added orbiting camera

src/Application.cpp

@@ -91,7 +91,6 @@ void Application::Init(int width, int height, const std::string& title)
 
 			float aspectRatio = (float)width / (float)height;
 			data->camera->Update(100.0f, aspectRatio, 0.01f, 100.0f);
-			data->orthoCam->Update(-3.0f * aspectRatio, 3.0f * aspectRatio, -3.0f, 3.0f, -100.0f, 100.0f);
 
 			glViewport(0, 0, width, height);
 		}
@@ -121,17 +120,11 @@ void Application::Init(int width, int height, const std::string& title)
 	ImGui::StyleColorsDark();
 
 	float aspectRatio = (float)windowWidth / (float)windowHeight;
-	camera = Camera(100.0f, aspectRatio);
-	camera.Move(glm::vec3(0.0f, 4.0f, -4.0f));
-	camera.LookAt(glm::vec3(0.0f));
+	camera = OrbitingCamera(glm::vec3(0.0f, 0.0f, 0.0f), 6.0f);
+	pitch = camera.GetAngles().x;
+	yaw = camera.GetAngles().y;
 
-	orthoCam = OrthogonalCamera(-3.0f * aspectRatio, 3.0f * aspectRatio, -3.0f, 3.0f);
-	orthoCam.Move(glm::vec3(0.0f, 4.0f, -4.0f));
-	orthoCam.LookAt(glm::vec3(0.0f));
-
-	activeCamera = &camera;
-
-	plot = new Plot3D({ -glm::two_pi<float>(), -glm::two_pi<float>(), -1.5f, glm::two_pi<float>(), glm::two_pi<float>(), 1.5f }, 0.5f, 0.1f,
+	plot = new Plot3D({ -glm::two_pi<float>(), -1.5f * glm::two_pi<float>(), -1.5f, glm::two_pi<float>(), 1.5f * glm::two_pi<float>(), 1.5f }, 0.5f, 0.1f,
 		[](float x, float y)
 		{
 			return (cos(x) + cos(y)) * 0.5f;
@@ -144,7 +137,6 @@ void Application::Init(int width, int height, const std::string& title)
 	cubeScale = glm::vec3(1.0f);
 
 	data.camera = &camera;
-	data.orthoCam = &orthoCam;
 
 	glfwWindowHint(GLFW_SAMPLES, 4);
 
@@ -162,6 +154,8 @@ void Application::Launch()
 		plot->SetRotation(cubeOrientation);
 		plot->SetScale(cubeScale);
 
+		camera.SetPosition(pitch, yaw);
+
 		glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
@@ -169,7 +163,7 @@ void Application::Launch()
 		ImGui_ImplGlfw_NewFrame();
 		ImGui::NewFrame();
 
-		plot->Draw(*activeCamera);
+		plot->Draw(camera);
 
 		ImGui::Begin("Debug");
 
@@ -182,16 +176,8 @@ void Application::Launch()
 
 		if (ImGui::CollapsingHeader("Camera"))
 		{
-			ImGui::Columns(2);
-			ImGui::Text("Projection: ");
-			ImGui::NextColumn();
-			if (ImGui::Button((activeCamera == &camera) ? "Perspective" : "Orthographic"))
-			{
-				if (activeCamera == &camera)
-					activeCamera = &orthoCam;
-				else
-					activeCamera = &camera;
-			}
+			ImGui::SliderFloat("Yaw", &yaw, 0.0f, 360.0f);
+			ImGui::SliderFloat("Pitch", &pitch, 1.0f, 179.0f);
 		}
 
 		ImGui::End();

src/Application.hpp

@@ -1,7 +1,7 @@
 #pragma once
 
 #include <string>
-#include "backend/Camera.hpp"
+#include "OrbitingCamera.hpp"
 #include "Plot3D.hpp"
 
 struct GLFWwindow;
@@ -42,9 +42,8 @@ private:
 	GLFWwindow* window = nullptr;
 	WindowData data;
 
-	Camera camera;
-	OrthogonalCamera orthoCam;
-	CameraBase* activeCamera;
+	OrbitingCamera camera;
+	float pitch, yaw;
 
 	glm::vec3 cubeOrientation, cubePosition, cubeScale;
 	Plot3D* plot;

src/CMakeLists.txt

@@ -1,6 +1,6 @@
 add_executable(visualizer
 	"main.cpp" "Application.cpp" 
-   "Plot3D.cpp")
+   "Plot3D.cpp" "OrbitingCamera.cpp")
 
 target_sources(visualizer PUBLIC 
 	${VENDOR_DIR}/imgui/backends/imgui_impl_opengl3.cpp

src/OrbitingCamera.cpp

@@ -0,0 +1,39 @@
+#include "OrbitingCamera.hpp"
+
+OrbitingCamera::OrbitingCamera(const glm::vec3& target, float distance, const glm::vec2& pitchRange) :
+	target(target), distance(distance), pitchRange(pitchRange)
+{
+	pitch = pitchRange.x + (pitchRange.y - pitchRange.x) / 2;
+	yaw = 0.0f;
+}
+
+void OrbitingCamera::Pan(float amount)
+{
+	yaw += amount;
+	if (yaw < 0.0f || yaw >= 360.0f)
+		yaw = 0.0f;
+
+	CalculateMatrix();
+}
+
+void OrbitingCamera::Tilt(float amount)
+{
+	pitch += amount;
+	if (pitch < pitchRange.x)
+		pitch = pitchRange.x;
+	else if (pitch > pitchRange.y)
+		pitch = pitchRange.y;
+
+	CalculateMatrix();
+}
+
+void OrbitingCamera::CalculateMatrix()
+{
+	glm::vec3 position = distance * glm::vec3(
+		cos(glm::radians(yaw)) * sin(glm::radians(pitch)),
+		cos(glm::radians(pitch)),
+		sin(glm::radians(yaw)) * sin(glm::radians(pitch))
+	);
+
+	transformation = glm::lookAt(position, target, glm::vec3(0.0f, 1.0f, 0.0f));
+}

src/OrbitingCamera.hpp

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "backend/Camera.hpp"
+
+class OrbitingCamera : public Camera
+{
+public:
+	OrbitingCamera() {}
+	OrbitingCamera(const glm::vec3& target, float distance, const glm::vec2& verticalRange = glm::vec2(1.0f, 179.0f));
+
+	inline void SetPosition(float pitch, float yaw)
+	{
+		this->pitch = pitch;
+		this->yaw = yaw;
+
+		CalculateMatrix();
+	}
+
+	inline glm::vec2 GetAngles()
+	{
+		return glm::vec2(pitch, yaw);
+	}
+
+	void Pan(float amount);
+	void Tilt(float amount);
+
+private:
+	void CalculateMatrix();
+
+private:
+	float pitch, yaw;
+	float distance;
+	glm::vec3 target;
+
+	glm::vec2 pitchRange;
+};