J2ME Sprite frames
题
I am trying to paint only one part of Image. The image human is 159x22 length.
In that image there is 8 human bodies (2 left, 2 right and etc.). If i try to set the Frame to humanSprite.setFrame(1);
I will get an error since I specified in the Sprite constructor the size of an Image so there is only one frame.
Well I have tried to divide it by 8 and Ill get
java.lang.IllegalArgumentException`.
Here is the class :
package org.pack.rhynn;
import java.io.IOException;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.Sprite;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import java.util.Random;
public class play extends GameCanvas implements Runnable{
int sleep = 30;
private Image map;
private Sprite mapSprite;
private Image human;
private Sprite humanSprite;
private int humanX = getWidth() /2;
private int humanY = getHeight() /2;
public play(){
super(false);
}
public void start(){
try {
map = Image.createImage("/mapas.png");
human = Image.createImage("/human.PNG");
} catch (IOException ioex) {
System.out.println(ioex);
}
mapSprite = new Sprite(map);
mapSprite.defineReferencePixel(100, 150);
mapSprite.setRefPixelPosition(0, 0);
humanSprite = new Sprite(human,159,22);
humanSprite.defineReferencePixel(1, 10);
humanSprite.setRefPixelPosition(humanX, humanY);
Thread thr = new Thread(this);
thr.start();
}
public void run(){
while(true){
updateScreen(getGraphics());
try{
Thread.sleep(sleep);
}catch(Exception e){}
}
}
private void createBackground(Graphics g){
g.setColor(0x000000);
g.fillRect(0, 0, getWidth(), getHeight());
}
private void updateScreen(Graphics g){
createBackground(g);
mapSprite.setRefPixelPosition(0, 0);
mapSprite.paint(g);
humanSprite.setRefPixelPosition(humanX, humanY);
humanSprite.setFrame(0);
humanSprite.setPosition(50,50);
humanSprite.paint(g);
flushGraphics();
}
}
解决方案
The problem seems to be with your image. All frames must have the same width and height and the image final width and hight must be a multiple of them.
For example, let's say all your frames are in a single row. If the frame width is 19 and you have 8 frames, the final image width must be 152.
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