iOS 地图线路动态可视化显示

#pragma mark - 驾车线路检索
- (void)onGetDrivingRouteResult:(BMKRouteSearch*)searcher result:(BMKDrivingRouteResult*)result errorCode:(BMKSearchErrorCode)error
{
if (error == BMK_SEARCH_NO_ERROR) {
//在此处理正常结果
NSArray* array = [NSArray arrayWithArray:_mapView.annotations];
[_mapView removeAnnotations:array];
array = [NSArray arrayWithArray:_mapView.overlays];
[_mapView removeOverlays:array];
if (error == BMK_SEARCH_NO_ERROR) {
BMKDrivingRouteLine* plan = (BMKDrivingRouteLine*)[result.routes objectAtIndex:0];
// 计算路线方案中的路段数目
int size = [plan.steps count];
int planPointCounts = 0;
for (int i = 0; i < size; i++) {
BMKDrivingStep* transitStep = [plan.steps objectAtIndex:i];
if(i==0){
RouteAnnotation* item = [[RouteAnnotation alloc]init];
item.coordinate = plan.starting.location;
item.title = @"起点";
item.type = 0;
[_mapView addAnnotation:item]; // 添加起点标注

}else if(i==size-1){
RouteAnnotation* item = [[RouteAnnotation alloc]init];
item.coordinate = plan.terminal.location;
item.title = @"终点";
item.type = 1;
[_mapView addAnnotation:item]; // 添加起点标注
}
//添加annotation节点
RouteAnnotation* item = [[RouteAnnotation alloc]init];
item.coordinate = transitStep.entrace.location;
item.title = transitStep.entraceInstruction;
item.degree = transitStep.direction * 30;
item.type = 4;
[_mapView addAnnotation:item];
//轨迹点总数累计
planPointCounts += transitStep.pointsCount;

//-----------------------------------------------------------

if (i==0) {
//以第一个坐标点做初始值
minLat = plan.starting.location.latitude;
maxLat = plan.starting.location.latitude;
minLon = plan.starting.location.longitude;
maxLon = plan.starting.location.longitude;
}else{
//对比筛选出最小纬度，最大纬度；最小经度，最大经度
minLat = MIN(minLat, transitStep.entrace.location.latitude);
maxLat = MAX(maxLat, transitStep.entrace.location.latitude);
minLon = MIN(minLon, transitStep.entrace.location.longitude);
maxLon = MAX(maxLon, transitStep.entrace.location.longitude);
}

//-----------------------------------------------------------
}

[self setVisibleRegin];

// 添加途经点
if (plan.wayPoints) {
for (BMKPlanNode* tempNode in plan.wayPoints) {
RouteAnnotation* item = [[RouteAnnotation alloc]init];
item = [[RouteAnnotation alloc]init];
item.coordinate = tempNode.pt;
item.type = 5;
item.title = tempNode.name;
[_mapView addAnnotation:item];
}
}
//轨迹点
BMKMapPoint * temppoints = new BMKMapPoint[planPointCounts];
int i = 0;
for (int j = 0; j < size; j++) {
BMKDrivingStep* transitStep = [plan.steps objectAtIndex:j];
int k=0;
for(k=0;k<transitStep.pointsCount;k++) {
temppoints[i].x = transitStep.points[k].x;
temppoints[i].y = transitStep.points[k].y;
i++;
}

}
// 通过points构建BMKPolyline

BMKPolyline* polyLine = [BMKPolyline polylineWithPoints:temppoints count:planPointCounts];
[_mapView addOverlay:polyLine]; // 添加路线overlay
delete []temppoints;

}
}
else {
NSLog(@"抱歉，未找到结果");
}
}

- (void)setVisibleRegin
{
//计算中心点
CLLocationCoordinate2D centCoor;
centCoor.latitude = (CLLocationDegrees)((maxLat+minLat) * 0.5f);
centCoor.longitude = (CLLocationDegrees)((maxLon+minLon) * 0.5f);
BMKCoordinateSpan span;
//计算地理位置的跨度
span.latitudeDelta = maxLat - minLat;
span.longitudeDelta = maxLon - minLon;
//得出数据的坐标区域
BMKCoordinateRegion region = BMKCoordinateRegionMake(centCoor, span);

//百度地图的坐标范围转换成相对视图的位置
CGRect fitRect = [_mapView convertRegion:region toRectToView:_mapView];
//将地图视图的位置转换成地图的位置，
BMKMapRect fitMapRect = [_mapView convertRect:fitRect toMapRectFromView:_mapView];
//设置地图可视范围为数据所在的地图位置
[_mapView setVisibleMapRect:fitMapRect animated:YES];
}