/*******************************************************************************
 * Copyright (c) 2014, 2015 MINRES Technologies GmbH and others.
 * 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:
 *     MINRES Technologies GmbH - initial API and implementation
 *******************************************************************************/
package com.minres.scviewer.ui.swt;

import java.util.Map.Entry;

import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;

class TrackPainter implements IPainter {
	
	/**
	 * 
	 */
	private final WaveformCanvas waveCanvas;

	/**
	 * @param txDisplay
	 */
	TrackPainter(WaveformCanvas waveCanvas) {
		this.waveCanvas = waveCanvas;
	}

	public void paintArea(GC gc, Rectangle area) {			
			if(this.waveCanvas.streams.size()>0){
				Integer firstKey=this.waveCanvas.trackVerticalOffset.floorKey(area.y);
				if(firstKey==null) firstKey=this.waveCanvas.trackVerticalOffset.firstKey();
				Integer lastKey = this.waveCanvas.trackVerticalOffset.floorKey(area.y+area.height);
				Rectangle subArea = new Rectangle(area.x, 0, area.width, 0);
				if(lastKey==firstKey){
					subArea.y=firstKey;
					IWaveformPainter p = this.waveCanvas.trackVerticalOffset.get(firstKey);
					subArea.height=p.getMinHeight();
					p.paintArea(gc, subArea);
				}else{
					for(Entry<Integer, IWaveformPainter> entry : this.waveCanvas.trackVerticalOffset.subMap(firstKey, true, lastKey, true).entrySet()){
						subArea.y=entry.getKey();
						subArea.height=entry.getValue().getMinHeight();
						entry.getValue().paintArea(gc, subArea);
					}
				}
			}
	}
}