管线横断面分析代码 vue写法

管线横断面分析可以用Vue框架来实现，具体实现步骤如下：

1. 创建一个vue组件，在组件中定义数据和方法。

<template>
  <div>
    <!--显示管线横断面图-->
    <canvas ref="canvas"></canvas>
    <!--选择管线-->
    <select v-model="selectedPipe">
      <option v-for="pipe in pipes" :key="pipe.id" :value="pipe.id">{{pipe.name}}</option>
    </select>
    <!--计算按钮-->
    <button @click="calculate">计算</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      pipes: [
        { id: 1, name: "水管1", data: [...] },
        { id: 2, name: "水管2", data: [...] },
        { id: 3, name: "水管3", data: [...] }
      ],
      selectedPipe: 1
    };
  },
  methods: {
    calculate() {
      //执行计算逻辑
    }
  }
};
</script>

2. 在mounted钩子函数中初始化canvas对象，并在watch钩子函数中监听数据变化，更新管线横断面图。

<template>
  <div>
    <!--显示管线横断面图-->
    <canvas ref="canvas"></canvas>
    <!--选择管线-->
    <select v-model="selectedPipe">
      <option v-for="pipe in pipes" :key="pipe.id" :value="pipe.id">{{pipe.name}}</option>
    </select>
    <!--计算按钮-->
    <button @click="calculate">计算</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      pipes: [
        { id: 1, name: "水管1", data: [...] },
        { id: 2, name: "水管2", data: [...] },
        { id: 3, name: "水管3", data: [...] }
      ],
      selectedPipe: 1
    };
  },
  mounted() {
    const canvas = this.$refs.canvas;
    const ctx = canvas.getContext("2d");
    //绘制初始横断面图
    this.drawChart(ctx, this.pipes[0].data);
  },
  watch: {
    selectedPipe(val) {
      const canvas = this.$refs.canvas;
      const ctx = canvas.getContext("2d");
      //绘制选中管线的横断面图
      this.drawChart(ctx, this.pipes[val - 1].data);
    }
  },
  methods: {
    calculate() {
      //执行计算逻辑
    },
    drawChart(ctx, data) {
      //绘制横断面图
    }
  }
};
</script>

3. 在drawChart方法中实现绘制横断面图的逻辑。

<template>
  <div>
    <!--显示管线横断面图-->
    <canvas ref="canvas"></canvas>
    <!--选择管线-->
    <select v-model="selectedPipe">
      <option v-for="pipe in pipes" :key="pipe.id" :value="pipe.id">{{pipe.name}}</option>
    </select>
    <!--计算按钮-->
    <button @click="calculate">计算</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      pipes: [
        { id: 1, name: "水管1", data: [...] },
        { id: 2, name: "水管2", data: [...] },
        { id: 3, name: "水管3", data: [...] }
      ],
      selectedPipe: 1
    };
  },
  mounted() {
    const canvas = this.$refs.canvas;
    const ctx = canvas.getContext("2d");
    //绘制初始横断面图
    this.drawChart(ctx, this.pipes[0].data);
  },
  watch: {
    selectedPipe(val) {
      const canvas = this.$refs.canvas;
      const ctx = canvas.getContext("2d");
      //绘制选中管线的横断面图
      this.drawChart(ctx, this.pipes[val - 1].data);
    }
  },
  methods: {
    calculate() {
      //执行计算逻辑
    },
    drawChart(ctx, data) {
      //清空画布
      ctx.clearRect(0, 0, canvas.width, canvas.height);

      //绘制坐标轴
      ctx.beginPath();
      ctx.moveTo(50, canvas.height - 50);
      ctx.lineTo(canvas.width - 50, canvas.height - 50);
      ctx.stroke();
      ctx.beginPath();
      ctx.moveTo(50, 50);
      ctx.lineTo(50, canvas.height - 50);
      ctx.stroke();

      //绘制数据曲线
      ctx.beginPath();
      ctx.moveTo(50, canvas.height - 50);
      for (let i = 0; i < data.length; i++) {
        const x = 50 + ((canvas.width - 100) / (data.length - 1)) * i;
        const y = canvas.height - 50 - ((canvas.height - 100) / (Math.max(...data) - Math.min(...data))) * (data[i] - Math.min(...data));
        ctx.lineTo(x, y);
      }
      ctx.stroke();
    }
  }
};
</script>

以上代码只是示例代码，实际的管线横断面分析需要根据具体需求进行修改。