Character movement according to map?

Question

hi guys
in my game there is a player(Actor) and the player is standing on a horizontally mapped tile...
my problem is i just want to move the player according to the tiles . the player is a set of frames using drawRegion i am drawing that player ..when i press right key he has to move right in a position wise manner
any pls give me a solution
***********here is my code***************
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
public class ExampleGameCanvas extends GameCanvas implements Runnable
private boolean isPlay; // Game Loop runs when isPlay is true
private long delay=8; // To give thread consistency
private int k;
private int counter=0;
private int xpos=50;
private int ypos=60;
private byte ROTATE_NONE = Sprite.TRANS_NONE;
private byte ROTATE_90 = Sprite.TRANS_ROT90;
private byte ROTATE_180= Sprite.TRANS_ROT180;
private byte ROTATE_270= Sprite.TRANS_ROT270;
private byte CURRENT_ROTATE=ROTATE_NONE;
private Image clwalk;
private Image tilesImg,bottomboard,clownIdle; //Image varibale declaration-kris
private int clwalkXstart=0;
private int clnX=0;
private int tileXPos = 0;
private int tileYPos = 150;
private byte tileWidth = 21;
private byte tileHeight = 21;
private int tileStartXPosition = 0;
private int tileStartYPosition = 0;
private int numberOfRows = 12;
private int numberOfColumns = 11;
private int tileStartY = 39;
private int sampleMap[][] = {
//1, 2, 3, 4, 5, 6, 7, 8, 9,10,11
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1}, //11x12
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
{-1,-1,-1,-1, 1,-1,-1,-1,-1,-1,-1},
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1}, //-1 for empty space
{0,0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0,0} //0 for square tile
private int current_Map[][] = new int[numberOfRows][numberOfColumns]; //this will store the current level
// Constructor and initialization
public ExampleGameCanvas()
super(true);
try
tilesImg = Image.createImage("/tiles_240x320.png");
bottomboard = Image.createImage("/bottomboard_240x320.png");
clwalk = Image.createImage("/cl_walk_240x320.png");
}catch(Exception ee){}
// Automatically start thread for game loop
public void start()
isPlay = true;
Thread t = new Thread(this);
t.start();
// Main Game Loop
public void run()
Graphics g = getGraphics();
while (isPlay == true)
input();
drawMap(g);
drawPlayer(g);
try { Thread.sleep(delay); }
catch (InterruptedException ie) {}
// Method to Handle User Inputs
private void input()
int keyStates = getKeyStates();
// Right
if ((keyStates & RIGHT_PRESSED) !=0 )
System.out.println("bbbbbbbbbbbbbbbbbbbbbbbbbbbb");
clnX=clnX+2;
else if ((keyStates & LEFT_PRESSED) !=0 )
System.out.println("1111111111111111111111111111111111");
clnX=clnX-2;
private void drawMap(Graphics g)
System.out.println("jjjjjjjjjjjjjjjjjjjjjjj");
System.out.println("oooooooooooooooooooo");
g.setClip(0, 0, getWidth(), getHeight());
g.drawImage(bottomboard, 0, getHeight()-bottomboard.getHeight(), 0);
current_Map=sampleMap;
for(byte row = 0; row < numberOfRows; row++)
for(byte col =0; col < numberOfColumns; col++)
switch(current_Map[row][col])
case 0:
g.drawRegion(tilesImg, tileStartXPosition, tileStartYPosition, tileWidth, tileHeight, ROTATE_NONE, tileXPos,220, Graphics.TOP|Graphics.LEFT);
break;
if(tileXPos < 215)
tileXPos += tileWidth;
else
tileXPos = 5;
if(row >= 11)
tileYPos = tileStartY;
else
tileYPos += tileHeight;
// repaint();
// flushGraphics();
private void drawPlayer(Graphics g)
g.setColor(0xffffff);
g.fillRect(0,0,getWidth(),155+clwalk.getHeight());
g.drawRegion(clwalk,clwalkXstart, 0, 26, 41, ROTATE_NONE, clnX,180, Graphics.TOP|Graphics.LEFT);
clwalkXstart=clwalkXstart+26;
if(clwalkXstart==390)
clwalkXstart=0;
flushGraphics();
repaint();
thanks in advance

Answer 1

So, do you want to make a walking character that is not allowed to run through walls, or do you want the character to move automatically, so that it chooses an empty space that is on the side at an arbitrary height ?
If the first thing is what you mean, then this is how I do it: before I try and move a character, I first check if the position it should move into is free. If it is, that is, if no tile is in the way, the motion is granted/allowed.
Pseudocode:
If Key(LEFT)
     If (Character can move to left) { Move character to left }
     If (Character can move to right) { Move character to right }
}As for gravity and jumping, I use this:
Pseudocode:
If (jump > 0)
    jump = jump - 1
    *Move character upwards, if allowed*
Else
    If (*Character can move downwards*)
         *Move character downwards*
    ElseIf Key(SPACE)
          jump = 150
}