canvas_interaction.h File Reference

Free functions for canvas interaction handling. More...

#include "app/gui/canvas/canvas_events.h"
#include "app/gui/canvas/canvas_state.h"
#include "app/gfx/core/bitmap.h"
#include "app/gfx/render/tilemap.h"
#include "imgui/imgui.h"

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Go to the source code of this file.

Namespaces
namespace	yaze
	Main namespace for the application.
namespace	yaze::gui
	Graphical User Interface (GUI) components for the application.

Functions
RectSelectionEvent	yaze::gui::HandleRectangleSelection (const CanvasGeometry &geometry, int current_map, float tile_size, ImDrawList *draw_list, ImGuiMouseButton mouse_button=ImGuiMouseButton_Right)
	Handle rectangle selection interaction.
TileSelectionEvent	yaze::gui::HandleTileSelection (const CanvasGeometry &geometry, int current_map, float tile_size, ImGuiMouseButton mouse_button=ImGuiMouseButton_Right)
	Handle single tile selection (right-click)
TilePaintEvent	yaze::gui::HandleTilePaint (const CanvasGeometry &geometry, int tile_id, float tile_size, ImGuiMouseButton mouse_button=ImGuiMouseButton_Left)
	Handle tile painting interaction.
TilePaintEvent	yaze::gui::HandleTilePaintWithPreview (const CanvasGeometry &geometry, const gfx::Bitmap &bitmap, float tile_size, ImDrawList *draw_list, ImGuiMouseButton mouse_button=ImGuiMouseButton_Left)
	Handle tile painter with bitmap preview.
TilePaintEvent	yaze::gui::HandleTilemapPaint (const CanvasGeometry &geometry, const gfx::Tilemap &tilemap, int current_tile, ImDrawList *draw_list, ImGuiMouseButton mouse_button=ImGuiMouseButton_Left)
	Handle tilemap painting interaction.
HoverEvent	yaze::gui::HandleHover (const CanvasGeometry &geometry, float tile_size)
	Update hover state for canvas.
void	yaze::gui::RenderHoverPreview (const CanvasGeometry &geometry, const HoverEvent &hover, float tile_size, ImDrawList *draw_list, ImU32 color=IM_COL32(255, 255, 255, 80))
	Render hover preview overlay.
EntityInteractionEvent	yaze::gui::HandleEntityInteraction (const CanvasGeometry &geometry, int entity_id, ImVec2 entity_position)
	Handle entity interaction (hover, click, drag)
ImVec2	yaze::gui::AlignToGrid (ImVec2 pos, float grid_step)
	Align position to grid.
ImVec2	yaze::gui::GetMouseInCanvasSpace (const CanvasGeometry &geometry)
	Get mouse position in canvas space.
bool	yaze::gui::IsMouseInCanvas (const CanvasGeometry &geometry)
	Check if mouse is in canvas bounds.
ImVec2	yaze::gui::CanvasToTileGrid (ImVec2 canvas_pos, float tile_size, float global_scale)
	Calculate tile grid indices from canvas position.

Detailed Description

Free functions for canvas interaction handling.

Phase 2 of Canvas refactoring: Extract interaction logic into event-driven free functions. These functions replace the stateful CanvasInteractionHandler methods with pure functions that return event payloads.

Design Pattern:

• Input: Canvas geometry, mouse state, interaction parameters
• Output: Event payload struct (TilePaintEvent, RectSelectionEvent, etc.)
• No hidden state, fully testable
• Editors consume events and respond accordingly

Definition in file canvas_interaction.h.