1 用途
【历史曲线】控件配合“资料取样”功能一起使用，以曲线图来显示变量的历史数据变化。1.1 使用模式
按“显示类型”分为实时数据、历史数据。
1）实时数据
显示采样数据的实时变化，显示时每1s自动刷新一次。
2）历史数据
显示采样数据的历史记录，需要使用操作接口来前后移动显示。
2 属性
2.1 控件
控件名。
2.2 绑定采样
指定要显示的“资料取样”编号。
2.3 显示类型
1）实时数据：实时刷新
2）历史数据：查看历史，不实时刷新。
2.4 背景
设置实时曲线元件的背景主色、填充色、边框粗细、边框颜色等。
2.5 字体
设置标注文字的颜色、字体。
2.6 图表区
设置曲线显示区域的背景颜色和边框。
2.7 分割线
设置坐标网格的数目、颜色、线宽。
2.8 曲线粗细
设置曲线的粗细和圆点半径。
2.9 X轴
主画线数：竖直网格线，包含两边界上的线
次画线数：两相邻主画线之间的次刻度线数量
主画线长：竖向网格线向下方伸出长度
次画线长：次画线向下方伸出长度
X轴长度、时间单位：组合成X轴的时长。可选择变量关联，动态改变X轴时长
时间格式：当为绝对时钟曲线时的时间格式小数位数：仅相对时钟曲线时，X轴标注的数据格式
最小值：暂无效
不显示X轴标签：打勾不显示
设定X轴的起始坐标值：时间单位选择“小时”有效，功能暂无。
2.10 Y轴
主画线数：说明同X轴
次画线数：说明同X轴
主画线长：说明同X轴
次画线长：说明同X轴
小数位数：Y轴标注的小数位数
最小值：可绑定变量
最大值：可绑定变量
不显示Y轴标签：注意是打勾不显示
2.11 通道设置
设置通道个数和每个通道读取的变量等，绑定采样后自动生成，只需修改是否启用和颜色属性等。
2.12 关联日期
在“历史数据”模式下，绑定变量来控制显示指定日期的历史数据曲线。
可绑定整型变量或字符串变量，格式为：yyyyMMddHHmmss，共14位，不足14位，后面自动补0。
注意：如果超过8位，应使用字符串变量。
2.13 其它属性
其余属性参考其它控件。
3 参考视频
4 历史曲线常用接口
1）navFirst() X轴移动到最前面2）navLast() X轴移动到最后面3）navBack() X坐标向前移动一页4）navNext() X坐标向后移动一页5）moveBack() X坐标向前移动一个主刻度6）moveNext() X坐标向后移动一个主刻度7）hideSeries(wMHistoryTrend2->getSeries(1), true) 设置指定曲线的显示/隐藏状态
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