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script.js
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script.js
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import { getStroke, getStrokeOutlinePoints } from "./libraries/perfect-freehand.js"
//========//
// USEFUL //
//========//
const clamp = (n, min, max) => {
if (n < min) return min
if (n > max) return max
return n
}
//=========//
// PAINTER //
//=========//
const makePainter = ({
sources,
offsetX = 0,
offsetY = 0,
centerX = 0.5,
centerY = 0.5,
scale = 1.0,
speed = 0.1,
maxSpeed = speed,
minSpeed = maxSpeed * 0.3,
acceleration = 0.001,
dr = 0.05,
frameRate = 24,
speedR = 1.0,
idleFadePower = 1.0,
idleFrequency = { x: 500, y: 750 },
strokeOptions = {},
} = {}) => {
const images = sources.map(() => {
const image = document.createElementNS("http://www.w3.org/2000/svg", "image")
image.style.visibility = "hidden"
return image
})
const ready = (async () => {
const c = document.createElement("canvas");
const ctx = c.getContext("2d");
// A promise that awaits the loading of all resources before resolving.
await Promise.all(sources.map(async (src, i) => {
const img = new Image()
img.crossOrigin = ""
img.src = src
img.loading = "eager"
if (!img.complete) {
await new Promise((resolve, reject) => {
img.addEventListener('load', () => {
c.width = img.naturalWidth; // update canvas size to match image
c.height = img.naturalHeight;
ctx.drawImage(img, 0, 0); // draw in image
const image = images[i]
image.setAttribute("width", img.width * scale)
image.setAttribute("height", img.height * scale)
image.setAttribute('href', c.toDataURL()) // update image with new data
resolve()
})
img.addEventListener('error', reject)
})
}
}))
})()
const painter = {
images,
frame: 0,
frameRate,
age: 0,
scale,
x: 0,
y: 0,
dx: 0,
dy: 0,
dr,
offsetX,
offsetY,
centerX,
centerY,
speed,
maxSpeed,
minSpeed,
acceleration,
isPainting: false,
brushdx: 0,
brushdy: 0,
r: 0,
targetR: 0,
speedR,
idleFadePower,
idleFrequency,
strokeOptions,
ready,
}
return painter
}
const drawPainter = (painter) => {
const {images, frame, r} = painter
const image = images[frame]
const width = image.width.baseVal.value
const height = image.height.baseVal.value
const cx = painter.x + width * painter.centerX
const cy = painter.y + height * painter.centerY
image.setAttribute("x", cx - width/2)
image.setAttribute("y", cy - height/2)
image.setAttribute("transform", `rotate(${r * 180 / Math.PI}, ${cx}, ${cy})`)
}
// https://stackoverflow.com/questions/17410809/how-to-calculate-rotation-in-2d-in-javascript
function rotatePoint (cx, cy, x, y, angle) {
const cos = Math.cos(-angle)
const sin = Math.sin(-angle)
const nx = (cos * (x - cx)) + (sin * (y - cy)) + cx
const ny = (cos * (y - cy)) - (sin * (x - cx)) + cy
return {x: nx, y: ny}
}
const getBrushPosition = (painter) => {
const image = painter.images[painter.frame]
const width = image.width.baseVal.value
const height = image.height.baseVal.value
const x = painter.x - painter.offsetX * painter.scale
const y = painter.y - painter.offsetY * painter.scale
const cx = painter.x + width*painter.centerX
const cy = painter.y + height*painter.centerY
return rotatePoint(cx, cy, x, y, painter.r)
}
let lastBrushWasTouch = false
let restingPosition = [0, 0]
on.mousemove(() => restingPosition = Mouse.position.map(v => v * 1 / (window.shrinkScore)))
on.touchstart(e => e.preventDefault(), {passive: false})
const updatePainter = (layers, strokeHistoryContainer, currentStrokeContainer, painter, paths, colour) => {
if (painter.isPainting) {
painter.idleFadePower -= 0.01
} else {
painter.idleFadePower += 0.01
}
painter.idleFadePower = clamp(painter.idleFadePower, 0.0, 1.0)
painter.age++
if (painter.age > 255) {
painter.age = 0
}
if (painter.age % (60 / painter.frameRate) === 0) {
painter.images[painter.frame].style.visibility = "hidden"
painter.frame++
if (painter.frame >= painter.images.length) {
painter.frame = 0
}
painter.images[painter.frame].style.visibility = "visible"
}
const acceleration = painter.acceleration * (Mouse.Right? -1 : 1)
painter.speed = clamp(painter.speed + acceleration, painter.minSpeed, painter.maxSpeed)
const brush = getBrushPosition(painter)
let [mx, my] = restingPosition
const touch = Touches.first
if (touch) {
lastBrushWasTouch = true
restingPosition = touch.position.map(v => v * 1 / (window.shrinkScore))
;[mx, my] = restingPosition
}
if (Mouse.Left) lastBrushWasTouch = false
if (!lastBrushWasTouch && mx !== undefined) {
my -= (layers.last.height.baseVal.value - my)/3
mx -= (layers.last.width.baseVal.value - mx)/3
} else if (mx !== undefined) {
my -= 200
mx -= 20
}
const mouse = {x: mx, y: my}
if (Mouse.Left || touch) {
if (!painter.isPainting) {
let isCloseEnough = true
if (touch) {
const displacement = [mx - painter.x, my - painter.y]
const distance = Math.hypot(...displacement)
if (distance > 50) isCloseEnough = false
}
if (isCloseEnough) {
painter.isPainting = true
const path = []
const element = document.createElementNS("http://www.w3.org/2000/svg", "path")
path.element = element
paths.push(path)
path.colour = colour
path.push([brush.x, brush.y])
const stroke = getStroke(path, painter.strokeOptions)
element.setAttribute("d", getSvgPathFromStroke(stroke))
element.setAttribute("fill", path.colour)
currentStrokeContainer.appendChild(element)
}
}
} else if (painter.isPainting) {
painter.isPainting = false
strokeHistoryContainer.appendChild(paths.last.element)
}
for (const position of ["x", "y"]) {
const speed = `d${position}`
if (mouse[position] === undefined) continue
painter[speed] = (mouse[position] - painter[position]) * painter.speed
painter[position] += painter[speed]
}
global.painter.x += (2*Math.sin(performance.now() / global.painter.idleFrequency.x)) * global.painter.idleFadePower
global.painter.y += (2*Math.sin(performance.now() / global.painter.idleFrequency.y)) * global.painter.idleFadePower
painter.targetR = painter.dx * painter.dr + painter.dy * -painter.dr
painter.r += (painter.targetR - painter.r) * painter.speedR
const newBrush = getBrushPosition(painter)
painter.brushdx = newBrush.x - brush.x
painter.brushdy = newBrush.y - brush.y
if (painter.isPainting) {
const path = paths.last
const last = path.last
const secondLast = path[path.length - 2]
if (secondLast === undefined || last === undefined) {
path.push([newBrush.x, newBrush.y])
const stroke = getStroke(path, painter.strokeOptions)
path.element.setAttribute("d", getSvgPathFromStroke(stroke))
return
}
//const displacementLast = [newBrush.x - last[0], newBrush.y - last[1]]
const displacementSecondLast = [newBrush.x - secondLast[0], newBrush.y - secondLast[1]]
//const distanceLast = Math.hypot(...displacementLast)
const distanceSecondLast = Math.hypot(...displacementSecondLast)
if (distanceSecondLast <= 5.0) {
path[path.length-1] = [newBrush.x, newBrush.y]
const stroke = getStroke(path, painter.strokeOptions)
path.element.setAttribute("d", getSvgPathFromStroke(stroke))
} else {
path.push([newBrush.x, newBrush.y])
const stroke = getStroke(path, painter.strokeOptions)
path.element.setAttribute("d", getSvgPathFromStroke(stroke))
}
}
}
//======//
// PATH //
//======//
function getSvgPathFromStroke(stroke) {
if (!stroke.length) return ''
const d = stroke.reduce(
(acc, [x0, y0], i, arr) => {
const [x1, y1] = arr[(i + 1) % arr.length]
acc.push(x0, y0, (x0 + x1) / 2, (y0 + y1) / 2)
return acc
},
['M', ...stroke[0], 'Q']
)
d.push('Z')
return d.join(' ')
}
//--------------------- NO GLOBAL STATE ABOVE THIS LINE ---------------------//
//==========//
// PAINTERS //
//==========//
const berd = makePainter({
sources: ["images/berd0.png", "images/berd1.png"],
scale: 0.5,
centerY: 0.35,
centerX: 0.55,
offsetX: -47,
offsetY: -60,
speed: 0.1,
minSpeed: 0.035,
maxSpeed: 0.2,
dr: 0.05,
speedR: 0.1,
acceleration: 0.0002,
strokeOptions: {
smoothing: 1.0,
streamline: 0.5,
thinning: 0.5,
last: true,
},
})
const tode = makePainter({
sources: ["images/tode.png"],
scale: 0.5,
centerY: 0.35,
centerX: 0.55,
offsetX: -35,
offsetY: -17.5,
speed: 0.09,
minSpeed: 0.01,
maxSpeed: 0.15,
dr: 0.05,
speedR: 0.05,
acceleration: 0.00001,
strokeOptions: berd.strokeOptions,
})
const painters = [berd, tode]
//======//
// SHOW //
//======//
const show = Show.make({ layerCount: 2 })
//==============//
// Picture Mode //
//==============//
const pictureMode = (() => {
let listeners = null;
let viewBoxX, viewBoxY, viewBoxW, viewBoxH;
const dragLayer = document.createElementNS("http://www.w3.org/2000/svg", "svg")
const dragPath = document.createElementNS("http://www.w3.org/2000/svg", "path")
dragLayer.style.cursor = 'crosshair'
dragPath.setAttribute("fill", "#00000055")
function renderToCanvas(transparentBg, { x, y, w, h }) {
const canvas = document.createElement("canvas")
canvas.width = w
canvas.height = h
const ctx = canvas.getContext("2d")
ctx.clearRect(0, 0, w, h)
const layers = show.layers
return Promise.all(
layers.map((layer, i) => {
layer = layer.cloneNode(true);
layer.setAttribute("xmlns", "http://www.w3.org/2000/svg")
if (i === 0 && transparentBg) {
layer.style['background-color'] = 'transparent'
}
const outerHTML = layer.outerHTML;
const blob = new Blob([outerHTML], {type:'image/svg+xml;charset=utf-8'});
const URL = window.URL || window.webkitURL || window;
const blobURL = URL.createObjectURL(blob);
const img = new Image();
img.width = viewBoxW;
img.height = viewBoxH;
return new Promise((resolve, reject) => {
img.src = blobURL;
img.onload = () => resolve(img)
img.onerror = reject
})
})
).then(images => {
images.forEach(img => ctx.drawImage(img, -x, -y, viewBoxW, viewBoxH))
}).then(() => canvas)
}
const pm = {
start(layers) {
if (listeners) return
Array.prototype.filter.call(layers.last.style, key => key != 'cursor').forEach(key => dragLayer.style[key] = layers.last.style[key]);
[viewBoxX, viewBoxY, viewBoxW, viewBoxH] = layers.last.getAttributeNS("http://www.w3.org/2000/svg", "viewBox").split(" ").filter(x => x != "")
dragLayer.setAttributeNS("http://www.w3.org/2000/svg", "viewBox", `${viewBoxX} ${viewBoxY} ${viewBoxW} ${viewBoxH}`)
let dragStart = null;
let isDragging = false;
let isRightClick = false;
layers.last.insertAdjacentElement("afterend", dragLayer)
listeners = [
on.mousedown((e) => {
// We need focus in order to have permission
// to modify the clipboard.
// On certain OS'es, focus is granted after
// mouseup is fired
if (dragStart || !document.hasFocus()) {
isDragging = false
dragStart = null
dragPath.remove()
return
}
isRightClick = e.button === 2
dragStart = [e.clientX, e.clientY]
isDragging = false
}),
on.mousemove((e) => {
if (dragStart && !isDragging) {
isDragging = true
dragLayer.appendChild(dragPath)
}
if (isDragging) {
const [x0, y0] = dragStart
const [x1, y1] = [e.clientX, e.clientY]
const minX = Math.min(x0, x1)
const minY = Math.min(y0, y1)
const maxX = Math.max(x0, x1)
const maxY = Math.max(y0, y1)
dragPath.setAttribute("d", `M0,0L${viewBoxW},0 ${viewBoxW},${viewBoxH} 0,${viewBoxH}M${minX},${minY}L${minX},${maxY} ${maxX},${maxY} ${maxX},${minY}Z`)
}
}),
on.mouseup((e) => {
if (!dragStart) return
const canvas = document.createElement("canvas")
canvas.width = viewBoxW
canvas.height = viewBoxH
let canvasPromise
if (isDragging) {
const from = dragStart;
const to = [e.clientX, e.clientY];
const minX = Math.min(from[0], to[0]);
const minY = Math.min(from[1], to[1]);
const maxX = Math.max(from[0], to[0]);
const maxY = Math.max(from[1], to[1]);
dragPath.remove()
canvasPromise = renderToCanvas(isRightClick, {
x: minX,
y: minY,
w: maxX - minX,
h: maxY - minY
});
} else {
canvasPromise = renderToCanvas(isRightClick, {
x: 0,
y: 0,
w: viewBoxW,
h: viewBoxH,
});
}
navigator.clipboard.write([
new ClipboardItem({
"image/png": canvasPromise.then(canvas => new Promise(resolve => canvas.toBlob(resolve))),
})
]).catch(console.error)
dragStart = null
isDragging = false
}),
]
},
resize(layers) {
Array.prototype.filter.call(layers.last.style, key => key != 'cursor').forEach(key => dragLayer.style[key] = layers.last.style[key]);
[viewBoxX, viewBoxY, viewBoxW, viewBoxH] = layers.last.getAttributeNS("http://www.w3.org/2000/svg", "viewBox").split(" ").filter(x => x != "")
dragLayer.setAttributeNS("http://www.w3.org/2000/svg", "viewBox", `${viewBoxX} ${viewBoxY} ${viewBoxW} ${viewBoxH}`)
},
stop() {
if (!listeners) return
listeners.forEach(off => off())
listeners = null
dragLayer.remove()
}
}
return pm
})()
//==============//
// GLOBAL STATE //
//==============//
const global = {
painterId: 0,
painter: painters[0],
paths: [],
colour: Colour.White,
currentFrame: null,
strokeHistoryContainer: show.layers.first.appendChild(document.createElementNS("http://www.w3.org/2000/svg", "g")),
currentStrokeContainer: show.layers.last.appendChild(document.createElementNS("http://www.w3.org/2000/svg", "g")),
painterContainer: show.layers.last.appendChild(document.createElementNS("http://www.w3.org/2000/svg", "g")),
}
window.global = global
//const BLUE_SCREEN_COLOUR = Colour.multiply(Colour.Green, {lightness: 0.5})
const BLUE_SCREEN_COLOUR = Colour.Black
show.resize = (layers) => {
layers.first.style["background-color"] = BLUE_SCREEN_COLOUR
layers.forEach(layer => layer.style["cursor"] = "none")
pictureMode.resize(layers)
}
show.tick = (layers) => {
// Suspend redraw of the SVG image until all changes are made
const suspendIds = layers.map(layer => [layer, layer.suspendRedraw(5000)])
updatePainter(layers, global.strokeHistoryContainer, global.currentStrokeContainer, global.painter, global.paths, global.colour)
drawPainter(global.painter)
// Resume redraw of the SVG image
suspendIds.map(([layer, suspendId]) => layer.unsuspendRedraw(suspendId))
}
show.pause = (paused, layers) => {
if (paused) {
pictureMode.start(layers)
} else {
pictureMode.stop()
}
}
on.load(() => trigger("resize"))
//================//
// CHANGE PAINTER //
//================//
const changePainter = (painter) => {
global.painter.images.forEach((el) => {
if (el.parentNode != null) {
global.painterContainer.removeChild(el)
}
})
global.painter = painter
global.painter.images.forEach((el) => {
el.style.visibility = "hidden"
global.painterContainer.appendChild(el)
})
global.painter.images[global.painter.frame].style.visibility = "hidden"
}
// Run it once at the start to trigger the initial painter
changePainter(painters[0])
//=======//
// EVENT //
//=======//
on.contextmenu((e) => e.preventDefault(), {passive: false})
const KEYDOWN = {}
on.keydown(e => {
const func = KEYDOWN[e.key]
if (func === undefined) return
func(e)
})
KEYDOWN["x"] = () => {
const path = global.paths.pop()
if (path) {
path.element.remove()
}
if (global.painter.isPainting) {
global.painter.isPainting = false
}
}
KEYDOWN["r"] = () => {
global.paths.forEach((path) => {
path.element.remove()
})
global.paths = []
global.painter.isPainting = false
}
KEYDOWN["c"] = KEYDOWN["r"]
KEYDOWN["1"] = () => global.colour = Colour.White
KEYDOWN["2"] = () => global.colour = Colour.Red
KEYDOWN["3"] = () => global.colour = Colour.Green
KEYDOWN["4"] = () => global.colour = Colour.Blue
KEYDOWN["5"] = () => global.colour = Colour.Yellow
KEYDOWN["6"] = () => global.colour = Colour.Orange
KEYDOWN["7"] = () => global.colour = Colour.Pink
KEYDOWN["8"] = () => global.colour = Colour.Rose
KEYDOWN["9"] = () => global.colour = Colour.Cyan
KEYDOWN["0"] = () => global.colour = Colour.Purple
KEYDOWN["Tab"] = (e) => {
global.painterId++
if (global.painterId >= painters.length) {
global.painterId = 0
}
changePainter(painters[global.painterId])
e.preventDefault()
}