abstractannotationlayout.java

world wind java sdk 源码

/* Copyright (C) 2001, 2009 United States Government as represented by
the Administrator of the National Aeronautics and Space Administration.
All Rights Reserved.
*/
package gov.nasa.worldwind.render;

import gov.nasa.worldwind.pick.PickSupport;
import gov.nasa.worldwind.util.*;
import gov.nasa.worldwind.geom.Position;

import javax.media.opengl.GL;

/**
 * @author dcollins
 * @version $Id: AbstractAnnotationLayout.java 10542 2009-04-27 17:28:30Z dcollins $
 */
public abstract class AbstractAnnotationLayout implements AnnotationLayoutManager
{
    protected OGLStackHandler stackHandler;
    protected PickSupport pickSupport;

    protected AbstractAnnotationLayout()
    {
        this.stackHandler = new OGLStackHandler();
    }

    public PickSupport getPickSupport()
    {
        return this.pickSupport;
    }

    public void setPickSupport(PickSupport pickSupport)
    {
        this.pickSupport = pickSupport;
    }

    public void beginDrawAnnotations(DrawContext dc, java.awt.Rectangle bounds)
    {
        if (dc == null)
        {
            String message = Logging.getMessage("nullValue.DrawContextIsNull");
            Logging.logger().severe(message);
            throw new IllegalArgumentException(message);
        }

        if (bounds == null)
        {
            String message = Logging.getMessage("nullValue.RectangleIsNull");
            Logging.logger().severe(message);
            throw new IllegalArgumentException(message);
        }

        GL gl = dc.getGL();
        this.stackHandler.pushModelview(gl);
    }

    public void endDrawAnnotations(DrawContext dc)
    {
        if (dc == null)
        {
            String message = Logging.getMessage("nullValue.DrawContextIsNull");
            Logging.logger().severe(message);
            throw new IllegalArgumentException(message);
        }

        GL gl = dc.getGL();
        this.stackHandler.pop(gl);
    }

    protected java.awt.Dimension getAnnotationSize(DrawContext dc, Annotation annotation)
    {
        try
        {
            return annotation.getPreferredSize(dc);
        }
        catch (Exception e)
        {
            // Trap and log exceptions thrown by computing an annotation's preferred size. This will prevent one
            // annotation from throwing an exception and preventing all other anotations from reporting their
            // preferred size.
            String message = Logging.getMessage("generic.ExceptionWhileComputingSize", annotation);
            Logging.logger().log(java.util.logging.Level.SEVERE, message, e);
        }

        return null;
    }

    protected void drawAnnotation(DrawContext dc, Annotation annotation, int width, int height, double opacity,
        Position pickPosition)
    {
        try
        {
            if (this.pickSupport != null)
                annotation.setPickSupport(this.pickSupport);
            
            annotation.draw(dc, width, height, opacity, pickPosition);
        }
        catch (Exception e)
        {
            // Trap and log exceptions thrown by rendering an annotation. This will prevent one annotation from
            // throwing an exception and preventing all other anotations from rendering.
            String message = Logging.getMessage("generic.ExceptionWhileRenderingAnnotation", annotation);
            Logging.logger().log(java.util.logging.Level.SEVERE, message, e);
        }
    }
}