Package edu.cnu.mdi.mapping.render

Class Etopo5Renderer

java.lang.Object

edu.cnu.mdi.mapping.render.Etopo5Renderer

public class Etopo5Renderer
extends Object

Renders ETOPO5 terrain and bathymetry using the active map projection.

The renderer samples the visible screen area rather than projecting the complete ETOPO5 grid. Each screen block is converted back to geographic coordinates, sampled from the ETOPO5 data set, and filled with an elevation or bathymetry color.

The renderer owns display settings such as opacity and sampling step but does not own an MDI layer. A MapView2D may place this renderer on any ordinary Layer.

Field Summary

Fields

Modifier and Type	Field	Description
static final float	DEFAULT_OPACITY	Default terrain opacity.
static final int	DEFAULT_STEP	Default screen-space sampling step in pixels.

Constructor Summary

Constructors

Constructor	Description
Etopo5Renderer(Etopo5Loader loader)	Creates an ETOPO5 renderer.

Method Summary

Modifier and Type	Method	Description
double	getElevation(double latitudeDeg, double longitudeDeg)	Returns interpolated elevation or bathymetry.
float	getOpacity()	Returns the terrain opacity.
int	getStep()	Returns the screen-space sampling step.
void	render(Graphics2D g2, IContainer container, IMapProjection projection)	Renders the visible portion of the ETOPO5 data.
void	setOpacity(double opacity)	Sets the terrain opacity.
void	setStep(int step)	Sets the screen-space sampling step.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_OPACITY

public static final float DEFAULT_OPACITY

Default terrain opacity.

See Also:

• Constant Field Values

DEFAULT_STEP

public static final int DEFAULT_STEP

Default screen-space sampling step in pixels.

See Also:

• Constant Field Values

Constructor Details

Etopo5Renderer

public Etopo5Renderer(Etopo5Loader loader)

Creates an ETOPO5 renderer.

Parameters:

loader - loaded ETOPO5 data; must not be null

Method Details

render

public void render(Graphics2D g2,
 IContainer container,
 IMapProjection projection)

Renders the visible portion of the ETOPO5 data.

Parameters:

g2 - graphics context

container - map container

projection - active map projection

getElevation

public double getElevation(double latitudeDeg,
 double longitudeDeg)

Returns interpolated elevation or bathymetry.

Parameters:

latitudeDeg - latitude in degrees

longitudeDeg - longitude in degrees

Returns:

elevation in metres, or NaN if unavailable or either coordinate is non-finite

getOpacity

public float getOpacity()

Returns the terrain opacity.

Returns:

opacity in the range [0, 1]

setOpacity

public void setOpacity(double opacity)

Sets the terrain opacity.

Parameters:

opacity - opacity in the range [0, 1]

getStep

public int getStep()

Returns the screen-space sampling step.

Returns:

step in pixels

setStep

public void setStep(int step)

Sets the screen-space sampling step.

Smaller values produce smoother terrain but require more projection and elevation calculations.

Parameters:

step - step in pixels; must be positive