renaming viewport panel to scene panel

2026-09-30 22:10:08 -07:00
parent b5b0eb9497
commit 379589fe8c
3 changed files with 16 additions and 16 deletions
@@ -0,0 +1,61 @@
+#pragma once
+
+#include <sophia/entity.hpp>
+#include <sophia/frame_info.hpp>
+#include <sophia/handles.hpp>
+#include <sophia/math.hpp>
+#include <sophia/scene.hpp>
+#include <sophia/ui/panel.hpp>
+#include <sophia/ui/ui.hpp>
+
+/**
+ * Shows the scene through its active camera. Click a sprite to select it,
+ * drag it to move it (in Move mode).
+ *
+ * Picking and moving are 2D: they assume an orthographic camera rotated only
+ * around Z, and work in the z = 0 plane.
+ */
+class ScenePanel : public sophia::Panel {
+ public:
+  ScenePanel(sophia::UI& ui, sophia::RenderTargetHandle target,
+             sophia::Scene& scene, sophia::Entity& selected)
+      : Panel{{.name = "Scene",
+               .windowFlags = ImGuiWindowFlags_NoScrollbar |
+                              ImGuiWindowFlags_NoScrollWithMouse}},
+        ui{ui},
+        target{target},
+        scene{scene},
+        selected{selected} {}
+
+  void onUpdate(const sophia::FrameInfo& frameInfo) override;
+
+ private:
+  // Where the scene image is on screen this frame, and the camera looking
+  // through it.
+  struct ViewportTransform {
+    ImVec2 origin;
+    ImVec2 size;
+    glm::mat4 viewProjection;
+    glm::mat4 inverseViewProjection;
+
+    ImVec2 worldToScreen(const glm::vec3& world) const;
+    glm::vec2 screenToWorld(const ImVec2& screen) const;
+  };
+
+  void drawToolbar();
+  void drawGrid(ImVec2 origin, ImVec2 size);
+  void handleInput(const ViewportTransform& viewport);
+  void drawSelection(const ViewportTransform& viewport);
+
+  // The top-most sprite under `world`, or a null Entity.
+  sophia::Entity pick(glm::vec2 world);
+
+  sophia::UI& ui;
+  sophia::RenderTargetHandle target;
+  sophia::Scene& scene;
+  sophia::Entity& selected;
+
+  bool showGrid = true;
+  // Set while a drag that started on the selected entity is moving it.
+  bool dragging = false;
+};