com/gradoservice/proj4as/proj/ProjEqc.as

   1 package com.gradoservice.proj4as.proj\r
   2 {\r
   3         import com.gradoservice.proj4as.ProjPoint;\r
   4         import com.gradoservice.proj4as.ProjConstants;\r
   5         import com.gradoservice.proj4as.Datum;\r
   6                 \r
   7         public class ProjEqc extends AbstractProjProjection\r
   8         {\r
   9                 public function ProjEqc(data:ProjParams)\r
  10                 {\r
  11                         super(data);\r
  12                 }\r
  13                 \r
  14                 override public function init():void \r
  15                 {\r
  16                 if(!this.x0) this.x0=0;\r
  17                 if(!this.y0) this.y0=0;\r
  18                 if(!this.lat0) this.lat0=0;\r
  19                 if(!this.long0) this.long0=0;\r
  20                 if(!this.lat_ts) this.lat_ts=0;\r
  21                 if (!this.title) this.title = "Equidistant Cylindrical (Plate Carre)";\r
  22                 this.rc= Math.cos(this.lat_ts);\r
  23         }\r
  24 \r
  25 \r
  26     // forward equations--mapping lat,long to x,y\r
  27     // -----------------------------------------------------------------\r
  28         override public function forward(p:ProjPoint):ProjPoint \r
  29         {\r
  30         var lon:Number= p.x;\r
  31         var lat:Number= p.y;\r
  32         \r
  33         var dlon:Number = ProjConstants.adjust_lon(lon - this.long0);\r
  34         var dlat:Number = ProjConstants.adjust_lat(lat - this.lat0 );\r
  35         p.x= this.x0 + (this.a*dlon*this.rc);\r
  36         p.y= this.y0 + (this.a*dlat        );\r
  37         return p;\r
  38         }\r
  39 \r
  40   // inverse equations--mapping x,y to lat/long\r
  41   // -----------------------------------------------------------------\r
  42                 override public function inverse(p:ProjPoint):ProjPoint \r
  43                 {\r
  44         var x:Number= p.x;\r
  45         var y:Number= p.y;\r
  46 \r
  47         p.x= ProjConstants.adjust_lon(this.long0 + ((x - this.x0)/(this.a*this.rc)));\r
  48         p.y= ProjConstants.adjust_lat(this.lat0  + ((y - this.y0)/(this.a        )));\r
  49                 return p;\r
  50                 }\r
  51 \r
  52                 \r
  53                 \r
  54         }\r
  55 }