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iink SDK Web

Problem on Drawing after adding zoom.

I tried to add zoom-in and zoom-out on websocket_math_iink demo.

image



But after increasing the height and width (zooming), the drawing strokes not correctly positioning.

 

You can find the problem try zooming and drawing something.


Here is my code.  

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"
    />
    <meta name="apple-mobile-web-app-capable" content="yes" />
    <meta name="mobile-web-app-capable" content="yes" />
    <meta name="HandheldFriendly" content="true" />

    <title>WEBSOCKET Math iink Zoom Problem</title>
    <link rel="stylesheet" href="./style.css" />
    <link
      rel="stylesheet"
      href="https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/katex.min.css"
      integrity="sha384-AfEj0r4/OFrOo5t7NnNe46zW/tFgW6x/bCJG8FqQCEo3+Aro6EYUG4+cU+KJWu/X"
      crossorigin="anonymous"
    />

    <script
      defer
      src="https://cdn.jsdelivr.net/npm/katex@0.12.0/dist/katex.min.js"
      integrity="sha384-g7c+Jr9ZivxKLnZTDUhnkOnsh30B4H0rpLUpJ4jAIKs4fnJI+sEnkvrMWph2EDg4"
      crossorigin="anonymous"
    ></script>
    <script src="https://code.jquery.com/pep/0.4.3/pep.js"></script>
    <script src="https://myscript.github.io/iinkJS/dist/iink.min.js"></script>

    <style>
      #editor-area {
        display: flex;
        justify-content: center;
      }

      .ms-editor {
        width: 720px;
        /* height: calc(100vh - 152px); */
        height: 480px;
        touch-action: none;
        background-color: #cd1e3c;
      }
    </style>
  </head>

  <body>
    <div id="result"></div>
    <div>
      <nav>
        <div class="button-div">
          <button
            id="clear"
            class="nav-btn btn-fab-mini btn-lightBlue"
            disabled
          >
            <img src="./assets/img/clear.svg" />
          </button>
          <button id="undo" class="nav-btn btn-fab-mini btn-lightBlue" disabled>
            <img src="./assets/img/undo.svg" />
          </button>
          <button id="redo" class="nav-btn btn-fab-mini btn-lightBlue" disabled>
            <img src="./assets/img/redo.svg" />
          </button>
          <button id="zoom-in" class="nav-btn btn-fab-mini btn-lightBlue">
            +
          </button>
          <button id="zoom-out" class="nav-btn btn-fab-mini btn-lightBlue">
            -
          </button>
        </div>
        <div class="spacer"></div>
        <button class="classic-btn" id="convert" disabled>Convert</button>
      </nav>
      <div id="editor-area">
        <div id="editor" touch-action="none"></div>
      </div>
      <div style="height: 200px"></div>
    </div>
    <script>
      const editorElement = document.getElementById("editor");
      const resultElement = document.getElementById("result");
      const undoElement = document.getElementById("undo");
      const redoElement = document.getElementById("redo");
      const clearElement = document.getElementById("clear");
      const convertElement = document.getElementById("convert");
      const zoomInElement = document.getElementById("zoom-in");
      const zoomOutElement = document.getElementById("zoom-out");
     
      editorElement.addEventListener("changed", (event) => {
        undoElement.disabled = !event.detail.canUndo;
        redoElement.disabled = !event.detail.canRedo;
        clearElement.disabled = event.detail.isEmpty;
      });

      function cleanLatex(latexExport) {
        if (latexExport.includes("\\\\")) {
          const steps = "\\begin{align*}" + latexExport + "\\end{align*}";
          return steps
            .replace("\\begin{aligned}", "")
            .replace("\\end{aligned}", "")
            .replace(new RegExp("(align.{1})", "g"), "aligned");
        }
        return latexExport.replace(new RegExp("(align.{1})", "g"), "aligned");
      }

      editorElement.addEventListener("exported", (evt) => {
        const exports = evt.detail.exports;
        if (exports && exports["application/x-latex"]) {
          katex.render(
            cleanLatex(exports["application/x-latex"]),
            resultElement
          );
          convertElement.disabled = false;
        } else {
          convertElement.disabled = true;
          resultElement.innerHTML = "";
        }
      });
      undoElement.addEventListener("click", () => {
        editorElement.editor.undo();
      });
      redoElement.addEventListener("click", () => {
        editorElement.editor.redo();
      });
      clearElement.addEventListener("click", () => {
        editorElement.editor.clear();
      });
      convertElement.addEventListener("click", () => {
        editorElement.editor.convert();
      });

      // zoom related work

      let zoomScale = 1.0;
      let width = 720;
      let height = 480;

      zoomInElement.addEventListener("click", () => {
        if (zoomScale < 2.0) {
          zoomScale += 0.1;
        }
        const editorDiv = editorElement.editor.domElement;
      

        editorDiv.style.width = width * zoomScale + "px";
        editorDiv.style.height = height * zoomScale + "px";
        // editorElement.editor.zoomIn();
        console.log("zoom in");
      });

      zoomOutElement.addEventListener("click", () => {
        console.log({ zoomScale });
        if (zoomScale > 1.0) {
          zoomScale -= 0.1;
        }
        console.log({ zoomScale });
        const editorDiv = editorElement.editor.domElement;

        editorDiv.style.width = width * zoomScale + "px";
        editorDiv.style.height = height * zoomScale + "px";
        console.log("zoom out");
      });

      /**
       * Attach an editor to the document
       * @param {Element} The DOM element to attach the ink paper
       * @param {Object} The recognition parameters
       */
      iink.register(editorElement, {
        recognitionParams: {
          type: "MATH",
          protocol: "WEBSOCKET",
          server: {
            scheme: "https",
            host: "webdemoapi.myscript.com",
            applicationKey: "4c221e0f-9fc8-4db5-95cc-84089ca3e86b",
            hmacKey: "0bf27f75-db9e-489c-ad26-0b46d87aba2a",
          },
          iink: {
            math: {
              mimeTypes: [
                "application/x-latex",
                "application/vnd.myscript.jiix",
                "application/mathml+xml",
              ],
            },
            export: {
              jiix: {
                strokes: true,
              },
            },
          },
        },
      });

      window.addEventListener("resize", () => {
        editorElement.editor.resize();
      });
    </script>
  </body>
</html>

 

video of the problem: https://clipchamp.com/watch/NhmjqMOKYWA

Live: https://bhnibir.github.io/IinkJs-zoom-problem/ 

Github: https://github.com/bhNibir/IinkJs-zoom-problem

How to solve this problem?




5 CommentsSorted by Oldest First

Everything is absolutely fine. The draw stroke and mouse cursor pointer position do not match when trying to draw something after zooming.

Dear Biplob,


Thank you for contacting us and your project.


I was indeed able to reproduce without any difficulty.


I keep you updated.


Best regards,


Olivier

image

Live: https://bhnibir.github.io/IinkJs-zoom-problem/ 
Github: https://github.com/bhNibir/IinkJs-zoom-problem

Thank you for your reply.

when I am zooming, the mouse cursor pointer and the stroke drawing not matching.
You will see the problem in the attached picture.

I don't get any solution still. Can you please give me an example code of the solution please?

Hey Team,

Can you let us know the resolution for this? We are awaiting response as this is a crucial piece of our development.

Regards,

Shariq A

Dear Sansar,


the issue is tracked internally, but we cannot commit when it will be solved.


Meanwhile, as the source code of the iinkJS is provided, you can have a look and update it according to your needs: https://github.com/MyScript/iinkJS


Best regards,


Olivier

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