通过对话，deepseek能辅助完成一个绘图H5页面。如下：

完成之后的效果如下：

咨询步骤

1. 给选中的图形加轮廓线

2. 要求轮廓然随拖动移动

3. 增加右键菜单，用来删除选中对象

完整代码

  
  
  
  


  
SVG Drawing Toolbox
  

    Select
    Rectangle
    Circle
    Line
    Text
    Undo
    Redo
    
    
    
  
  
  

  
  

    结束线段（双击）
    闭环线段（右键）
    选中拖动
    删除
  

  <script>
    const svgContainer = document.getElementById("svg-container");
    const codeViewer = document.getElementById("code-viewer");
    const contextMenu = document.getElementById("context-menu");
    
    let currentTool = null;
    let startX, startY;
    let currentElement = null; // 当前正在绘制的元素
    let selectedElements = []; // 存储选中的图形
    let isDragging = false;
    let dragStartX, dragStartY;

    // 在全局变量中添加虚线预览元素
  let previewLine = null;

    // 线段绘制相关状态
    let isDrawingLine = false; // 是否正在绘制线段
    let initialPoint = null; // 初始点
    let lastPoint = null; // 上一个起始点
    let currentLineGroup = null; // 当前线段的组

    // Undo/Redo 相关状态
    let historyStack = []; // 操作历史栈
    let redoStack = []; // 重做栈

    // 工具箱事件监听
    document.getElementById("select-btn").addEventListener("click", () => {
      currentTool = "select";
      resetLineDrawing();
    });
    document.getElementById("rect-btn").addEventListener("click", () => {
      currentTool = "rect";
      resetLineDrawing();
    });
    document.getElementById("circle-btn").addEventListener("click", () => {
      currentTool = "circle";
      resetLineDrawing();
    });
    document.getElementById("line-btn").addEventListener("click", () => {
      currentTool = "line";
      resetLineDrawing();
    });
    document.getElementById("text-btn").addEventListener("click", () => {
      currentTool = "text";
      resetLineDrawing();
    });
    document.getElementById("undo-btn").addEventListener("click", () => {
      undo();
    });
    document.getElementById("redo-btn").addEventListener("click", () => {
      redo();
    });

    // 自定义上下文菜单事件监听
    document.getElementById("end-line").addEventListener("click", () => {
      resetLineDrawing();
      hideContextMenu();
    });
    document.getElementById("close-loop").addEventListener("click", () => {
      if (isDrawingLine && initialPoint && lastPoint) {
        drawLineSegment(lastPoint.x, lastPoint.y, initialPoint.x, initialPoint.y);
        resetLineDrawing();
      }
      hideContextMenu();
    });
    document.getElementById("select-drag").addEventListener("click", () => {
      currentTool = "select";
      hideContextMenu();
    });
    document.getElementById("delete-element").addEventListener("click", () => {
      // 删除选中的元素
      selectedElements.forEach(element => {
        element.remove();
        removeSelectionBorder(element);
      });
      selectedElements = [];
      saveState(); // 保存状态
      updateCodeViewer();
      hideContextMenu();
    });

    function releasePreview(){
      if(previewLine){
        previewLine.remove();
        previewLine = null;
      }
    }

    // 显示自定义上下文菜单
    function showContextMenu(x, y) {
      contextMenu.style.display = "block";
      contextMenu.style.left = `${x}px`;
      contextMenu.style.top = `${y}px`;

      // 显示或隐藏删除按钮
      const deleteButton = document.getElementById("delete-element");
      if (selectedElements.length > 0) {
        deleteButton.style.display = "block";
      } else {
        deleteButton.style.display = "none";
      }
    }

    // 隐藏自定义上下文菜单
    function hideContextMenu() {
      contextMenu.style.display = "none";
    }

    // 鼠标事件监听
    svgContainer.addEventListener("mousedown", (event) => {
      const x = event.offsetX;
      const y = event.offsetY;

      if (event.button === 2) {
        // 右键点击，显示自定义上下文菜单
        event.preventDefault();
        showContextMenu(event.clientX, event.clientY);
        return;
      }

      if (currentTool === "select") {
        // 选择工具：选中图形
        console.log(event.target);
        if (event.target.tagName === "rect" || event.target.tagName === "circle" || event.target.tagName === "text" || event.target.tagName === "line" || event.target.tagName === "g") {
          var element = event.target;

          if ((event.target.tagName === "line") && (event.target.parentNode && event.target.parentNode.tagName === "g")) {
            element = event.target.parentNode;
          }

          console.log(element);

          // 按住 Shift 键多选
          if (!event.shiftKey) {
            selectedElements.forEach(el => {
              el.classList.remove("selected");
              removeSelectionBorder(el); // 移除选中边框
            });
            selectedElements = [];
          }

          if (!selectedElements.includes(element)) {
            selectedElements.push(element);
            element.classList.add("selected");
            addSelectionBorder(element); // 添加选中边框
          }

          // 开始拖动
          isDragging = true;
          dragStartX = event.offsetX;
          dragStartY = event.offsetY;
        } else {
          // 点击空白区域取消选中
          selectedElements.forEach(el => {
            el.classList.remove("selected");
            removeSelectionBorder(el); // 移除选中边框
          });
          selectedElements = [];
        }
      } else if (currentTool === "text") {
        // 文字工具
        const text = prompt("Enter text:");
        if (text) {
          const textElement = document.createElementNS("http://www.w3.org/2000/svg", "text");
          textElement.setAttribute("x", x);
          textElement.setAttribute("y", y);
          textElement.setAttribute("fill", document.getElementById("stroke-color").value);
          textElement.setAttribute("font-size", "20");
          textElement.textContent = text;
          svgContainer.appendChild(textElement);
          saveState(); // 保存状态
          updateCodeViewer();
        }
      } else if (currentTool === "line") {
        if (event.detail === 2) {
          // 双击清空初始点
          resetLineDrawing();
        } else if (event.button === 0) {
          // 左键点击
          if (!isDrawingLine) {
            // 第一次点击，设置初始点和起始点
            initialPoint = { x, y };
            lastPoint = { x, y };
            isDrawingLine = true;

            // 创建新的线段组
            currentLineGroup = document.createElementNS("http://www.w3.org/2000/svg", "g");
            svgContainer.appendChild(currentLineGroup);
          } else {
            // 后续点击，绘制线段并更新起始点
            drawLineSegment(lastPoint.x, lastPoint.y, x, y);
            lastPoint = { x, y }; // 更新起始点
          }
        }
      } else if (currentTool === "rect" || currentTool === "circle") {
        // 矩形或圆形工具
        startX = x;
        startY = y;

        switch (currentTool) {
          case "rect":
            currentElement = document.createElementNS("http://www.w3.org/2000/svg", "rect");
            currentElement.setAttribute("x", startX);
            currentElement.setAttribute("y", startY);
            break;
          case "circle":
            currentElement = document.createElementNS("http://www.w3.org/2000/svg", "circle");
            currentElement.setAttribute("cx", startX);
            currentElement.setAttribute("cy", startY);
            break;
        }

        if (currentElement) {
          currentElement.setAttribute("stroke", document.getElementById("stroke-color").value);
          currentElement.setAttribute("stroke-width", document.getElementById("stroke-width").value);
          currentElement.setAttribute("fill", document.getElementById("fill-color").value);
          svgContainer.appendChild(currentElement);
        }
      }
    });

    svgContainer.addEventListener("mousemove", (event) => {
      if (currentTool === "select" && isDragging) {
        // 选择工具：拖动图形
        const dx = event.offsetX - dragStartX;
        const dy = event.offsetY - dragStartY;

        selectedElements.forEach(element => {
          if (element.tagName === "rect") {
            const x = parseFloat(element.getAttribute("x")) + dx;
            const y = parseFloat(element.getAttribute("y")) + dy;
            element.setAttribute("x", x);
            element.setAttribute("y", y);
          } else if (element.tagName === "circle") {
            const cx = parseFloat(element.getAttribute("cx")) + dx;
            const cy = parseFloat(element.getAttribute("cy")) + dy;
            element.setAttribute("cx", cx);
            element.setAttribute("cy", cy);
          } else if (element.tagName === "text") {
            const x = parseFloat(element.getAttribute("x")) + dx;
            const y = parseFloat(element.getAttribute("y")) + dy;
            element.setAttribute("x", x);
            element.setAttribute("y", y);
          } else if (element.tagName === "line") {
            const x1 = parseFloat(element.getAttribute("x1")) + dx;
            const y1 = parseFloat(element.getAttribute("y1")) + dy;
            const x2 = parseFloat(element.getAttribute("x2")) + dx;
            const y2 = parseFloat(element.getAttribute("y2")) + dy;
            element.setAttribute("x1", x1);
            element.setAttribute("y1", y1);
            element.setAttribute("x2", x2);
            element.setAttribute("y2", y2);
          } else if (element.tagName === "g") {
            // 移动整个线段组
            Array.from(element.children).forEach(line => {
              const x1 = parseFloat(line.getAttribute("x1")) + dx;
              const y1 = parseFloat(line.getAttribute("y1")) + dy;
              const x2 = parseFloat(line.getAttribute("x2")) + dx;
              const y2 = parseFloat(line.getAttribute("y2")) + dy;
              line.setAttribute("x1", x1);
              line.setAttribute("y1", y1);
              line.setAttribute("x2", x2);
              line.setAttribute("y2", y2);
            });
          }

          updateSelectionBorder(element); // 更新选中边框位置
        });

        dragStartX = event.offsetX;
        dragStartY = event.offsetY;
        updateCodeViewer();
      } else if ((currentTool === "rect" || currentTool === "circle") && currentElement) {
        // 矩形或圆形工具：调整图形大小
        const currentX = event.offsetX;
        const currentY = event.offsetY;

        switch (currentTool) {
          case "rect":
            currentElement.setAttribute("width", Math.abs(currentX - startX));
            currentElement.setAttribute("height", Math.abs(currentY - startY));
            break;
          case "circle":
            const radius = Math.sqrt(Math.pow(currentX - startX, 2) + Math.pow(currentY - startY, 2));
            currentElement.setAttribute("r", radius);
            break;
        }

        updateCodeViewer();
      }else if (currentTool === "line" && isDrawingLine && lastPoint) {
        // 线段工具：绘制虚线预览
        if (!previewLine) {
          previewLine = document.createElementNS("http://www.w3.org/2000/svg", "line");
          previewLine.setAttribute("stroke", "#000000"); // 虚线颜色
          previewLine.setAttribute("stroke-width", document.getElementById("stroke-width").value);
          previewLine.setAttribute("stroke-dasharray", "5,5"); // 虚线样式
          previewLine.setAttribute("fill", "none");
          svgContainer.appendChild(previewLine);
        }
        const x = event.offsetX;
        const y = event.offsetY;
        console.log(lastPoint,x,y)
        previewLine.setAttribute("x1", lastPoint.x);
        previewLine.setAttribute("y1", lastPoint.y);
        previewLine.setAttribute("x2", x);
        previewLine.setAttribute("y2", y);
      }
    });

    svgContainer.addEventListener("mouseup", () => {
      if (currentTool === "select") {
        isDragging = false;
      } else if (currentTool === "rect" || currentTool === "circle") {
        currentElement = null;
        saveState(); // 保存状态
      }else if (currentTool === "line") {
        // 移除虚线预览
        releasePreview();
      }
    });

    // 绘制线段
    function drawLineSegment(x1, y1, x2, y2) {
      if (!currentLineGroup) {
        // 如果 currentLineGroup 未初始化，则创建一个新的组
        currentLineGroup = document.createElementNS("http://www.w3.org/2000/svg", "g");
        svgContainer.appendChild(currentLineGroup);
      }

      const line = document.createElementNS("http://www.w3.org/2000/svg", "line");
      line.setAttribute("x1", x1);
      line.setAttribute("y1", y1);
      line.setAttribute("x2", x2);
      line.setAttribute("y2", y2);
      line.setAttribute("stroke", document.getElementById("stroke-color").value);
      line.setAttribute("stroke-width", document.getElementById("stroke-width").value);
      currentLineGroup.appendChild(line);
      saveState(); // 保存状态
      updateCodeViewer();
    }

    // 重置线段绘制状态
    function resetLineDrawing() {
      isDrawingLine = false;
      initialPoint = null;
      lastPoint = null;
      currentLineGroup = null;
      
        // 移除虚线预览
        releasePreview();
    }

    // 更新代码查看器
    function updateCodeViewer() {
      const serializer = new XMLSerializer();
      const svgCode = serializer.serializeToString(svgContainer);
      codeViewer.value = svgCode;
    }

    // 保存当前状态到历史栈
    function saveState() {
      const serializer = new XMLSerializer();
      const svgCode = serializer.serializeToString(svgContainer);
      historyStack.push(svgCode);
      redoStack = []; // 清空重做栈
    }

    // 撤销操作
    function undo() {
      if (historyStack.length > 1) {
        redoStack.push(historyStack.pop()); // 将当前状态移到重做栈
        const previousState = historyStack[historyStack.length - 1];
        svgContainer.innerHTML = previousState; // 恢复到上一个状态
        updateCodeViewer();
      }
    }

    // 重做操作
    function redo() {
      if (redoStack.length > 0) {
        const nextState = redoStack.pop(); // 从重做栈中取出下一个状态
        historyStack.push(nextState); // 将状态移回历史栈
        svgContainer.innerHTML = nextState; // 恢复到下一个状态
        updateCodeViewer();
      }
    }

    // 添加选中边框
    function addSelectionBorder(element) {
      const bbox = element.getBBox();
      const padding = 5; // 边框比图形大 2px
      const border = document.createElementNS("http://www.w3.org/2000/svg", "rect");
      border.setAttribute("x", bbox.x - padding);
      border.setAttribute("y", bbox.y - padding);
      border.setAttribute("width", bbox.width + 2 * padding);
      border.setAttribute("height", bbox.height + 2 * padding);
      border.setAttribute("stroke", "#FF0000"); // 红色虚线
      border.setAttribute("stroke-width", "2");
      border.setAttribute("stroke-dasharray", "5,5");
      border.setAttribute("fill", "none");
      border.classList.add("selection-border");
      svgContainer.appendChild(border);
      element.border = border; // 将边框引用存储在元素上
    }

    // 移除选中边框
    function removeSelectionBorder(element) {
      if (element && element.border) {
        element.border.remove();
        delete element.border;
      }
    }
    // 更新选中边框位置
    function updateSelectionBorder(element) {
      if (element && element.border) {
        const bbox = element.getBBox();
        const padding = 2; // 边框比图形大 2px
        element.border.setAttribute("x", bbox.x - padding);
        element.border.setAttribute("y", bbox.y - padding);
        element.border.setAttribute("width", bbox.width + 2 * padding);
        element.border.setAttribute("height", bbox.height + 2 * padding);
      }
    }
    // 点击页面其他区域隐藏上下文菜单
    document.addEventListener("click", () => {
      hideContextMenu();
    });

    // 阻止浏览器默认右键菜单
    document.addEventListener("contextmenu", (event) => {
      event.preventDefault();
    });
  </script>

参考资料

上述页面的完整代码在gitee上，路径如下：

https://gitee.com/wapuboy/learning-programming-with-gauss/blob/master/code/javascript/src/svg.html