mms0316.github.io/previewmap.html at master · mms0316/mms0316.github.io · GitHub

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<!--
This webpage uses Prismarine NBT (https://github.com/PrismarineJS/prismarine-nbt)
code adapted from litemapy (https://github.com/SmylerMC/litemapy/)
and Three.js (https://threejs.org/)

Since Litematica and litemapy are GPLv3.0, here it is:

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
-->
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Schematic Previewer</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.1/css/all.min.css" integrity="sha512-KfkfwYDsLkIlwQp6LFnl8zNdLGxu9YAA1QvwINks4PhcElQSvqcyVLLD9aMhXd13uQjoXtEKNosOWaZqXgel0g==" crossorigin="anonymous" referrerpolicy="no-referrer" />
    <script src="./pnbt.js"></script>
    <script>
        const nbt = require('prismarine-nbt');
    </script>
    <script src="https://unpkg.com/[email protected]/dist/pako.min.js"></script>
    <style>
        .hidden {
            display: none;
        }

        .no-visibility {
            visibility: hidden;
            opacity: 0;
        }

        #dropzone {
            position: fixed;
            top: 0;
            left: 0;
            z-index: 999;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            transition: visibility 175ms, opacity 175ms;
        }

        #text-repr {
            position: fixed;
            top: 0;
            bottom: 0;
            right: 0;
            width: 33%;
            background: #333;
        }

        #text-repr textarea {
            position: relative;
            background: #333;
            color: #eee;
            overflow: auto;
            padding: 1em;
            resize: none;
            width: 100%;
            height: 100%;
            border: none;
        }
    </style>
</head>

<body>

    <div id="dropzone" class="no-visibility"></div>

    <div id="main">
        <header class="w3-container w3-dark-grey">
            <h2>Minimap previewer (.nbt, .litematic, .schem, .txt)</h2>
        </header>

        <form class="w3-container">
            <div class="w3-input">
                <input type="checkbox" id="noobline">
                <label for="noobline">Show/hide noobline (topmost extra row)</label>
                <br>
                <input type="checkbox" id="text">
                <label for="text">Show/hide textual representation</label>
            </div>

            <input type="file" id="schem" class="w3-input" multiple="multiple">
            <div id="schem_error" class="w3-border-red w3-pale-red hidden"></div>
        </form>

        <div id="results" class="w3-container"></div>

        <div id="text-repr" class="no-visibility">
            <canvas id="text-canvas"></canvas>
            <br>
            <button id="text-download" disabled="disabled">
                <i class="fa fa-download" style="padding-right: 9px;"></i><span>Download as .schem</span>
            </button>
            <textarea id="text-contents" placeholder="X Y Z minecraft:material[prop1=val1,prop2=val2]"></textarea>
        </div>
    </div>

    <script type="module">
        import { convertToSchem, parseTxt } from './js/schematics.js';

        const workerTxtOrNbt = new Worker('./jsworker/txtornbtworker.js');
        const workerTxtParser = new Worker('./jsworker/txtparserworker.js', {type: 'module'});
        const workerSchemParser = new Worker('./jsworker/schemparserworker.js', {type: 'module'});
        const workerPreviewMap = new Worker('./jsworker/previewmap.js', {type: 'module'});

        const noobline = document.getElementById('noobline');
        const results = document.getElementById('results');

        const dropzone = document.getElementById("dropzone");

        const schem = document.getElementById("schem");
        const schem_error = document.getElementById("schem_error");

        function showSchematicError(errorHTML, order) {
            schem_error.classList.remove("hidden");
            schem_error.innerHTML = errorHTML;

            if (order) {
                const progress = document.getElementById('progress_' + order);
                progress.classList.add('hidden');

                setProgressText('', order);
            }
        }

        let lastTarget;

        document.addEventListener("dragover", event => {
            event.preventDefault(); // prevent default to allow drop
        });

        document.addEventListener("dragenter", function (e) {
            lastTarget = e.target; // cache the last target here
            // unhide our dropzone overlay
            dropzone.style.visibility = "";
            dropzone.style.opacity = 1;
        });

        document.addEventListener("dragleave", function (e) {
            // this is the magic part. when leaving the window,
            // e.target happens to be exactly what we want: what we cached
            // at the start, the dropzone we dragged into.
            // so..if dragleave target matches our cache, we hide the dropzone.
            // `e.target === document` is a workaround for Firefox 57
            if (e.target === lastTarget || e.target === document) {
                dropzone.style.visibility = "hidden";
                dropzone.style.opacity = 0;
            }
        });

        document.addEventListener("drop", function (e) {
            e.preventDefault(); // prevent dragged file from being opened

            dropzone.style.visibility = "hidden";
            dropzone.style.opacity = 0;

            schem.value = "";

            if (e.dataTransfer.items) {
                // Use DataTransferItemList interface to access the file(s)
                const files = [];
                for (let i = 0; i < e.dataTransfer.items.length; i++) {
                    // If dropped items aren't files, reject them
                    if (e.dataTransfer.items[i].kind === 'file') {
                        const file = e.dataTransfer.items[i].getAsFile();

                        files.push(file);
                    }
                }

                if (files.length > 0) {
                    handleSchematic(files);
                }
            }
            else {
                // Use DataTransfer interface to access the file(s)
                if (e.dataTransfer.files.length > 0) {
                    handleSchematicFile(e.dataTransfer.files);
                }
            }
        });

        schem.addEventListener("change", function (event) {
            const fileList = this.files;

            if (fileList.length > 0) {
                handleSchematicFile(fileList);
            }
        }, false);

        function handleSchematicFile(files) {
            for (const file of files) {
                const i = file.name + Date.now();

                //prepare result area
                const section = document.createElement('section');
                section.id = 'result_' + i;
                section.classList.add('w3-cell', 'w3-border-left', 'w3-border-right', 'w3-border-bottom');
                results.appendChild(section);

                const span = document.createElement('span');
                span.innerText = file.name;
                section.appendChild(span);

                const div = document.createElement('div');
                div.classList.add('w3-container');
                section.appendChild(div);

                const progress = document.createElement('i');
                progress.id = 'progress_' + i;
                progress.classList.add('fa', 'fa-spinner', 'w3-spin');
                progress.style.fontSize = '48px';
                div.appendChild(progress);

                const progress_text = document.createElement('span');
                progress_text.id = 'progress_text_' + i;
                progress_text.innerText = 'Parsing file...';
                progress_text.style.display = 'block';
                div.appendChild(progress_text);

                //offload to worker
                const reader = new FileReader();
                reader.readAsArrayBuffer(file);
                reader.onload = function (evt) {
                    workerTxtOrNbt.postMessage({
                        name: file.name,
                        contents: evt.target.result,
                        echo: i
                    });
                };
            }
        }

        workerTxtOrNbt.onmessage = (e) => {
            const name = e.data.name;
            const nbt = e.data.nbt;
            const txt = e.data.txt;
            const echo = e.data.echo;
            const order = echo.order;
            if (txt) {
                setProgressText('Parsing text file...', order);

                workerTxtParser.postMessage({
                    name: name,
                    txt: txt,
                    echo: echo
                });
            }
            else if (nbt) {
                setProgressText('Parsing schematic...', order);

                workerSchemParser.postMessage({
                    name: name,
                    nbt: nbt,
                    echo: echo
                });
            }
            else {
                showSchematicError("Unable to load file", order);
            }
        };

        workerTxtParser.onmessage = onSchematic;
        workerSchemParser.onmessage = onSchematic;

        function onSchematic(e) {
            const name = e.data.name;
            const schematic = e.data.schematic;
            const order = e.data.echo;
            if (name && schematic && order) {
                const section = document.getElementById('result_' + order);

                const dimensions = document.createElement('div');
                dimensions.classList.add('w3-container');
                dimensions.innerText = `Dimensions: ${schematic.xsize} x ${schematic.ysize} x ${schematic.zsize}`;
                section.appendChild(dimensions);

                const divButton = document.createElement('div');
                divButton.classList.add('w3-container');
                section.appendChild(divButton);

                const button = document.createElement("button");
                button.setAttribute('data-filename', name);
                button.id = 'download_' + order;
                divButton.appendChild(button);

                const icon = document.createElement("i");
                icon.classList.add("fa", "fa-download");
                icon.style.paddingRight = '8px';
                button.appendChild(icon);

                const text = document.createElement("span");
                text.innerText = 'Download as .schem';
                button.appendChild(text);

                //TODO: offload convertToSchem to a Worker. Complicated because the function needs both require() and import().
                const buffer = convertToSchem(schematic);
                button.addEventListener("click", function(event) {
                    let filename = name;

                    for (const ext of ['.schem', '.nbt', '.litematic', '.txt']) {
                        if (filename.endsWith(ext)) {
                            filename = filename.slice(0, -ext.length);
                        }
                    }

                    filename += '.preview.schem';

                    download(filename, buffer);
                });

                setProgressText('Parsing map art...', order);

                workerPreviewMap.postMessage({
                    name: name,
                    schematic: schematic,
                    order: order,
                });
            }
            else if (schematic) {
                //Text editor
                workerPreviewMap.postMessage({
                    schematic: schematic,
                });

                const buffer = convertToSchem(schematic);
                const domTextDownload = document.getElementById('text-download');
                domTextDownload.removeAttribute("disabled");
                domTextDownload.onclick = function(event) {
                    download('txtedited.schem', buffer);
                };
            }
            else {
                showSchematicError("Unable to parse schematic", order);
            }
        };

        workerPreviewMap.onmessage = (e) => {
            const name = e.data.name;
            const imageData = e.data.imageData;
            const materialList = e.data.materialList;
            const textData = e.data.textData;
            const order = e.data.order;
            if (name && imageData && order) {
                const section = document.getElementById('result_' + order);

                section.appendChild(document.createElement('br'));

                //recreate canvas as it's lost between js workers
                const offscreenCanvas = new OffscreenCanvas(imageData.width, imageData.height);
                const offscreenCtx = offscreenCanvas.getContext('2d');
                offscreenCtx.putImageData(imageData, 0, 0);

                const canvas = document.createElement('canvas');
                canvas.width = imageData.width;
                canvas.height = imageData.height;
                const canvasCtx = canvas.getContext("2d");
                canvasCtx.drawImage(offscreenCanvas, 0, 0);
                canvas.classList.add('noobline-yes');
                if (!noobline.checked) {
                    canvas.classList.add('hidden');
                }
                section.appendChild(canvas);

                const canvasSkip1 = document.createElement('canvas');
                canvasSkip1.width = imageData.width;
                canvasSkip1.height = imageData.height - 1;
                const canvasCtxSkip1 = canvasSkip1.getContext("2d");
                canvasCtxSkip1.drawImage(offscreenCanvas, 0, 1, canvasSkip1.width, canvasSkip1.height, 0, 0, canvasSkip1.width, canvasSkip1.height);
                canvasSkip1.classList.add('noobline-no');
                if (noobline.checked) {
                    canvasSkip1.classList.add('hidden');
                }
                section.appendChild(canvasSkip1);

                section.appendChild(document.createElement('br'));

                const domMaterialList = document.createElement('div');
                domMaterialList.innerHTML = materialList;
                section.appendChild(domMaterialList);

                const domToTxtButton = document.createElement('button');
                domToTxtButton.innerText = 'Load to txt editor';
                section.appendChild(domToTxtButton);
                domToTxtButton.addEventListener('click', function() {
                    domTextContents.value = textData;
                    document.getElementById("text").checked = true;
                    document.getElementById("text-repr").classList.remove("no-visibility");

                    loadTextEditorCanvas();
                });

                const progress = document.getElementById('progress_' + order);
                progress.classList.add('hidden');

                setProgressText('', order);
            }
            else if (imageData) {
                //For text editor
                const domTextCanvas = document.getElementById('text-canvas');
                domTextCanvas.width = imageData.width;
                domTextCanvas.height = imageData.height;
                const canvasCtx = domTextCanvas.getContext("2d");
                canvasCtx.putImageData(imageData, 0, 0);
            }
            else {
                showSchematicError("Unable to parse schematic", order);
            }
        };

        noobline.addEventListener('click', function() {
            let elements = document.getElementsByClassName('noobline-yes');
            for (const el of elements) {
                if (this.checked) {
                    el.classList.remove('hidden');
                }
                else {
                    el.classList.add('hidden');
                }
            }
            elements = document.getElementsByClassName('noobline-no');
            for (const el of elements) {
                if (this.checked) {
                    el.classList.add('hidden');
                }
                else {
                    el.classList.remove('hidden');
                }
            }
        });

        document.getElementById("text").addEventListener("click", function() {
            document.getElementById("text-repr").classList.toggle("no-visibility");
        });

        const domTextContents = document.getElementById("text-contents");
        domTextContents.addEventListener('change', loadTextEditorCanvas);

        function loadTextEditorCanvas() {
            workerTxtParser.postMessage({
                txt: domTextContents.value,
            });
        }

        function setProgressText(text, order) {
            const progress_text = document.getElementById('progress_text_' + order);
            if (progress_text)
                progress_text.innerText = text;
        }

        function download(filename, uint8array) {
            const element = document.createElement("a");
            const blob = new Blob([uint8array], {type: "application/octet-stream"});

            element.setAttribute('href', window.URL.createObjectURL(blob));
            element.setAttribute('download', filename);

            element.style.display = 'none';
            document.body.appendChild(element);

            element.click();

            document.body.removeChild(element);
        }
    </script>
</body>

</html>