# POLYGONES

## 1. DEFINITIONS

Polygones are multiple shapes and can be produced using the methods drawPolygon and fillPolygone. The arguments for either can be a two integer arrays of coordinates, xCoords[] and yCoords[], or an instance of the class Polygon. To create a Polygone object we use the constructor Polygone with two arguments representing arrays of coordinates. Example:

```int xCoords[] = {20, 40, 50, 30};
int yCoords[] = {50, 50, 60, 80};
Polygon myPolygon = new Polygone(xCoords,yCoords);
drawPolygon(myPolygone);
```

Alternatively we could have wriitem:

```int xCoords[] = {20, 40, 50, 30};
int yCoords[] = {50, 50, 60, 80};
drawPolygon(xCoords,yCoords);
```

to produce the same effect.

## 2. EXTENSIVE EXAMPLE

In this example we draw 10000 (100*100) 3-D cuboids, each of a random height, placed on a 100 by 100 grid. Each cuboid ismade up of three polgones, one for each "face".

 ```// JAVA POLYGONES // Frans Coenen // Tuesday 22 May 2003 // The University of Liverpool, UK /* Based on example given by Deitel and Deital */ import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import java.awt.image.*; // Java extension packages import javax.swing.*; public class Polygones extends JFrame { // ------------------- FIELDS ------------------------ /* CONSTANTS */ static final int INDENT = 3; static final int MAX = 100; static final int Y_BORDER = 10; static final int X_BORDER = 30; static final int WIDTH = (X_BORDER*2)+(INDENT*MAX*2); static final int HEIGHT = 30+(Y_BORDER*2)+(INDENT*MAX*3); // ------------------ CONSTRUCTORS ------------------- public Polygones() { super("Java Polygones"); getContentPane().setBackground(Color.white); setSize(WIDTH,HEIGHT); setVisible(true); } // ------------------ METHODS ------------------------ /* PAINT */ /** Draws general paths. */ public void paint(Graphics g) { // Call superclass paint method super.paint(g); int height, x2, y2; int x1 = (99*INDENT)+X_BORDER; int y1 = (102*INDENT)+Y_BORDER+30; for(int xIndex=MAX;xIndex>0;xIndex--) { x2 = x1; y2 = y1; for(int yIndex=MAX;yIndex>0;yIndex--) { height = (int) (Math.random()*100); drawTower(g,x2,y2,height*INDENT); x2 = x2-INDENT; y2 = y2+INDENT; } x1 = x1+INDENT; y1 = y1+INDENT; } } public void drawTower(Graphics g, int x, int y, int h) { drawPolygoneLeft(g,x,y,h); drawPolygoneRight(g,x,y,h); drawDiamond(g,x,y,h); } public void drawPolygoneLeft(Graphics g, int x, int y, int h) { g.setColor(new Color(102,102,102)); int xValues[] = {x,x,x+INDENT,x+INDENT}; int yValues[] = {y-INDENT,y-INDENT-h,y-h,y}; Polygon polygon1 = new Polygon(xValues,yValues,4); g.fillPolygon(polygon1); } public void drawPolygoneRight(Graphics g, int x, int y, int h) { g.setColor(new Color(153,153,153)); int xValues[] = {x+INDENT,x+INDENT,x+INDENT+INDENT,x+INDENT+INDENT}; int yValues[] = {y,y-h,y-h-INDENT,y-INDENT}; Polygon polygon1 = new Polygon(xValues,yValues,4); g.fillPolygon(polygon1); } public void drawDiamond(Graphics g, int x, int y, int h) { g.setColor(new Color(204,204,204)); int xValues[] = {x,x+INDENT,x+INDENT+INDENT,x+INDENT}; int yValues[] = {y-h-INDENT,y-h-INDENT-INDENT,y-h-INDENT,y-h}; Polygon polygon1 = new Polygon(xValues,yValues,4); g.fillPolygon(polygon1); } /* MAIN METHOD */ public static void main(String args[]) { Polygones application = new Polygones(); application.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); } } ```

Table 1: Polygone example code

Figure 1 :Output from code presented in Table 1