我正在尝试使用 Jpanel 和 Jform 加载图片并对其执行一些操作，到目前为止图片加载，但是当我单击执行操作时，它什么也没做。事实上，它会通过点击事件，但我猜这个问题是，repaint() 可能在那里无法正常工作。这是代码：
public class SeamCarving
{
static SeamCarving frame=new SeamCarving();
public SeamCarving() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage input;
BufferedImage[] toPaint;
public TestPane() {
try {
input = ImageIO.read(new File("C:\\Users\\SONY\\Desktop\\my-pic\\Fatima.jpg"));
toPaint = new BufferedImage[]{input};
toPaint = new BufferedImage[1];
} catch (IOException ex) {
ex.printStackTrace();
}
setLayout(new GridBagLayout());
JButton loadButton = new JButton("Load");
loadButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
BufferedImage out = input;
out = input;
toPaint[0] = out;
repaint();
System.out.println("Do Something Clicked");
}
});
add(loadButton);
JButton startButton = new JButton("Start");
add(startButton);
startButton.addActionListener(new ActionListener() {
BufferedImage out = input;
@Override
public void actionPerformed(ActionEvent ae) {
out = deleteVerticalSeam(out);
System.out.println("Do Something Clicked");
toPaint[0]=out;
repaint();
}
});
}
我想要的是这一行： out = deleteVerticalSeam(out);
但它根本不影响照片。 编辑 如果像下面这样做，它将起作用。但我想要按钮和面板
public class SeamCarving
{
public static void main(String[] args) throws IOException {
final BufferedImage input = ImageIO.read(new File(args[0]));
final BufferedImage[] toPaint = new BufferedImage[]{input};
final Frame frame = new Frame("Seams") {
@Override
public void update(Graphics g) {
final BufferedImage im = toPaint[0];
if (im != null) {
g.clearRect(0,0,getWidth(), getHeight());
g.drawImage(im,0,0,this);
}
}
};
frame.setSize(input.getWidth(), input.getHeight());
frame.setVisible(true);
BufferedImage out = input;
for(int i = 0; i < 200; i++) {
out = deleteVerticalSeam(out);
toPaint[0]=out;
frame.repaint();
}
}
和deleteVerticalSeam
private static BufferedImage deleteVerticalSeam(BufferedImage input) {
return deleteVerticalSeam(input, findVerticalSeam(input));
}
private static BufferedImage deleteVerticalSeam(final BufferedImage input, final int[] seam) {
int w = input.getWidth(), h = input.getHeight();
final BufferedImage out = new BufferedImage(w-1,h, BufferedImage.TYPE_INT_ARGB);
for(int y = 0; y < h; y++) {
for(int x = 0; x < seam[y]; x++) {
out.setRGB(x,y,input.getRGB(x, y));
}
for(int x = seam[y]+1; x < w; x++) {
out.setRGB(x-1,y,input.getRGB(x, y));
}
}
return out;
}
private static int[] findVerticalSeam(BufferedImage input) {
final int w = input.getWidth(), h = input.getHeight();
final FloatImage intensities = FloatImage.fromBufferedImage(input);
final FloatImage energy = computeEnergy(intensities);
final FloatImage minima = FloatImage.createSameSize(energy);
//First row is equal to the energy
for(int x = 0; x < w; x++) {
minima.set(x,0, energy.get(x,0));
}
//I assume that the rightmost pixel column in the energy image is garbage
for(int y = 1; y < h; y++) {
minima.set(0,y, energy.get(0,y) + min(minima.get(0, y - 1),
minima.get(1, y - 1)));
for(int x = 1; x < w-2; x++) {
final float sum = energy.get(x,y) + min(min(minima.get(x - 1, y - 1),
minima.get(x, y - 1)),minima.get(x + 1, y - 1));
minima.set(x,y, sum);
}
minima.set(w-2,y, energy.get(w-2,y) + min(minima.get(w-2, y - 1),minima.get(w-3, y - 1)));
}
//We find the minimum seam
float minSum = Float.MAX_VALUE;
int seamTip = -1;
for(int x = 1; x < w-1; x++) {
final float v = minima.get(x, h-1);
if(v < minSum) {
minSum=v;
seamTip=x;
}
}
//Backtrace the seam
final int[] seam = new int[h];
seam[h-1]=seamTip;
for(int x = seamTip, y = h-1; y > 0; y--) {
float left = x>0?minima.get(x-1, y-1):Float.MAX_VALUE;
float up = minima.get(x, y-1);
float right = x+1<w?minima.get(x+1, y-1):Float.MAX_VALUE;
if(left < up && left < right) x=x-1;
else if(right < up && right < left) x= x+1;
seam[y-1]=x;
}
return seam;
}
floatimage 公共最终类 FloatImage 扩展 JFrame{
private final int width;
private final int height;
private final float[] data;
public FloatImage(int width, int height) {
this.width = width;
this.height = height;
this.data = new float[width*height];
}
public int getWidth() {
return width;
}
public int getHeight() {
return height;
}
public float get(final int x, final int y) {
if(x < 0 || x >= width) throw new IllegalArgumentException("x: " + x);
if(y < 0 || y >= height) throw new IllegalArgumentException("y: " + y);
return data[x+y*width];
}
public void set(final int x, final int y, float value) {
if(x < 0 || x >= width) throw new IllegalArgumentException("x: " + x);
if(y < 0 || y >= height) throw new IllegalArgumentException("y: " + y);
data[x+y*width] = value;
}
public static FloatImage createSameSize(final BufferedImage sample) {
return new FloatImage(sample.getWidth(), sample.getHeight());
}
public static FloatImage createSameSize(final FloatImage sample) {
return new FloatImage(sample.getWidth(), sample.getHeight());
}
public static FloatImage fromBufferedImage(final BufferedImage src) {
final int width = src.getWidth();
final int height = src.getHeight();
final FloatImage result = new FloatImage(width, height);
for(int x = 0; x < width; x++) {
for(int y = 0; y < height; y++) {
final int argb = src.getRGB(x, y);
int r = (argb >>> 16) & 0xFF;
int g = (argb >>> 8) & 0xFF;
int b = argb & 0xFF;
result.set(x,y, (r*0.3f+g*0.59f+b*0.11f)/255);
}
}
return result;
}
public BufferedImage toBufferedImage(float scale) {
final BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
for(int x = 0; x < width; x++) {
for(int y = 0; y < height; y++) {
final int intensity = ((int) (get(x, y) * scale)) & 0xFF;
result.setRGB(x,y,0xFF000000 | intensity | intensity << 8 | intensity << 16);
}
}
return result;
}
}
