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BURKS 2
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JAVA
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maze.jav
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1996-12-20
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/*********************************************************************************
Creates a random maze, then solves it by finding a path from the
upper left corner to the lower right corner. (After doing
one maze, it waits a while then starts over by creating a
new random maze.)
This applet is cutomizable using the following parameters in
its <applet> tag:
name default value meaning
------ --------------- --------------------------------------
rows 21 number of rows in maze (must be odd)
columns 21 number of columns in maze (must be odd)
border 0 width of colored border around maze
(extra space after making equal-sized
rows and columns is also part of the border)
sleepTime 5000 pause, in milliseconds between
solving one maze and creating
another
speed 3 integer between 1 and 5 specifying
how fast the a maze is created
and solved. (1 is fastest.)
wallColor black
emptyColor 128 128 255
pathColor 200 0 0
visitedColor same as empty
borderColor white
Parameter names are case sensative. Parameters that specify
colors can be given by one of the predefined color names
(black, white, red, blue, green, cyan, magenta, yellow, pink
orange, gray, lightGray, darkGray) or as an RGB color specified
by three integers between 0 and 255. Color names are NOT
case sensative.
BY: David Eck
Department of Mathematics and Computer Science
Hobart and William Smith Colleges
Geneva, NY 14456
E-mail: eck@hws.edu
NOTE: YOU CAN DO ANYTHING YOU WANT WITH THIS CODE AND APPLET, EXCEPT
CLAIM CREDIT FOR THEM (such as by trying to copyright the code
your self).
**************************************************************************/
import java.awt.*;
public class Maze extends java.applet.Applet implements Runnable {
int[][] maze; // Description of state of maze. The value of maze[i][j]
// is one of the constants wallCode, pathcode, emptyCode,
// or visitedCode. (Value can also be negative, temporarily,
// inside createMaze().)
// A maze is made up of walls and corridors. maze[i][j]
// is either part of a wall or part of a corridor. A cell
// cell that is part of a cooridor is represented by pathCode
// if it is part of the current path through the maze, by
// visitedCode if it has already been explored without finding
// a solution, and by emptyCode if it has not yet been explored.
final static int backgroundCode = 0;
final static int wallCode = 1;
final static int pathCode = 2;
final static int emptyCode = 3;
final static int visitedCode = 4;
// the next six items are set up in init(), and can be specified
// using applet parameters
Color[] color = new Color[5]; // colors associated with the preceding 5 constants;
int rows = 21; // number of rows of cells in maze, including a wall around edges
int columns = 21; // number of columns of cells in maze, including a wall around edges
int border = 0; // minimum number of pixels between maze and edge of applet
int sleepTime = 5000; // wait time after solving one maze before making another
int speedSleep = 50; // short delay between steps in making and solving maze
Thread mazeThread; // thread for creating and solving maze
Graphics me = null; // graphics context for applet; created in checkSize()
int width = -1; // width of applet, to be set by checkSize()
int height = -1; // height of applet, to be set by checkSize()
int totalWidth; // width of applet, minus border area (set in checkSize())
int totalHeight; // height of applet, minus border area (set in checkSize())
int left; // left edge of maze, allowing for border (set in checkSize())
int top; // top edge of maze, allowing for border (set in checkSize())
boolean mazeExists = false; // set to true when maze[][] is valid; used in
// redrawMaze(); set to true in createMaze(), and
// reset to false in run()
Integer getIntParam(String paramName) {
// Utility routine for reading an applet param which is an integer.
// Returns null if there is no such param, or if the value is not
// a legal integer.
String param = getParameter(paramName);
if (param == null)
return null;
int i;
try {
i = Integer.parseInt(param);
}
catch (NumberFormatException e) {
return null;
}
return new Integer(i);
}
Color getColorParam(String paramName) {
// Utility routine for reading an applet param which is a color.
// Returns null if there is no such param, or if the value is not
// a legal color. Colors can be specified as three integers,
// separated by spaces, giving RGB components in the range 0 to 255;
// the standard Java color names are also acceptable.
String param = getParameter(paramName);
if (param == null || param.length() == 0)
return null;
if (Character.isDigit(param.charAt(0))) { // try to parse RGB color
int r=0,g=0,b=0;
int pos=0;
int d=0;
int len=param.length();
while (pos < len && Character.isDigit(param.charAt(pos)) && r < 255) {
d = Character.digit(param.charAt(pos),10);
r = 10*r + d;
pos++;
}
if (r > 255)
return null;
while (pos < len && !Character.isDigit(param.charAt(pos)))
pos++;
if (pos >= len)
return null;
while (pos < len && Character.isDigit(param.charAt(pos)) && g < 255) {
d = Character.digit(param.charAt(pos),10);
g = 10*g + d;
pos++;
}
if (g > 255)
return null;
while (pos < len && !Character.isDigit(param.charAt(pos)))
pos++;
if (pos >= len)
return null;
while (pos < len && Character.isDigit(param.charAt(pos)) && b < 255) {
d = Character.digit(param.charAt(pos),10);
b = 10*b + d;
pos++;
}
if (b > 255)
return null;
return new Color(r,g,b);
}
if (param.equalsIgnoreCase("black"))
return Color.black;
if (param.equalsIgnoreCase("white"))
return Color.white;
if (param.equalsIgnoreCase("red"))
return Color.red;
if (param.equalsIgnoreCase("green"))
return Color.green;
if (param.equalsIgnoreCase("blue"))
return Color.blue;
if (param.equalsIgnoreCase("yellow"))
return Color.yellow;
if (param.equalsIgnoreCase("cyan"))
return Color.cyan;
if (param.equalsIgnoreCase("magenta"))
return Color.magenta;
if (param.equalsIgnoreCase("pink"))
return Color.pink;
if (param.equalsIgnoreCase("orange"))
return Color.orange;
if (param.equalsIgnoreCase("gray"))
return Color.gray;
if (param.equalsIgnoreCase("darkgray"))
return Color.darkGray;
if (param.equalsIgnoreCase("lightgray"))
return Color.lightGray;
return null; // param is not a legal color
}