/*
  ExampleLetter

  @author Warren Sack
  @version February 2003

**/

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;

public class ExampleLetter extends ApplicationFrame implements MouseListener, MouseMotionListener {
    
    double horizX1;
    double horizX2;
    double horizY;
    double leftX;
    double middleX;
    double rightX;
    double upperY;
    double lowerY;

    public static void main (String[] args) {
	new ExampleLetter(Double.parseDouble(args[0]), 
			  Double.parseDouble(args[1]),
			  Double.parseDouble(args[2]), 
			  Double.parseDouble(args[3]));
    }


    private ExampleLetter (double leftX, double upperY, double width, double height) {
	super("ExampleLetter");
	setSize(600,300);
	center();
	this.leftX = leftX;
	this.upperY = upperY;
	theLetterA(width, height);
	addMouseListener(this);
	addMouseMotionListener(this);
	setVisible(true);
    }

    

    //
    // SLOPE
    //
    // Calculate the slope of a line that runs through
    // the two points specified by (X1,Y1) & (X2,Y2).
    //
    private double slope (double x1, double y1, double x2, double y2) {

	double finalResult = 999999;
	if ( x1 != x2 ) {
	    finalResult = ( (y1-y2) / (x1-x2) );
	}
	return(finalResult);
    }


    //
    // YINTERCEPT
    //
    // 
    // Given a point on a line (X,Y) and the Slope of the
    // line, calculate where the line intersects the Y axis.
    //
    private double  yIntercept (double x, double y, double slope)  {
	return(y-(slope*x));
    }


    //
    // XINTERSECTION
    //
    // Given the equations for two lines (parameterized as
    // their respective YIntercepts and Slopes) calculate
    // the X position of their intersection.
    //
    private double xIntersection (double slope1, double yIntercept1, double slope2, double yIntercept2) {
	
	double finalResult = 999999;
	if ( slope1 != slope2 ) {
	    finalResult = ((yIntercept2-yIntercept1)/(slope1-slope2));
	}
	return(finalResult);
    }

    //
    // SQUIRT	
    //
    // Approximate a square root function.
    //
    private double squirt (double in) {
	return(java.lang.Math.sqrt(in));
    }

    

    //
    // THELETTERA
    //
    // Draw a letter A to the screen given an upper lefthand position
    // (LeftX,UpperY) and a Width and Height for the letter
    //
    private void theLetterA (double width, double height) {

	// calculate the outside top and bottom points of the A
	rightX = leftX + width;
	lowerY = upperY - height;
	middleX = leftX + ( width / 2.0);

	// set the horizontal bar of the A at 2/3 of the way down
	// from the top of the letter
	horizY = upperY - ( 2.0 * ( height / 3.0 ) );

	// calculate the slope and y intercept of the line that
	// constitutes the lefthand side of the A
	double leftA = slope(leftX,lowerY,middleX,upperY);
	double leftB = yIntercept(leftX,lowerY,leftA);

	// do the same for the righthand side of the A
	double rightA = slope(middleX,upperY,rightX,lowerY);
	double rightB = yIntercept(middleX,upperY,rightA);

	// set the slope to 0 and the y intercept to HorizY
	// for the horizontal bar of the A
	double horizA = 0.0;
	double horizB = horizY;
	
	// calculate where the horizontal bar intersects with
	// the lefthand and the righthand sides of the A
	horizX1 = xIntersection(horizA,horizB,leftA,leftB);
	horizX2 = xIntersection(horizA,horizB,rightA,rightB);
}



    public void paint (Graphics g) {
	
	Graphics2D g2 = (Graphics2D)g;
	//	System.out.println("painting again!");

	// Draw the lines
	g2.setPaint(Color.black);
	g2.drawLine((int)horizX1,(int)horizY,(int)horizX2,(int)horizY);
	g2.drawLine((int)leftX,(int)lowerY,(int)middleX,(int)upperY);
	g2.drawLine((int)middleX,(int)upperY,(int)rightX,(int)lowerY);
	g2.setPaint(Color.black);
	g2.drawLine(20,-40,50,20);
	// These print statements are here for debugging purposes and can be removed.
	System.out.println("(" + (int)horizX1 + "," + (int)horizY + ") (" + (int)horizX2 + "," + (int)horizY + ")");
	System.out.println("(" + (int)leftX + "," + (int)lowerY + ") (" + (int)middleX + "," + (int)upperY + ")");
	System.out.println("(" + (int)middleX + "," + (int)upperY + ") (" + (int)rightX + "," + (int)lowerY + ")");
    }


    public void mouseClicked (MouseEvent me) {
    }


    public void mousePressed (MouseEvent me) {
    }


    public void mouseReleased (MouseEvent me) {
    }


    public void mouseMoved (MouseEvent me) {
    }


    public void mouseDragged (MouseEvent me) {
    }


    public void mouseEntered (MouseEvent me) {
    }


    public void mouseExited (MouseEvent me) {
    }
}