zext.plantuml.com.ctreber.acearth.projection.ProjectionCyl Maven / Gradle / Ivy
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package zext.plantuml.com.ctreber.acearth.projection;
import zext.plantuml.com.ctreber.acearth.util.Coordinate;
import zext.plantuml.com.ctreber.acearth.util.Point3D;
/**
* Cylindrical projection. Show Earth flatly spread out on rectangle.
*
*
© 2002 Christian Treber, [email protected]
* @author Christian Treber, [email protected]
*
*/
public class ProjectionCyl extends Projection
{
/**
*
All of Earth is visible.
*
* @param pPoint
* @return
*/
public boolean isVisible(Point3D pPoint)
{
return true;
}
public Coordinate getLocation(int pX, int pY)
{
final Coordinate lRaw = new Coordinate(Math.atan(inverseFinalizeY(pY)),
inverseFinalizeX(pX));
return rotateReverse(lRaw.getPoint3DRads()).getCoordinate();
}
/**
*
The scale is set so that a value of
* 2PI gets mapped to the full image width times the magnification.
* But see ProjectionOrtho.setScale().
*/
protected void setScale()
{
// Makes 2PI come out as full image width
fScale = fViewMagnification * fImageWidth / (2 * Math.PI);
}
/**
* @return Longitude (-PI to PI), linearly on x axis.
*/
public double projectX(double pX, double pZ)
{
return Math.atan2(pX, pZ);
}
public double inverseProjectX(double pX)
{
return Math.sin(pX);
}
/**
* @return Latitude (-PI/2 to PI/2), projected from center of Earth on
* y axis with a linear scale.
*/
public double projectY(double pY)
{
return (pY >= 0.9999999999) ? 1e6 :
(pY <= -0.9999999999) ? -1e6 : Math.tan(Math.asin(pY));
}
public double inverseProjectY(double y)
{
return Math.sin(Math.atan(y));
}
}