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Transform.svelte
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Transform.svelte
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<script lang="ts">
import { types } from '../../theatre'
import type { ISheetObject, UnknownShorthandCompoundProps } from '@theatre/core'
import type { IScrub } from '@theatre/studio'
import { T, watch, type CurrentWritable } from '@threlte/core'
import { TransformControls } from '@threlte/extras'
import { onMount, type ComponentProps } from 'svelte'
import { Group } from 'three'
import type { TransformControls as TC } from 'three/examples/jsm/controls/TransformControls.js'
import { RAD2DEG } from 'three/src/math/MathUtils.js'
import { useStudio } from '../../studio/useStudio'
import { getDefaultTransformer } from '../transfomers/getDefaultTransformer'
import type Transform from './Transform.svelte'
type Label = $$Generic<string | undefined>
type Props = ComponentProps<Transform<Label>>
export let label: Label = undefined as Label
export let key: Props['key'] = undefined as Props['key']
export let mode: Props['mode'] = 'translate' as Props['mode']
export let space: Props['space'] = undefined as Props['space']
export let translationSnap: Props['translationSnap'] = undefined as Props['translationSnap']
export let rotationSnap: Props['rotationSnap'] = undefined as Props['rotationSnap']
export let scaleSnap: Props['scaleSnap'] = undefined as Props['scaleSnap']
/** @package */
export let sheetObject: CurrentWritable<ISheetObject>
/** @package */
export let addProps: (props: UnknownShorthandCompoundProps) => void
/** @package */
export let removeProps: (propNames: string[]) => void
let controls: TC | undefined
$: if (controls) {
if (translationSnap) {
controls.setTranslationSnap(translationSnap)
} else {
controls.setTranslationSnap(null)
}
if (rotationSnap) {
controls.setRotationSnap(rotationSnap)
} else {
controls.setRotationSnap(null)
}
if (scaleSnap) {
controls.setScaleSnap(scaleSnap)
} else {
controls.setScaleSnap(null)
}
}
const group = new Group()
const positionTransformer = getDefaultTransformer(group, 'position', 'position')
const rotationTransformer = getDefaultTransformer(group, 'rotation', 'rotation')
const scaleTransformer = getDefaultTransformer(group, 'scale', 'scale')
const initTransform = () => {
const positionProp = positionTransformer.transform(group.position)
const rotationProp = rotationTransformer.transform(group.rotation)
const scaleProp = scaleTransformer.transform(group.scale)
if (key) {
addProps({
[key]: types.compound(
{
position: positionProp,
rotation: rotationProp,
scale: scaleProp
},
{
label: label ?? key
}
)
})
} else {
addProps({
position: positionProp,
rotation: rotationProp,
scale: scaleProp
})
}
}
watch([sheetObject], ([sheetObject]) => {
return sheetObject?.onValuesChange((values) => {
let object = values
if (key) {
if (!values[key]) return
object = values[key]
} else {
if (!values.position || !values.rotation || !values.scale) return
}
// sanity check
if (!object) return
positionTransformer.apply(group, 'position', object.position)
rotationTransformer.apply(group, 'rotation', object.rotation)
scaleTransformer.apply(group, 'scale', object.scale)
})
})
onMount(() => {
initTransform()
return () => {
removeProps(key ? [key] : ['position', 'rotation', 'scale'])
}
})
const studio = useStudio()
let scrub: IScrub | undefined
let isSelected = false
watch([studio], ([studio]) => {
return studio?.onSelectionChange((selection) => {
if (!$sheetObject) return
isSelected = selection.includes($sheetObject)
})
})
const onMouseDown = () => {
if (!studio) return
if (scrub) return
scrub = $studio?.scrub()
}
const onChange = () => {
if (!scrub) return
scrub.capture((api) => {
if (!$sheetObject) return
const baseTarget = key ? $sheetObject.props[key] : $sheetObject.props
api.set(baseTarget.position as any, {
...group.position
})
api.set(baseTarget.rotation as any, {
x: group.rotation.x * RAD2DEG,
y: group.rotation.y * RAD2DEG,
z: group.rotation.z * RAD2DEG
})
api.set(baseTarget.scale as any, {
...group.scale
})
})
}
const onMouseUp = () => {
if (!scrub) return
scrub.commit()
scrub = undefined
}
const groupRef = group as any
</script>
<T
is={groupRef}
let:ref
>
{#if isSelected}
<TransformControls
object={ref}
{mode}
{space}
bind:controls
on:mouseDown={onMouseDown}
on:objectChange={onChange}
on:mouseUp={onMouseUp}
/>
{/if}
<slot />
</T>