Hello All. This program lets the user select any three points within the applet window and draw a triangle. It then prints out the perimeter of the triangle and the area of the triangle. After the user has selected three points, you should then be able to click a fourth time to clear the screen and to start a new triangle. I can not figure out how to clear the applet and start the new points of the triangle. Here is my code so far:
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Triangle extends Applet {
int[] xcoords = new int [3];
int[] ycoords = new int [3];
int pointct = 0;
public void init () {
resize (500,500);
addMouseListener (new MouseAdapter ()
{
public void mousePressed (MouseEvent e) {
xcoords[pointct] = e.getX();
ycoords[pointct] = e.getY();
pointct ++;
repaint();
}
}
);
}
public void paint (Graphics g) {
g.drawPolygon(xcoords, ycoords, pointct); //Draws Triangle
g.drawLine (xcoords[0],ycoords[0],xcoords[0],ycoords[0]); //Draws first point
double A = Math.sqrt(Math.pow((xcoords[0]-xcoords[1]),2)+Math.pow((ycoords[0]-ycoords[1]),2));
double B = Math.sqrt(Math.pow((xcoords[1]-xcoords[2]),2)+Math.pow((ycoords[1]-ycoords[2]),2));
double C = Math.sqrt(Math.pow((xcoords[2]-xcoords[0]),2)+Math.pow((ycoords[2]-ycoords[0]),2));
double perimeter = (A+B+C);
double S = (perimeter * 0.5);
double Area = (Math.sqrt(S*(S-A)*(S-B)*(S-C)));
g.drawString ("Perimeter =" + perimeter,0,400);
g.drawString ("Area =" + Area,0,425);
}
}Thank you for reading :) Any help or information would be greatly appreciated.
