feat: implement Phase 2 - Core Canvas Engine with layer system
Complete canvas rendering infrastructure and state management: **Type System (types/)** - Layer interface with blend modes, opacity, visibility - Canvas state with zoom, pan, grid, rulers - Tool types and settings interfaces - Selection and pointer state types **State Management (store/)** - Layer store: CRUD operations, reordering, merging, flattening - Canvas store: zoom (0.1x-10x), pan, grid, rulers, coordinate conversion - Tool store: active tool, brush settings (size, opacity, hardness, flow) - Full Zustand integration with selectors **Utilities (lib/)** - Canvas utils: create, clone, resize, load images, draw grid/checkerboard - General utils: cn, clamp, lerp, distance, snap to grid, debounce, throttle - Image data handling with error safety **Components** - CanvasWrapper: Multi-layer rendering with transformations - Checkerboard transparency background - Layer compositing with blend modes and opacity - Grid overlay support - Selection visualization - Mouse wheel zoom (Ctrl+scroll) - Middle-click or Shift+click panning - LayersPanel: Interactive layer management - Visibility toggle with eye icon - Active layer selection - Opacity display - Delete with confirmation - Sorted by z-order - EditorLayout: Full editor interface - Top toolbar with zoom controls (±, fit to screen, percentage) - Canvas area with full viewport - Right sidebar for layers panel - "New Layer" button with auto-naming **Features Implemented** ✓ Multi-layer canvas with proper z-ordering ✓ Layer visibility, opacity, blend modes ✓ Zoom: 10%-1000% with Ctrl+wheel ✓ Pan: Middle-click or Shift+drag ✓ Grid overlay (toggleable) ✓ Selection rendering ✓ Background color support ✓ Create/delete/duplicate layers ✓ Layer merging and flattening **Performance** - Dev server: 451ms startup - Efficient canvas rendering with transformations - Debounced/throttled event handlers ready - Memory-safe image data operations Ready for Phase 3: History & Undo System 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
171
store/canvas-store.ts
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171
store/canvas-store.ts
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@@ -0,0 +1,171 @@
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import { create } from 'zustand';
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import type { CanvasState, Selection, Point } from '@/types';
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interface CanvasStore extends CanvasState {
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/** Selection state */
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selection: Selection;
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/** Set canvas dimensions */
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setDimensions: (width: number, height: number) => void;
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/** Set zoom level */
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setZoom: (zoom: number) => void;
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/** Zoom in (1.2x) */
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zoomIn: () => void;
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/** Zoom out (0.8x) */
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zoomOut: () => void;
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/** Fit canvas to viewport */
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zoomToFit: (viewportWidth: number, viewportHeight: number) => void;
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/** Zoom to actual size (100%) */
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zoomToActual: () => void;
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/** Set pan offset */
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setPanOffset: (x: number, y: number) => void;
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/** Pan by delta */
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pan: (dx: number, dy: number) => void;
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/** Reset pan to center */
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resetPan: () => void;
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/** Toggle grid visibility */
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toggleGrid: () => void;
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/** Set grid size */
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setGridSize: (size: number) => void;
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/** Toggle rulers */
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toggleRulers: () => void;
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/** Toggle snap to grid */
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toggleSnapToGrid: () => void;
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/** Set background color */
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setBackgroundColor: (color: string) => void;
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/** Set selection */
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setSelection: (selection: Partial<Selection>) => void;
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/** Clear selection */
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clearSelection: () => void;
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/** Convert screen coordinates to canvas coordinates */
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screenToCanvas: (screenX: number, screenY: number) => Point;
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/** Convert canvas coordinates to screen coordinates */
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canvasToScreen: (canvasX: number, canvasY: number) => Point;
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}
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const DEFAULT_CANVAS_WIDTH = 800;
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const DEFAULT_CANVAS_HEIGHT = 600;
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const MIN_ZOOM = 0.1;
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const MAX_ZOOM = 10;
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const ZOOM_STEP = 1.2;
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export const useCanvasStore = create<CanvasStore>((set, get) => ({
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width: DEFAULT_CANVAS_WIDTH,
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height: DEFAULT_CANVAS_HEIGHT,
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zoom: 1,
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offsetX: 0,
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offsetY: 0,
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backgroundColor: '#ffffff',
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showGrid: false,
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gridSize: 20,
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showRulers: true,
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snapToGrid: false,
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selection: {
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active: false,
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x: 0,
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y: 0,
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width: 0,
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height: 0,
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},
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setDimensions: (width, height) => {
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set({ width, height });
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},
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setZoom: (zoom) => {
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const clampedZoom = Math.max(MIN_ZOOM, Math.min(MAX_ZOOM, zoom));
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set({ zoom: clampedZoom });
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},
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zoomIn: () => {
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const { zoom } = get();
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get().setZoom(zoom * ZOOM_STEP);
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},
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zoomOut: () => {
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const { zoom } = get();
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get().setZoom(zoom / ZOOM_STEP);
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},
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zoomToFit: (viewportWidth, viewportHeight) => {
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const { width, height } = get();
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const padding = 40;
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const scaleX = (viewportWidth - padding * 2) / width;
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const scaleY = (viewportHeight - padding * 2) / height;
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const zoom = Math.min(scaleX, scaleY, 1);
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set({ zoom, offsetX: 0, offsetY: 0 });
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},
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zoomToActual: () => {
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set({ zoom: 1 });
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},
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setPanOffset: (x, y) => {
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set({ offsetX: x, offsetY: y });
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},
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pan: (dx, dy) => {
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set((state) => ({
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offsetX: state.offsetX + dx,
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offsetY: state.offsetY + dy,
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}));
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},
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resetPan: () => {
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set({ offsetX: 0, offsetY: 0 });
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},
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toggleGrid: () => {
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set((state) => ({ showGrid: !state.showGrid }));
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},
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setGridSize: (size) => {
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set({ gridSize: Math.max(1, size) });
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},
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toggleRulers: () => {
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set((state) => ({ showRulers: !state.showRulers }));
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},
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toggleSnapToGrid: () => {
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set((state) => ({ snapToGrid: !state.snapToGrid }));
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},
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setBackgroundColor: (color) => {
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set({ backgroundColor: color });
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},
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setSelection: (selection) => {
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set((state) => ({
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selection: { ...state.selection, ...selection },
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}));
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},
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clearSelection: () => {
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set({
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selection: {
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active: false,
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x: 0,
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y: 0,
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width: 0,
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height: 0,
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},
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});
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},
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screenToCanvas: (screenX, screenY) => {
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const { zoom, offsetX, offsetY } = get();
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return {
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x: (screenX - offsetX) / zoom,
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y: (screenY - offsetY) / zoom,
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};
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},
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canvasToScreen: (canvasX, canvasY) => {
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const { zoom, offsetX, offsetY } = get();
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return {
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x: canvasX * zoom + offsetX,
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y: canvasY * zoom + offsetY,
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};
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},
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}));
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3
store/index.ts
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3
store/index.ts
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@@ -0,0 +1,3 @@
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export * from './canvas-store';
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export * from './layer-store';
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export * from './tool-store';
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239
store/layer-store.ts
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239
store/layer-store.ts
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@@ -0,0 +1,239 @@
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import { create } from 'zustand';
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import { v4 as uuidv4 } from 'uuid';
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import type { Layer, LayerUpdate, CreateLayerParams, BlendMode } from '@/types';
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interface LayerStore {
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/** All layers in the canvas */
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layers: Layer[];
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/** ID of the currently active layer */
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activeLayerId: string | null;
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/** Create a new layer */
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createLayer: (params: CreateLayerParams) => Layer;
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/** Delete a layer by ID */
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deleteLayer: (id: string) => void;
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/** Update layer properties */
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updateLayer: (id: string, updates: LayerUpdate) => void;
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/** Set active layer */
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setActiveLayer: (id: string) => void;
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/** Duplicate a layer */
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duplicateLayer: (id: string) => Layer | null;
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/** Reorder layers */
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reorderLayer: (id: string, newOrder: number) => void;
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/** Merge layer with layer below */
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mergeDown: (id: string) => void;
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/** Flatten all visible layers */
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flattenLayers: () => Layer | null;
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/** Get layer by ID */
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getLayer: (id: string) => Layer | undefined;
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/** Get active layer */
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getActiveLayer: () => Layer | undefined;
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/** Clear all layers */
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clearLayers: () => void;
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}
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export const useLayerStore = create<LayerStore>((set, get) => ({
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layers: [],
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activeLayerId: null,
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createLayer: (params) => {
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const now = Date.now();
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const layer: Layer = {
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id: uuidv4(),
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name: params.name || `Layer ${get().layers.length + 1}`,
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canvas: null,
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visible: true,
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opacity: params.opacity ?? 1,
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blendMode: params.blendMode || 'normal',
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order: get().layers.length,
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locked: false,
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width: params.width,
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height: params.height,
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x: params.x ?? 0,
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y: params.y ?? 0,
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createdAt: now,
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updatedAt: now,
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};
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// Create canvas element
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const canvas = document.createElement('canvas');
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canvas.width = layer.width;
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canvas.height = layer.height;
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// Fill with color if provided
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if (params.fillColor) {
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const ctx = canvas.getContext('2d');
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if (ctx) {
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ctx.fillStyle = params.fillColor;
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ctx.fillRect(0, 0, layer.width, layer.height);
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}
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}
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layer.canvas = canvas;
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set((state) => ({
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layers: [...state.layers, layer],
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activeLayerId: layer.id,
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}));
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return layer;
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},
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deleteLayer: (id) => {
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set((state) => {
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const newLayers = state.layers.filter((l) => l.id !== id);
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const newActiveId =
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state.activeLayerId === id
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? newLayers[newLayers.length - 1]?.id || null
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: state.activeLayerId;
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return {
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layers: newLayers,
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activeLayerId: newActiveId,
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};
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});
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},
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updateLayer: (id, updates) => {
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set((state) => ({
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layers: state.layers.map((layer) =>
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layer.id === id
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? { ...layer, ...updates, updatedAt: Date.now() }
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: layer
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),
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}));
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},
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setActiveLayer: (id) => {
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set({ activeLayerId: id });
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},
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duplicateLayer: (id) => {
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const layer = get().getLayer(id);
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if (!layer) return null;
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const now = Date.now();
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const newLayer: Layer = {
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...layer,
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id: uuidv4(),
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name: `${layer.name} copy`,
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order: get().layers.length,
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createdAt: now,
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updatedAt: now,
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};
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// Clone canvas
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if (layer.canvas) {
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const canvas = document.createElement('canvas');
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canvas.width = layer.width;
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canvas.height = layer.height;
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const ctx = canvas.getContext('2d');
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if (ctx) {
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ctx.drawImage(layer.canvas, 0, 0);
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}
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newLayer.canvas = canvas;
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}
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set((state) => ({
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layers: [...state.layers, newLayer],
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activeLayerId: newLayer.id,
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}));
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return newLayer;
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},
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reorderLayer: (id, newOrder) => {
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set((state) => {
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const layers = [...state.layers];
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const layerIndex = layers.findIndex((l) => l.id === id);
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if (layerIndex === -1) return state;
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const [layer] = layers.splice(layerIndex, 1);
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layers.splice(newOrder, 0, layer);
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// Update order values
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return {
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layers: layers.map((l, index) => ({ ...l, order: index })),
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};
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});
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},
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mergeDown: (id) => {
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const layers = get().layers;
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const layerIndex = layers.findIndex((l) => l.id === id);
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if (layerIndex === -1 || layerIndex === 0) return;
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const topLayer = layers[layerIndex];
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const bottomLayer = layers[layerIndex - 1];
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if (!topLayer.canvas || !bottomLayer.canvas) return;
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// Merge onto bottom layer
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const ctx = bottomLayer.canvas.getContext('2d');
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if (!ctx) return;
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ctx.globalAlpha = topLayer.opacity;
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ctx.globalCompositeOperation = topLayer.blendMode as GlobalCompositeOperation;
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ctx.drawImage(topLayer.canvas, topLayer.x, topLayer.y);
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ctx.globalAlpha = 1;
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ctx.globalCompositeOperation = 'source-over';
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// Delete top layer
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get().deleteLayer(id);
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},
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flattenLayers: () => {
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const layers = get().layers.filter((l) => l.visible);
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if (layers.length === 0) return null;
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// Get canvas dimensions
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const width = Math.max(...layers.map((l) => l.width));
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const height = Math.max(...layers.map((l) => l.height));
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// Create flattened layer
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const flatLayer = get().createLayer({
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name: 'Flattened',
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width,
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height,
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});
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if (!flatLayer.canvas) return null;
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const ctx = flatLayer.canvas.getContext('2d');
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if (!ctx) return null;
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// Composite all visible layers
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layers.forEach((layer) => {
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if (layer.canvas) {
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ctx.globalAlpha = layer.opacity;
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ctx.globalCompositeOperation = layer.blendMode as GlobalCompositeOperation;
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ctx.drawImage(layer.canvas, layer.x, layer.y);
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}
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});
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ctx.globalAlpha = 1;
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ctx.globalCompositeOperation = 'source-over';
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// Delete old layers
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layers.forEach((layer) => {
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if (layer.id !== flatLayer.id) {
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get().deleteLayer(layer.id);
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}
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});
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return flatLayer;
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},
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getLayer: (id) => {
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return get().layers.find((l) => l.id === id);
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},
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getActiveLayer: () => {
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const { layers, activeLayerId } = get();
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return layers.find((l) => l.id === activeLayerId);
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},
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clearLayers: () => {
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set({ layers: [], activeLayerId: null });
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},
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}));
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107
store/tool-store.ts
Normal file
107
store/tool-store.ts
Normal file
@@ -0,0 +1,107 @@
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import { create } from 'zustand';
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import type { ToolType, ToolSettings, ToolState } from '@/types';
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interface ToolStore extends ToolState {
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/** Set active tool */
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setActiveTool: (tool: ToolType) => void;
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/** Update tool settings */
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updateSettings: (settings: Partial<ToolSettings>) => void;
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/** Set brush size */
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setSize: (size: number) => void;
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/** Set opacity */
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setOpacity: (opacity: number) => void;
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/** Set hardness */
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setHardness: (hardness: number) => void;
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/** Set color */
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setColor: (color: string) => void;
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/** Set flow */
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setFlow: (flow: number) => void;
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/** Set spacing */
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setSpacing: (spacing: number) => void;
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/** Reset settings to defaults */
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resetSettings: () => void;
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}
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const DEFAULT_SETTINGS: ToolSettings = {
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size: 10,
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opacity: 1,
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hardness: 1,
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color: '#000000',
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flow: 1,
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spacing: 0.25,
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};
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export const useToolStore = create<ToolStore>((set) => ({
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activeTool: 'brush',
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settings: { ...DEFAULT_SETTINGS },
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cursor: 'crosshair',
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setActiveTool: (tool) => {
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const cursors: Record<ToolType, string> = {
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select: 'crosshair',
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move: 'move',
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pencil: 'crosshair',
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brush: 'crosshair',
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eraser: 'crosshair',
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fill: 'crosshair',
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eyedropper: 'crosshair',
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text: 'text',
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shape: 'crosshair',
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crop: 'crosshair',
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clone: 'crosshair',
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blur: 'crosshair',
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sharpen: 'crosshair',
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};
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set({
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activeTool: tool,
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cursor: cursors[tool],
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});
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},
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updateSettings: (settings) => {
|
||||
set((state) => ({
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||||
settings: { ...state.settings, ...settings },
|
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}));
|
||||
},
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||||
|
||||
setSize: (size) => {
|
||||
set((state) => ({
|
||||
settings: { ...state.settings, size: Math.max(1, Math.min(1000, size)) },
|
||||
}));
|
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},
|
||||
|
||||
setOpacity: (opacity) => {
|
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set((state) => ({
|
||||
settings: { ...state.settings, opacity: Math.max(0, Math.min(1, opacity)) },
|
||||
}));
|
||||
},
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||||
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||||
setHardness: (hardness) => {
|
||||
set((state) => ({
|
||||
settings: { ...state.settings, hardness: Math.max(0, Math.min(1, hardness)) },
|
||||
}));
|
||||
},
|
||||
|
||||
setColor: (color) => {
|
||||
set((state) => ({
|
||||
settings: { ...state.settings, color },
|
||||
}));
|
||||
},
|
||||
|
||||
setFlow: (flow) => {
|
||||
set((state) => ({
|
||||
settings: { ...state.settings, flow: Math.max(0, Math.min(1, flow)) },
|
||||
}));
|
||||
},
|
||||
|
||||
setSpacing: (spacing) => {
|
||||
set((state) => ({
|
||||
settings: { ...state.settings, spacing: Math.max(0.01, Math.min(10, spacing)) },
|
||||
}));
|
||||
},
|
||||
|
||||
resetSettings: () => {
|
||||
set({ settings: { ...DEFAULT_SETTINGS } });
|
||||
},
|
||||
}));
|
||||
Reference in New Issue
Block a user