[Tixtels] Paste tool

const Tools = require("tools");
const Data = require("data");
const Chunks = require("chunks");
const Windows = require("windows");
const Camera = require("camera");
const Net = require("net");
const Utils = require("utils");

Tools.add(class extends Tools.tool {
    constructor() {
        super("Paste", {
            icon: "https://cdn3.iconfinder.com/data/icons/tango-icon-library/48/edit-paste-32.png"
        });

        Data.ctx.imageSmoothingEnabled = false;

        let temp = window.requestAnimationFrame;
        window.requestAnimationFrame = (callback) => {
            temp(() => {
                if (!Camera.changed && Tools.current == this) {
                    Chunks.rerender();
                }
                callback();
                this.renderFx();
            });
        };
    }

    renderFx() {
        if (Tools.current != this) return;

        if (!this.canvas) return;

        // Great mouse API, 10/10
        let pos = Windows.all[3].title.split(", ").map(a => parseInt(a.slice(3)));

        Data.ctx.drawImage(
            this.canvas,
            pos[0] * Camera.zoom + Data.offsets.x,
            pos[1] * Camera.zoom + Data.offsets.y,
            this.canvas.width * Camera.zoom,
            this.canvas.height * Camera.zoom
        );
    }

    selected() {
        // Upload image
        let input = document.createElement("input");
        input.type = "file";
        input.accept = "image/*";
        input.addEventListener("change", e => {
            let reader = new FileReader();
            reader.addEventListener("load", e => {
                let image = new Image();
                image.addEventListener("load", e => {
                    this.canvas = document.createElement("canvas");
                    this.canvas.width = image.width;
                    this.canvas.height = image.height;

                    let ctx = this.canvas.getContext("2d");
                    ctx.drawImage(image, 0, 0);

                    this.data = ctx.getImageData(0, 0, this.canvas.width, this.canvas.height).data;
                });
                image.src = reader.result;
            });
            reader.readAsDataURL(input.files[0]);
        });
        input.click();
    }

    down(startX, startY) {
        if (!this.data) return;

        let i = 0;

        for (let y=startY; y<startY + this.canvas.height; y++) {
            for (let x=startX; x<startX + this.canvas.width; x++, i+=4) {
                let color = [
                    this.data[i + 0],
                    this.data[i + 1],
                    this.data[i + 2]
                ];
                let alpha = this.data[i + 3];

                if (alpha == 0) continue;

                Utils.setColor(x, y, color);
            }
        }
    }
});