void update(int t) {
if (currentCamera == 0) {
cameraAngle += (diffMouseDownX / 100.0);
cameraDistance = (cameraDistance += (diffMouseDownY / 20.0)) < 10 ? 10 : cameraDistance;
camera.set(
cameraDistance * cos(cameraAngle * (M_PI / 180)),
cameraElevation,
cameraDistance * sin(cameraAngle * (M_PI / 180))
);
cameraLookAt = Vector3();
cameraUp = Vector3(0, 1, 0);
}
else if (currentCamera == 1) {
aboveCamera.y = (std::max(50.0, aboveCamera.y + (diffMouseDownY / 100.0)));
aboveCameraLookAt = Vector3(0, aboveCamera.y - 100, aboveCamera.z);
cameraLookAt = aboveCameraLookAt;
camera.set(aboveCamera.x, aboveCamera.y, aboveCamera.z);
cameraUp = aboveCameraUp;
}
else if (currentCamera == 2) {
frontCamera.y = (frontCamera.y + (diffMouseDownY / 100.0));
frontCamera.x = (frontCamera.x - (diffMouseDownX / 100.0));
frontCamera.z = (cameraDistance);
frontCameraLookAt = frontCamera.add(Vector3(0.0, 0.0, -1.0));
cameraLookAt = frontCameraLookAt;
camera.set(frontCamera.x, frontCamera.y, frontCamera.z);
cameraUp = frontCameraUp;
}
else if (currentCamera == 3) {
getFreeCameraLookAt();
cameraLookAt = freeCameraLookAt;
camera.set(freeCamera.x, freeCamera.y, freeCamera.z);
freeCameraUp.x = sin(upAngle * (M_PI / 180));
freeCameraUp.y = cos(upAngle * (M_PI / 180));
cameraUp = freeCameraUp;
}
else if (currentCamera >= 4) {
updateFlyBy();
cameraLookAt = flyBySettings.lookAt;
camera.set(
flyBySettings.position.x,
flyBySettings.position.y,
flyBySettings.position.z
);
cameraUp = flyBySettings.up;
}
gravity.y = gravityIntensity;
particleSystem.applyForce(gravity);
for (int i = 0; i < 9; i++) {
if (gravitationalForce[i].type != GRAVITATIONALFORCETYPE_NONE) {
particleSystem.applyGravitationalForce(gravitationalForce[i]);
}
}
if (cycleColours) {
colourSwitch--;
if (colourSwitch == 0) {
colourSwitch = 10;
Particle::startColour = emitColours[initialColour];
currentColour = Particle::startColour;
initialColour = (++initialColour) == colourCount ? 0 : initialColour;
}
else {
Particle::startColour.r = linearEase(10 - colourSwitch, currentColour.r, emitColours[initialColour].r - currentColour.r, 10);
Particle::startColour.g = linearEase(10 - colourSwitch, currentColour.g, emitColours[initialColour].g - currentColour.g, 10);
Particle::startColour.b = linearEase(10 - colourSwitch, currentColour.b, emitColours[initialColour].b - currentColour.b, 10);
}
}
particleSystem.update();
// FPS monitoring
frame++;
elapsedTime = glutGet(GLUT_ELAPSED_TIME);
if (elapsedTime - timebase > 1000) {
fps = frame * 1000.0 / (elapsedTime - timebase);
timebase = elapsedTime;
frame = 0;
}
glutPostRedisplay();
glutTimerFunc(30, update, 0);
}
