1 files changed, 92 insertions, 0 deletions
diff --git a/src/interface.cpp b/src/interface.cpp
new file mode 100644
index 0000000..aacc4b0
--- /dev/null
+++ b/src/interface.cpp
@@ -0,0 +1,92 @@
+#include "common.hpp"
+
+namespace interface {
+
+state_t::state_t(sf::RenderWindow *window_, world::world_t *world_)
+{
+	window = window_;
+	world = world_;
+}
+
+static sf::Vector2f compute_drag(sf::RenderWindow *window, sf::Vector2f drag_ref)
+{
+	sf::Vector2i mouse = sf::Mouse::getPosition(*window);
+	sf::Vector2f vmouse = window->mapPixelToCoords(mouse);
+	return -(vmouse - drag_ref);
+}
+
+void state_t::tick(void)
+{
+	sf::Vector2u size;
+	sf::Event event;
+	sf::Vector2f view_size;
+
+	size = window->getSize();
+
+	camera.zoom = (camera.zoom + camera.target_zoom) / 2;
+
+	{
+		float view_scale;
+
+		view_scale = 3 * exp(camera.zoom * 0.3);
+		if (size.x > size.y) {
+			view_size.y = view_scale;
+			view_size.x = view_scale * size.x / size.y;
+		} else {
+			view_size.x = view_scale;
+			view_size.y = view_scale * size.y / size.x;
+		}
+
+		window->setView(sf::View(camera.center, view_size));
+	}
+
+
+	while (window->pollEvent(event)) {
+		switch (event.type)  {
+		case sf::Event::Closed:
+			window->close();
+			return;
+
+		case sf::Event::MouseButtonPressed:
+			if (event.mouseButton.button == 0) {
+				sf::Vector2f vmouse = window->mapPixelToCoords(
+				                      sf::Vector2i(event.mouseButton.x,
+				                      event.mouseButton.y));
+				world->get_tile(vmouse.x, vmouse.y)->type = 0;
+			}
+			if (event.mouseButton.button == 1) {
+				camera.dragging = true;
+				camera.drag_ref = window->mapPixelToCoords(
+				                  sf::Vector2i(event.mouseButton.x,
+				                  event.mouseButton.y));
+			}
+			break;
+
+		case sf::Event::MouseButtonReleased:
+			if (event.mouseButton.button == 1) {
+				if (camera.dragging)
+					camera.center += compute_drag(window, camera.drag_ref);
+				camera.dragging = false;
+			}
+			break;
+
+		case sf::Event::MouseWheelScrolled:
+			camera.target_zoom -= event.mouseWheelScroll.delta;
+			if (camera.target_zoom < 0)
+				camera.target_zoom = 0;
+			if (camera.target_zoom > 10)
+				camera.target_zoom = 10;
+			break;
+
+		default:;
+		}
+	}
+
+	if (camera.dragging) {
+		sf::Vector2f delta = compute_drag(window, camera.drag_ref);
+		window->setView(sf::View(camera.center + delta, view_size));
+	} else
+		window->setView(sf::View(camera.center, view_size));
+}
+
+} // namespace interface