/***********************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Actuate Corporation - initial API and implementation
 ***********************************************************************/

package org.eclipse.birt.chart.event;

import org.eclipse.birt.chart.computation.GObjectFactory;
import org.eclipse.birt.chart.computation.IGObjectFactory;
import org.eclipse.birt.chart.device.IDeviceRenderer;
import org.eclipse.birt.chart.exception.ChartException;
import org.eclipse.birt.chart.model.attribute.Bounds;
import org.eclipse.birt.chart.model.attribute.Fill;
import org.eclipse.birt.chart.model.attribute.LineAttributes;
import org.eclipse.birt.chart.model.attribute.Location;

/**
 * A rendering event type for rendering Arc object.
 */
public class ArcRenderEvent extends PrimitiveRenderEvent
{

	private static final long serialVersionUID = -8516218845415390970L;

	protected static final IGObjectFactory goFactory = GObjectFactory.instance( );

	protected Location loTopLeft = null;

	protected double dWidth;

	protected double dHeight;

	protected double dStartInDegrees;

	protected double dExtentInDegrees;

	protected double dInnerRadius;

	protected double dOuterRadius;

	protected LineAttributes outline;

	protected Fill ifBackground = null;

	protected int iStyle = SECTOR;

	/**
	 * The closure type for an open arc with no path segments connecting the two
	 * ends of the arc segment.
	 */
	public static final int OPEN = 1;

	/**
	 * The closure type for an arc closed by drawing a straight line segment
	 * from the start of the arc segment to the end of the arc segment.
	 */
	public static final int CLOSED = 2;

	/**
	 * The closure type for an arc closed by drawing straight line segments from
	 * the start of the arc segment to the center of the full ellipse and from
	 * that point to the end of the arc segment.
	 */
	public static final int SECTOR = 3;

	/**
	 * The constructor.
	 */
	public ArcRenderEvent( Object oSource )
	{
		super( oSource );
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.event.PrimitiveRenderEvent#reset()
	 */
	public void reset( )
	{
		loTopLeft = null;
		dWidth = 0;
		dHeight = 0;
		dStartInDegrees = 0;
		dExtentInDegrees = 0;
		dInnerRadius = 0;
		dOuterRadius = 0;
		outline = null;
		ifBackground = null;
		iStyle = SECTOR;
	}

	/**
	 * @return Returns the arc style. The value must be one of these defined in
	 *         this class:
	 *         <ul>
	 *         <li>{@link #OPEN}
	 *         <li>{@link #CLOSED}
	 *         <li>{@link #SECTOR}
	 *         </ul>
	 */
	public final int getStyle( )
	{
		return iStyle;
	}

	/**
	 * @param style
	 *            The arc style to set. The value must be one of these defined
	 *            in this class:
	 *            <ul>
	 *            <li>{@link #OPEN}
	 *            <li>{@link #CLOSED}
	 *            <li>{@link #SECTOR}
	 *            </ul>
	 */
	public final void setStyle( int style )
	{
		iStyle = style;
	}

	/**
	 * @return Returns the top left co-ordinates of the bounding elliptical box
	 *         for the arc
	 */
	public final Location getTopLeft( )
	{
		return loTopLeft;
	}

	/**
	 * Sets the top-left location of the containing bounds.
	 * 
	 * @param loTopLeft
	 *            The top left co-ordinates of the bounding elliptical box for
	 *            the arc
	 */
	public final void setTopLeft( Location loTopLeft )
	{
		this.loTopLeft = loTopLeft;
	}

	/**
	 * @return Returns the angle extent of this arc.
	 */
	public final double getAngleExtent( )
	{
		return dExtentInDegrees;
	}

	/**
	 * Sets the angle extent for this arc.
	 * 
	 * @param angleExtent
	 *            The angle extent
	 * @since 2.1
	 */

	public final void setAngleExtent( double angleExtent )
	{
		this.dExtentInDegrees = angleExtent;
	}

	/**
	 * Sets the angle extent for this arc.
	 * 
	 * @param endAngle
	 *            The angle extent
	 * @deprecated Use {@link #setAngleExtent()} instead.
	 */
	public final void setEndAngle( double endAngle )
	{
		this.dExtentInDegrees = endAngle;
	}

	/**
	 * @return Returns the background.
	 */
	public final Fill getBackground( )
	{
		return ifBackground;
	}

	/**
	 * Sets the backgound for this arc.
	 * 
	 * @param ifBackground
	 *            The background to set.
	 */
	public final void setBackground( Fill ifBackground )
	{
		this.ifBackground = ifBackground;
	}

	/**
	 * @return Returns the width of the containing bounds.
	 */
	public double getWidth( )
	{
		return dWidth;
	}

	/**
	 * Sets the width for the containing bounds.
	 * 
	 * @param radius
	 *            The width to set.
	 */
	public void setWidth( double width )
	{
		this.dWidth = width;
	}

	/**
	 * @return Returns the height of the containing bounds.
	 */
	public double getHeight( )
	{
		return dHeight;
	}

	/**
	 * Sets the height for the containing bounds.
	 * 
	 * @param radius
	 *            The height to set.
	 */
	public void setHeight( double height )
	{
		this.dHeight = height;
	}

	/**
	 * @return Returns the startAngle.
	 */
	public final double getStartAngle( )
	{
		return dStartInDegrees;
	}

	/**
	 * Sets the start angle for this arc.
	 * 
	 * @param startAngle
	 *            The startAngle to set.
	 */
	public final void setStartAngle( double startAngle )
	{
		this.dStartInDegrees = startAngle;
	}

	/**
	 * Sets the containing bounds of this arc.
	 * 
	 * @param bo
	 */
	public final void setBounds( Bounds bo )
	{
		setTopLeft( goFactory.createLocation( bo.getLeft( ), bo.getTop( ) ) );
		setWidth( bo.getWidth( ) );
		setHeight( bo.getHeight( ) );
	}

	/**
	 * Returns the full containing bounds of the complete ellipse.
	 * 
	 * @return
	 */
	public Bounds getEllipseBounds( )
	{
		return goFactory.createBounds( loTopLeft.getX( ),
				loTopLeft.getY( ),
				dWidth,
				dHeight );
	}

	private double normalizeDegrees( double angle )
	{
		if ( angle > 180.0 )
		{
			if ( angle <= ( 180.0 + 360.0 ) )
			{
				angle = angle - 360.0;
			}
			else
			{
				angle = Math.IEEEremainder( angle, 360.0 );
				// IEEEremainder can return -180 here for some input values...
				if ( angle == -180.0 )
				{
					angle = 180.0;
				}
			}
		}
		else if ( angle <= -180.0 )
		{
			if ( angle > ( -180.0 - 360.0 ) )
			{
				angle = angle + 360.0;
			}
			else
			{
				angle = Math.IEEEremainder( angle, 360.0 );
				// IEEEremainder can return -180 here for some input values...
				if ( angle == -180.0 )
				{
					angle = 180.0;
				}
			}
		}
		return angle;
	}

	private boolean containsAngle( double angle )
	{
		double angExt = getAngleExtent( );
		boolean backwards = ( angExt < 0.0 );
		if ( backwards )
		{
			angExt = -angExt;
		}
		if ( angExt >= 360 )
		{
			return true;
		}
		angle = normalizeDegrees( angle ) - normalizeDegrees( getStartAngle( ) );
		if ( backwards )
		{
			angle = -angle;
		}
		if ( angle < 0.0 )
		{
			angle += 360.0;
		}

		return ( angle >= 0.0 ) && ( angle < angExt );
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.event.PrimitiveRenderEvent#getBounds()
	 */
	public Bounds getBounds( )
	{
		// calculate the actual bounds.
		double x1, y1, x2, y2;
		if ( getStyle( ) == SECTOR )
		{
			x1 = y1 = x2 = y2 = 0.0;
		}
		else
		{
			x1 = y1 = 1.0;
			x2 = y2 = -1.0;
		}
		double angle = 0.0;
		for ( int i = 0; i < 6; i++ )
		{
			if ( i < 4 )
			{
				// 0-3 are the four quadrants
				angle += 90.0;
				if ( !containsAngle( angle ) )
				{
					continue;
				}
			}
			else if ( i == 4 )
			{
				// 4 is start angle
				angle = getStartAngle( );
			}
			else
			{
				// 5 is end angle
				angle += getAngleExtent( );
			}
			double rads = Math.toRadians( -angle );
			double xe = Math.cos( rads );
			double ye = Math.sin( rads );
			x1 = Math.min( x1, xe );
			y1 = Math.min( y1, ye );
			x2 = Math.max( x2, xe );
			y2 = Math.max( y2, ye );
		}
		double w = getWidth( );
		double h = getHeight( );
		x2 = ( x2 - x1 ) * 0.5 * w;
		y2 = ( y2 - y1 ) * 0.5 * h;
		x1 = getTopLeft( ).getX( ) + ( x1 * 0.5 + 0.5 ) * w;
		y1 = getTopLeft( ).getY( ) + ( y1 * 0.5 + 0.5 ) * h;

		return goFactory.createBounds( x1, y1, x2, y2 );
	}

	/**
	 * @return Returns the outline.
	 */
	public final LineAttributes getOutline( )
	{
		return outline;
	}

	/**
	 * Sets the outline for this arc.
	 * 
	 * @param outline
	 *            The outline to set.
	 */
	public final void setOutline( LineAttributes outline )
	{
		this.outline = outline;
	}

	/**
	 * @return Returns the inner radius for this arc.
	 */
	public double getInnerRadius( )
	{
		return dInnerRadius;
	}

	/**
	 * Sets the inner radius for this arc.
	 * 
	 * @param innerRadius
	 */
	public void setInnerRadius( double innerRadius )
	{
		dInnerRadius = innerRadius;
	}

	/**
	 * @return Returns the outer radius for this arc.
	 */
	public double getOuterRadius( )
	{
		return dOuterRadius;
	}

	/**
	 * Sets the outer radius for this arc.
	 * 
	 * @param outerRadius
	 */
	public void setOuterRadius( double outerRadius )
	{
		dOuterRadius = outerRadius;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.event.PrimitiveRenderEvent#copy()
	 */
	public PrimitiveRenderEvent copy( ) throws ChartException
	{
		ArcRenderEvent are = new ArcRenderEvent( source );
		if ( outline != null )
		{
			are.setOutline( goFactory.copyOf( outline ) );
		}

		if ( ifBackground != null )
		{
			are.setBackground( goFactory.copyOf( ifBackground ) );
		}

		if ( loTopLeft != null )
		{
			are.setTopLeft( loTopLeft.copyInstance( ) );
		}

		are.setStyle( iStyle );
		are.setWidth( dWidth );
		are.setHeight( dHeight );
		are.setStartAngle( dStartInDegrees );
		are.setEndAngle( dExtentInDegrees );
		are.setInnerRadius( dInnerRadius );
		are.setOuterRadius( dOuterRadius );

		return are;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.event.PrimitiveRenderEvent#draw(org.eclipse.birt.chart.device.IDeviceRenderer)
	 */
	public void draw( IDeviceRenderer idr ) throws ChartException
	{
		idr.drawArc( this );
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.event.PrimitiveRenderEvent#fill(org.eclipse.birt.chart.device.IDeviceRenderer)
	 */
	public void fill( IDeviceRenderer idr ) throws ChartException
	{
		idr.fillArc( this );
	}

	public LineAttributes getLineAttributes( )
	{
		return getOutline( );
	}
}
