Rotate marker along a line inside polygon - maps
I am working with polygons(could be irregular) in maps. I need to show a label at the center of the polygon. I am using a marker for label and I have figured out a center.
The problem is I need to rotate the label as well so that the label is inside the polygon, as much as possible. I need to align it on a line, so I thought to find the slope of the line and rotate the label along the tan inverse of slope. Below is a part of code that I have tried.
//(startLat, startLon) and (endLat, endLon)
var dy= (endLon - startLon);
var dx= (endLat - startLat);
var angle = Math.Atan(dy/ dx);
It is slope of a line formula.
But this is not fetching the correct result. The angle seems incorrect. When I rotate the label along this angle, it seems too much rotation. I don't understand where I am going wrong. Is it wrong because I am trying to find slope of a line but actually its an arc? But I think since its a small arc on a large sphere, it could be treated as a line.
Can anybody point out where I am going wrong and how I can achieve this?
Current Label position
Required Label position
maps markers
asked Dec 19 '18 at 14:53
itzcutiesushitzcutiesush
3918
add a comment |
I am working with polygons(could be irregular) in maps. I need to show a label at the center of the polygon. I am using a marker for label and I have figured out a center.
The problem is I need to rotate the label as well so that the label is inside the polygon, as much as possible. I need to align it on a line, so I thought to find the slope of the line and rotate the label along the tan inverse of slope. Below is a part of code that I have tried.
//(startLat, startLon) and (endLat, endLon)
var dy= (endLon - startLon);
var dx= (endLat - startLat);
var angle = Math.Atan(dy/ dx);
It is slope of a line formula.
But this is not fetching the correct result. The angle seems incorrect. When I rotate the label along this angle, it seems too much rotation. I don't understand where I am going wrong. Is it wrong because I am trying to find slope of a line but actually its an arc? But I think since its a small arc on a large sphere, it could be treated as a line.
Can anybody point out where I am going wrong and how I can achieve this?
Current Label position
Required Label position
maps markers
asked Dec 19 '18 at 14:53
itzcutiesushitzcutiesush
3918
add a comment |
I am working with polygons(could be irregular) in maps. I need to show a label at the center of the polygon. I am using a marker for label and I have figured out a center.
The problem is I need to rotate the label as well so that the label is inside the polygon, as much as possible. I need to align it on a line, so I thought to find the slope of the line and rotate the label along the tan inverse of slope. Below is a part of code that I have tried.
//(startLat, startLon) and (endLat, endLon)
var dy= (endLon - startLon);
var dx= (endLat - startLat);
var angle = Math.Atan(dy/ dx);
It is slope of a line formula.
But this is not fetching the correct result. The angle seems incorrect. When I rotate the label along this angle, it seems too much rotation. I don't understand where I am going wrong. Is it wrong because I am trying to find slope of a line but actually its an arc? But I think since its a small arc on a large sphere, it could be treated as a line.
Can anybody point out where I am going wrong and how I can achieve this?
Current Label position
Required Label position
maps markers
asked Dec 19 '18 at 14:53
itzcutiesushitzcutiesush
3918
I am working with polygons(could be irregular) in maps. I need to show a label at the center of the polygon. I am using a marker for label and I have figured out a center.
The problem is I need to rotate the label as well so that the label is inside the polygon, as much as possible. I need to align it on a line, so I thought to find the slope of the line and rotate the label along the tan inverse of slope. Below is a part of code that I have tried.
//(startLat, startLon) and (endLat, endLon)
var dy= (endLon - startLon);
var dx= (endLat - startLat);
var angle = Math.Atan(dy/ dx);
It is slope of a line formula.
But this is not fetching the correct result. The angle seems incorrect. When I rotate the label along this angle, it seems too much rotation. I don't understand where I am going wrong. Is it wrong because I am trying to find slope of a line but actually its an arc? But I think since its a small arc on a large sphere, it could be treated as a line.
Can anybody point out where I am going wrong and how I can achieve this?
Current Label position
Required Label position
maps markers
maps markers
asked Dec 19 '18 at 14:53
itzcutiesushitzcutiesush
3918
asked Dec 19 '18 at 14:53
itzcutiesushitzcutiesush
3918
edited Jan 1 at 9:02
itzcutiesush
asked Dec 19 '18 at 14:53
itzcutiesushitzcutiesush
3918
asked Dec 19 '18 at 14:53
itzcutiesushitzcutiesush
3918
asked Dec 19 '18 at 14:53
itzcutiesushitzcutiesush
3918
3918
add a comment |
add a comment |
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