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Leaflet dm and semicricle

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

0

I am trying to measure and show angle using semicircle library. It would measure angle between two vertices being drawn with PM Leaflet library.

Measuring angles is good, however, drawn semicircle line and the angle lines are not overlapping. I noticed they are overlapping perfectly near 0,0 coordinates but if I try to apply this action near poles, as you suppose, distortion is great.

My code for capturing angle and creating circle.

function captureMove(evt, p1, p2){

  let firstAngle = Math.atan2(p2[0] - p1[0], p2[1] - p1[1]) * 180 / Math.PI - 90;

  let secondAngle = Math.atan2(evt.latlng.lat - p1[0], evt.latlng.lng - p1[1]) * 180 / Math.PI - 90;

  firstAngle < 0? firstAngle +=360:''

  secondAngle < 0? secondAngle +=360:''

  rightClick? createCircle(p1, secondAngle, firstAngle): createCircle(p1, firstAngle, secondAngle);

}

Creating circle:

   function createCircle(p1, ang1, ang2){

  let noOfLayers = temLayer.getLayers();

  if(noOfLayers.length > 1){

    temLayer.removeLayer(noOfLayers[1]);

  } 

  ang1 < ang2?ang1+=360:''

  var circle = L.semiCircle(p1, {

      radius: 1000,

        startAngle: 360 - ang1,

        stopAngle: 360 - ang2,

        color: 'rgba(255,0,0,0.5)',

    });

  temLayer.addLayer(circle);

};

What could cause this? I realize it is projection distortion. But how to solve this?

leaflet

share

asked 5 mins ago

KumbraKumbra

15

add a comment | 

0

I am trying to measure and show angle using semicircle library. It would measure angle between two vertices being drawn with PM Leaflet library.

Measuring angles is good, however, drawn semicircle line and the angle lines are not overlapping. I noticed they are overlapping perfectly near 0,0 coordinates but if I try to apply this action near poles, as you suppose, distortion is great.

My code for capturing angle and creating circle.

function captureMove(evt, p1, p2){

  let firstAngle = Math.atan2(p2[0] - p1[0], p2[1] - p1[1]) * 180 / Math.PI - 90;

  let secondAngle = Math.atan2(evt.latlng.lat - p1[0], evt.latlng.lng - p1[1]) * 180 / Math.PI - 90;

  firstAngle < 0? firstAngle +=360:''

  secondAngle < 0? secondAngle +=360:''

  rightClick? createCircle(p1, secondAngle, firstAngle): createCircle(p1, firstAngle, secondAngle);

}

Creating circle:

   function createCircle(p1, ang1, ang2){

  let noOfLayers = temLayer.getLayers();

  if(noOfLayers.length > 1){

    temLayer.removeLayer(noOfLayers[1]);

  } 

  ang1 < ang2?ang1+=360:''

  var circle = L.semiCircle(p1, {

      radius: 1000,

        startAngle: 360 - ang1,

        stopAngle: 360 - ang2,

        color: 'rgba(255,0,0,0.5)',

    });

  temLayer.addLayer(circle);

};

What could cause this? I realize it is projection distortion. But how to solve this?

leaflet

share

asked 5 mins ago

KumbraKumbra

15

add a comment | 

I am trying to measure and show angle using semicircle library. It would measure angle between two vertices being drawn with PM Leaflet library.

Measuring angles is good, however, drawn semicircle line and the angle lines are not overlapping. I noticed they are overlapping perfectly near 0,0 coordinates but if I try to apply this action near poles, as you suppose, distortion is great.

My code for capturing angle and creating circle.

function captureMove(evt, p1, p2){

  let firstAngle = Math.atan2(p2[0] - p1[0], p2[1] - p1[1]) * 180 / Math.PI - 90;

  let secondAngle = Math.atan2(evt.latlng.lat - p1[0], evt.latlng.lng - p1[1]) * 180 / Math.PI - 90;

  firstAngle < 0? firstAngle +=360:''

  secondAngle < 0? secondAngle +=360:''

  rightClick? createCircle(p1, secondAngle, firstAngle): createCircle(p1, firstAngle, secondAngle);

}

Creating circle:

   function createCircle(p1, ang1, ang2){

  let noOfLayers = temLayer.getLayers();

  if(noOfLayers.length > 1){

    temLayer.removeLayer(noOfLayers[1]);

  } 

  ang1 < ang2?ang1+=360:''

  var circle = L.semiCircle(p1, {

      radius: 1000,

        startAngle: 360 - ang1,

        stopAngle: 360 - ang2,

        color: 'rgba(255,0,0,0.5)',

    });

  temLayer.addLayer(circle);

};

What could cause this? I realize it is projection distortion. But how to solve this?

leaflet

share

asked 5 mins ago

KumbraKumbra

15

function captureMove(evt, p1, p2){

  let firstAngle = Math.atan2(p2[0] - p1[0], p2[1] - p1[1]) * 180 / Math.PI - 90;

  let secondAngle = Math.atan2(evt.latlng.lat - p1[0], evt.latlng.lng - p1[1]) * 180 / Math.PI - 90;

  firstAngle < 0? firstAngle +=360:''

  secondAngle < 0? secondAngle +=360:''

  rightClick? createCircle(p1, secondAngle, firstAngle): createCircle(p1, firstAngle, secondAngle);

}

   function createCircle(p1, ang1, ang2){

  let noOfLayers = temLayer.getLayers();

  if(noOfLayers.length > 1){

    temLayer.removeLayer(noOfLayers[1]);

  } 

  ang1 < ang2?ang1+=360:''

  var circle = L.semiCircle(p1, {

      radius: 1000,

        startAngle: 360 - ang1,

        stopAngle: 360 - ang2,

        color: 'rgba(255,0,0,0.5)',

    });

  temLayer.addLayer(circle);

};

share

asked 5 mins ago

KumbraKumbra

15

share

asked 5 mins ago

KumbraKumbra

15

asked 5 mins ago

KumbraKumbra

15

asked 5 mins ago

KumbraKumbra

15