首頁猿問 SharpMap畫圓怎么畫?

SharpMap畫圓怎么畫?

.NET

慕姐8265434 2018-08-10 12:09:25

SharpMap畫圓是.net winform 希望會的教教...弄了兩天，也沒弄出來..

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2 回答

慕容森

TA貢獻1853條經驗獲得超18個贊

function drawCircle(lat, lng, radius, strokeColor, strokeWidth, strokeOpacity, fillColor, fillOpacity) {
     var d2r = Math.PI / 180;
     var r2d = 180 / Math.PI;
     var Clat = radius * 0.014483;  // Convert statute miles into degrees latitude
     var Clng = Clat / Math.cos(lat * d2r);
     var Cpoints = [];

     // 計算圓周上33個點的經緯度，若需要圓滑些，可以增加圓周的點數
     for (var i = 0; i < 33; i++) {
  var theta = Math.PI * (i / 16);
Cy = lat + (Clat * Math.sin(theta));
Cx = lng + (Clng * Math.cos(theta));
  var P = new GPoint(Cx, Cy);
Cpoints.push(P);
}

strokeColor = strokeColor || "#0055ff";   // 邊框顏色，默認"#0055ff"
strokeWidth = strokeWidth || 1;           // 邊框寬度，默認1px
strokeOpacity = strokeOpacity || 1;       // 邊框透明度，默認不透明
fillColor = fillColor || strokeColor;     // 填充顏色，默認同邊框顏色
fillOpacity = fillOpacity || 0.1;         // 填充透明度，默認0.1

  var polygon = new GPolygon(Cpoints, strokeColor, strokeWidth, strokeOpacity, fillColor, fillOpacity);
map.addOverlay(polygon);
}