flutter

更新时间：2022年03月22日

简介

Since 3.1.0 起支持动态轨迹绘制，开发者可以提供轨迹数据，来动态展示轨迹。支持监听轨迹绘制状态。

绘制动态轨迹

示例代码如下：

/// 读取动态轨迹点
String coordinateStrings =
await rootBundle.loadString('resoures/trace_path.txt');

/// string -> list
List<String> coordinateStringList = coordinateStrings.split(',');

/// 动态轨迹点
List<BMFCoordinate> coords = [];
for (var i = 0; i < coordinateStringList.length; i += 2) {
BMFCoordinate coordinate = BMFCoordinate(
double.parse(coordinateStringList[i + 1]),
double.parse(coordinateStringList[i]));
coords.add(coordinate);
}

/// 构造动态轨迹动画参数
BMFTraceOverlayAnimateOption traceOverlayAnimateOption =
BMFTraceOverlayAnimateOption(
animate: true,
delay: 0.0,
duration: 3,

fromValue: 0.0,
toValue: 1.0,
easingCurve: BMFTraceOverlayAnimationEasingCurve.Linear,
trackMove: true);

/// 构造动态轨迹
_traceOverlay = BMFTraceOverlay(
coordinates: coords,
traceOverlayAnimateOption: traceOverlayAnimateOption);
await myMapController.addTraceOverlay(_traceOverlay);

显示效果如图：

https://mapopen-website-wiki.bj.bcebos.com/flutter/static/video/shineFlutter.mp4

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