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|
package Textprg;
public class Brighten
{
final static int ROWS=80;
final static int COLUMNS=80;
final static int SQUARE_SIZE=5;
static int currentRow;
static int currentColumn;
public static void main(String[]args)
{
Mosaic.open(ROWS,COLUMNS,SQUARE_SIZE,SQUARE_SIZE);
currentRow=ROWS/2;
currentColumn=COLUMNS/2;
while(Mosaic.isOpen())
{
brightenSquare(currentRow,currentColumn);
randomMove();
Mosaic.delay(20);
}
}
static void brightenSquare(int row,int col)
{
int r=Mosaic.getRed(row,col);
r+=25;
Mosaic.setColor(row,col,r,0,0);
}
static void randomMove()
{
int directionNum;
directionNum=(int)(4*Math.random());
switch(directionNum)
{
case 0:
currentRow--;
if (currentRow<0)
currentRow=ROWS-1;
break;
case 1:
currentColumn++;
if (currentColumn>=COLUMNS)
currentColumn=0;
break;
case 2:
currentRow++;
if (currentRow>=ROWS)
currentRow=0;
break;
case 3:
currentColumn--;
if (currentColumn<0)
currentColumn=COLUMNS-1;
break;
}
}
}
package Textprg;
import java.awt.*;
import java.awt.event.*;
public class Mosaic
{
private static Frame window; // A mosaic window, null if no window is open.
private static MosaicCanvas canvas; // A component that actually manages and displays the rectangles
public static void open() {
// Open a mosaic window with a 20-by-20 grid of squares, where each
// square is 15 pixels on a side.
open(20,20,15,15);
}
public static void open(int rows, int columns) {
// Open a mosaic window with the specified numbers or rows and columns
// of squares, where each square is 15 pixels on a side.
open(rows,columns,15,15);
}
synchronized public static void open(int rows, int columns, int blockWidth, int blockHeight) {
// Open a window that shows a mosaic with the specified number of rows and
// columns of rectangles. blockWidth and blockHeight specify the
// desired width and height of rectangles in the grid. If a mosaic window
// is already open, it will be closed before the new window is open.
if (window != null)
window.dispose();
canvas = new MosaicCanvas(rows,columns,blockWidth,blockHeight);
window = new Frame("Mosaic Window");
window.add("Center",canvas);
window.addWindowListener(
new WindowAdapter() { // close the window when the user clicks its close box
public void windowClosing(WindowEvent evt) {
close();
}
});
window.pack();
window.show();
}
synchronized public static void close() {
// If there is a mosiac window, close it.
if (window != null) {
window.dispose();
window = null;
canvas = null;
}
}
synchronized public static boolean isOpen() {
// This method returns a boolean value that can be used to
// test whether the window is still open.
return (window != null);
}
public static void delay(int milliseconds) {
// Calling this routine causes a delay of the specified number
// of milliseconds in the program that calls the routine. It is
// provided here as a convenience.
if (milliseconds > 0) {
try { Thread.sleep(milliseconds); }
catch (InterruptedException e) { }
}
}
public static Color getColor(int row, int col) {
// Returns the object of type Color that represents the color
// of the grid in the specified row and column.
if (canvas == null)
return Color.black;
return canvas.getColor(row, col);
}
public static int getRed(int row, int col) {
// Returns the red component, in the range 0 to 255, of the
// rectangle in the specified row and column.
if (canvas == null)
return 0;
return canvas.getRed(row, col);
}
public static int getGreen(int row, int col) {
// Returns the green component, in the range 0 to 255, of the
// rectangle in the specified row and column.
if (canvas == null)
return 0;
return canvas.getGreen(row, col);
}
public static int getBlue(int row, int col) {
// Returns the blue component, in the range 0 to 255, of the
// rectangle in the specified row and column.
if (canvas == null)
return 0;
return canvas.getBlue(row, col);
}
public static void setColor(int row, int col, Color c) {
// Set the rectangle in the specified row and column to have
// the specified color.
if (canvas == null)
return;
canvas.setColor(row,col,c);
}
public static void setColor(int row, int col, int red, int green, int blue) {
// Set the rectangle in the specified row and column to have
// the color with the specifed red, green, and blue components.
if (canvas == null)
return;
canvas.setColor(row,col,red,green,blue);
}
public static void fill(Color c) {
// Set all the rectangels in the grid to the color c.
if (canvas == null)
return;
canvas.fill(c);
}
public static void fill(int red, int green, int blue) {
// Set all the rectangles in the grid to the color with
// the specified red, green, and blue components.
if (canvas == null)
return;
canvas.fill(red,green,blue);
}
public static void fillRandomly() {
// Sets each rectangle in the grid to a different randomly
// chosen color.
if (canvas == null)
return;
canvas.fillRandomly();
}
} // end of class Mosaic |
The method add
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