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fix(lib-classifier): canvas context for SVG drawing tools #6491

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fix(lib-classifier): canvas context for SVG drawing tools #6491

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a7848eb
fix(lib-classifier): canvas context for SVG drawing tools
eatyourgreens Nov 23, 2024
6eacb2a
DRY up SVG event-handling functions
eatyourgreens Nov 23, 2024
5219203
revert changes to SingleImageViewer
eatyourgreens Dec 6, 2024
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55 changes: 12 additions & 43 deletions ...nents/Classifier/components/SubjectViewer/components/InteractionLayer/InteractionLayer.js
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Original file line number Diff line number Diff line change
@@ -1,7 +1,10 @@
import cuid from 'cuid'
import PropTypes from 'prop-types'
import { useRef, useState } from 'react';
import { useContext, useRef, useState } from 'react';
import styled, { css } from 'styled-components'

import SVGContext from '@plugins/drawingTools/shared/SVGContext'
import { convertEvent } from '@plugins/drawingTools/components/draggable/draggable'
import DrawingToolMarks from './components/DrawingToolMarks'
import TranscribedLines from './components/TranscribedLines'
import SubTaskPopup from './components/SubTaskPopup'
Expand Down Expand Up @@ -43,7 +46,9 @@ function InteractionLayer({
duration
}) {
const [creating, setCreating] = useState(false)
const canvas = useRef()
const svgContext = useContext(SVGContext)
const canvasRef = useRef()
svgContext.canvas = canvasRef.current
Comment on lines +49 to +51
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@eatyourgreens eatyourgreens Nov 23, 2024 •
edited
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I'm not 100% sure if this is the best way to update a reference within a context object, but it works in Chrome, Safari, and Firefox.

SVGContext.canvas is a reference to the element that the draggable decorator (and drawing tools in general) will use to calculate the screen CTM for pointer interactions (ie. to get SVG coordinates from pointer coordinates.)


if (creating && !activeMark) {
setCreating(false)
Expand All @@ -54,42 +59,6 @@ function InteractionLayer({
setActiveMark(undefined)
}

function convertEvent(event) {
const type = event.type

const svgEventOffset = getEventOffset(event)

const svgCoordinateEvent = {
pointerId: event.pointerId,
type,
x: svgEventOffset.x,
y: svgEventOffset.y
}

return svgCoordinateEvent
}

function createPoint(event) {
const { clientX, clientY } = event
// SVG 2 uses DOMPoint
if (window.DOMPointReadOnly) {
return new DOMPointReadOnly(clientX, clientY)
}
// jsdom doesn't support SVG
return {
x: clientX,
y: clientY
}
}

function getEventOffset(event) {
const svgPoint = createPoint(event)
const svgEventOffset = svgPoint.matrixTransform
? svgPoint.matrixTransform(canvas.current?.getScreenCTM().inverse())
: svgPoint
return svgEventOffset
}

function createMark(event) {
const timeStamp = getFixedNumber(played, 5)
const mark = activeTool.createMark({
Expand All @@ -99,7 +68,7 @@ function InteractionLayer({
toolIndex: activeToolIndex
})

mark.initialPosition(convertEvent(event))
mark.initialPosition(convertEvent(event, canvasRef.current))
setActiveMark(mark)
setCreating(true)
mark.setSubTaskVisibility(false)
Expand All @@ -124,7 +93,7 @@ function InteractionLayer({
}

if (creating) {
activeTool?.handlePointerDown?.(convertEvent(event), activeMark)
activeTool?.handlePointerDown?.(convertEvent(event, canvasRef.current), activeMark)
if (activeMark.finished) onFinish(event)
return true
}
Expand All @@ -136,7 +105,7 @@ function InteractionLayer({
function onPointerMove(event) {
cancelEvent(event)
if (creating) {
activeTool?.handlePointerMove?.(convertEvent(event), activeMark)
activeTool?.handlePointerMove?.(convertEvent(event, canvasRef.current), activeMark)
}
}

Expand All @@ -149,7 +118,7 @@ function InteractionLayer({
function onPointerUp(event) {
cancelEvent(event)
if (creating) {
activeTool?.handlePointerUp?.(convertEvent(event), activeMark)
activeTool?.handlePointerUp?.(convertEvent(event, canvasRef.current), activeMark)
if (activeMark.finished) onFinish(event)
}
}
Expand All @@ -165,7 +134,7 @@ function InteractionLayer({
return (
<>
<DrawingCanvas
ref={canvas}
ref={canvasRef}
disabled={disabled || move}
pointerEvents={move ? 'none' : 'all'}
width={width}
Expand Down
7 changes: 4 additions & 3 deletions packages/lib-classifier/src/plugins/drawingTools/components/draggable/draggable.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,13 +16,14 @@ function createPoint(event) {

function getEventOffset(event, canvas) {
const svgPoint = createPoint(event)
const svgEventOffset = svgPoint.matrixTransform
? svgPoint.matrixTransform(canvas.getScreenCTM().inverse())
const ctm = canvas?.getScreenCTM()
const svgEventOffset = ctm && svgPoint.matrixTransform
? svgPoint.matrixTransform(ctm.inverse())
: svgPoint
return svgEventOffset
}

function convertEvent(event, canvas) {
export function convertEvent(event, canvas) {
const svgEventOffset = getEventOffset(event, canvas)
const svgCoordinateEvent = {
type: event.type,
Expand Down
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