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VReason-Demo
File size: 3,805 Bytes
0d8d0b4
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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const d_connector_top = 5;
const d_connector_mask = 0;

function connect(mask, tbox, index) {
    const tbox_rect = tbox.getBoundingClientRect();
    const img = document.querySelector(".image-wrapper img");
    const img_rect = img.getBoundingClientRect();

    let coords;

    if (tbox.classList.contains("right")) {
        coords = connectToRight(mask, img_rect, tbox_rect);
    } else {
        coords = connectToLeft(mask, img_rect, tbox_rect);
    }

    // get the border color of this mask
    const maskColor = mask.dataset.color;

    // --- build a fresh SVG connector ---
    const connector = document.createElementNS("http://www.w3.org/2000/svg", "svg");
    connector.setAttribute("width", "1px");
    connector.setAttribute("height", "1px");
    connector.setAttribute("class", "connector");
    connector.setAttribute("id", `connector${index}`);
    connector.style.position = "absolute";
    connector.style.top = coords.top + "px";
    connector.style.left = coords.left + "px";

    // straight line
    const straight = document.createElementNS("http://www.w3.org/2000/svg", "line");
    straight.setAttribute("class", "straight");
    straight.setAttribute("x1", coords.x0);
    straight.setAttribute("y1", coords.y0);
    straight.setAttribute("x2", coords.x1);
    straight.setAttribute("y2", coords.y1);
    straight.setAttribute("stroke", maskColor);

    // diagonal line
    const diagonal = document.createElementNS("http://www.w3.org/2000/svg", "line");
    diagonal.setAttribute("class", "diagonal");
    diagonal.setAttribute("x1", coords.x1);
    diagonal.setAttribute("y1", coords.y1);
    diagonal.setAttribute("x2", coords.x2);
    diagonal.setAttribute("y2", coords.y2);
    diagonal.setAttribute("stroke", maskColor);

    connector.appendChild(straight);
    connector.appendChild(diagonal);

    const wrapper = document.querySelector(".image-wrapper");
    wrapper.appendChild(connector);
}

function connectToRight(mask, img_rect, tbox_rect) {
    const width = img_rect.width;
    const height = img_rect.height;

    const top  = parseFloat(mask.dataset.top) * height;
    const left = parseFloat(mask.dataset.left) * width;

    const w1 = img_rect.right - (img_rect.left + left) + 15;
    const w2 = tbox_rect.left - (img_rect.left + left) - w1 - d_connector_mask;
    const h2 = (tbox_rect.top + tbox_rect.bottom) / 2 - (img_rect.top + top) - d_connector_top;

    const [x0, y0] = [0, 0];
    const [x1, y1] = [x0 + w1, 0];
    const [x2, y2] = [x0 + w1 + w2, h2];

    return { top, left, x0, y0, x1, y1, x2, y2 };
}

function connectToLeft(mask, img_rect, tbox_rect) {
    const width = img_rect.width;
    const height = img_rect.height;

    const top  = parseFloat(mask.dataset.top) * height;
    const left = parseFloat(mask.dataset.left) * width;

    const w1 = left + 15;
    const w2 = (img_rect.left + left) - tbox_rect.right - w1 - d_connector_mask;
    const h2 = (tbox_rect.top + tbox_rect.bottom) / 2 - (img_rect.top + top) - d_connector_top;

    const [x0, y0] = [0, 0];
    const [x1, y1] = [x0 - w1, 0];
    const [x2, y2] = [x0 - w1 - w2, h2];

    return { top, left, x0, y0, x1, y1, x2, y2 };
}

function redrawAll() {
    const wrapper = document.querySelector(".image-wrapper");
    // clear old connectors first
    wrapper.querySelectorAll("svg.connector").forEach(el => el.remove());

    const masks = document.querySelectorAll(".svg");
    masks.forEach((mask, index) => {
        const tbox = document.querySelector(`#tbox${index}`);
        if (tbox) {
            connect(mask, tbox, index);
        }
    });
}

redrawAll();
window.addEventListener("resize", redrawAll);
window.addEventListener("scroll", redrawAll);