Calculator/block-drag-connect.html at main · TONGSUOregonState/Calculator · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>Block 2-input / 1-output 拖曳连线 Demo</title>
<style>
  body {
    margin: 0;
    background: #f3f4f6;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  }

  #svg {
    position: absolute;
    inset: 0;
    pointer-events: none;
  }

  .block {
    width: 180px;
    height: 120px;
    background: #ffffff;
    border-radius: 14px;
    position: absolute;
    box-shadow: 0 8px 20px rgba(15,23,42,0.08);
    border: 1px solid rgba(148,163,184,0.6);
    cursor: grab;
    user-select: none;
    padding: 8px 10px;
    box-sizing: border-box;
  }

  .title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
  }

  .formula {
    font-size: 11px;
    color: #6b7280;
    margin-bottom: 6px;
  }

  .io-row {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 4px;
  }

  .io-row label {
    font-size: 11px;
    color: #4b5563;
    width: 28px;
  }

  .io-row input[type="number"] {
    flex: 1;
    padding: 3px 6px;
    border-radius: 6px;
    border: 1px solid #d1d5db;
    font-size: 12px;
  }

  .io-row input[type="number"]:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 1px rgba(59,130,246,0.3);
  }

  .output-label {
    font-size: 12px;
    margin-top: 4px;
    color: #111827;
  }

  .output-value {
    font-family: "SF Mono", Menlo, Consolas, monospace;
    font-size: 12px;
    padding: 3px 6px;
    border-radius: 6px;
    background: #eef2ff;
    display: inline-block;
    margin-top: 2px;
  }

  .port {
    width: 14px;
    height: 14px;
    background: #3b82f6;
    border-radius: 50%;
    position: absolute;
    cursor: crosshair;
    box-shadow: 0 0 0 2px #e5e7eb;
  }

  .input-port {
    left: -7px;
  }

  .input-port[data-input-index="0"] {
    top: 40px;  /* 对应 in1 */
  }

  .input-port[data-input-index="1"] {
    top: 70px;  /* 对应 in2 */
  }

  .output-port {
    right: -7px;
    top: 55px;
  }
</style>
</head>
<body>

<svg id="svg" width="100%" height="100%"></svg>

<!-- Block 1 -->
<div class="block" id="block1" style="top: 80px; left: 80px;" data-block-id="block1">
  <div class="title">Block 1</div>
  <div class="formula">out = in1 + in2</div>
  <div class="io-row">
    <label>in1</label>
    <input type="number" class="num-input" data-input-index="0" value="1">
  </div>
  <div class="io-row">
    <label>in2</label>
    <input type="number" class="num-input" data-input-index="1" value="2">
  </div>
  <div class="output-label">out:</div>
  <div class="output-value" data-output>3</div>

  <!-- ports -->
  <div class="port input-port" data-port-type="input" data-input-index="0"></div>
  <div class="port input-port" data-port-type="input" data-input-index="1"></div>
  <div class="port output-port" data-port-type="output"></div>
</div>

<!-- Block 2 -->
<div class="block" id="block2" style="top: 260px; left: 360px;" data-block-id="block2">
  <div class="title">Block 2</div>
  <div class="formula">out = in1 + in2</div>
  <div class="io-row">
    <label>in1</label>
    <input type="number" class="num-input" data-input-index="0" value="0">
  </div>
  <div class="io-row">
    <label>in2</label>
    <input type="number" class="num-input" data-input-index="1" value="0">
  </div>
  <div class="output-label">out:</div>
  <div class="output-value" data-output>0</div>

  <!-- ports -->
  <div class="port input-port" data-port-type="input" data-input-index="0"></div>
  <div class="port input-port" data-port-type="input" data-input-index="1"></div>
  <div class="port output-port" data-port-type="output"></div>
</div>

<!-- Block 3（可以作为链式第三个） -->
<div class="block" id="block3" style="top: 120px; left: 560px;" data-block-id="block3">
  <div class="title">Block 3</div>
  <div class="formula">out = in1 + in2</div>
  <div class="io-row">
    <label>in1</label>
    <input type="number" class="num-input" data-input-index="0" value="5">
  </div>
  <div class="io-row">
    <label>in2</label>
    <input type="number" class="num-input" data-input-index="1" value="6">
  </div>
  <div class="output-label">out:</div>
  <div class="output-value" data-output>11</div>

  <!-- ports -->
  <div class="port input-port" data-port-type="input" data-input-index="0"></div>
  <div class="port input-port" data-port-type="input" data-input-index="1"></div>
  <div class="port output-port" data-port-type="output"></div>
</div>

<script>
const svg = document.getElementById('svg');

// ====== 状态：Block 与连接关系 ======
const blocks = {};      // blockId -> { in1, in2, out, manualIn1/2 }
const connections = []; // { fromBlockId, toBlockId, toInputIndex }

// 初始化 block 状态
document.querySelectorAll('.block').forEach(blockEl => {
  const id = blockEl.dataset.blockId;
  blocks[id] = {
    manualIn: [0, 0],
    in: [0, 0],
    out: 0,
    el: blockEl
  };
});

// 读取当前输入框，刷新计算
function recomputeAll() {
  // 1. 从 DOM 读取 manual 输入
  for (const id in blocks) {
    const blk = blocks[id];
    const inputs = blk.el.querySelectorAll('.num-input');
    inputs.forEach(inp => {
      const idx = Number(inp.dataset.inputIndex);
      const val = parseFloat(inp.value);
      blk.manualIn[idx] = isNaN(val) ? 0 : val;
      blk.in[idx] = blk.manualIn[idx]; // 初始 = manual
    });
  }

  // 2. 多次迭代，传播连接的值（避免链式时一次不够）
  for (let iter = 0; iter < 4; iter++) {
    // 2.1 用当前 in 计算 out（这里 out = in1 + in2，你之后可以换成别的公式）
    for (const id in blocks) {
      const blk = blocks[id];
      blk.out = blk.in[0] + blk.in[1];
    }

    // 2.2 用连接关系把源 out 填到目标 in 里
    connections.forEach(conn => {
      const fromBlk = blocks[conn.fromBlockId];
      const toBlk = blocks[conn.toBlockId];
      if (!fromBlk || !toBlk) return;
      const val = fromBlk.out;
      toBlk.in[conn.toInputIndex] = val;

      // 同步写回 DOM 输入框，让你看到值被"带入"
      const inputEl = toBlk.el.querySelector(
        `.num-input[data-input-index="${conn.toInputIndex}"]`
      );
      if (inputEl) {
        inputEl.value = val;
      }
    });
  }

  // 3. 将最终 out 写回 DOM
  for (const id in blocks) {
    const blk = blocks[id];
    const outEl = blk.el.querySelector('[data-output]');
    if (outEl) {
      outEl.textContent = formatNumber(blk.out);
    }
  }
}

// 数字格式化
function formatNumber(x) {
  if (Number.isNaN(x)) return 'NaN';
  if (!Number.isFinite(x)) return x > 0 ? '+∞' : '-∞';
  return Number(x).toFixed(4).replace(/0+$/,'').replace(/\.$/,'');
}

// ====== Block 拖动 ======
let draggingBlock = null;
let offsetX = 0;
let offsetY = 0;

document.querySelectorAll('.block').forEach(block => {
  block.addEventListener('mousedown', e => {
    if (e.target.classList.contains('port')) return;

    draggingBlock = block;
    offsetX = e.clientX - block.offsetLeft;
    offsetY = e.clientY - block.offsetTop;
    block.style.cursor = 'grabbing';
  });
});

document.addEventListener('mousemove', e => {
  if (draggingBlock) {
    draggingBlock.style.left = (e.clientX - offsetX) + 'px';
    draggingBlock.style.top = (e.clientY - offsetY) + 'px';
    updateAllLines();
  }

  if (draggingLine) {
    draggingLine.setAttribute('x2', e.clientX);
    draggingLine.setAttribute('y2', e.clientY);
  }
});

document.addEventListener('mouseup', () => {
  if (draggingBlock) draggingBlock.style.cursor = 'grab';
  draggingBlock = null;
});

// ====== 端口拖曳连线 ======
let draggingLine = null;
let startPort = null;

document.querySelectorAll('.port').forEach(port => {
  port.addEventListener('mousedown', e => {
    if (port.dataset.portType !== 'output') return;

    startPort = port;
    const rect = port.getBoundingClientRect();
    const x = rect.left + rect.width/2;
    const y = rect.top + rect.height/2;

    draggingLine = document.createElementNS('http://www.w3.org/2000/svg', 'line');
    draggingLine.setAttribute('x1', x);
    draggingLine.setAttribute('y1', y);
    draggingLine.setAttribute('x2', x);
    draggingLine.setAttribute('y2', y);
    draggingLine.setAttribute('stroke', '#3b82f6');
    draggingLine.setAttribute('stroke-width', '3');
    draggingLine.setAttribute('stroke-linecap', 'round');

    svg.appendChild(draggingLine);
  });
});

// 松手尝试连接
document.querySelectorAll('.port').forEach(port => {
  port.addEventListener('mouseup', e => {
    if (!draggingLine || !startPort) return;

    if (port.dataset.portType === 'input') {
      finalizeConnection(startPort, port);
    } else {
      draggingLine.remove();
    }

    draggingLine = null;
    startPort = null;
  });
});

// 创建真正的连接 + line
function finalizeConnection(outputPort, inputPort) {
  const fromBlock = outputPort.closest('.block');
  const toBlock = inputPort.closest('.block');
  if (!fromBlock || !toBlock) return;

  const fromId = fromBlock.dataset.blockId;
  const toId = toBlock.dataset.blockId;
  const inputIndex = Number(inputPort.dataset.inputIndex);

  // 同一个 input 只允许一个来源：删除旧的
  for (let i = connections.length - 1; i >= 0; i--) {
    if (connections[i].toBlockId === toId &&
        connections[i].toInputIndex === inputIndex) {
      // 删除对应的旧线
      const oldLine = svg.querySelector(
        `line[data-from="${connections[i].fromBlockId}"][data-to="${connections[i].toBlockId}"][data-input-index="${connections[i].toInputIndex}"]`
      );
      if (oldLine) oldLine.remove();
      connections.splice(i, 1);
    }
  }

  // 添加新连接
  connections.push({
    fromBlockId: fromId,
    toBlockId: toId,
    toInputIndex: inputIndex
  });

  // 这条才是"正式线"
  const line = document.createElementNS('http://www.w3.org/2000/svg', 'line');
  line.dataset.from = fromId;
  line.dataset.to = toId;
  line.dataset.inputIndex = inputIndex;
  svg.appendChild(line);

  updateLine(line, outputPort, inputPort);

  // 更新一次计算（把 out 值带到 input 里）
  recomputeAll();
}

// ====== 连线位置更新 ======
function updateAllLines() {
  svg.querySelectorAll('line[data-from]').forEach(line => {
    const fromId = line.dataset.from;
    const toId = line.dataset.to;
    const idx = Number(line.dataset.inputIndex);

    const fromBlk = document.querySelector(`.block[data-block-id="${fromId}"]`);
    const toBlk = document.querySelector(`.block[data-block-id="${toId}"]`);

    if (!fromBlk || !toBlk) return;

    const outPort = fromBlk.querySelector('.output-port');
    const inPort = toBlk.querySelector(`.input-port[data-input-index="${idx}"]`);

    if (outPort && inPort) {
      updateLine(line, outPort, inPort);
    }
  });
}

function updateLine(line, outPort, inPort) {
  const r1 = outPort.getBoundingClientRect();
  const r2 = inPort.getBoundingClientRect();

  const x1 = r1.left + r1.width/2;
  const y1 = r1.top + r1.height/2;
  const x2 = r2.left + r2.width/2;
  const y2 = r2.top + r2.height/2;

  line.setAttribute('x1', x1);
  line.setAttribute('y1', y1);
  line.setAttribute('x2', x2);
  line.setAttribute('y2', y2);
  line.setAttribute('stroke', '#2563eb');
  line.setAttribute('stroke-width', '3');
  line.setAttribute('stroke-linecap', 'round');
}

// ====== 输入框变化时，触发重新计算 ======
document.querySelectorAll('.num-input').forEach(inp => {
  inp.addEventListener('input', () => {
    recomputeAll();
  });
});

// 初始算一次
recomputeAll();
</script>

</body>
</html>