.
void Keyboard()
{
// check for termination
if (dGetKeyState (VK_ESCAPE) & 0x8000) {
exit(0);
}
// read the mouse position and set the camera direction
static MOUSE_POINT mouse0;
static dFloat yawAngle = 90.0f * 3.1416 / 180.0f;
static dFloat rollAngle = 0.0f;
MOUSE_POINT mouse1;
GetCursorPos(mouse1);
if (dGetKeyState (VK_LBUTTON) & 0x8000) {
if (mouse1.x > (mouse0.x + 1)) {
yawAngle += 1.0f * 3.1416 / 180.0f;
if (yawAngle > (360.0f * 3.1416 / 180.0f)) {
yawAngle -= (360.0f * 3.1416 / 180.0f);
}
} else if (mouse1.x < (mouse0.x - 1)) {
yawAngle -= 1.0f * 3.1416 / 180.0f;
if (yawAngle < 0.0f) {
yawAngle += (360.0f * 3.1416 / 180.0f);
}
}
if (mouse1.y > (mouse0.y + 1)) {
rollAngle += 1.0f * 3.1416 / 180.0f;
if (rollAngle > (80.0f * 3.1416 / 180.0f)) {
rollAngle = 80.0f * 3.1416 / 180.0f;
}
} else if (mouse1.y < (mouse0.y - 1)) {
rollAngle -= 1.0f * 3.1416 / 180.0f;
if (rollAngle < -(80.0f * 3.1416 / 180.0f)) {
rollAngle = -80.0f * 3.1416 / 180.0f;
}
}
dMatrix cameraDirMat (dgRollMatrix(rollAngle) * dgYawMatrix(yawAngle));
cameraDir = cameraDirMat.m_front;
}
mouse0 = mouse1;
// camera control
if (dGetKeyState ('W') & 0x8000) {
cameraEyepoint += cameraDir.Scale (CAMERA_SPEED / 60.0f);
} else if (dGetKeyState ('S') & 0x8000) {
cameraEyepoint -= cameraDir.Scale (CAMERA_SPEED / 60.0f);
}
if (dGetKeyState ('D') & 0x8000) {
dVector up (0.0f, 1.0f, 0.0f);
dVector right (cameraDir * up);
cameraEyepoint += right.Scale (CAMERA_SPEED / 60.0f);
} else if (dGetKeyState ('A') & 0x8000) {
dVector up (0.0f, 1.0f, 0.0f);
dVector right (cameraDir * up);
cameraEyepoint -= right.Scale (CAMERA_SPEED / 60.0f);
}
}
