Minetest-WorldEditAdditions/.docs/img2brush/img2brush.js
Starbeamrainbowlabs cc795f0f95
Fix eslint issues
2024-10-02 01:03:09 +01:00

111 lines
3.0 KiB
JavaScript

window.addEventListener("load", () => {
const dropzone = document.querySelector("#dropzone");
dropzone.addEventListener("dragenter", handle_drag_enter);
dropzone.addEventListener("dragleave", handle_drag_leave);
dropzone.addEventListener("dragover", handle_drag_over);
dropzone.addEventListener("drop", handle_drop);
document.querySelector("#brushimg-tsv").addEventListener("click", select_output);
const button_copy = document.querySelector("#brushimg-copy")
button_copy.addEventListener("click", () => {
select_output();
button_copy.innerHTML = document.execCommand("copy") ? "Copied!" : "Failed to copy :-(";
})
});
function get_source_channel_offset() {
const select = document.querySelector("#img2brush-channel");
console.info(`get_source_channel_offset: channel is ${select.value}`)
switch(select.value) {
case "alpha":
return 3;
case "red":
return 0;
case "green":
return 1;
case "blue":
return 2;
default:
throw new Error(`Error : Unknown channel name ${select.value}.`);
}
}
function select_output() {
const output = document.querySelector("#brushimg-tsv");
const selection = window.getSelection();
if (selection.rangeCount > 0)
selection.removeAllRanges();
const range = document.createRange();
range.selectNode(output);
selection.addRange(range);
}
function handle_drag_enter(event) {
event.target.classList.add("dropzone-active");
}
function handle_drag_leave(event) {
event.target.classList.remove("dropzone-active");
}
function handle_drag_over(event) {
event.preventDefault();
}
function handle_drop(event) {
event.stopPropagation();
event.preventDefault();
event.target.classList.remove("dropzone-active");
const image_file = event.dataTransfer.files[0];
const reader = new FileReader();
reader.addEventListener("load", function(_event) {
const image = new Image();
image.src = reader.result;
image.addEventListener("load", () => handle_new_image(image));
document.querySelector("#brushimg-preview").src = image.src;
});
reader.readAsDataURL(image_file);
return false;
}
function image2pixels(image) {
const canvas = document.createElement("canvas"),
ctx = canvas.getContext("2d");
canvas.width = image.width;
canvas.height = image.height;
ctx.drawImage(image, 0, 0);
return ctx.getImageData(0, 0, image.width, image.height);
}
function handle_new_image(image) {
const tsv = pixels2tsv(image2pixels(image));
document.querySelector("#brushimg-stats").value = `${image.width} x ${image.height} | ${image.width * image.height} pixels`;
document.querySelector("#brushimg-tsv").value = tsv;
}
function pixels2tsv(pixels) {
const offset = get_source_channel_offset();
console.info(`pixels2tsv: offset is ${offset}`);
let result = "";
for(let y = 0; y < pixels.height; y++) {
const row = [];
for(let x = 0; x < pixels.width; x++) {
// No need to rescale here - this is done automagically by WorldEditAdditions.
// r/b/g/alpha
row.push(pixels.data[((y*pixels.width + x) * 4) + offset] / 255);
}
result += row.join(`\t`) + `\n`;
}
return result;
}