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67 lines
1.4 KiB
67 lines
1.4 KiB
// |
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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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