Camera.cpp

#include "Camera.h"
#include "imgui-1.88/imgui.h"

DirectX::XMMATRIX Camera::GetMatrix() const noexcept {
	// The camera position
	const auto pos = DirectX::XMVector3Transform(
		// r away from the origin
		DirectX::XMVectorSet(0.0, 0.0, -r, 0.0f),
		// Movement around the origin
		DirectX::XMMatrixRotationRollPitchYaw(phi, -theta, 0.0f)
	);

	return DirectX::XMMatrixLookAtLH(
		// Points the camera towards the origin
		pos, DirectX::XMVectorZero(),
		DirectX::XMVectorSet(0.0f, 1.0f, 0.0f, 0.0f)
		// Custom Rotation added on top
	) * DirectX::XMMatrixRotationRollPitchYaw(
		pitch, -yaw, roll
	);
}

void Camera::SpawnControlWindow() noexcept {
	if (ImGui::Begin("Camera")) {
		ImGui::Text("Position");
		ImGui::SliderFloat("R", &r, 0.0f, 80.0f, "%.1f");
		ImGui::SliderAngle("Theta", &theta, -180.0f, 180.0f);
		ImGui::SliderAngle("Phi", &phi, -89.0f, 89.0f);
		ImGui::Text("Orientation");
		ImGui::SliderAngle("Roll", &roll, -180.0f, 180.0f);
		ImGui::SliderAngle("Pitch", &pitch, -180.0f, 180.0f);
		ImGui::SliderAngle("Yaw", &yaw, -180.0f, 180.0f);

		if (ImGui::Button("Reset")){
			Reset();
		}
	}
	ImGui::End();
}

void Camera::Reset() noexcept {
	r = 20.0f;
	theta = 0.0f;
	phi = 0.0f;
	pitch = 0.0f;
	yaw = 0.0f;
	roll = 0.0f;
}