电子签名

src/components/miliu-autograph/miliu-autograph.vue

@@ -68,13 +68,17 @@ if (memberStore.userInfo.nickName && memberStore.userInfo.nickName.length < 5) {
   nickName.value = '正楷字书写'
 }
 
+const paths = ref([]) // 保存所有笔迹（每笔是一组点数组）
+const PEN = { width: 6, color: '#000000' } // 若你已有类似配置可复用
+
 watch(
   () => props.modelValue,
   (val) => {
     if (val) {
       // 小延时确保 canvas 已经渲染
       setTimeout(() => {
-        uni.createSelectorQuery()
+        uni
+          .createSelectorQuery()
           .in(_this)
           .select('#mycanvas')
           .fields({ size: true, rect: true }, (data) => {
@@ -86,7 +90,7 @@ watch(
           .exec()
       }, 50) // 可以尝试 30~100ms，根据实际机型调整
     }
-  }
+  },
 )
 
 const showRotateToast = (msg) => {
@@ -143,43 +147,62 @@ const drawBackground = (ctx, width = 100, height = 100) => {
 
 // 触摸开始
 const touchstart = (e) => {
-  let startX = e.changedTouches[0].x
-  let startY = e.changedTouches[0].y
-  let startPoint = { X: startX, Y: startY }
-  points.push(startPoint)
+  const x = e.changedTouches[0].x
+  const y = e.changedTouches[0].y
+  const p = { X: x, Y: y }
+
+  // 新开一条路径并保存第一个点
+  paths.value.push([p])
+
+  // 立即在可见画布上开始一段（方便用户看到）
+  canvaCtx.setLineWidth(PEN.width)
+  canvaCtx.setStrokeStyle(PEN.color)
+  canvaCtx.setLineCap('round')
+  canvaCtx.setLineJoin('round')
+
   canvaCtx.beginPath()
-}
-// 触摸移动
-const touchmove = (e) => {
-  let moveX = e.changedTouches[0].x
-  let moveY = e.changedTouches[0].y
-  let movePoint = { X: moveX, Y: moveY }
-  points.push(movePoint)
-  if (points.length >= 2) {
-    draw()
-		hasDrawn.value = true // 标记已签名
-  }
-}
-// 绘制
-const draw = () => {
-  if (points.length < 2) return
-  canvaCtx.beginPath()
-  canvaCtx.moveTo(points[0].X, points[0].Y)
-  for (let i = 1; i < points.length; i++) {
-    canvaCtx.lineTo(points[i].X, points[i].Y)
-  }
+  canvaCtx.moveTo(x, y)
+  // 画一个极短的线段以显示起点（某些设备单点才会丢失）
+  canvaCtx.lineTo(x + 0.1, y + 0.1)
   canvaCtx.stroke()
   canvaCtx.draw(true)
-  points = [points[points.length - 1]]
 }
-// 触摸结束
+
+const touchmove = (e) => {
+  const x = e.changedTouches[0].x
+  const y = e.changedTouches[0].y
+  const p = { X: x, Y: y }
+
+  // 把点推入当前路径
+  const cur = paths.value[paths.value.length - 1]
+  if (cur) cur.push(p)
+
+  // 在可见画布上增量画这段
+  canvaCtx.setLineWidth(PEN.width)
+  canvaCtx.setStrokeStyle(PEN.color)
+  canvaCtx.setLineCap('round')
+  canvaCtx.setLineJoin('round')
+
+  if (cur && cur.length >= 2) {
+    const prev = cur[cur.length - 2]
+    canvaCtx.beginPath()
+    canvaCtx.moveTo(prev.X, prev.Y)
+    canvaCtx.lineTo(p.X, p.Y)
+    canvaCtx.stroke()
+    canvaCtx.draw(true)
+  }
+}
+
 const touchend = () => {
+  // 不清 paths，保留以便导出；清掉临时 points（如果你还用 points）
   points = []
+  hasDrawn.value = paths.value.length > 0
 }
 // 清空画布
 const clear = () => {
   return new Promise((resolve, reject) => {
-    uni.createSelectorQuery()
+    uni
+      .createSelectorQuery()
       .in(_this)
       .select('#mycanvas')
       .fields({ size: true, rect: true }, (data) => {
@@ -188,9 +211,14 @@ const clear = () => {
           return
         }
         const { width, height } = data
+        // 清空像素
         canvaCtx.clearRect(0, 0, width, height)
+        // flush 清空，再画背景（drawBackground 会 ctx.draw）
         canvaCtx.draw(false, () => {
-          drawBackground(canvaCtx, width, height) // ⚡ 保证背景立即重绘
+          // 重绘背景（你的 drawBackground 会自己 ctx.draw）
+          drawBackground(canvaCtx, width, height)
+          // 清空笔迹记录
+          paths.value = []
           hasDrawn.value = false
           resolve()
         })
@@ -205,11 +233,73 @@ const confirm = () => {
     showRotateToast('请先签名再确认')
     return
   }
-  uni.canvasToTempFilePath({ canvasId: 'mycanvas' }, _this, _this.parent).then((res) => {
+
+  uni
+    .createSelectorQuery()
+    .in(_this)
+    .select('#mycanvas')
+    .fields({ size: true, rect: true }, (data) => {
+      if (!data) return
+      const { width, height } = data
+
+      // 1) 清空整个画布（包括背景）
+      canvaCtx.clearRect(0, 0, width, height)
+
+      // 2) 在画布上只重绘笔迹（不画背景）
+      canvaCtx.setLineWidth(PEN.width)
+      canvaCtx.setStrokeStyle(PEN.color)
+      canvaCtx.setLineCap('round')
+      canvaCtx.setLineJoin('round')
+      canvaCtx.setFillStyle(PEN.color)
+
+      paths.value.forEach((path) => {
+        if (!path || !path.length) return
+        if (path.length === 1) {
+          // 单点：画小圆点
+          const p = path[0]
+          canvaCtx.beginPath()
+          canvaCtx.arc(p.X, p.Y, Math.max(1, PEN.width / 2), 0, Math.PI * 2)
+          canvaCtx.fill()
+        } else {
+          canvaCtx.beginPath()
+          canvaCtx.moveTo(path[0].X, path[0].Y)
+          for (let i = 1; i < path.length; i++) {
+            canvaCtx.lineTo(path[i].X, path[i].Y)
+          }
+          canvaCtx.stroke()
+        }
+      })
+
+      // 3) flush 并在回调中导出（确保像素已写入）
+      canvaCtx.draw(false, () => {
+        uni
+          .canvasToTempFilePath(
+            {
+              canvasId: 'mycanvas',
+              width,
+              height,
+              destWidth: width,
+              destHeight: height,
+              fileType: 'png',
+              quality: 1,
+            },
+            _this,
+            _this.parent,
+          )
+          .then((res) => {
             emits('complete', res.tempFilePath)
+            // 直接关闭（按你要求：不再恢复背景）
             cancel()
           })
+          .catch((err) => {
+            console.error('导出签名失败', err)
+            showRotateToast('导出失败，请重试')
+          })
+      })
+    })
+    .exec()
 }
+
 // 取消
 const cancel = () => {
   clear().then(() => emits('update:modelValue', false))