/*-------------------------------------------------------------------*
 * NTU Student: Java With Engineering Applications, Spring 1999
 * Assignment # 4 - Java How To Program 2nd edition, Deitel & Deitel
 * Problem 9.35 on page 515 - CLASS Pie applet created to practice
 * drawing arcs and filling them in in order to build a Pie Chart.
 *
 * Michael Kusmierz
 * Xerox Corporation
 * Rev 1.0	May 8, 1999 
 *
 * This code represents a students work in progress 
 * and is not to be used beyond that purpose.
 *-------------------------------------------------------------------*/ 

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
/**
 * This type was created in VisualAge.
 */
public class Pie extends Applet implements ActionListener {
	private TextField ivjTextField1 = null;
	private TextField ivjTextField2 = null;
	private TextField ivjTextField3 = null;
	private TextField ivjTextField4 = null;
	private Label ivjLabel1 = null;
	private Label ivjLabel2 = null;
	
	//--- instance variables for four user inputs to be graphed (positive)
	long lngInput1;
	long lngInput2;
	long lngInput3;
	long lngInput4;
	
	//--- total of all inputs (must be positive)
	private float fltTotal;

	//--- define the location and size of the chart
	private final int CHART_CENTER_X = 150;
	private final int CHART_CENTER_Y = 50;
	private final int CHART_WIDTH = 100;
	private final int CHART_HEIGHT = 100;
/**
 * This method was created in VisualAge.
 * @param e ActionEvent
 */
public void actionPerformed(ActionEvent e) {
	getInput();
	repaint();
}
/*******************************************************************************
 * This actually draws a quad pie chart at the given location and given radius
 */
private void drawPieChart(Graphics g, int x, int y, int arcWidth, int arcHeight) {
	Color c;
	int startAngle,arcAngle;

	float fltNumberEntered = 0;

	//--- draw a circle
	c = Color.black;
	g.setColor( c );
	arcAngle = 360;
	startAngle=0;
	g.drawArc(x-1,y-1,arcWidth+1,arcHeight+1,startAngle,arcAngle);
	
	if (fltTotal > 0) { // Prevent devide by zero

		//--- draw the 4 arcs that make up 360 degrees
		c = Color.blue;
		g.setColor( c );
		fltNumberEntered = (float) lngInput1;
		arcAngle = (int) (360 * (fltNumberEntered / fltTotal));
		startAngle=0;
		g.fillArc(x,y,arcWidth,arcHeight,startAngle,arcAngle);
		
		c = Color.red;
		g.setColor( c );
		startAngle = startAngle+ arcAngle;
		fltNumberEntered = (float)lngInput2;
		arcAngle = (int) (360 * (fltNumberEntered / fltTotal));
		g.fillArc(x,y,arcWidth,arcHeight,startAngle,arcAngle);

		c = Color.green;
		g.setColor( c );		
		startAngle = startAngle + arcAngle;
		fltNumberEntered = (float)lngInput3;
		arcAngle = (int) (360 * (fltNumberEntered / fltTotal));
		g.fillArc(x,y,arcWidth,arcHeight,startAngle,arcAngle);
		
		//--- the last arc must fill the remainder of the circle
		c = Color.cyan;
		g.setColor( c );		
		startAngle = startAngle + arcAngle;		
		arcAngle = 360 - startAngle;
		g.fillArc(x,y,arcWidth,arcHeight,startAngle,arcAngle);
	}

}
/**
 * Gets the applet information.
 * @return java.lang.String
 */
public String getAppletInfo() {
	return "Pie created using VisualAge for Java.";
}
/*******************************************************************************
 * This method validates that text entries are valid numbers and positive
 */
private void getInput() {
	int intCnt = 0;
	try {
		showStatus("<ENTER> AN INTEGER NUMBER. Use TAB to move to the next box.");
		intCnt++;
		lngInput1 = Math.abs(Long.parseLong(ivjTextField1.getText()));
		intCnt++;
		lngInput2 = Math.abs(Long.parseLong(ivjTextField2.getText()));
		intCnt++;
		lngInput3 = Math.abs(Long.parseLong(ivjTextField3.getText()));
		intCnt++;
		lngInput4 = Math.abs(Long.parseLong(ivjTextField4.getText()));

		fltTotal = (float) (lngInput1 + lngInput2 + lngInput3 + lngInput4);
		
	} catch (Throwable exception) {
 		showStatus("INVALID ENTRY NUMBER " + intCnt);
	}
}
/**
 * Return the Label1 property value.
 * @return java.awt.Label
 */
/* WARNING: THIS METHOD WILL BE REGENERATED. */
private Label getLabel1() {
	if (ivjLabel1 == null) {
		try {
			ivjLabel1 = new java.awt.Label();
			ivjLabel1.setName("Label1");
			ivjLabel1.setText("<ENTER> any four numbers and see the pie chart fill using method fillArc ");
			ivjLabel1.setBounds(6, 167, 411, 18);
			// user code begin {1}
			// user code end
		} catch (java.lang.Throwable ivjExc) {
			// user code begin {2}
			// user code end
			handleException(ivjExc);
		}
	};
	return ivjLabel1;
}
/**
 * Return the Label2 property value.
 * @return java.awt.Label
 */
/* WARNING: THIS METHOD WILL BE REGENERATED. */
private Label getLabel2() {
	if (ivjLabel2 == null) {
		try {
			ivjLabel2 = new java.awt.Label();
			ivjLabel2.setName("Label2");
			ivjLabel2.setFont(new java.awt.Font("dialog", 1, 12));
			ivjLabel2.setText("Class Pie - p515 problem 9.35 in Deitel & Deitel ");
			ivjLabel2.setBounds(20, 12, 389, 23);
			// user code begin {1}
			// user code end
		} catch (java.lang.Throwable ivjExc) {
			// user code begin {2}
			// user code end
			handleException(ivjExc);
		}
	};
	return ivjLabel2;
}
/**
 * Return the TextField1 property value.
 * @return java.awt.TextField
 */
/* WARNING: THIS METHOD WILL BE REGENERATED. */
private TextField getTextField1() {
	if (ivjTextField1 == null) {
		try {
			ivjTextField1 = new java.awt.TextField();
			ivjTextField1.setName("TextField1");
			ivjTextField1.setFont(new java.awt.Font("dialog", 1, 12));
			ivjTextField1.setBounds(53, 192, 40, 23);
			ivjTextField1.setForeground(java.awt.Color.blue);
			// user code begin {1}
			// user code end
		} catch (java.lang.Throwable ivjExc) {
			// user code begin {2}
			// user code end
			handleException(ivjExc);
		}
	};
	return ivjTextField1;
}
/**
 * Return the TextField2 property value.
 * @return java.awt.TextField
 */
/* WARNING: THIS METHOD WILL BE REGENERATED. */
private TextField getTextField2() {
	if (ivjTextField2 == null) {
		try {
			ivjTextField2 = new java.awt.TextField();
			ivjTextField2.setName("TextField2");
			ivjTextField2.setFont(new java.awt.Font("dialog", 1, 12));
			ivjTextField2.setBounds(146, 192, 40, 23);
			ivjTextField2.setForeground(java.awt.Color.red);
			// user code begin {1}
			// user code end
		} catch (java.lang.Throwable ivjExc) {
			// user code begin {2}
			// user code end
			handleException(ivjExc);
		}
	};
	return ivjTextField2;
}
/**
 * Return the TextField3 property value.
 * @return java.awt.TextField
 */
/* WARNING: THIS METHOD WILL BE REGENERATED. */
private TextField getTextField3() {
	if (ivjTextField3 == null) {
		try {
			ivjTextField3 = new java.awt.TextField();
			ivjTextField3.setName("TextField3");
			ivjTextField3.setFont(new java.awt.Font("dialog", 1, 12));
			ivjTextField3.setBounds(239, 192, 40, 23);
			ivjTextField3.setForeground(java.awt.Color.green);
			// user code begin {1}
			// user code end
		} catch (java.lang.Throwable ivjExc) {
			// user code begin {2}
			// user code end
			handleException(ivjExc);
		}
	};
	return ivjTextField3;
}
/**
 * Return the TextField4 property value.
 * @return java.awt.TextField
 */
/* WARNING: THIS METHOD WILL BE REGENERATED. */
private TextField getTextField4() {
	if (ivjTextField4 == null) {
		try {
			ivjTextField4 = new java.awt.TextField();
			ivjTextField4.setName("TextField4");
			ivjTextField4.setFont(new java.awt.Font("dialog", 1, 12));
			ivjTextField4.setBounds(332, 192, 40, 23);
			ivjTextField4.setForeground(java.awt.Color.cyan);
			// user code begin {1}
			// user code end
		} catch (java.lang.Throwable ivjExc) {
			// user code begin {2}
			// user code end
			handleException(ivjExc);
		}
	};
	return ivjTextField4;
}
/**
 * Called whenever the part throws an exception.
 * @param exception java.lang.Throwable
 */
private void handleException(Throwable exception) {

	/* Uncomment the following lines to print uncaught exceptions to stdout */
	// System.out.println("--------- UNCAUGHT EXCEPTION ---------");
	// exception.printStackTrace(System.out);
}
/*******************************************************************************
 * Handle the Applet init method.
 */
/* WARNING: THIS METHOD WILL BE REGENERATED. */
public void init() {
	super.init();
	try {
		setName("Pie");
		setLayout(null);
		setSize(426, 240);
		add(getTextField1(), getTextField1().getName());
		add(getTextField2(), getTextField2().getName());
		add(getTextField3(), getTextField3().getName());
		add(getTextField4(), getTextField4().getName());
		add(getLabel1(), getLabel1().getName());
		add(getLabel2(), getLabel2().getName());
		// user code begin {1}

		//--- accept entry from any text field
		ivjTextField1.addActionListener(this);
		ivjTextField2.addActionListener(this);
		ivjTextField3.addActionListener(this);
		ivjTextField4.addActionListener(this);

		//--- initialize entry fields
		ivjTextField1.setText("1");
		ivjTextField2.setText("2");
		ivjTextField3.setText("3");
		ivjTextField4.setText("4");
	
		// user code end
	} catch (java.lang.Throwable ivjExc) {
		// user code begin {2}
		// user code end
		handleException(ivjExc);
	}
}
/**
 * main entrypoint - starts the part when it is run as an application
 * @param args java.lang.String[]
 */
public static void main(java.lang.String[] args) {
	try {
		Frame frame;
		try {
			Class aFrameClass = Class.forName("com.ibm.uvm.abt.edit.TestFrame");
			frame = (Frame)aFrameClass.newInstance();
		} catch (java.lang.Throwable ivjExc) {
			frame = new Frame();
		}
		Pie aPie;
		Class iiCls = Class.forName("Pie");
		ClassLoader iiClsLoader = iiCls.getClassLoader();
		aPie = (Pie)java.beans.Beans.instantiate(iiClsLoader,"Pie");
		frame.add("Center", aPie);
		frame.setSize(aPie.getSize());
		frame.setVisible(true);
	} catch (Throwable exception) {
		System.err.println("Exception occurred in main() of java.applet.Applet");
		exception.printStackTrace(System.out);
	}
}
/*******************************************************************************
 * Paint is used to test the draw PieChart method
 */
public void paint(Graphics g) {
	drawPieChart( g, CHART_CENTER_X, CHART_CENTER_Y, CHART_WIDTH, CHART_HEIGHT );
		
}
}