正如我在之前的(未回答的)问题中提到的,我正在制作一个可以嵌入到我的程序中的图像编辑器。所以我想到了一个点,我决定图像编辑器必须具有撤消和重做功能。所以我写了这段代码:
public Vector<Color[][]> undo = new Vector<Color[][]>();
size = 16;
public Color[][] chroma = new Color[size][size];
//These are variables
public void saveRevision(){
System.out.println("Saving: " + current);
undo.insertElementAt(chroma.clone(), current);
current++;
/*for (int i = 0; i < (undo.size()-1); i++) {
if(i > current){
undo.remove(i);
}
}*/
}
public void undo(){
if(current > 0){
System.out.println("Gathering: " + (current-1));
current--;
/*Color[][] c = undo.get(current);
for (int i = 0; i < c.length; i++) {
for (int j = 0; j < c[i].length; j++) {
System.out.print(c[i][j]);
}
System.out.println();
}*/
/*for(int i = 0; i < size; i++){
for(int j = 0; j < size; j++){
chroma[i][j] = null;
}
}*/
chroma = undo.get(current);
repaint();
}
}
public void redo(){
if((undo.size()-1) > current){
System.out.println("Gathering: " + (current+1));
current++;
for(int i = 0; i < size; i++){
for(int j = 0; j < size; j++){
chroma[i][j] = null;
}
}
chroma = undo.get(current);
repaint();
}
}
问题是我无法从具有所有色度修订的向量中写入数组。如您所见,我尝试了所有方法,但“色度”变量似乎没有改变。Em我做错了什么?
只是忘了提一下:撤消和重做是使用 JButton 触发的,每次释放鼠标按钮时都会进行修订。