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texturePaint.js
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texturePaint.js
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import * as THREE from 'three';
class TPBrush{
constructor(radius = 5, hardnress = 0.2)
{
this.r = radius;
this.s = radius * 2 - 1;
this.hard = hardnress;
this.col = new THREE.Color( 0x00f00fff );
this.alpha = 1;
this.buf = new Uint8Array(this.s*this.s).fill(192);
this.changeBrush(radius, hardnress);
}
changeColor(color = this.col){
color.isColor ? this.col = color : this.col = new THREE.Color(color);
}
changeOpacity(opacity = 1){
(opacity > 1 || opacity < 0) ? this.alpha = 1 : this.alpha = opacity;
}
#setPixel(d, r, hard){
if (d > r)
return 0;
else {
//let out = ((r - d) / (d - d / hard)) * 255;
let out = (( r - d ) / r) * 255 * hard;
(out > 255) ? out = 255 : out = Math.floor(out);
return out;
}
}
changeBrush(radius = this.r, hardnress = this.hard)
{
(radius > 0 && radius < 128) ? this.r = radius : this.r = 3;
(hardnress > 0 && hardnress < 1) ? this.hard = hardnress : this.hard = 1;
this.s = this.r * 2 - 1;
let shift, d, k;
this.buf = new Uint8Array(this.s*this.s*4).fill(255);
for (let i = 1; i < this.s + 1; i++)
for (let j = 1; j < this.s + 1; j++){
shift = i + (j - 1) * this.s - 1;
d = Math.sqrt(Math.pow((i - this.r), 2) + Math.pow((j - this.r), 2));
this.buf[shift] = this.#setPixel(d, this.r, this.hard);
}
}
}
class TPMarker{
constructor(texelSize = 1, texture){
this.mesh = new THREE.Mesh();
this.texture = new THREE.Texture();
this.texel = texelSize;
}
init(){
let texdata = new Image();
texdata.src = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAMAAACdt4HsAAAAGFBMVEX29vbIyMibm5vn5+djY2MuLi79/f0AAACXmgHHAAAB/UlEQVR42uyX25aDIAxFT276/388hItaRFvirNV5GJ6kq2xCEg4J1vEwVdZtwqxm4z9ivJpJBDsAEKEE+QhgllZjWZYjwKdCNECcAG35CVAYJwR640mWOmQHSCNA+oOg237fi9gOVtHGIL4GmJXtRTq3m7uVCkL47gia/pT9bcPQOILs1okqMg5XQQj27LiIgl4trwj7JJFuhq0PAesvAuwAMLbp5dVZKBOhWYKCdAMopfDq1HqWBdlstASWqVOotMuCasCkBRkAPzfcAJ/MubHcOjfBATJtQLXaTUAKwbQHNhPStglAAQPcC/CDO8BPEEikHDoyrPlDA4AcSUOOwfwJqhtF4S7A/AnW4jtwArjURgBJnpAASTDNYtc5j28Kyj/gDwGSPKuGMimv1IepLJxvY/AyuaJo0YMn1zkrtAQALihwRQoKQpa0tA5rUJLa24TyGZB1ae9CNgGhh8ULNrTSLPC0tbcxYkI1oAGKF2ZdmA2oFQqf6sf3BUotxlEt4tk4as0dNIkOqPpDPbAvKdLbUteeFtt81Z21joHvAUze7QwRteHo8wVnmSqIvuXR2jbJbcNhpXBZSt9zMGzvBUXtjRNb47bQ/mNrBV2/7V3j6Z1R6e/WvvEcOQejHPXWOZV+L4C0OY8SHhd5rswHAPVe/SQTX6NwmV0/AgwA4QtmFnE3MNgAAAAASUVORK5CYII="
texdata.onload = () => { this.texture.needsUpdate = true };
this.mesh = new THREE.Mesh(
new THREE.CircleGeometry(1,16),
new THREE.MeshBasicMaterial({ color: "#ffffff", transparent: true, side: THREE.DoubleSide, alphaTest: 0.5, depthTest: false })
)
this.mesh.renderOrder = 999;
this.texture.image = texdata;
this.texture.minFilter = THREE.LinearMipmapLinearFilter;
this.texture.magFilter = THREE.LinearFilter;
this.mesh.material.alphaMap = this.texture;
this.mesh.scale.set(this.texel);
return(this.mesh);
}
place(intersect){
this.mesh.lookAt(intersect.face.normal)
this.mesh.position.x = intersect.point.x;
this.mesh.position.y = intersect.point.y;
this.mesh.position.z = intersect.point.z;
}
}
export class TexurePaint{
constructor( mesh = null, raycaster = null, resolution = 128, historySize = 20 )
{
this.raycaster = raycaster;
this.intersects = null;
this.onpaint = false;
this.res = resolution;
this.brush = new TPBrush();
this.mesh = mesh;
this.marker = null;
this.buf = new Uint8Array(this.res*this.res*4).fill(255);
this.texture = new THREE.DataTexture(this.buf, this.res, this.res);
this.texture.needsUpdate = true;
this.texture.minFilter = THREE.LinearMipmapLinearFilter;
this.texture.magFilter = THREE.LinearFilter;
this.texture.format = THREE.RGBAFormat;
this.history = [];
this.historySize = historySize;
this.history.push(this.buf);
}
mouse(key = "LEFT", context = document){
if (typeof(key) != "string"){
console.warn(`Mouse key must be string - "LEFT", "RIGHT" or "MIDDLE"`);
return;
}
let keyIndex = 0;
switch(key){
case "LEFT": keyIndex = 0;
break;
case "RIGHT": keyIndex = 1;
break;
case "MIDDLE": keyIndex = 2;
break;
}
context.addEventListener("mousedown", (e) => {
if (e.button == keyIndex)
this.startPaint();
})
context.addEventListener("mouseup", (e) => {
if (e.button == keyIndex)
this.stopPaint();
})
}
startPaint(){
if (this.raycaster.intersectObject(this.mesh).length){
this.stage();
this.onpaint = true;
}
}
stopPaint(){
this.onpaint = false;
}
changeColor( color ){
this.brush.changeColor(color);
}
changeOpacity( opacity){
this.brush.changeOpacity(opacity);
}
changeBrush( radius, hardnress ) {
this.brush.changeBrush(radius, hardnress);
this.marker.mesh.scale.set((1 + radius/9), (1 + radius/9), (1 + radius/9));
}
getMarker(){
this.marker = new TPMarker();
this.marker.init();
return(this.marker.mesh);
}
getTexture(){
this.buf = new Uint8Array(this.res*this.res*4).fill(255);
this.texture = new THREE.DataTexture(this.buf, this.res, this.res);
return(this.texture);
}
undo(){
if (this.history[0])
for (let i = 0; i < this.buf.length; i++ )
this.buf[i] = this.history[this.history.length - 1][i];
this.history.pop();
this.texture.needsUpdate = true;
}
stage(){
if ( this.historySize >= this.history.length )
this.history.push(new Uint8Array( this.buf ));
else {
this.history.shift();
this.history.push(new Uint8Array( this.buf ));
}
}
#blendAlpha( a1 = 1, a2 = 1 ){
return(Math.round(a1 + a2*(255 - a1) / 255));
}
#blendColor ( c1 = 0, c2 = 0, a1 = 255, a2 = 255, a3 = 255 ){
//return Math.floor((c1 * a1 + c2 * a2 * (255 - a2) / 255)/255 ); // psychodelic
return Math.floor((c2*a2 + c1*a1*(255 - a2)/255)/a3);
}
#draw( uv ){
let ax = Math.floor(uv.x * this.res) - this.brush.r;
let ay = Math.floor(uv.y * this.res) - this.brush.r;
let backAlpha = 0;
let shift1, shift2;
for (let i = 1; i < this.brush.s + 1; i++)
for (let j = 1; j < this.brush.s + 1; j++){
shift1 = ((i + ax - 1) + (j + ay - 1) * this.res - 1) * 4;
shift2 = i - 1 + (j - 1) * this.brush.s;
backAlpha = this.#blendAlpha((this.buf[shift1 + 3]), (this.brush.buf[shift2]*this.brush.alpha));
this.buf[shift1] = this.#blendColor(this.buf[shift1], this.brush.col.r*255,
this.buf[shift1 + 3], this.brush.buf[shift2]*this.brush.alpha, backAlpha)
this.buf[shift1+1] = this.#blendColor(this.buf[shift1+1], this.brush.col.g*255,
this.buf[shift1 + 3], this.brush.buf[shift2]*this.brush.alpha, backAlpha)
this.buf[shift1+2] = this.#blendColor(this.buf[shift1+2], this.brush.col.b*255,
this.buf[shift1 + 3], this.brush.buf[shift2]*this.brush.alpha, backAlpha)
this.buf[shift1 + 3] = backAlpha;
}
this.texture.needsUpdate = true;
}
update(){
this.intersects = this.raycaster.intersectObject(this.mesh);
if (this.intersects.length){
if (this.onpaint){
this.#draw(this.intersects[0].uv);
this.texture.needsUpdate = true;
}
if (this.marker){
document.body.style.cursor = 'none'
this.marker.place(this.intersects[0]);
}
} else {
document.body.style.cursor = 'default';
}
}
}