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"@babel/core/semver": ["semver@6.3.1", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA=="], "@babel/helper-compilation-targets/lru-cache": ["lru-cache@5.1.1", "", { "dependencies": { "yallist": "^3.0.2" } }, "sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w=="], @@ -1062,6 +1126,8 @@ "@typescript-eslint/typescript-estree/minimatch": ["minimatch@9.0.5", "", { "dependencies": { "brace-expansion": "^2.0.1" } }, "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow=="], + "@vitest/mocker/estree-walker": ["estree-walker@3.0.3", "", { "dependencies": { "@types/estree": "^1.0.0" } }, "sha512-7RUKfXgSMMkzt6ZuXmqapOurLGPPfgj6l9uRZ7lRGolvk0y2yocc35LdcxKC5PQZdn2DMqioAQ2NoWcrTKmm6g=="], + "eslint-import-resolver-node/debug": ["debug@3.2.7", "", { "dependencies": { "ms": "^2.1.1" } }, "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ=="], "eslint-module-utils/debug": ["debug@3.2.7", "", { "dependencies": { "ms": "^2.1.1" } }, "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ=="], diff --git a/package.json b/package.json index 67f05bb..ad2f015 100644 --- a/package.json +++ b/package.json @@ -29,6 +29,9 @@ "react": "^18.0.0", "react-dom": "^18.0.0" }, + "dependencies": { + "zustand": "^4.5.2" + }, "devDependencies": { "@rollup/plugin-commonjs": "^25.0.0", "@rollup/plugin-node-resolve": "^15.2.3", @@ -57,7 +60,8 @@ "storybook": "^8.2.0", "@storybook/react-vite": "^8.2.0", "@storybook/addon-essentials": "^8.2.0", - "vite": "^5.4.0" + "vite": "^5.4.0", + "vitest": "^2.0.5" }, "scripts": { "typecheck": "tsc -p tsconfig.json --noEmit", @@ -67,7 +71,8 @@ "lint:fix": "eslint . --ext .ts,.tsx --fix", "format": "prettier --check .", "format:fix": "prettier --write .", - "test": "echo 'No tests yet — placeholder for CI'", + "test": "vitest run", + "test:watch": "vitest", "storybook": "storybook dev -p 6006", "storybook:build": "storybook build", "changeset": "changeset", diff --git a/src/core/coords.test.ts b/src/core/coords.test.ts new file mode 100644 index 0000000..a9b0640 --- /dev/null +++ b/src/core/coords.test.ts @@ -0,0 +1,43 @@ +import { describe, it, expect } from 'vitest'; +import { + worldToScreen, + screenToWorld, + clampZoom, + zoomAtPoint, + type Camera, + type Point, +} from './coords'; + +describe('coords', () => { + it('worldToScreen and screenToWorld roundtrip', () => { + const camera: Camera = { zoom: 2, offsetX: 5, offsetY: -5 }; + const world: Point = { x: 10, y: 20 }; + + const screen = worldToScreen(world, camera); + expect(screen).toEqual({ x: (10 - 5) * 2, y: (20 - -5) * 2 }); + + const back = screenToWorld(screen, camera); + expect(back).toEqual(world); + }); + + it('clampZoom keeps zoom within bounds', () => { + expect(clampZoom(0.05)).toBeCloseTo(0.1); + expect(clampZoom(10)).toBeCloseTo(5); + expect(clampZoom(1)).toBeCloseTo(1); + }); + + it('zoomAtPoint keeps the target screen point stationary', () => { + const camera: Camera = { zoom: 1, offsetX: 0, offsetY: 0 }; + const p: Point = { x: 100, y: 50 }; // screen point in px + + const next = zoomAtPoint(camera, p, 2); + + // The world point under p before zoom + const worldBefore = screenToWorld(p, camera); + // After zoom, that same world point should map to the same screen point + const screenAfter = worldToScreen(worldBefore, next); + + expect(screenAfter.x).toBeCloseTo(p.x, 6); + expect(screenAfter.y).toBeCloseTo(p.y, 6); + }); +}); diff --git a/src/core/coords.ts b/src/core/coords.ts index 71a7a57..311a7d5 100644 --- a/src/core/coords.ts +++ b/src/core/coords.ts @@ -14,3 +14,47 @@ export function screenToWorld(p: Point, camera: Camera): Point { y: p.y / camera.zoom + camera.offsetY, }; } + +/** + * Clamp a zoom value to sane defaults (10%..500%). + * You can override min/max if needed. + */ +export function clampZoom(zoom: number, min = 0.1, max = 5): number { + if (!Number.isFinite(zoom)) return min; + if (zoom < min) return min; + if (zoom > max) return max; + return zoom; +} + +/** + * Apply pan in WORLD units. Positive dx moves the camera right (content appears to move left). + */ +export function applyPan(camera: Camera, dx: number, dy: number): Camera { + return { + zoom: camera.zoom, + offsetX: camera.offsetX + dx, + offsetY: camera.offsetY + dy, + }; +} + +/** + * Zoom at a specific SCREEN point, keeping that point visually stationary. + * factor > 1 zooms in; factor < 1 zooms out. + */ +export function zoomAtPoint(camera: Camera, screenPoint: Point, factor: number, min = 0.1, max = 5): Camera { + const targetWorld = screenToWorld(screenPoint, camera); + const nextZoom = clampZoom(camera.zoom * factor, min, max); + // Solve for offsets so that worldToScreen(targetWorld, nextCamera) == screenPoint + const nextOffsetX = targetWorld.x - screenPoint.x / nextZoom; + const nextOffsetY = targetWorld.y - screenPoint.y / nextZoom; + return { zoom: nextZoom, offsetX: nextOffsetX, offsetY: nextOffsetY }; +} + +/** + * Compute a CSS transform for a content layer representing WORLD space. + * Usage example: style={{ transform: cameraToCssTransform(camera) }} + */ +export function cameraToCssTransform(camera: Camera): string { + // translate in world units, then scale; keeps worldToScreen mapping: (x - offset) * zoom + return `translate(${-camera.offsetX}px, ${-camera.offsetY}px) scale(${camera.zoom})`; +} diff --git a/src/index.ts b/src/index.ts index 845e039..b5ed6c4 100644 --- a/src/index.ts +++ b/src/index.ts @@ -1,3 +1,4 @@ export * from './react/Canvas'; export * from './core/coords'; export * from './types'; +export * from './state/store'; diff --git a/src/react/Camera.stories.tsx b/src/react/Camera.stories.tsx new file mode 100644 index 0000000..07ded2d --- /dev/null +++ b/src/react/Camera.stories.tsx @@ -0,0 +1,71 @@ +import type { Meta, StoryObj } from '@storybook/react'; +import React from 'react'; +import { Canvas } from './Canvas'; +import { useCamera, useCanvasActions } from '../state/store'; +import { cameraToCssTransform } from '../core/coords'; + +const meta: Meta = { + title: 'Core/Camera', + component: Canvas, + tags: ['dev'], +}; + +export default meta; + +type Story = StoryObj; + +function Controls() { + const camera = useCamera(); + const { panBy, zoomTo, zoomByAt } = useCanvasActions(); + + const anchor = { x: 400, y: 300 }; // center of 800x600 viewport + + return ( +
+ + + + + + + + + zoom: {camera.zoom.toFixed(2)} | offset: ({camera.offsetX.toFixed(0)}, {camera.offsetY.toFixed(0)}) + +
+ ); +} + +function WorldLayer() { + const camera = useCamera(); + return ( +
+ {/* Big world area with a light grid */} +
+ {/* Markers at known world coords */} +
+
+
+
+
+ ); +} + +export const Playground: Story = { + render: () => ( +
+ + + + +
+ ), +}; diff --git a/src/state/store.ts b/src/state/store.ts new file mode 100644 index 0000000..a439ab0 --- /dev/null +++ b/src/state/store.ts @@ -0,0 +1,56 @@ +import { create } from 'zustand'; +import type { Camera, Point } from '../core/coords'; +import { applyPan, clampZoom, zoomAtPoint } from '../core/coords'; + +export const MIN_ZOOM = 0.1; +export const MAX_ZOOM = 5; + +export type CanvasState = { + readonly camera: Camera; +}; + +export type CanvasActions = { + setCamera: (camera: Camera) => void; + panBy: (dx: number, dy: number) => void; + zoomTo: (zoom: number) => void; + /** Zoom by factor centered at screenPoint (screen coords in px). */ + zoomByAt: (screenPoint: Point, factor: number) => void; +}; + +export type CanvasStore = CanvasState & CanvasActions; + +const initialCamera: Camera = { zoom: 1, offsetX: 0, offsetY: 0 }; + +// eslint-disable-next-line @typescript-eslint/no-unused-vars +export const useCanvasStore = create()((set, get) => ({ + camera: initialCamera, + + setCamera: (camera) => set({ camera }), + + panBy: (dx, dy) => set((s) => ({ camera: applyPan(s.camera, dx, dy) })), + + zoomTo: (zoom) => + set((s) => ({ + camera: { ...s.camera, zoom: clampZoom(zoom, MIN_ZOOM, MAX_ZOOM) }, + })), + + zoomByAt: (screenPoint, factor) => + set((s) => ({ camera: zoomAtPoint(s.camera, screenPoint, factor, MIN_ZOOM, MAX_ZOOM) })), +})); + +// Convenience hooks +export function useCamera(): Camera { + return useCanvasStore((s) => s.camera); +} + +export function useCanvasActions(): Pick< + CanvasActions, + 'setCamera' | 'panBy' | 'zoomTo' | 'zoomByAt' +> { + return useCanvasStore((s) => ({ + setCamera: s.setCamera, + panBy: s.panBy, + zoomTo: s.zoomTo, + zoomByAt: s.zoomByAt, + })); +}