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68 lines
1.4 KiB
68 lines
1.4 KiB
2 years ago
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//
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// Util.m
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// test
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//
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// Created by yi chen on 3/24/15.
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// Copyright (c) 2015 yi chen. All rights reserved.
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//
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#import "Util.h"
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@implementation Util
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+ (CLLocationDirection)calculateCourseFromMapPoint:(MKMapPoint)p1 to:(MKMapPoint)p2
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{
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//20级坐标y轴向下，需要反过来。
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MKMapPoint dp = MKMapPointMake(p2.x - p1.x, p1.y - p2.y);
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if (dp.y == 0)
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{
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return dp.x < 0? 270.f:0.f;
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}
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double dir = atan(dp.x/dp.y) * 180.f / M_PI;
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if (dp.y > 0)
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{
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if (dp.x < 0)
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{
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dir = dir + 360.f;
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}
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}else
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{
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dir = dir + 180.f;
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}
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return dir;
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}
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+ (CLLocationDirection)calculateCourseFromCoordinate:(CLLocationCoordinate2D)coord1 to:(CLLocationCoordinate2D)coord2
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{
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MKMapPoint p1 = MKMapPointForCoordinate(coord1);
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MKMapPoint p2 = MKMapPointForCoordinate(coord2);
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return [self calculateCourseFromMapPoint:p1 to:p2];
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}
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+ (CLLocationDirection)fixNewDirection:(CLLocationDirection)newDir basedOnOldDirection:(CLLocationDirection)oldDir
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{
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//the gap between newDir and oldDir would not exceed 180.f degrees
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CLLocationDirection turn = newDir - oldDir;
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if(turn > 180.f)
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{
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return newDir - 360.f;
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}
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else if (turn < -180.f)
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{
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return newDir + 360.f;
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}
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else
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{
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return newDir;
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}
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}
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@end
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