[nodevelop]

hi
I want to display a 300x300 px image into the canvas and then move it. I used this code, it works well, but I have a problem about the canvas size limit:

import javax.microedition.lcdui.*;
public class BigImage extends Canvas implements CommandListener {
private Image image1;
private int canvasY = getHeight();
private int canvasX = getWidth();
private int locateY = canvasY / 2;
private int locateX = canvasX / 2;
private int x = 0;
private int y = 0;
public BigImage() {
try {
image1 = Image.createImage("/BigImage.png");
}
catch (Exception e) {}
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
private void jbInit() throws Exception {
setCommandListener(this);
addCommand(new Command("Exit", Command.EXIT, 1));
}
public void commandAction(Command command, Displayable displayable) {
}
protected void paint(Graphics g) {
g.drawImage(image1,locateX + x,locateY + y,Graphics.HCENTER|Graphics.VCENTER);
}
protected void keyPressed (int keyCode) {
int action = getGameAction(keyCode);
switch (action) {
case Canvas.RIGHT:
x = x + 10;
repaint();
break;
case Canvas.LEFT:
x = x - 10;
repaint();
break;
case Canvas.UP:
y = y - 10;
repaint();
break;
case Canvas.DOWN:
y = y + 10;
repaint();
break;
}
}
}

I used the image center as the anchor point. variable x , y are used as image current position.
I don't know how to set image's corners as displayble position limit.
I mean the image must always cover all the canvas!
can you help me? code samples are welcome.
thanks

eml

[lizergil]

hi, try this code :)

import javax.microedition.lcdui.*;

public class Screen
extends Canvas
implements CommandListener {

private final int height = getHeight();
private final int width = getWidth();
private final int xOffset = 0;
private final int yOffset = 0;
private Image image;
private int maxX = 0;
private int maxY = 0;
private int x = 0;
private int y = 0;
private int speed = 5;
Command exit;


public Screen() {
try {
image = Image.createImage("/BigImage.png");
}
catch (Exception e) {}
maxX = width - image.getWidth();
maxY = height - image.getHeight();
exit = new Command("Exit", Command.EXIT, 1);
addCommand(exit);
setCommandListener(this);
}

protected void paint(Graphics g) {
int anchor = Graphics.LEFT | Graphics.TOP;
g.drawImage(image, x, y, anchor);

}

private void moveImage(int direction) {
switch (direction) {
case 1:

if (x + speed <= xOffset) {
x+=speed;
}
break;
case 2:
if (y + speed <= yOffset) {
y+=speed;
}
break;
case 3:
if (x - speed >= maxX) {
x-=speed;
}
break;
case 4:
if (y - speed >= maxY) {
y-=speed;
}
break;
}
repaint();
}

public void commandAction(Command command, Displayable displayable) {
}

protected void keyPressed(int keyCode) {
int action = getGameAction(keyCode);
switch (action) {
case Canvas.RIGHT:
moveImage(1);
break;
case Canvas.LEFT:
moveImage(3);
break;
case Canvas.UP:
moveImage(4);
break;
case Canvas.DOWN:
moveImage(2);
break;
}

}
}

[nodevelop]

thank you very much lizergil

your code is strong and works well

regards

eml