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Viewing changes to src/libprojection/ProjectionRectangular.cpp

  • Committer: Bazaar Package Importer
  • Author(s): LaMont Jones
  • Date: 2004-08-24 07:14:00 UTC
  • mfrom: (1.1.1 upstream)
  • Revision ID: james.westby@ubuntu.com-20040824071400-2dr4qnjbjmm8z3ia
Tags: 1.0.6-1ubuntu1
Build-depend: libtiff4-dev

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src/libprojection/ProjectionRectangular.cpp
 
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#include <cmath>
 
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using namespace std;
 
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#include "ProjectionRectangular.h"
 
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#include "xpUtil.h"
 
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ProjectionRectangular::ProjectionRectangular(const int f, const int w,
 
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                                             const int h) 
 
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    : ProjectionBase (f, w, h),
 
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      mapBounds_(false)
 
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{
 
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    isWrapAround_ = true;
 
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    startLon_ = -M_PI + centerLon_;
 
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    startLat_ = M_PI_2;
 
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    delLat_ = M_PI/height_;
 
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    delLon_ = TWO_PI/width_;
 
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}
 
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ProjectionRectangular::ProjectionRectangular(const int f, const int w, 
 
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                                             const int h,
 
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                                             const double startLat,
 
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                                             const double startLon,
 
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                                             const double mapHeight,
 
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                                             const double mapWidth)
 
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    : ProjectionBase (f, w, h), mapBounds_(true)
 
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{
 
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    startLon_ = startLon * f;
 
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    startLat_ = startLat;
 
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    delLat_ = mapHeight/height_;
 
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    delLon_ = mapWidth/width_ * f;
 
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}
 
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bool
 
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ProjectionRectangular::pixelToSpherical(const double x, const double y, 
 
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                                        double &lon, double &lat)
 
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{
 
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    lon = (x + 0.5) * delLon_ + startLon_;
 
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    lat = startLat_ - (y + 0.5) * delLat_;
 
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    return(true);
 
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}
 
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bool
 
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ProjectionRectangular::sphericalToPixel(double lon, double lat,
 
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                                        double &x, double &y) const
 
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{
 
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    if (lon > M_PI) lon -= TWO_PI;
 
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    else if (lon < -M_PI) lon += TWO_PI;
 
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    x = (lon - startLon_)/delLon_;
 
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    if (!mapBounds_)
 
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    {
 
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        if (x >= width_) 
 
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            x -= width_;
 
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        else if (x < 0) 
 
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            x += width_;
 
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    }
 
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    y = (startLat_ - lat)/delLat_;
 
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    if (!mapBounds_ && y >= height_) y = height_ - 1;
 
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    return(true);
 
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}
 
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