//
// BarChart.java - defines BarChart class
//
// Code Developed for the Java Tutor column in Java Report 
// and Datamation Magazine
//
// Copyright (c) 1995 by Philip Meese
//

package ThirdParty.BarChart;

import java.awt.*;	// referece to the Abstract Window Toolkit pkg

import ThirdParty.BarChart.*;	// ref to our own class

public class BarChart extends Canvas {
	// member data
	NumericSet	_set;
	Rectangle 	_rect;		// our getBounds (bounding rectangle)
	int 		_margin=5;	// for t, b, l and r margins

	// member functions
	public BarChart(NumericSet set_, int width_, int height_){
		numericSet(set_);
		setBounds(0, 0, width_, height_);
	}
	public void numericSet(NumericSet set_){
		_set=set_;
		repaint();
	}
	public void paint(Graphics g_){
		_rect=getBounds();
		paintBackground(g_, Color.white);
		if(_set.length()>0)
			paintBars(g_);
	}
	public void paintBars(Graphics g_){
		int sep=2;		// interbar spacing
		Color c=g_.getColor();	// remember color for later

		// area within which the bars will be rendered
		int renderWidth=_rect.width-_margin*2-(_set.length()-1)*sep;
		int renderHeight=_rect.height-_margin*2;

		int barWidth=renderWidth/_set.length();
		
		// scaling factor so values fit in given height
		float scaleFactor=(float)renderHeight/_set.max();

		Point barOrg=new Point(_margin, _margin);
		for(int i=0; i<_set.length(); i++, barOrg.y=_margin){
			int barHeight=(int)(_set.value(i)*scaleFactor);

			// adjust bar rect so it grows from bottom
			barOrg.y=_margin+renderHeight-barHeight;

			g_.setColor(Color.black);		// outline bar
			g_.drawRect(barOrg.x, 
				    barOrg.y, 
				    barWidth-sep, 
				    barHeight);

			g_.setColor(Color.red);			// fill bar
			g_.fillRect(barOrg.x+1,
				    barOrg.y+1, 
				    barWidth-sep-1, 
				    barHeight-1);

			barOrg.x += barWidth + sep;		// space between
		}
		g_.setColor(c);	//reset color
	}
	public void paintBackground(Graphics g_, Color c_){
		Color c=g_.getColor();
		g_.setColor(c_);
		g_.fillRect(0, 0, _rect.width, _rect.height);
		g_.setColor(c);
	}

} // end class BarChart


// debugging code no longer needed
/*
		debugPrintln("_rect.x/y/w/h=" + _rect.x + " "+  _rect.y +
			 " "+  _rect.width + " "+  _rect.height);


	public void debugPrintln(String s_){
		if(_debug>0) System.out.println(s_);
	}

		debugPrintln("paintBars: barWidth=" + barWidth + 
			", _rect.height=" + _rect.height +
			", _rect.width=" + _rect.width);
		debugPrintln("        scaleFactor=" + scaleFactor +
			", _set.length()=" + _set.length() +
			",_set.max()=" + _set.max() );

 */