[英]Using an EventHandler to increase values of an 2D array
我正在尝试使用滑块来增加2D数组的值。 我本质上是想增加由RG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,但是现在我担心值超过255。我在模运算符中添加了为了防止这种情况,但我从将金额添加到索引的那一行开始收到ArrayOutOfBoundsException。 我添加了打印语句,以查看值是否更改,并且它们没有更改,但是每当我移动滑块时,就会出现ArrayOutOfBoundsException。
AdjustBrightness方法,用于更改数组的值:
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,此作业应于昨天完成。
我目前看到的ArrayOutOfBoundsException
的唯一原因是gimmieRed[11][7]
和brighterRedPixels[11][7]
的println。 如果这些数组之一没有12行或8列,则将引发异常。
如果添加(简化)了PPMImage
和SImage
类以及transposeArray
方法的版本,则将有所帮助。
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