101 lines
2.7 KiB
JavaScript
101 lines
2.7 KiB
JavaScript
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 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);
|
|
}
|
|
|