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136
.gitignore vendored
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# Logs
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103
README.md
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Pan/zoom library for SVG elements. Hold and drag to pan. Use the mouse wheel to Pan/zoom library for SVG elements. Hold and drag to pan. Use the mouse wheel to
zoom. See `src/app.js` for a usage example. zoom. See `src/app.js` for a usage example.
## Usage ## To view the demo using Docker
### Requirements
All the content to be panned/zoomed must be in one root element.
`image.svg`
``` xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg viewBox="..." version="1.1" xmlns="http://www.w3.org/2000/svg">
<g id="main">
<!-- SVG elements to be panned/zoomed... -->
</g>
</svg>
```
`index.html`
``` html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
</head>
<body>
<object type="image/svg+xml" data="image.svg"></object>
<script src="index.js"></script>
</body>
</html>
```
### Standard
`index.js`
``` js
import { pan, zoom } from 'pan-zoom';
const optionalZoomFactor = 0.1,
object = document.querySelector('object');
window.addEventListener('load', function () {
const svg = object.contentDocument.querySelector('svg'),
targetEl = svg.querySelector('#main');
svg.addEventListener('wheel', zoom(targetEl, optionalZoomFactor), { passive: false });
svg.addEventListener('pointerdown', pan(targetEl), { passive: false });
});
```
### With restore
The same as standard except the pan/zoom returns to what it was after a page
refresh.
`index.js`
``` js
import { withRestore as panzoom } from 'pan-zoom';
const object = document.querySelector('object');
window.addEventListener('load', function () {
const svg = object.contentDocument.querySelector('svg');
panzoom.start(svg, '#main');
});
```
## Start the demo
### Docker
1. Install the development server packages. 1. Install the development server packages.
$ docker run --rm -w /app -v $PWD:/app -u $(id -u):$(id -u) node npm install docker run --rm -w /app -v $PWD:/app -u $(id -u):$(id -u) node npm install
2. Start the server. 2. Start the server.
$ docker run --rm --init -it -w /app -v $PWD:/app -p 8080:8080 node npm run start docker run --rm --init -it -w /app -v $PWD:/app -p 8080:8080 node node dev-server.js
3. Visit `localhost:8080` to view. 3. Visit `localhost:8080` to view.
### Debian
1. Install the development server packages.
$ npm install
2. Start the server.
$ npm run start
3. Visit `localhost:8080` to view.
## Tests
Requires Chrome/ChromeDriver or Chromium/ChromiumDriver.
### Docker
$ docker run --rm --init -it -w /app -v $PWD:/app node bash -c "apt-get \
update && apt-get install -y chromium-driver chromium && npm run test"
### Debian
$ apt-get update && apt-get install chromium-driver chromium
$ npm run test

21
__tests__/integration/page.spec.js
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const { Builder } = require('selenium-webdriver');
const chrome = require('selenium-webdriver/chrome');
const chromeOptions = new chrome.Options();
let driver;
chromeOptions.addArguments('--headless', '--disable-gpu', '--no-sandbox');
beforeEach(async () => {
const builder = new Builder().forBrowser('chrome').setChromeOptions(chromeOptions);
driver = builder.build();
});
it('loads the page', async () => {
await driver.get('http://localhost:8080');
expect(await driver.getTitle()).toEqual('SVG Element Pan & Zoom Demo');
});
afterEach(async () => {
await driver.quit();
});

21
__tests__/integration/setup.js
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@ -1,21 +0,0 @@
const { spawn } = require('child_process');
module.exports = async function (globalConfig, projectConfig) {
console.info('\nSpawning server process...');
const child = spawn('node', ['server.js']);
child.stdout.on('data', data => {
console.log(`${data}`);
});
globalThis.__INTEG_TEST_SERVER_PID__ = child.pid;
child.stderr.on('data', data => {
const str = data.toString();
console.log('[server]', str);
if (str.includes(projectConfig.globals.testServerUrl)) {
setTimeout(resolve, 200);
}
});
};

4
__tests__/integration/teardown.js
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module.exports = async function (globalConfig, projectConfig) {
console.info('Stopping server.');
process.kill(globalThis.__INTEG_TEST_SERVER_PID__);
};

11
dev-server.js Normal file
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@ -0,0 +1,11 @@
require('esbuild-server')
.createServer(
{
bundle: true,
entryPoints: ['src/app.js'],
},
{
static: 'public',
}
)
.start();

5
index.js
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export { default as pan, programmaticPan } from './src/modules/pan'; export { default as pan } from './src/modules/pan.js';
export { default as zoom } from './src/modules/zoom'; export { default as zoom } from './src/modules/zoom.js';
export * as withRestore from './src/modules/with-restore';

219
jest.config.js
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/**
* For a detailed explanation regarding each configuration property, visit:
* https://jestjs.io/docs/configuration
*/
/** @type {import('jest').Config} */
const config = {
// All imported modules in your tests should be mocked automatically
// automock: false,
// Stop running tests after `n` failures
// bail: 0,
// The directory where Jest should store its cached dependency information
// cacheDirectory: "/tmp/jest_rs",
// Automatically clear mock calls, instances, contexts and results before every test
clearMocks: true,
// Indicates whether the coverage information should be collected while executing the test
// collectCoverage: false,
// An array of glob patterns indicating a set of files for which coverage information should be collected
// collectCoverageFrom: undefined,
// The directory where Jest should output its coverage files
// coverageDirectory: undefined,
// An array of regexp pattern strings used to skip coverage collection
// coveragePathIgnorePatterns: [
// "/node_modules/"
// ],
// Indicates which provider should be used to instrument code for coverage
coverageProvider: "v8",
// A list of reporter names that Jest uses when writing coverage reports
// coverageReporters: [
// "json",
// "text",
// "lcov",
// "clover"
// ],
// An object that configures minimum threshold enforcement for coverage results
// coverageThreshold: undefined,
// A path to a custom dependency extractor
// dependencyExtractor: undefined,
// Make calling deprecated APIs throw helpful error messages
// errorOnDeprecated: false,
// The default configuration for fake timers
// fakeTimers: {
// "enableGlobally": false
// },
// Force coverage collection from ignored files using an array of glob patterns
// forceCoverageMatch: [],
// A path to a module which exports an async function that is triggered once before all test suites
// globalSetup: undefined,
globalSetup: './__tests__/integration/setup.js',
// A path to a module which exports an async function that is triggered once after all test suites
// globalTeardown: undefined,
globalTeardown: './__tests__/integration/teardown.js',
// A set of global variables that need to be available in all test environments
// globals: {},
// The maximum amount of workers used to run your tests. Can be specified as
// % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as
// the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
// maxWorkers: "50%",
// An array of directory names to be searched recursively up from the requiring module's location
// moduleDirectories: [
// "node_modules"
// ],
// An array of file extensions your modules use
// moduleFileExtensions: [
// "js",
// "mjs",
// "cjs",
// "jsx",
// "ts",
// "tsx",
// "json",
// "node"
// ],
// A map from regular expressions to module names or to arrays of module
// names that allow to stub out resources with a single module
// moduleNameMapper: {},
// An array of regexp pattern strings, matched against all module paths
// before considered 'visible' to the module loader
// modulePathIgnorePatterns: [],
// Activates notifications for test results
// notify: false,
// An enum that specifies notification mode. Requires { notify: true }
// notifyMode: "failure-change",
// A preset that is used as a base for Jest's configuration
// preset: undefined,
// Run tests from one or more projects
// projects: undefined,
// Use this configuration option to add custom reporters to Jest
// reporters: undefined,
// Automatically reset mock state before every test
// resetMocks: false,
// Reset the module registry before running each individual test
// resetModules: false,
// A path to a custom resolver
// resolver: undefined,
// Automatically restore mock state and implementation before every test
// restoreMocks: false,
// The root directory that Jest should scan for tests and modules within
// rootDir: undefined,
// A list of paths to directories that Jest should use to search for files in
// roots: [
// "<rootDir>"
// ],
// Allows you to use a custom runner instead of Jest's default test runner
// runner: "jest-runner",
// The paths to modules that run some code to configure or set up the testing environment before each test
// setupFiles: [],
// A list of paths to modules that run some code to configure or set up the testing framework before each test
// setupFilesAfterEnv: [],
// The number of seconds after which a test is considered as slow and reported as such in the results.
// slowTestThreshold: 5,
// A list of paths to snapshot serializer modules Jest should use for snapshot testing
// snapshotSerializers: [],
// The test environment that will be used for testing
//testEnvironment: "jsdom",
testEnvironment: "node",
// Options that will be passed to the testEnvironment
// testEnvironmentOptions: {},
// Adds a location field to test results
// testLocationInResults: false,
// The glob patterns Jest uses to detect test files
// testMatch: [
// "**/__tests__/**/*.[jt]s?(x)",
// "**/?(*.)+(spec|test).[tj]s?(x)"
// ],
// An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
// testPathIgnorePatterns: [
// "/node_modules/"
// ],
testPathIgnorePatterns: [
"/node_modules/",
"setup.js",
"teardown.js",
],
// The regexp pattern or array of patterns that Jest uses to detect test files
// testRegex: [],
// This option allows the use of a custom results processor
// testResultsProcessor: undefined,
// This option allows use of a custom test runner
// testRunner: "jest-circus/runner",
// A map from regular expressions to paths to transformers
// transform: undefined,
// An array of regexp pattern strings that are matched against all source
// file paths, matched files will skip transformation
// transformIgnorePatterns: [
// "/node_modules/",
// "\\.pnp\\.[^\\/]+$"
// ],
// An array of regexp pattern strings that are matched against all modules
// before the module loader will automatically return a mock for them
// unmockedModulePathPatterns: undefined,
// Indicates whether each individual test should be reported during the run
// verbose: undefined,
verbose: true,
// An array of regexp patterns that are matched against all source file paths
// before re-running tests in watch mode
// watchPathIgnorePatterns: [],
// Whether to use watchman for file crawling
// watchman: true,
// Shuffle the order of the tests within a file
randomize: true,
};
console.info('Jest config file read.');
module.exports = config;

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29
package.json
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{ {
"name": "pan-zoom", "name": "pan-zoom",
"version": "0.3.1", "version": "0.2.0",
"description": "Pan/zoom SVG images in the browser",
"browser": "index.js", "browser": "index.js",
"files": [
"./src/modules"
],
"scripts": {
"test": "jest"
},
"repository": {
"type": "git",
"url": "https://git.miti.sh/ccm/pan-zoom"
},
"keywords": [
"SVG",
"pan",
"zoom"
],
"author": "Catalin Constantin Mititiuc <webdevcat@proton.me> (https://miti.sh)",
"license": "ISC",
"devDependencies": { "devDependencies": {
"esbuild": "^0.20.2", "esbuild": "^0.20.2",
"esbuild-server": "^0.3.0", "esbuild-server": "^0.3.0"
"jest": "^29.7.0", },
"selenium-webdriver": "^4.29.0" "files": [
} "./src/modules"
]
} }

2
public/assets/images/image.svg
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<?xml version="1.0" encoding="UTF-8" standalone="no"?> <?xml version="1.0" standalone="yes"?>
<svg viewBox="-200 -150 400 300" version="1.1" xmlns="http://www.w3.org/2000/svg"> <svg viewBox="-200 -150 400 300" version="1.1" xmlns="http://www.w3.org/2000/svg">
<style> <style>
circle, rect { circle, rect {

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27
server.js
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const { createServer } = require('esbuild-server');
//https://esbuild.github.io/api/#build
const buildOptions = {
bundle: true,
entryPoints: ['src/app.js'],
};
//https://github.com/oblador/esbuild-server?tab=readme-ov-file#serveroptions
const serverOptions = {
static: 'public',
};
const env = process.env.NODE_ENV === 'test' ? 'Test' : 'Development';
const server = createServer(buildOptions, serverOptions);
const buildStart = Date.now();
server
.start()
.then(() => {
console.log(`Build completed in ${Date.now() - buildStart}ms`);
})
.catch(() => {
console.error('Build failed');
});
console.log(`${env} server running at ${server.url}`);

8
src/app.js
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import zoom from './modules/zoom'; import zoom from './modules/zoom.js';
import pan from './modules/pan'; import pan from './modules/pan.js';
const optionalZoomFactor = 0.1, const optionalZoomFactor = 0.1,
object = document.querySelector('object'); object = document.querySelector('object');
@ -14,8 +14,8 @@ window.addEventListener('load', function () {
pointer = svg.querySelector('#pointer'), pointer = svg.querySelector('#pointer'),
options = { passive: false }; options = { passive: false };
svg.addEventListener('wheel', zoom(targetEl, optionalZoomFactor), options); svg.addEventListener('wheel', e => zoom(targetEl, e, optionalZoomFactor), options);
svg.addEventListener('pointerdown', pan(targetEl), options); svg.addEventListener('pointerdown', e => pan(svg, targetEl, e), options);
svg.addEventListener('pointermove', e => { svg.addEventListener('pointermove', e => {
const pt = new DOMPoint(e.clientX, e.clientY), const pt = new DOMPoint(e.clientX, e.clientY),

78
src/modules/pan.js
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@ -1,16 +1,12 @@
import { default as getComputedTransformMatrix } from './utils'; import getComputedTransformMatrix from './utils.js';
const minDistanceThreshold = 5; const minDistanceThreshold = 5;
function mainButtonPressed(e) {
return e.button === 0;
}
function distanceBetween({ x: x1, y: y1 }, { x: x2, y: y2 }) { function distanceBetween({ x: x1, y: y1 }, { x: x2, y: y2 }) {
return Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2); return Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2);
} }
function exceedsMinDistanceThreshhold(startPt, endPt) { function minDistanceThresholdIsMet(startPt, endPt) {
return distanceBetween(startPt, endPt) >= minDistanceThreshold; return distanceBetween(startPt, endPt) >= minDistanceThreshold;
} }
@ -24,71 +20,45 @@ function getTranslateMatrix(startPt, movePt) {
return translateMatrix.translate(movePt.x - startPt.x, movePt.y - startPt.y); return translateMatrix.translate(movePt.x - startPt.x, movePt.y - startPt.y);
} }
function getTransformMatrices(el) { export default function (svg, el, e) {
return { e.preventDefault();
computed: getComputedTransformMatrix(el),
inverseScreen: el.getScreenCTM().inverse()
};
}
function clientToSvgPt(e, inverseScreenMtx, pt = new DOMPoint()) { const mtx = getComputedTransformMatrix(el),
pt.x = e.clientX; inverseScreenCTM = el.getScreenCTM().inverse();
pt.y = e.clientY;
return pt.matrixTransform(inverseScreenMtx);
}
function setTransform(el, computedMtx, startPt, endPt) { let startPt = new DOMPoint(e.clientX, e.clientY),
const translateMtx = getTranslateMatrix(startPt, endPt); movePt = new DOMPoint(),
const transformMtx = computedMtx.multiply(translateMtx); isPanning = false;
el.style.transform = transformMtx;
}
export function programmaticPan(el, from, to) {
const matrices = getTransformMatrices(el);
const startPt = clientToSvgPt(from, matrices.inverseScreen);
const endPt = clientToSvgPt(to, matrices.inverseScreen);
el.style.transition = 'transform 0.5s';
setTransform(el, matrices.computed, startPt, endPt);
el.addEventListener('transitionend', () => el.style.transition = '', { once: true });
}
export default function (el) {
let matrices, startPt, movePt, isPanning;
function pointerMove(e) { function pointerMove(e) {
movePt.x = e.clientX; movePt.x = e.clientX;
movePt.y = e.clientY; movePt.y = e.clientY;
if (!isPanning && exceedsMinDistanceThreshhold(startPt, movePt)) { if (!isPanning && minDistanceThresholdIsMet(startPt, movePt)) {
isPanning = true; isPanning = true;
startPt = clientToSvgPt(e, matrices.inverseScreen, startPt); e.target.setPointerCapture(e.pointerId);
startPt.x = e.clientX;
startPt.y = e.clientY;
startPt = startPt.matrixTransform(inverseScreenCTM);
stopEventPropagationToChildren(el, 'click'); stopEventPropagationToChildren(el, 'click');
} }
if (isPanning) { if (isPanning) {
movePt = clientToSvgPt(e, matrices.inverseScreen, movePt); movePt.x = e.clientX;
setTransform(el, matrices.computed, startPt, movePt); movePt.y = e.clientY;
movePt = movePt.matrixTransform(inverseScreenCTM);
el.style.transform = mtx.multiply(getTranslateMatrix(startPt, movePt));
} }
} }
return function(e) { svg.addEventListener('pointermove', pointerMove);
if (!mainButtonPressed(e)) return;
e.preventDefault();
e.target.setPointerCapture(e.pointerId);
isPanning = false; svg.addEventListener(
matrices = getTransformMatrices(el);
startPt = new DOMPoint(e.clientX, e.clientY);
movePt = new DOMPoint();
this.addEventListener('pointermove', pointerMove);
this.addEventListener(
'pointerup', 'pointerup',
() => this.removeEventListener('pointermove', pointerMove), () => svg.removeEventListener('pointermove', pointerMove),
{ once: true } { once: true }
); );
} }
}

36
src/modules/with-restore.js
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import zoom from './zoom';
import pan from './pan';
const storageKey = "pan-zoom";
const zoomFactor = 0.25;
function restorePanZoomVal(el) {
const storedPanZoomVal = localStorage.getItem(storageKey);
if (storedPanZoomVal) el.style.transform = storedPanZoomVal;
}
function addEventListeners(svg, el) {
svg.addEventListener("wheel", zoom(el, zoomFactor), { passive: false });
svg.addEventListener("pointerdown", pan(el), { passive: false });
}
function storePanZoomVal(transformMatrix) {
localStorage.setItem(storageKey, transformMatrix);
}
function observePanZoomChanges(el) {
const observer = new MutationObserver(() =>
storePanZoomVal(el.style.transform),
);
observer.observe(el, { attributeFilter: ["style"] });
}
export function start(svg, selector) {
const targetEl = svg.querySelector(selector);
restorePanZoomVal(targetEl);
addEventListeners(svg, targetEl);
observePanZoomChanges(targetEl);
}

68
src/modules/zoom.js
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import { default as getComputedTransformMatrix } from './utils'; import getComputedTransformMatrix from './utils.js';
function zoomIn(deltaY) { function zoomIn(deltaY) {
return deltaY < 0; return deltaY < 0;
} }
function getScale(deltaY, factor) { function getScale(e, factor) {
const outMult = 1 - factor; return zoomIn(e.deltaY) ? 1 + factor : 1 - factor;
const inMult = 1 + factor / outMult
return zoomIn(deltaY) ? inMult : outMult;
} }
function getTranslateMatrix(el, clientX, clientY) { function getFocalPointBeforeTransform(el, e, inverseScreenCTM) {
const inverseScreenCTM = el.getScreenCTM().inverse(); const { x, y, width, height } = el.getBoundingClientRect(),
const translateMtx = new DOMMatrix(); pointer = (new DOMPoint(e.clientX, e.clientY)).matrixTransform(inverseScreenCTM),
const pointer = new DOMPoint(clientX, clientY) origin = (new DOMPoint(x, y)).matrixTransform(inverseScreenCTM),
const { x, y } = pointer.matrixTransform(inverseScreenCTM); terminus = (new DOMPoint(x + width, y + height)).matrixTransform(inverseScreenCTM);
return translateMtx.translate(x, y); return {
x: pointer.x,
y: pointer.y,
relativeToImageSize: {
x: (pointer.x - origin.x) / (terminus.x - origin.x),
y: (pointer.y - origin.y) / (terminus.y - origin.y)
}
};
} }
function setTransform(el, computedMtx, translateMtx, scale) { function getFocalPointAfterTransform(el, fpBeforeTrans, inverseScreenCTM) {
const transformMtx = const { x, y, width, height } = el.getBoundingClientRect(),
computedMtx.multiply(translateMtx).scale(scale).multiply(translateMtx.inverse()); origin = (new DOMPoint(x, y)).matrixTransform(inverseScreenCTM),
terminus = (new DOMPoint(x + width, y + height)).matrixTransform(inverseScreenCTM),
relativeFocalPoint = fpBeforeTrans.relativeToImageSize;
el.style.transform = transformMtx; return {
x: origin.x + (terminus.x - origin.x) * relativeFocalPoint.x,
y: origin.y + (terminus.y - origin.y) * relativeFocalPoint.y
};
} }
export default function (el, factor = 0.1) { function getTranslateMatrix(el, e, scaleMatrix) {
return e => { const inverseScreenCTM = el.getScreenCTM().inverse(),
fpBeforeTrans = getFocalPointBeforeTransform(el, e, inverseScreenCTM);
el.style.transform = scaleMatrix;
const fpAfterTrans = getFocalPointAfterTransform(el, fpBeforeTrans, inverseScreenCTM),
translateMatrix = new DOMMatrix();
return translateMatrix.translate(
fpBeforeTrans.x - fpAfterTrans.x,
fpBeforeTrans.y - fpAfterTrans.y
);
}
export default function (el, e, factor = 0.1) {
e.preventDefault(); e.preventDefault();
const computedMtx = getComputedTransformMatrix(el); const mtx = getComputedTransformMatrix(el),
const scale = getScale(e.deltaY, factor); scale = getScale(e, factor),
const translateMtx = getTranslateMatrix(el, e.clientX, e.clientY); transMtx = getTranslateMatrix(el, e, mtx.scale(scale));
setTransform(el, computedMtx, translateMtx, scale); el.style.transform = mtx.multiply(transMtx).scale(scale);
}
} }