Minetest-WorldEditAdditions/.docs/img2brush/img2brush.js
2021-12-28 22:18:40 +00:00

93 lines
2.5 KiB
JavaScript

window.addEventListener("load", () => {
let 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);
let button_copy = document.querySelector("#brushimg-copy")
button_copy.addEventListener("click", () => {
select_output();
button_copy.innerHTML = document.execCommand("copy") ? "Copied!" : "Failed to copy :-(";
})
});
function select_output() {
let output = document.querySelector("#brushimg-tsv");
let selection = window.getSelection();
if (selection.rangeCount > 0)
selection.removeAllRanges();
let 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");
let image_file = null;
image_file = event.dataTransfer.files[0];
let reader = new FileReader();
reader.addEventListener("load", function(_event) {
let 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) {
let 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) {
let 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) {
let result = "";
for(let y = 0; y < pixels.height; y++) {
let row = [];
for(let x = 0; x < pixels.width; x++) {
// No need to rescale here - this is done automagically by WorldEditAdditions.
row.push(pixels.data[((y*pixels.width + x) * 4) + 3] / 255);
}
result += row.join(`\t`) + `\n`;
}
return result;
}