using the code below design: - getPerimeter() for Poligono(polygon) class - getArea() for Triangulo(triangle) class - displayStringInside()

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Question:

using the code below design:

- getPerimeter() for Poligono(polygon) class

- getArea() for Triangulo(triangle) class

- displayStringInside() for Triangulo(triangle) class will print a string inside the triangle

- getArea() for Rectangulo(rectangle) class

-displayStringInside() for Rectangulo(rectangle) class will print a string inside the rectangle

- Demostrate that the new methods created work.

Questions:

1-explain how Cuadrado(square) constructor works. how it assign the coordinates for the vertex correctly since it only receives arguments for the coordinates of top left and weight of the square?

import javax.swing.JFrame; import javax.swing.JComponent; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Line2D; public class Herencia { public static void main (String args[]) { JFrame marco = new JFrame(); marco.setSize(640, 480); marco.setTitle("Primitivos Grficos"); marco.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); marco.setVisible(true); GraphicComponent grafico = new GraphicComponent(); marco.add(grafico); } } class GraphicComponent extends JComponent { public void paintComponent(Graphics g) { Poligono miPoligono = new Poligono(5, 40, 25); miPoligono.setCoordForOneVertex(0,20,40); miPoligono.setCoordForOneVertex(1,60,40); miPoligono.setCoordForOneVertex(2,60,10); miPoligono.setCoordForOneVertex(3,20,10); miPoligono.setCoordForOneVertex(4,30,30); miPoligono.moveDown(100); miPoligono.draw(g); Triangulo triangle1 = new Triangulo(10,10,30,50,40,20,25,30); triangle1.draw(g); Rectangulo rectangle1= new Rectangulo(80,60,140,80); rectangle1.draw(g); g.setColor(Color.BLUE); rectangle1.grow(2); rectangle1.draw(g); g.drawString("Ejemplo de cmo dibujar un string", 10, 160); } } class Poligono { double x[], //contains x coordinate for vertices y[], //contains y coordinate for vertices xc, //(xc,yc) = figure's center or yc; //reference point int totalPoints; //number of vertices //Given method: Explain function Poligono() { } Poligono(int totalPoints, double xc, double yc) { this.totalPoints = totalPoints; x = new double[totalPoints]; y = new double[totalPoints]; this.xc = xc; this.yc = yc; } void setCenterCoords(double xc, double yc) { this.xc = xc; this.yc = yc; } void setCoordForOneVertex(int index, double x, double y) { if ((index < totalPoints)&& (index >= 0)) { this.x[index] = x; this.y[index] = y; } } void grow(double factor) { int i; for (i = 0; i < totalPoints; i++) { x[i] = (x[i] - xc) * factor + xc; y[i] = (y[i] - yc) * factor + yc; } } //New method: TO DO double getPerimeter() { double perimeter = 0; { //requires the code to calculate the perimeter } return (perimeter); } void moveDown(double displacement) { for (int i = 0; i < totalPoints; i++) { y[i] = y[i] + displacement; } yc = yc + displacement; } void draw(Graphics g) { Graphics2D g2 = (Graphics2D) g; int i; Line2D.Double linea = new Line2D.Double(150, 200, 200, 240); for (i = 0; i < totalPoints - 1; i++) { linea = new Line2D.Double(x[i], y[i], x[i+1], y[i+1]); g2.draw(linea); } linea = new Line2D.Double(x[0], y[0], x[totalPoints - 1], y[totalPoints - 1]); g2.draw(linea); } } class Triangulo extends Poligono { Triangulo(double x1, double y1, double x2, double y2, double x3, double y3, double xc, double yc) { super(3,xc,yc); setCoordForOneVertex(0, x1, y1); setCoordForOneVertex(1, x2, y2); setCoordForOneVertex(2, x3, y3); } //New method: TO DO double getArea() { double area = 0.0; { //requires code to calculate area } return (area); } //New method: TO DO void displayStringInside(String theString) { //requires code to display theString centralized //within the figure } } class Rectangulo extends Poligono { //New: Given constructor Rectangulo () { super(4,0.0,0.0); } Rectangulo (double x1, double y1, double x2, double y2) { super(4,0.0,0.0); double midX, midY; midX = (x1 + x2)/2.0; midY = (y1 + y2)/2.0; setCenterCoords(midX,midY); setCoordForOneVertex(0, x1, y1); setCoordForOneVertex(1, x2, y1); setCoordForOneVertex(2, x2, y2); setCoordForOneVertex(3, x1, y2); } //New method: TO DO double getArea() { double area = 0.0; { //requires code to calculate area } return (area); } //New method: TO DO void displayStringInside(String theString) { //requires code to display theString centralized //within the figure } } //*** New class: Given and to be Explained class Cuadrado extends Rectangulo { Cuadrado (double x1, double y1, double width) { super(x1,y1,x1+width,y1+width); } }