iwmlib/lib/pixi/stylus.js

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/* eslint-disable no-undef */
/* eslint-disable no-console */
import Events from '../events.js'
import { Angle } from '../utils.js'
class StylusCommand extends Object {
constructor() {
super()
}
do(stylus) {
stylus.commandStack.push(this)
}
undo(stylus) {
stylus.undoCommandStack.push(this)
}
redo(stylus) {
this.do(stylus)
}
}
class StrokeCommand extends StylusCommand {
constructor(stroke) {
super()
this.stroke = stroke
}
do(stylus) {
if (this.stroke.length > 0) {
super.do(stylus)
stylus.stroke = []
stylus.strokes.push(this.stroke)
stylus.redraw()
stylus.changed()
}
}
undo(stylus) {
if (this.stroke.length > 0) {
super.undo(stylus)
stylus.strokes.pop()
stylus.redraw()
stylus.changed()
}
}
}
class ClearCommand extends StylusCommand {
do(stylus) {
// Clears the command stack
stylus.commandStack = []
super.do(stylus)
this.strokes = stylus.strokes
stylus.stroke = []
stylus.strokes = []
stylus.redraw()
stylus.changed()
}
undo(stylus) {
//super.undo(stylus) // Clear all is not redoable
stylus.stroke = []
stylus.strokes = this.strokes
stylus.redraw()
stylus.changed()
}
}
export default class Stylus extends PIXI.Graphics {
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constructor({
width = window.innerWidth,
height = window.innerHeight,
interactive = true,
color = 0x000000,
tiltX = 0,
tiltY = 0,
backgroundAlpha = 1,
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backgroundFill = 0xffffff,
colorAlpha = 1,
captureEvents = true,
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acceptMouseEvents = true
} = {}) {
super()
this.activePointers = 0
this.wantedWidth = width
this.wantedHeight = height
this.backgroundAlpha = backgroundAlpha
this.backgroundFill = backgroundFill
this.colorAlpha = colorAlpha
this.color = color
this.interactive = interactive
this.debug = false
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this.tiltX = tiltX // degrees -90 ... 90
this.tiltY = tiltY // degrees -90 ... 90
this.captureEvents = captureEvents
this.commandStack = []
this.undoCommandStack = []
this.strokes = []
this.stroke = []
this.minStrokeLength = 4
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if (captureEvents) this.registerEventHandler(acceptMouseEvents)
this.drawBackground()
}
drawBackground() {
this.clear()
this.beginFill(this.backgroundFill, this.backgroundAlpha)
this.drawRect(0, 0, this.wantedWidth, this.wantedHeight)
this.endFill()
}
touchToPoint(t) {
return { x: t.clientX, y: t.clientY }
}
isStylusPointer(event) {
let identifier = event.data.identifier
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if (typeof event.data.originalEvent.changedTouches !== 'undefined') {
for (let touch of event.data.originalEvent.changedTouches) {
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if (
touch.identifier === identifier &&
touch.touchType === 'stylus'
) {
this.tiltX = Angle.radian2degree(touch.azimuthAngle)
this.tiltY = 90.0 - Angle.radian2degree(touch.altitudeAngle)
return true
}
}
}
// UO: Not tested since the Sprot delivered "mouse" events to Chrome
if (event.data.originalEvent.pointerType === 'pen') {
this.tiltX = event.data.originalEvent.tiltX
this.tiltY = event.data.originalEvent.tiltY
return true
}
return false
}
isStylusTouch(event) {
let identifier = event.data.identifier
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if (typeof event.data.originalEvent.changedTouches !== 'undefined') {
for (let touch of event.data.originalEvent.changedTouches) {
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if (
touch.identifier === identifier &&
touch.pointerType === 'touch'
) {
return true
}
}
}
return false
}
getPointerID(event) {
let identifier = event.data.identifier
for (let touch of event.data.originalEvent.changedTouches) {
if (touch.identifier === identifier) {
return touch.pointerId
}
}
}
singlePointer() {
return this.activePointers == 1
}
registerEventHandler() {
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window.addEventListener('keydown', e => {
switch (e.keyCode) {
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case 38: // up arrow
this.tiltX += 5
break
case 40: // down arrow
this.tiltX -= 5
break
case 37: // left arrow
this.tiltY -= 5
break
case 39: // right arrow
this.tiltY += 5
break
}
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if (this.debug)
console.log('keydown', e.keyCode, this.tiltX, this.tiltY)
})
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this.on('pointerdown', e => {
if (this.debug) console.log('pointerdown', e)
if (this.eventInside(e)) {
this.activePointers += 1
if (this.singlePointer()) {
this.startStroke(this.toStroke(e))
}
}
})
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this.on('pointermove', e => {
if (
Events.isPointerDown(e.data.originalEvent) ||
this.isStylusPointer(e) ||
this.isStylusTouch(e)
) {
if (this.debug)
console.log('pointermove', e, this.eventInside(e))
if (this.eventInside(e) && this.singlePointer())
this.moveStroke(this.toStroke(e))
}
})
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this.on('pointerup', e => {
if (this.eventInside(e)) {
if (this.activePointers > 0) {
this.activePointers -= 1
this.endStroke(this.toStroke(e))
}
}
if (this.debug) console.log('pointerup', this.activePointers)
})
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this.on('pointerleave', e => {
if (this.activePointers > 0) {
this.activePointers -= 1
}
this.endStroke(this.toStroke(e))
})
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this.on('pointercancel', e => {
if (this.activePointers > 0) {
this.activePointers -= 1
}
this.endStroke(this.toStroke(e))
})
}
undoable() {
return this.commandStack.length > 0
}
redoable() {
return this.undoCommandStack.length > 0
}
undo() {
if (this.undoable()) {
let cmd = this.commandStack.pop()
cmd.undo(this)
}
}
redo() {
if (this.redoable()) {
let cmd = this.undoCommandStack.pop()
cmd.redo(this)
}
}
eventInside(event) {
let local = this.toLocal(event.data.global)
for (let child of this.children) {
let r = child.getBounds()
if (r.contains(local.x, local.y)) {
console.log('Child touched')
return false
}
}
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if (local.x < 0 || local.x > this.wantedWidth) return false
if (local.y < 0 || local.y > this.wantedHeight) return false
event.stopPropagation()
// if (this.debug) console.log('stopPropagation', event)
if (event.data.originalEvent.claimedByScatter) {
return false
}
return true
}
toLocalPoint(event) {
return this.toLocal(event.data.global)
}
toStroke(event) {
let local = this.toLocalPoint(event)
let x = Math.max(0, Math.min(local.x, this.wantedWidth))
let y = Math.max(0, Math.min(local.y, this.wantedHeight))
let desc = {
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x,
y,
pressure: event.pressure || null,
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tiltX: this.tiltX,
tiltY: this.tiltY,
color: this.color
}
return desc
}
startStroke(info) {
this.stroke = [info]
this.redraw()
}
moveStroke(info) {
this.stroke.push(info)
this.redraw()
}
// eslint-disable-next-line no-unused-vars
endStroke(info) {
if (this.stroke.length >= this.minStrokeLength) {
let cmd = new StrokeCommand(this.stroke)
cmd.do(this)
}
}
tiltToLineWidth(value) {
return Math.round(Math.abs(value / 10) + 1)
}
drawStroke(stroke) {
if (stroke.length) {
let start = stroke[0]
this.beginFill(0, 0)
this.moveTo(start.x, start.y)
for (let i = 1; i < stroke.length; i++) {
let info = stroke[i]
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this.lineStyle(
this.tiltToLineWidth(info.tiltY),
info.color,
this.colorAlpha
)
this.lineTo(info.x, info.y)
}
this.endFill()
}
}
drawTouch(point) {
this.beginFill(0, 0)
this.drawCircle(point.x, point.y, 22)
this.endFill()
}
drawStrokes() {
this.drawBackground()
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this.lineStyle(1.0, 0xff0000, 1)
for (let stroke of this.iterStrokes()) {
this.drawStroke(stroke)
}
}
redraw() {
this.drawStrokes()
}
// Can be overwritten if different levels of strokes are necessary
*iterStrokes() {
for (let stroke of this.strokes) {
yield stroke
}
yield this.stroke
}
changed() {
// Can be overwritten
}
clearAll() {
let cmd = new ClearCommand()
cmd.do(this)
}
normalizeInfo(info) {
let { x, y, pressure, tiltX, tiltY, color } = info
x /= this.wantedWidth
y /= this.wantedHeight
return { x, y, pressure, tiltX, tiltY, color }
}
denormalizeInfo(info) {
let { x, y, pressure, tiltX, tiltY, color } = info
x = x * this.wantedWidth
y = y * this.wantedHeight
return { x, y, pressure, tiltX, tiltY, color }
}
// Convert strokes into an object that can be stored in an Indexed DB.
// Returns normalized strokes
toObject() {
let result = []
for (let stroke of this.strokes) {
let normalized = []
for (let info of stroke) {
normalized.push(this.normalizeInfo(info))
}
result.push(normalized)
}
return result
}
// Read normalized strokes from an object from an Indexed DB.
fromObject(normalizedStrokes) {
this.strokes = []
for (let stroke of normalizedStrokes) {
let denormalized = []
for (let info of stroke) {
denormalized.push(this.denormalizeInfo(info))
}
this.strokes.push(denormalized)
}
}
// Convert strokes into a JSON object that can be stored in an Indexed DB
toJSON() {
return JSON.stringify(this.toObject())
}
// Convert strokes from a JSON
fromJSON(json) {
this.fromObject(JSON.parse(json))
}
// Returns a set of used colors
usedColors() {
let used = new Set()
for (let info of this.stroke) {
used.add(info.color)
}
for (let stroke of this.strokes) {
for (let info of stroke) {
used.add(info.color)
}
}
return used.values()
}
}