Algorithm analysis of greedy snake
(4)
James @ www.chenshen.com
Wormpit class
Worm and Wormfood include Worm and Wormfood. The greedy snake will move in the picture to find food. If it eats food it will be a long. If it encounters a border or eats yourself.
Here are several important functions:
l
Private
Void PaintPITENTENTS (Graphics G)
Redraw all the elements on the screen
/ / Update the state of greed to eat snake
MyWorm.Update (g);
// The position of the head and the position of the food will eat food
IF (myfood.isat (myworm.getx (), myformation.gety ())) {
myworm.eat ();
Score = level;
Foodeaten ;
IF (Foodeaten> (Level << 1)) {
/ * Increase the game difficulty * /
ForceRedraw = true;
Foodeaten = 0;
Level ;
IF (TonePlayer! = NULL) {
Try {
TonePlayer.SetMediatime (0);
TonePlayer.Start ();
} catch (MediaException me) {}}
} else {
IF (audioplayer! = null) {
Try {
Manager.Playtone (69, 50, 100); // Play Audio
} catch (MediaException me) {}}}
g.setColor (WormPit.Rase_COLOUR);
// Fill the rectangle (the width of three words)
G.FillRect ((width - (score_char_width * 3)) - start_pos,
HEIGHT-START_POS,
(Score_char_width * 3),
Score_char_height;
g.setcolor (WormPit.Draw_colour);
/ / Display new score
g.drawstring ("" score,
Width - (score_char_width * 3) - start_pos,
Height - start_pos, graphics.top | graphics.Left);
/ / Re-generate food
myfood.Regenerate ();
INT x = myfood.getx ();
Int y = myfood.gety ();
While (MyWorm.Contains (x, y)) {
// If the food and the body of the snake are regenerated
myfood.Regenerate ();
X = myfood.getx (); y = myfood.gety ();}}
// Draw food
myfood.paint (g);
} catch (workxception se) {gameover = true;
l public void run ()
Main cycle:
While (! gamedestroyed) {// The game is not terminated, it is looped
Try {
Synchronized (MyWorm) {// Multi-threaded synchronization
// If the game is over
IF (GameOver) {
IF (WormScore.GethighScore (Level) // Save the highest points Wormscore.sethiGHScore (Level, Score, "ME"); IF ((Audioplayer! = null) && (Audioplayer.getState () == Player.Started) { Try { AudioPlayer.stop (); Manager.Playtone (60, 400, 100); } catch (exception ex) {}}} // Rear painting Repaint (); Wait for the user to start again at the end of the game Myworm.wait (); } else if (gamepaused) { // Rear painting Repaint (); // Wait for the user to start again when the game is suspended Myworm.wait (); } else { // Game continues myworm.moveonupdate (); Repaint (); // The waiting time here determines the game difficulty !!! MyWorm.wait (Default_Wait- (Level * 40)); } } } catch (java.lang.interruptedException IE { } } About the Author: Shen Yachang, Senior Programmer, SCJP Www.chenshen.com Jinashen@benq.com August 10, 2003
