修改

public/css/style.css

@@ -217,7 +217,7 @@ body {
 }
 
 #overlay-canvas.can-drag {
-  cursor: ns-resize;
+  cursor: move;
 }
 
 .footer {
@@ -235,23 +235,24 @@ body {
 
 .legend {
   display: inline-block;
-  width: 24px;
-  height: 3px;
+  width: 0;
+  height: 0;
   vertical-align: middle;
-  margin-left: 4px;
-  border-radius: 1px;
+  margin-left: 6px;
+  border-left: 6px solid transparent;
+  border-right: 6px solid transparent;
 }
 
 .legend.entry {
-  background: var(--entry);
+  border-bottom: 10px solid var(--entry);
 }
 
 .legend.exit {
-  background: var(--exit);
+  border-top: 10px solid var(--exit);
 }
 
 .legend.stop {
-  background: var(--stop);
+  border-top: 10px solid var(--stop);
 }
 
 .footer-note {

public/index.html

@@ -15,9 +15,9 @@
         <input type="file" id="file-input" accept="image/jpeg,image/png,.jpg,.jpeg,.png" hidden>
       </label>
       <div class="mode-group" role="group" aria-label="标注模式">
-        <button type="button" class="btn mode-btn active" data-mode="entry">入场线</button>
-        <button type="button" class="btn mode-btn" data-mode="exit">出场线</button>
-        <button type="button" class="btn mode-btn" data-mode="stop">止损线</button>
+        <button type="button" class="btn mode-btn active" data-mode="entry">入场 ↑</button>
+        <button type="button" class="btn mode-btn" data-mode="exit">出场 ↓</button>
+        <button type="button" class="btn mode-btn" data-mode="stop">止损 ↓</button>
       </div>
       <button type="button" class="btn" id="btn-undo" disabled>撤销</button>
       <button type="button" class="btn" id="btn-clear" disabled>清空全部</button>
@@ -44,7 +44,7 @@
     <span>入场 <i class="legend entry"></i></span>
     <span>出场 <i class="legend exit"></i></span>
     <span>止损 <i class="legend stop"></i></span>
-    <span class="footer-note">单击添加水平线 · 拖拽调整位置</span>
+    <span class="footer-note">单击添加箭头 · 拖拽调整位置 · 可连续标注多个点位</span>
   </footer>
 
   <script src="js/app.js"></script>

public/js/app.js

@@ -1,14 +1,17 @@
 (function () {
   "use strict";
 
-  const LINE_TYPES = {
-    entry: { label: "入场线", color: "#00ff00" },
-    exit: { label: "出场线", color: "#0099ff" },
-    stop: { label: "止损线", color: "#ff3333" },
+  const MARKER_TYPES = {
+    entry: { label: "入场", color: "#00ff00", direction: "up" },
+    exit: { label: "出场", color: "#0099ff", direction: "down" },
+    stop: { label: "止损", color: "#ff3333", direction: "down" },
   };
 
-  const LINE_WIDTH = 3;
-  const HIT_TOLERANCE = 8;
+  const ARROW_HEAD = 12;
+  const ARROW_STEM = 14;
+  const ARROW_WIDTH = 9;
+  const LINE_WIDTH = 2;
+  const HIT_RADIUS = 18;
 
   const fileInput = document.getElementById("file-input");
   const dropZone = document.getElementById("drop-zone");
@@ -24,7 +27,7 @@
   const modeButtons = document.querySelectorAll(".mode-btn");
 
   let currentMode = "entry";
-  let lines = [];
+  let markers = [];
   let displayWidth = 0;
   let displayHeight = 0;
   let imageLoaded = false;
@@ -38,9 +41,9 @@
 
   function updateButtons() {
     const hasImage = imageLoaded;
-    const hasLines = lines.length > 0;
-    btnUndo.disabled = !hasImage || !hasLines;
-    btnClear.disabled = !hasImage || !hasLines;
+    const hasMarkers = markers.length > 0;
+    btnUndo.disabled = !hasImage || !hasMarkers;
+    btnClear.disabled = !hasImage || !hasMarkers;
     btnDownload.disabled = !hasImage;
   }
 
@@ -54,25 +57,67 @@
     };
   }
 
-  function findLineAtY(y) {
-    for (let i = lines.length - 1; i >= 0; i--) {
-      if (Math.abs(lines[i].y - y) <= HIT_TOLERANCE) {
+  function getMarkerDirection(type) {
+    return MARKER_TYPES[type].direction;
+  }
+
+  function dist(x1, y1, x2, y2) {
+    const dx = x1 - x2;
+    const dy = y1 - y2;
+    return Math.sqrt(dx * dx + dy * dy);
+  }
+
+  function findMarkerAt(x, y) {
+    for (let i = markers.length - 1; i >= 0; i--) {
+      if (dist(x, y, markers[i].x, markers[i].y) <= HIT_RADIUS) {
         return i;
       }
     }
     return -1;
   }
 
+  function drawArrowMarker(targetCtx, x, y, type, color) {
+    const direction = getMarkerDirection(type);
+    const w = ARROW_WIDTH;
+    const h = ARROW_HEAD;
+    const stem = ARROW_STEM;
+
+    targetCtx.fillStyle = color;
+    targetCtx.strokeStyle = color;
+    targetCtx.lineWidth = LINE_WIDTH;
+    targetCtx.lineCap = "round";
+    targetCtx.lineJoin = "round";
+
+    if (direction === "up") {
+      targetCtx.beginPath();
+      targetCtx.moveTo(x, y);
+      targetCtx.lineTo(x - w, y + h);
+      targetCtx.lineTo(x + w, y + h);
+      targetCtx.closePath();
+      targetCtx.fill();
+      targetCtx.beginPath();
+      targetCtx.moveTo(x, y + h);
+      targetCtx.lineTo(x, y + h + stem);
+      targetCtx.stroke();
+    } else {
+      targetCtx.beginPath();
+      targetCtx.moveTo(x, y);
+      targetCtx.lineTo(x - w, y - h);
+      targetCtx.lineTo(x + w, y - h);
+      targetCtx.closePath();
+      targetCtx.fill();
+      targetCtx.beginPath();
+      targetCtx.moveTo(x, y - h);
+      targetCtx.lineTo(x, y - h - stem);
+      targetCtx.stroke();
+    }
+  }
+
   function redraw() {
     if (!imageLoaded) return;
     ctx.clearRect(0, 0, canvas.width, canvas.height);
-    for (const line of lines) {
-      ctx.beginPath();
-      ctx.strokeStyle = line.color;
-      ctx.lineWidth = LINE_WIDTH;
-      ctx.moveTo(0, line.y);
-      ctx.lineTo(canvas.width, line.y);
-      ctx.stroke();
+    for (const m of markers) {
+      drawArrowMarker(ctx, m.x, m.y, m.type, m.color);
     }
   }
 
@@ -87,9 +132,10 @@
   }
 
   function clearAnnotations() {
-    lines = [];
+    markers = [];
     dragIndex = -1;
     isDragging = false;
+    didDragMove = false;
     redraw();
     updateButtons();
   }
@@ -116,8 +162,8 @@
           syncCanvasSize();
           setHint(
             "当前模式：" +
-              LINE_TYPES[currentMode].label +
-              " — 在图上单击添加水平线，可拖拽调整"
+              MARKER_TYPES[currentMode].label +
+              " — 在图上单击添加箭头标记，可拖拽调整"
           );
           updateButtons();
         });
@@ -135,19 +181,18 @@
     reader.readAsDataURL(file);
   }
 
-  function addLine(y) {
+  function addMarker(x, y) {
     const type = currentMode;
-    const info = LINE_TYPES[type];
-    lines.push({ y: y, type: type, color: info.color });
+    const info = MARKER_TYPES[type];
+    markers.push({ x: x, y: y, type: type, color: info.color });
     redraw();
     updateButtons();
     setHint(
       "已添加 " +
         info.label +
-        "（共 " +
-        lines.length +
-        " 条）— 当前模式：" +
-        info.label
+        " 标记（共 " +
+        markers.length +
+        " 个）— 可切换模式继续标注"
     );
   }
 
@@ -156,6 +201,7 @@
 
     const natW = chartImage.naturalWidth;
     const natH = chartImage.naturalHeight;
+    const scaleX = natW / displayWidth;
     const scaleY = natH / displayHeight;
 
     const exportCanvas = document.createElement("canvas");
@@ -165,14 +211,14 @@
 
     exCtx.drawImage(chartImage, 0, 0, natW, natH);
 
-    for (const line of lines) {
-      const y = line.y * scaleY;
-      exCtx.beginPath();
-      exCtx.strokeStyle = line.color;
-      exCtx.lineWidth = LINE_WIDTH;
-      exCtx.moveTo(0, y);
-      exCtx.lineTo(natW, y);
-      exCtx.stroke();
+    for (const m of markers) {
+      drawArrowMarker(
+        exCtx,
+        m.x * scaleX,
+        m.y * scaleY,
+        m.type,
+        m.color
+      );
     }
 
     exportCanvas.toBlob(function (blob) {
@@ -204,8 +250,8 @@
     }, "image/png");
   }
 
-  function updateCursor(y) {
-    const idx = findLineAtY(y);
+  function updateCursor(x, y) {
+    const idx = findMarkerAt(x, y);
     if (idx >= 0) {
       canvas.classList.add("can-drag");
     } else {
@@ -214,14 +260,20 @@
   }
 
   modeButtons.forEach(function (btn) {
-    btn.addEventListener("click", function () {
+    btn.addEventListener("click", function (e) {
+      e.stopPropagation();
       modeButtons.forEach(function (b) {
         b.classList.remove("active");
       });
       btn.classList.add("active");
       currentMode = btn.dataset.mode;
+      didDragMove = false;
       if (imageLoaded) {
-        setHint("当前模式：" + LINE_TYPES[currentMode].label + " — 单击添加水平线");
+        setHint(
+          "当前模式：" +
+            MARKER_TYPES[currentMode].label +
+            " — 单击添加箭头，可连续标注多个点位"
+        );
       }
     });
   });
@@ -254,7 +306,7 @@
     if (!imageLoaded) return;
     e.preventDefault();
     const pt = getCanvasPoint(e);
-    const idx = findLineAtY(pt.y);
+    const idx = findMarkerAt(pt.x, pt.y);
     if (idx >= 0) {
       dragIndex = idx;
       isDragging = true;
@@ -269,12 +321,13 @@
 
     if (isDragging && dragIndex >= 0) {
       didDragMove = true;
-      lines[dragIndex].y = Math.max(0, Math.min(canvas.height, pt.y));
+      markers[dragIndex].x = Math.max(0, Math.min(canvas.width, pt.x));
+      markers[dragIndex].y = Math.max(0, Math.min(canvas.height, pt.y));
       redraw();
       return;
     }
 
-    updateCursor(pt.y);
+    updateCursor(pt.x, pt.y);
   });
 
   canvas.addEventListener("mouseup", function () {
@@ -289,27 +342,31 @@
   });
 
   canvas.addEventListener("click", function (e) {
-    if (!imageLoaded || didDragMove) return;
+    if (!imageLoaded) return;
+    if (didDragMove) {
+      didDragMove = false;
+      return;
+    }
     const pt = getCanvasPoint(e);
-    if (findLineAtY(pt.y) >= 0) return;
-    addLine(pt.y);
+    if (findMarkerAt(pt.x, pt.y) >= 0) return;
+    addMarker(pt.x, pt.y);
   });
 
   btnUndo.addEventListener("click", function () {
-    if (lines.length === 0) return;
-    lines.pop();
+    if (markers.length === 0) return;
+    markers.pop();
     redraw();
     updateButtons();
     setHint(
-      lines.length
-        ? "已撤销最后一条，剩余 " + lines.length + " 条"
-        : "已撤销全部线条"
+      markers.length
+        ? "已撤销最后一个标记，剩余 " + markers.length + " 个"
+        : "已撤销全部标记"
     );
   });
 
   btnClear.addEventListener("click", function () {
-    if (lines.length === 0) return;
-    if (!confirm("确定清空所有标注线条？")) return;
+    if (markers.length === 0) return;
+    if (!confirm("确定清空所有标注？")) return;
     clearAnnotations();
     setHint("已清空全部标注");
   });