>我正在尝试使用滑块增加 2D 数组的值。我本质上想增加由 R G 和 B 数组写入的图像的亮度。我相信我的方法被正确调用并且正在侦听滑块值,但我现在担心值超过 255。我添加了模运算符来防止这种情况,但我收到一个 ArrayOutOfBoundsException,从我开始将数量添加到索引的行开始。我添加了 print 语句以查看值是否更改而它们没有更改,但是每当我移动滑块时,都会出现 ArrayOutOfBoundsException。
调整亮度 更改数组值的方法:
public void adjustBrightness(int amount) {
int gimmieRows = thePPMImage.getNumRows();
int gimmieCols = thePPMImage.getNumCols();
int[][] gimmieRed = thePPMImage.getRedPixels();
int[][] gimmieBlue = thePPMImage.getBluePixels();
int[][] gimmieGreen = thePPMImage.getGreenPixels();
int[][] brighterRedPixels =new int[gimmieRed.length][gimmieRed[0].length];
int [][] brighterGreenPixels = new int[gimmieGreen.length][gimmieGreen.length];
int [][] brighterBluePixels = new int[gimmieBlue.length][gimmieBlue[0].length];
for (int i = 0; i < gimmieRows; i++) {
for (int j = 0; j < gimmieCols; j++) {
if ((i+amount)%255>1.0 || (j+amount)%255>1.0) {
amount =amount-255;}
else ((i+amount)%255<=1.0 || (j+amount)%255<=1.0)
{amount=amount;}
System.out.println(gimmieRed[11][7]);
brighterRedPixels[i][j] = amount + gimmieRed[i][j];
brighterGreenPixels[i][j] = amount + gimmieGreen[i][j];
brighterBluePixels[i][j] = amount + gimmieBlue[i][j];
System.out.println(gimmieRed[11][7]);
System.out.println(brighterRedPixels[11][7]);
}
}
thePPMImage = new PPMImage(brighterRedPixels, brighterGreenPixels,brighterBluePixels );
thePPMImage.setRedPixels(brighterRedPixels);
thePPMImage.setGreenPixels(brighterGreenPixels);
thePPMImage.setBluePixels(brighterBluePixels);
imageLabel.setIcon(new SImage(
transposeArray(thePPMImage.getRedPixels()),
transposeArray(thePPMImage.getGreenPixels()),
transposeArray(thePPMImage.getBluePixels())));
更改滑块的侦听器。
public class event implements ChangeListener {
public void stateChanged (ChangeEvent e){
int amount = brightnessSlider.getValue();
adjustBrightness(amount);
任何见解将不胜感激,这项任务就像昨天一样到期。
我目前看到的ArrayOutOfBoundsException
的唯一原因是gimmieRed[11][7]
和brighterRedPixels[11][7]
的println。如果其中一个数组没有 12 行或 8 列,则会引发异常。
如果您添加(简化(版本的 PPMImage
& SImage
类和 transposeArray
方法,这将有所帮助。