| index : pan-zoom | |
| SVG pan/zoom library. |
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| author | Catalin Mititiuc <webdevcat@proton.me> | 2025-03-18 13:43:26 -0700 |
|---|---|---|
| committer | Catalin Mititiuc <webdevcat@proton.me> | 2025-03-18 13:47:07 -0700 |
| commit | 25eca15a3007c76c4e444b859683feb29edfa183 (patch) | |
| tree | d0a867be54ab95f5e138cec9df662fa0ba450544 /src/modules | |
| parent | 99d137cc0937c0342fc1076eafe609c8aa370087 (diff) | |
WIP: translate an object to zoomed position without scalingcm-pan-not-zoom
Diffstat (limited to 'src/modules')
| -rw-r--r-- | src/modules/pan.js | 6 | ||||
| -rw-r--r-- | src/modules/utils.js | 27 | ||||
| -rw-r--r-- | src/modules/zoom.js | 6 |
3 files changed, 37 insertions, 2 deletions
diff --git a/src/modules/pan.js b/src/modules/pan.js index bf842bd..8be3cb9 100644 --- a/src/modules/pan.js +++ b/src/modules/pan.js @@ -1,4 +1,4 @@ -import { default as getComputedTransformMatrix } from './utils'; +import { default as getComputedTransformMatrix, track, getTracked } from './utils'; const minDistanceThreshold = 5; @@ -41,9 +41,13 @@ function setTransform(el, computedMtx, startPt, endPt) { const translateMtx = getTranslateMatrix(startPt, endPt); const transformMtx = computedMtx.multiply(translateMtx); + groups.forEach(([z, p]) => track(z, p, transformMtx)); + el.style.transform = transformMtx; } +const groups = getTracked(document.querySelectorAll('svg g[class] use')); + export function programmaticPan(el, from, to) { const matrices = getTransformMatrices(el); const startPt = clientToSvgPt(from, matrices.inverseScreen); diff --git a/src/modules/utils.js b/src/modules/utils.js index e7f5c55..ae63b74 100644 --- a/src/modules/utils.js +++ b/src/modules/utils.js @@ -1,5 +1,32 @@ const digits = /-?\d+\.?\d*/g; +export function extractNum(string) { + return string.replace(/\D/g,''); +} + +export function getTracked(trackedAndTrackerEls) { + const sorted = [...trackedAndTrackerEls] + .sort((a, b) => a.id < b.id || extractNum(a.id) <= extractNum(b.id)); + + const groups = []; + const els = sorted.slice(); + + while (els.length) { + groups.push([els.pop(), els.pop()]); + } + + return groups; +} + +export function track(targetEl, trackingEl, transformMtx) { + let x = targetEl.getAttributeNS(null, 'x'); + let y = targetEl.getAttributeNS(null, 'y'); + let ptBefore = new DOMPoint(x, y); + let ptAfter = ptBefore.matrixTransform(transformMtx); + trackingEl.setAttributeNS(null, 'x', ptAfter.x); + trackingEl.setAttributeNS(null, 'y', ptAfter.y); +} + export default function getComputedTransformMatrix(el) { const matrixSequence = getComputedStyle(el).transform.match(digits), identityMatrix = ''; diff --git a/src/modules/zoom.js b/src/modules/zoom.js index 1455cb4..69652c0 100644 --- a/src/modules/zoom.js +++ b/src/modules/zoom.js @@ -1,4 +1,4 @@ -import { default as getComputedTransformMatrix } from './utils'; +import { default as getComputedTransformMatrix, extractNum, track, getTracked } from './utils'; function zoomIn(deltaY) { return deltaY < 0; @@ -24,9 +24,13 @@ function setTransform(el, computedMtx, translateMtx, scale) { const transformMtx = computedMtx.multiply(translateMtx).scale(scale).multiply(translateMtx.inverse()); + groups.forEach(([z, p]) => track(z, p, transformMtx)); + el.style.transform = transformMtx; } +const groups = getTracked(document.querySelectorAll('svg g[class] use')); + export default function (el, factor = 0.1) { return e => { e.preventDefault(); |