[ADD] comments

src/gui/gui_interactable.cpp

@@ -0,0 +1,82 @@
+#include <GLFW/glfw3.h>
+#include "gui_interactable.h"
+
+namespace gui
+{
+	InteractableGui::InteractableGui(int default_texture, glm::vec2 position, glm::vec2 scale)
+		: GuiTexture(default_texture, position, scale)
+	{
+		this->default_texture = default_texture;
+
+		minXY = glm::vec2(position.x - scale.x, position.y - scale.y);
+		maxXY = glm::vec2(position.x + scale.x, position.y + scale.y);
+	}
+
+	void InteractableGui::Update(GLFWwindow* window)
+	{
+		if (IsHoveringAbove(window) && glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS)
+		{
+			if (clicked_texture != 0)
+			{
+				texture = clicked_texture;
+			}
+			else
+			{
+				texture = default_texture;
+			}
+
+			if (!is_clicking)
+			{
+				OnClick();
+				is_clicking = true;
+			}
+		}
+		else
+		{
+			if (is_clicking)
+			{
+				is_clicking = false;
+			}
+		}
+	}
+
+	bool InteractableGui::IsHoveringAbove(GLFWwindow* window)
+	{
+		double x_pos, y_pos;
+		glfwGetCursorPos(window, &x_pos, &y_pos);
+
+		const float x_rel = (x_pos / SCALED_WIDTH / DEFAULT_WIDTH) * 2.0f - 1.0f;
+		const float y_rel = -((y_pos / SCALED_HEIGHT / DEFAULT_HEIGHT) * 2.0f - 1.0f);
+
+		if (x_rel >= minXY.x && x_rel <= maxXY.x &&
+			y_rel >= minXY.y && y_rel <= maxXY.y)
+		{
+			if (hover_texture != 0)
+			{
+				texture = hover_texture;
+			}
+			else
+			{
+				texture = default_texture;
+			}
+
+			if (!is_hovering)
+			{
+				OnEnter();
+				is_hovering = true;
+			}
+
+			return true;
+		}
+
+		texture = default_texture;
+
+		if (is_hovering)
+		{
+			OnExit();
+			is_hovering = false;
+		}
+
+		return false;
+	}
+}