--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/infinite_canvas/canvas.h	Mon Aug 17 16:57:56 2026 -0700
@@ -0,0 +1,137 @@
+#ifndef INFINITE_CANVAS_CANVAS_H
+#define INFINITE_CANVAS_CANVAS_H
+
+#include "dowa/dowa.h"
+#include "infinite_canvas/theme.h"
+#include "third_party/raylib/include/raylib.h"
+
+#define CANVAS_MAX_ENTITIES 1024
+#define CANVAS_WEB_FRAME_INSET 8.0f
+#define CANVAS_WEB_RESIZE_HANDLE 18.0f
+#define CANVAS_WEB_MIN_WIDTH 160.0f
+#define CANVAS_WEB_MIN_HEIGHT 120.0f
+#define CANVAS_CONTEXT_MAX_LENGTH (64 * 1024)
+
+typedef enum {
+    CANVAS_ENTITY_RECTANGLE = 0,
+    CANVAS_ENTITY_CIRCLE,
+    CANVAS_ENTITY_LINE,
+    CANVAS_ENTITY_TEXT,
+    CANVAS_ENTITY_BUTTON,
+    CANVAS_ENTITY_TEXT_AREA,
+    CANVAS_ENTITY_DROPDOWN,
+    CANVAS_ENTITY_ACCORDION,
+    CANVAS_ENTITY_CARD,
+    CANVAS_ENTITY_CALENDAR,
+    CANVAS_ENTITY_SWITCH,
+    CANVAS_ENTITY_TABLE,
+    CANVAS_ENTITY_NOTIFICATION,
+    CANVAS_ENTITY_SCROLL_AREA,
+    CANVAS_ENTITY_IMAGE,
+    CANVAS_ENTITY_WEB_CONTENT,
+    CANVAS_ENTITY_TYPE_COUNT,
+} Canvas_Entity_Type;
+
+typedef struct {
+    uint32 id;
+    Canvas_Entity_Type type;
+    Vector2 position;
+    Vector2 size;
+    Color color;
+    char text[128];
+    int32 value;
+    boolean active;
+    boolean pinned;
+    boolean screen_space_initialized;
+    float hover_amount;
+    float animation_amount;
+    Vector2 pinned_screen_position;
+    Vector2 pinned_screen_size;
+} Canvas_Entity;
+
+typedef struct {
+    Vector2 target;
+    float zoom;
+    int32 viewport_width;
+    int32 viewport_height;
+    float min_zoom;
+    float max_zoom;
+} Canvas_Camera;
+
+typedef struct {
+    Dowa_Arena *p_arena;
+    Canvas_Entity *p_entities;
+    uint32 next_entity;
+    uint32 next_entity_id;
+    int32 selected_index;
+    int32 pressed_index;
+    int32 hover_index;
+    boolean dragging;
+    boolean resizing;
+    boolean show_grid;
+    float notification_stack_amount;
+    Vector2 pointer_start;
+    Vector2 entity_start;
+    Vector2 entity_size_start;
+} Canvas_Scene;
+
+typedef struct {
+    size_t visible_count;
+    size_t bytes_written;
+    boolean truncated;
+} Canvas_Context_Snapshot;
+
+void Canvas_Camera_Init(Canvas_Camera *p_camera, int32 width, int32 height);
+void Canvas_Camera_Set_Viewport(Canvas_Camera *p_camera, int32 width, int32 height);
+Vector2 Canvas_Camera_Screen_To_World(const Canvas_Camera *p_camera, Vector2 screen);
+Vector2 Canvas_Camera_World_To_Screen(const Canvas_Camera *p_camera, Vector2 world);
+void Canvas_Camera_Pan(Canvas_Camera *p_camera, Vector2 screen_delta);
+void Canvas_Camera_Zoom_At(
+    Canvas_Camera *p_camera,
+    Vector2 screen_anchor,
+    float zoom_multiplier);
+Rectangle Canvas_Camera_Viewport_Bounds(const Canvas_Camera *p_camera);
+float Canvas_Grid_Spacing(float zoom);
+
+void Canvas_Scene_Init(Canvas_Scene *p_scene, Dowa_Arena *p_arena);
+boolean Canvas_Scene_Add(Canvas_Scene *p_scene, Canvas_Entity_Type type, Vector2 position);
+void Canvas_Scene_Clear(Canvas_Scene *p_scene);
+void Canvas_Scene_Add_Demo(Canvas_Scene *p_scene);
+void Canvas_Scene_Add_Browser_Grid(Canvas_Scene *p_scene);
+int32 Canvas_Scene_Pick(
+    const Canvas_Scene *p_scene,
+    Vector2 world_pointer,
+    float zoom);
+boolean Canvas_Scene_Update_Interaction(
+    Canvas_Scene *p_scene,
+    const Canvas_Camera *p_camera,
+    boolean block_pointer_input);
+boolean Canvas_Scene_Is_Text_Editing(const Canvas_Scene *p_scene);
+void Canvas_Scene_Toggle_Selected_Pin(
+    Canvas_Scene *p_scene,
+    const Canvas_Camera *p_camera);
+void Canvas_Scene_Sync_Pinned(
+    Canvas_Scene *p_scene,
+    const Canvas_Camera *p_camera);
+void Canvas_Scene_Update_Notification_Stack(
+    Canvas_Scene *p_scene,
+    const Canvas_Camera *p_camera);
+Canvas_Context_Snapshot Canvas_Scene_Build_Visible_Context(
+    const Canvas_Scene *p_scene,
+    const Canvas_Camera *p_camera,
+    char *p_buffer,
+    size_t buffer_size);
+
+void Canvas_Update_Camera_Input(
+    Canvas_Camera *p_camera,
+    boolean block_pointer_input,
+    boolean block_keyboard_input);
+void Canvas_Draw_World(
+    const Canvas_Camera *p_camera,
+    const Canvas_Scene *p_scene,
+    Font font,
+    const Canvas_Theme *p_theme);
+
+const char *Canvas_Entity_Type_Name(Canvas_Entity_Type type);
+
+#endif