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let canvas;
let ctx;
let imports;
let settings = {
brightness: {},
saturate: {},
contrast: {},
blur: { filter: value => value * canvas.width / 100 + 'px' }
};
const img = new Image();
// wait for site to be parsed so element can be found
document.addEventListener("DOMContentLoaded", function() {
canvas = document.getElementById("myCanvas");
ctx = canvas.getContext("2d");
imports = document.getElementById("imports");
// bind listeners
document.getElementById("take-picture").addEventListener("click", take_picture);
document.getElementById("upload-image").addEventListener("change", upload_image)
document.getElementById("save").addEventListener("click", save_image)
document.getElementById("share").addEventListener("click", share_image)
window.addEventListener("resize", () => draw(true))
for (let setting in settings) {
// make an array out of an iterable
const elements = [...document.getElementsByClassName(setting)];
settings[setting].elements = elements;
// if filter is not definded, use identity function
settings[setting].filter ||= value => value;
for (let element of elements) {
element.addEventListener("input", settings_apply);
}
}
})
function take_picture() {
canvas.classList.remove("is-hidden");
imports.classList.add("is-hidden");
}
function upload_image() {
canvas.classList.remove("is-hidden");
imports.classList.add("is-hidden");
console.log(this.files[0]);
img.src = URL.createObjectURL(this.files[0]);
img.onload = () => draw(true);
}
function save_image() {
draw(false);
const dataUrl = canvas.toDataURL("image/png");
// downloading only works with links but not window.open
const link = document.createElement('a');
link.href = dataUrl;
link.download = 'imagine.png';
link.click();
}
function share_image() {
}
function settings_apply(event) {
const changed_setting = event.target.id;
const new_value = event.target.value;
// update all inputs for that setting (mobile and desktop) to the new value
for (let element of settings[changed_setting].elements) {
if (element == event.target) continue;
element.value = new_value;
}
draw(true);
}
function length(vec) {
return Math.sqrt(vec.reduce((acc, e) => acc + e * e, 0))
}
function mul(vec, scalar) {
return vec.map(e => e * scalar);
}
function add(vec_a, vec_b) {
return vec_a.map((e, i) => e + vec_b[i]);
}
function mix(vec_x, vec_y, scalar) {
return add(mul(vec_x, 1 - scalar), mul(vec_y, scalar));
}
// https://www.shadertoy.com/view/ldSXWK
function lensflare(uv, pos) {
const intensity = 1.5;
// const main = add(uv, mul(pos, -1));
const uvd = mul(uv, length(uv));
// let dist = length(main); dist = Math.pow(dist, .1);
// const f1 = max(0.01-Math.pow(length(add(uv,mul(pos,1.2))),1.9),.0)*7.0;
const f2 = Math.max(1.0 / (1.0 + 32.0 * Math.pow(length(add(uvd, mul(pos, 0.8))), 2.0)), .0) * 0.1;
const f22 = Math.max(1.0 / (1.0 + 32.0 * Math.pow(length(add(uvd, mul(pos, 0.85))), 2.0)), .0) * 0.08;
const f23 = Math.max(1.0 / (1.0 + 32.0 * Math.pow(length(add(uvd, mul(pos, 0.9))), 2.0)), .0) * 0.06;
let uvx = mix(uv, uvd, -0.5);
const f4 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.4))), 2.4), .0) * 6.0;
const f42 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.45))), 2.4), .0) * 5.0;
const f43 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.5))), 2.4), .0) * 3.0;
uvx = mix(uv, uvd, -.4);
const f5 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.2))), 5.5), .0) * 2.0;
const f52 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.4))), 5.5), .0) * 2.0;
const f53 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, 0.6))), 5.5), .0) * 2.0;
uvx = mix(uv, uvd, -0.5);
const f6 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, -0.3))), 1.6), .0) * 6.0;
const f62 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, -0.325))), 1.6), .0) * 3.0;
const f63 = Math.max(0.01 - Math.pow(length(add(uvx, mul(pos, -0.35))), 1.6), .0) * 5.0;
let c = [
f2 + f4 + f5 + f6,
f22 + f42 + f52 + f62,
f23 + f43 + f53 + f63
];
c = mul(c, 1.3).map(e => e - length(uvd) * .05);
return mul(c, intensity);
}
function draw(viewport_scale) {
const filter = Object.entries(settings)
.map(([setting, { elements, filter }]) => `${setting}(${filter(elements[0].value)})`)
.join(" ")
// set the resolution to the original and then scale down to the viewport to
// only calculate the filter on pixels the user can see.
canvas.height = img.naturalHeight;
canvas.width = img.naturalWidth;
if (viewport_scale) {
canvas.height = canvas.clientHeight;
canvas.width = canvas.clientWidth;
}
ctx.filter = filter
console.log(filter);
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
ctx.filter = '';
// for (let y = 0; y < canvas.height; y++) {
// for (let x = 0; x < canvas.width; x++) {
// let uv = [x / canvas.width, y / canvas.height];
// // uv[0] *= canvas.width / canvas.height;
// // let color = lensflare(uv, [.5,.5]);
// ctx.fillStyle = `rgb(${[...uv,0].map(e => Math.floor(e * 255)).join()})`;
// ctx.fillRect(x,y,1,1);
// }
// }
var imgdata = ctx.getImageData(0, 0, canvas.width, canvas.height);
const pixel_count = imgdata.data.length / 4;
for (let i = 0; i < pixel_count; i++) {
let x = i % canvas.width;
let y = i / canvas.width;
let u = (x / canvas.width - .5) * canvas.width / canvas.height;
let v = y / canvas.height - .5;
// imgdata.data[4*i] = u * 255;
// imgdata.data[4*i+1] = v * 255;
// imgdata.data[4*i+2] = 0
// imgdata.data[4*i+3] = 255;
let color = lensflare([u, v], [0.3, 0.3]);
imgdata.data[4 * i] = color[0] * 255;
imgdata.data[4 * i + 1] = color[1] * 255;
imgdata.data[4 * i + 2] = color[2] * 255;
imgdata.data[4 * i + 3] = 255;
}
ctx.putImageData(imgdata, 0, 0);
}
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