Сообщение от Rise
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WebGL можно использовать и для 2d, например через Pixi.
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K сожалению, это - не совсем то. Так как служит для организации спрайтовой анимации под игры.
<html>
<head><title>Пиксель Арт</title>
<script type='text/javascript' src='https://unpkg.com/stats.js@1.0.0/src/Stats.js'></script>
<script>
CanvasRenderingContext2D.prototype.lockImageData = function() {
const imageData = this.getImageData(0, 0, this.canvas.width, this.canvas.height);
imageData.context = this;
imageData.lastX = 0;
imageData.lastY = 0;
imageData.beadStyle = "-";
imageData.lineStyle = "#987654";
imageData.bresenham = null;
return imageData;
}
// Draw ImageData-Buffer back to main Canvas-Context
ImageData.prototype.flush = function() {
this.context.putImageData(this, 0, 0);
return this;
}
//
ImageData.prototype.moveTo = function(x, y) {
this.lastX = x,
this.lastY = y;
return this;
}
//
ImageData.prototype.lineTo = function(x2, y2, z2) {
var color = parseInt(this.lineStyle.substr(1), 16) |0;
var z = (z2 ? z2 : 0) |0;
"use asm";
var r = ((color >> 16) & 255) |0;
var g = ((color >> 8) & 255) |0;
var b = (color & 255) |0;
var buffer = this.data;
var x1 = Math.floor(this.lastX || 0) |0;
var y1 = Math.floor(this.lastY || 0) |0;
var dx = (x2 - x1) |0;
var dy = (y2 - y1) |0;
var mx = ((dx < 0 ? -1 : +1) << 2) |0;
var my = ((dy < 0 ? -this.width : +this.width) << 2) |0;
var len = Math.max(Math.abs(dx), Math.abs(dy)) |0;
var delta = Math.min(Math.abs(dx), Math.abs(dy)) |0;
var err = ((len >> 1) + z) |0;
var v1 = (Math.abs(dx) < Math.abs(dy) ? my : mx) |0;
var v2 = (mx + my) |0;
var ptr = ((x1 + y1 * this.width) << 2) |0;
for(var i = 0|0; i < len; i = (i + 1)|0) {
buffer[ptr] = (buffer[ptr] ^ b) |0;
buffer[ptr + 1] = (buffer[ptr + 1] ^ g) |0;
buffer[ptr + 2] = (buffer[ptr + 2] ^ r) |0;
buffer[ptr + 3] = 255 |0;
err = (err + delta) |0;
if(err < len)
ptr = (ptr + v1) |0;
else {
ptr = (ptr + v2) |0;
err = (err - len) |0;
}
}
this.lastX = Math.floor(x2),
this.lastY = Math.floor(y2);
return this;
}
ImageData.prototype.lineToAdd = function(x2, y2, z2) {
var color = parseInt(this.lineStyle.substr(1), 16) |0;
var z = (z2 ? z2 : 0) |0;
"use asm";
var r = ((color >> 16) & 255) |0;
var g = ((color >> 8) & 255) |0;
var b = (color & 255) |0;
var buffer = this.data;
var x1 = Math.floor(this.lastX || 0) |0;
var y1 = Math.floor(this.lastY || 0) |0;
var dx = (x2 - x1) |0;
var dy = (y2 - y1) |0;
var mx = ((dx < 0 ? -1 : +1) << 2) |0;
var my = ((dy < 0 ? -this.width : +this.width) << 2) |0;
var len = Math.max(Math.abs(dx), Math.abs(dy)) |0;
var delta = Math.min(Math.abs(dx), Math.abs(dy)) |0;
var err = ((len >> 1) + z) |0;
var v1 = (Math.abs(dx) < Math.abs(dy) ? my : mx) |0;
var v2 = (mx + my) |0;
var ptr = ((x1 + y1 * this.width) << 2) |0;
for(var i = 0|0; i < len; i = (i + 1)|0) {
buffer[ptr] = (buffer[ptr] + 1) |0;
buffer[ptr + 1] = (buffer[ptr + 1] + 1) |0;
buffer[ptr + 2] = (buffer[ptr + 2] + 1) |0;
buffer[ptr + 3] = 255 |0;
err = (err + delta) |0;
if(err < len)
ptr = (ptr + v1) |0;
else {
ptr = (ptr + v2) |0;
err = (err - len) |0;
}
}
this.lastX = Math.floor(x2),
this.lastY = Math.floor(y2);
return this;
}
ImageData.prototype.lineToSub = function(x2, y2, z2) {
var color = parseInt(this.lineStyle.substr(1), 16) |0;
var z = (z2 ? z2 : 0) |0;
"use asm";
var r = ((color >> 16) & 255) |0;
var g = ((color >> 8) & 255) |0;
var b = (color & 255) |0;
var buffer = this.data;
var x1 = Math.floor(this.lastX || 0) |0;
var y1 = Math.floor(this.lastY || 0) |0;
var dx = (x2 - x1) |0;
var dy = (y2 - y1) |0;
var mx = ((dx < 0 ? -1 : +1) << 2) |0;
var my = ((dy < 0 ? -this.width : +this.width) << 2) |0;
var len = Math.max(Math.abs(dx), Math.abs(dy)) |0;
var delta = Math.min(Math.abs(dx), Math.abs(dy)) |0;
var err = ((len >> 1) + z) |0;
var v1 = (Math.abs(dx) < Math.abs(dy) ? my : mx) |0;
var v2 = (mx + my) |0;
var ptr = ((x1 + y1 * this.width) << 2) |0;
for(var i = 0|0; i < len; i = (i + 1)|0) {
buffer[ptr] = (buffer[ptr] - 1) |0;
buffer[ptr + 1] = (buffer[ptr + 1] - 1) |0;
buffer[ptr + 2] = (buffer[ptr + 2] - 1) |0;
buffer[ptr + 3] = 255 |0;
err = (err + delta) |0;
if(err < len)
ptr = (ptr + v1) |0;
else {
ptr = (ptr + v2) |0;
err = (err - len) |0;
}
}
this.lastX = Math.floor(x2),
this.lastY = Math.floor(y2);
return this;
}
// Draw Beads Line
ImageData.prototype.beadsTo = function(x2, y2) {
const beads = {
"K" :{ r:0x00, g:0x00, b:0x00, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // blacK
"N" :{ r:0x80, g:0x80, b:0x00, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // browN
"R" :{ r:0xC0, g:0x00, b:0x00, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // Red
"O" :{ r:0xC0, g:0x80, b:0x00, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // Orange
"Y" :{ r:0xC0, g:0xC0, b:0x00, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // Yellow
"G" :{ r:0x00, g:0xC0, b:0x00, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // Green
"C" :{ r:0x00, g:0xC0, b:0xC0, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // Cyan
"B" :{ r:0x00, g:0x00, b:0xC0, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // Blue
"M" :{ r:0xC0, g:0x00, b:0xC0, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // Magenta
"E" :{ r:0x40, g:0x40, b:0x40, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // grEy
"S" :{ r:0x80, g:0x80, b:0x80, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // Silver
"W" :{ r:0xC0, g:0xC0, b:0xC0, rmask:0x3F, gmask:0x3F, bmask:0x3F }, // White
};
var x = Math.floor(this.lastX || 0);
var y = Math.floor(this.lastY || 0);
var dx = Math.floor(x2 - x);
var dy = Math.floor(y2 - y);
var len = Math.max(Math.abs(dx), Math.abs(dy));
var brush, bead;
var i = 0, ptr;
dx /= len ? len : 1;
dy /= len ? len : 1;
x += 0.5, y += 0.5;
while(len -- >= 0) {
bead = this.beadStyle.charAt(i ++);
if(bead == "X") {
ptr = (Math.floor(x) + Math.floor(y) * this.width) * 4;
this.data[ptr] = ((this.data[ptr] << 2) & 0xC0) | ((this.data[ptr] >> 2) & 0x30) | (this.data[ptr] & 0x0F), ptr ++;
this.data[ptr] = ((this.data[ptr] << 2) & 0xC0) | ((this.data[ptr] >> 2) & 0x30) | (this.data[ptr] & 0x0F), ptr ++;
this.data[ptr] = ((this.data[ptr] << 2) & 0xC0) | ((this.data[ptr] >> 2) & 0x30) | (this.data[ptr] & 0x0F), ptr ++;
this.data[ptr ++] = 0xFF;
} else
if(bead = beads[bead]) {
ptr = (Math.floor(x) + Math.floor(y) * this.width) * 4;
this.data[ptr] = (this.data[ptr] & bead.bmask) | bead.b, ptr ++;
this.data[ptr] = (this.data[ptr] & bead.gmask) | bead.g, ptr ++;
this.data[ptr] = (this.data[ptr] & bead.rmask) | bead.r, ptr ++;
this.data[ptr ++] = 0xFF;
}
i %= this.beadStyle.length;
x += dx,
y += dy;
}
this.beadStyle = this.beadStyle.substr(0, i) + this.beadStyle.substr(i);
this.lastX = Math.floor(x2),
this.lastY = Math.floor(y2);
return this;
}
</script>
<style>
div#stats
{
position :fixed;
top :0%;
right :0;
}
</style>
</head>
<body>
<canvas width=800px height=600px></canvas>
<script>
const stats = new Stats();
stats.setMode(0);
// Так как для рисования всегда используется сам контекст.
// Здесь мы сразу берём контекст, чтобы не плодить сущности
const hCanvas = document.querySelector("canvas").getContext("2d");
// Но, если, в редких случаях, потребуется обратиться к самому Canvas-элементу,
// это достигается через hCanvas.canvas...
// Подготавливаем наш подконтекст
const pCanvas = hCanvas.lockImageData();
// Задаём цвета нашего "бисера"
pCanvas.beadStyle = "CMYK--CCMMMYYYYK---";
// Чертим "бисерную" линию
pCanvas
.moveTo(128, 16)
.beadsTo(192, 80)
.beadsTo(128, 192)
.beadsTo(64, 80)
.beadsTo(128, 16);
// Задаём цвета нашего "бисера"
pCanvas.beadStyle = "XXXX--XXXXXXXXXX---";
// Переносим м "бисерную" линию на "задний план"
pCanvas.moveTo(128, 16).beadsTo(192, 80).beadsTo(128, 192).beadsTo(64, 80).beadsTo(128, 16);
// Задаём цвета нашего "бисера"
pCanvas.beadStyle = "RROOYYGGCCBBMM";
// Чертим "бисерную" линию над "задним планом"
pCanvas.moveTo(128, 16).beadsTo(192, 80).beadsTo(128, 192).beadsTo(64, 80).beadsTo(128, 16);
var user_x = pCanvas.width >> 1;
var user_y = pCanvas.height >> 1;
var tonnel = false;
function Tonnel(x1, y1) {
var x, y;
var w = pCanvas.width - 1;
var h = pCanvas.height - 1;
for(x = 0; x <= w; ++ x)
pCanvas
.moveTo(x, 0)
.lineTo(x1, y1)
.lineTo(w - x, h);
for(y = 0; y <= h; ++ y)
pCanvas
.moveTo(0, y)
.lineTo(x1, y1)
.lineTo(w, h - y);
}
function TonnelAdd(x1, y1) {
var x, y;
var w = pCanvas.width - 1;
var h = pCanvas.height - 1;
for(x = 0; x <= w; ++ x)
pCanvas
.moveTo(x, 0)
.lineToAdd(x1, y1)
.lineToAdd(w - x, h);
for(y = 0; y <= h; ++ y)
pCanvas
.moveTo(0, y)
.lineToAdd(x1, y1)
.lineToAdd(w, h - y);
}
function TonnelSub(x1, y1) {
var x, y;
var w = pCanvas.width - 1;
var h = pCanvas.height - 1;
for(x = 0; x <= w; ++ x)
pCanvas
.moveTo(x, 0)
.lineToSub(x1, y1)
.lineToSub(w - x, h);
for(y = 0; y <= h; ++ y)
pCanvas
.moveTo(0, y)
.lineToSub(x1, y1)
.lineToSub(w, h - y);
}
hCanvas.canvas.addEventListener("mousemove"
,function(evt) {
evt = evt || window.event;
user_x = evt.offsetX;
user_y = evt.offsetY;
tonnel = true;
}
);
pCanvas.beadStyle = "X";
function animate() {
requestAnimationFrame(animate);
stats.begin();
if(tonnel)
TonnelSub(user_x, user_y);
// Переносим м "бисерную" линию на "задний план"
pCanvas.moveTo(128, 16)
.beadsTo(192, 80).beadsTo(128, 192).beadsTo(64, 80).beadsTo(128, 16)
.flush();
//
if(tonnel)
TonnelAdd(user_x, user_y);
stats.end();
}
document.body.appendChild(stats.domElement);
animate();
</script>
</body>